通讯机构：
[Yanfang Xia; Min Liu; Yanfang Xia Yanfang Xia Yanfang Xia; Min Liu Min Liu Min Liu] C;College of Nuclear Science and Technology, University of South China, Hengyang, 421001 China<&wdkj&>Zhuhai Tsinghua University Research Institute Innovation Center, 101 University Ave, Tangjiawan, Zhuhai, 519000 China<&wdkj&>College of Nuclear Science and Technology, University of South China, Hengyang, 421001 China
摘要：
In this article, REFe0.5Cr0.5O3 (RE = La, Y) is prepared by sol–gel method, and the structure is characterized and analyzed by X‐ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, Mössbauer spectroscopy, and magnetism. A reference for future studies of the effect of clusters on Cr‐doped iron‐based calcium is provided. The synthesis of REFe0.5Cr0.5O3 (RE = La, Y) using the sol–gel method is focused and their structural differences are investigated. The results of X‐ray diffraction show that the change of ion radius at position A leads to varying degrees of octahedral distortion and spatial group structure. The scanning electron microscopy analysis reveals micron‐level particles with clear boundaries, while energy‐dispersive X‐ray spectroscopy and room temperature Mössbauer spectra indicate the presence of Fe/Cr clusters in the sample and the transitional valence of iron. Disorder in the B position leads to a saturation moment that is lower than the theoretical value. The thermomagnetic profile shows a reversal of magnetization due to the interaction between the single‐ion magnetic anisotropy and the antisymmetric Dzyaloshinskii–Moriya (DM) interaction, with a broader peak is observed due to cluster formation. The difference in negative magnetic field is due to the difference in net magnetic moment caused by different DM intensities.
作者：
Hamza, Mohammed F.;Guibal, Eric;Wei, Yuezhou;Fouda, Amr;Althumayri, Khalid;...
期刊：
Journal of Water Process Engineering,2023年54:103928 ISSN：2214-7144
通讯作者：
Wei, YZ;Guibal, E
作者机构：
[Wei, Yuezhou; Hamza, Mohammed F.] Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.;[Abu Khoziem, Hanaa A.; Hamza, Mohammed F.] Nucl Mat Author, POB 530, Cairo, Egypt.;[Guibal, Eric; Guibal, E] IMT Mines Ales, Polymers Compos & Hybrids PCH, Ales, France.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.;[Fouda, Amr] Al Azhar Univ, Fac Sci, Bot & Microbiol Dept, Cairo 11884, Egypt.
通讯机构：
[Wei, YZ ] U;[Guibal, E ] I;Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.;IMT Mines Ales, Polymers Compos & Hybrids PCH, Ales, France.;Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.
关键词：
Cadmium(II) sorption;Uptake kinetics;Sorbent recycling;Sulfur derivative of gellan gum;TBP-functionalization;Selective separation
摘要：
Two sorbents are successfully synthesized based on the chemical modification of gellan gum (GG). First, thiosemicarbazide is grafted onto GG to produce GEG-C. In a second step, GEG-C is functionalized with a derivative of tributyl phosphate (dTBP, giving GEG-P sorbent). The sorption properties are compared for recovery of Cd(II) from aqueous solutions. GEG-C is expected to bind Cd(II) through carboxylic, amine, and thiocarbonyl groups, while phosphate groups in GEG-P contribute to increase metal sorption. The chemical modification improves not only the uptake kinetics (equilibrium time & AP;30 min, vs. 45 min) but also the sorption capacities (& AP;2.79 vs. 1.60 mmol Cd g-1), at optimum pH (i.e., pH 5). The functionalization also improves (a) the sorbent stability (weaker reduction of the loss in sorption efficiency after five cycles of reuse compared with GEG-C) and (b) the sorption selectivity in the presence of competitor ions (from equimolar multicomponent solutions), especially at pH 4. Different sorption mechanisms may be involved depending on the pH (deprotonation of reactive groups) including chelation (onto deprotonated amine and phosphonate groups) and ion exchange (protonated groups with metal cations). Cadmium sorption is reversed by contact with 0.3 M HCl solution. The functionalization (GEG-P) strongly increases the selectivity coefficient for Cd(II) against major elements in mining effluent, especially at pH higher than 5. These results confirm the interest of multifunctionality in the development of new sorbents based on renewable resources (such as gellan gum).
摘要：
We employ a real-space grids technique to calculate positron annihilation lifetimes with pseudopotentials. This method is based on the two-component of density functional theory (TCDFT), the Hamiltonian operator of the Kohn-Sham equation is discretized on a point grid by the finite difference method (FDM), the positron eigenstates are searched by the conjugate-gradient method (CG) and the positron Kohn-Sham equation is solved by a self-consistent iteration method. We show that the numerical results under this scheme for bulk and monovacancy of positron annihilation lifetimes are in reasonable agreement with the available experimental data. Further-more, all the results of our calculations demonstrate the accuracy and efficiency of the method from different aspects.
期刊：
Surface and Coatings Technology,2023年459:129411 ISSN：0257-8972
通讯作者：
Youbin Wang
作者机构：
[Feng, Jiqiang; Wang, Youbin; Lin, Xueliang] Guangxi Univ, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life Cycle Safety, Nanning 530004, Peoples R China.;[Feng, Jiqiang; Wang, Youbin; Lin, Xueliang] Guangxi Univ, Educ Dept Guangxi Zhuang Autonomous Reg, Key Lab High Performance Struct Mat & Thermo Surfa, Nanning 530004, Peoples R China.;[Bian, Meihua] Elect Power Res Inst Guangxi Power Grid Co Ltd, Nanning 530004, Peoples R China.;[Wei, Yuezhou] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wang, Youbin] Guangxi Univ, State Key Lab Featured Met Mat & Life cycle Safety, Nanning 530004, Peoples R China.
通讯机构：
[Youbin Wang] S;State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China<&wdkj&>Key Laboratory of High Performance Structural Materials and Thermo-surface Processing (Guangxi University), Education Department of Guangxi Zhuang Autonomous Region, Nanning 530004, PR China
摘要：
The trivalent chromium conversion coating (CCC) is prepared on pure zinc, and the corrosion resistance of trivalent CCC is characterized by scanning electron microscopy (SEM), polarization curves and electrochemical impedance spectroscopy (EIS). The local corrosion and self-healing behavior of trivalent CCC at the initial stage of immersion corrosion are investigated in situ by scanning electrochemical microscopy (SECM). The results show that trivalent CCC has higher impedance value and lower corrosion current density as compared to pure zinc, and the coating has excellent corrosion protection for pure zinc. At the initial stage of corrosion (0-12h), the SECM feedback current of the trivalent CCC does not change significantly; after immersed for 24 h, the local current rises from 0.83 to 0.95, which can be explained that the trivalent CCC cracks locally and occurs local corrosion. In situ analysis of oxygen concentration at the scratch of trivalent CCC indicates that the addition of polyaniline can inhibit the oxygen reduction reaction, which hinders the corrosion process and improves the self-healing ability of trivalent CCC.
摘要：
To efficiently separate strontium (Sr) from simulated high level liquid waste (HLLW), a novel acid-resistant inorganic-organic hybrid adsorbent, named as HEMAP/SiO2-P, was prepared by loading 2-hydroxyethyl-2-methyl-2-propenoate phosphate (HEMAP) into styrene-divinylbenzene modified silica (SiO2-P) with vacuum impregnation method. The experimental results showed that the adsorbent exhibited good adsorption selectivity with the SFSr/metal ions over 64.2 in 3 M HNO3 simulated HLLW. In addition, the adsorption of Sr by the adsorbent was in accordance with the pseudo-second-order kinetic model and the Langmuir isotherm model, and the adsorption equilibrium was obtained within 1 min with the saturation adsorption capacity of 61.2 mg/g. The adsorption of Sr was not markedly changed with increasing temperature. Furthermore, the results of adsorption experiments, characterization analysis, extraction experiments and density functional theory (DFT) calculations revealed that two organic ligand molecules were coordinated with one Sr molecule and simultaneously involved two nitrate molecules to maintain the charge balance during the adsorption process.
作者机构：
[Liu, Longcheng; Meng, Shuo] Univ South China, R&D & Modelling Ctr Treatment& Disposal Radioact W, Hengyang 421001, Peoples R China.;[Liu, Longcheng; Meng, Shuo] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Liu, Longcheng] Beijing Res Inst Chem Engn & Met, Beijing 101149, Peoples R China.;[Liu, Longcheng] KTH Royal Inst Technol, Dept Chem Engn, S-10044 Stockholm, Sweden.
关键词：
Variant Time Domain Random Walk algorithms;Boundary conditions;Statistical interpretation;Convolution;Cumulative distribution function
摘要：
In this work, three variant Time Domain Random Walk (TDRW) algorithms were developed for the problem of solute transport in a single fracture-matrix system, where an arbitrary inlet boundary condition can be applied. One approach performs an additional evaluation of integral in terms of injection boundary and the solution to a Dirac delta case. One method makes use of two functions, dependent on specific boundary conditions, to estimate the particle arrival time. The other additionally introduces the concept of solute injection time, resulting from the injection boundary, into the calculation of particle arrival time. To validate the developed variant algorithms, two benchmark cases are considered with respect to a general Dirichlet injection mode and a Robin injection boundary, respectively. The results from three approaches all make a good agreement with those of inverse Laplace transform method. However, the Monte Carlo nature of the TDRW algorithm implies that the accuracy of the computational result is highly dependent on the number of particles applied in the simulation.
摘要：
In response to the lack of plasma bag-breaking equipment and time-consuming manual recovery of plasma in China, this study focuses on the distal end cutting of a plasma bag residual-input tube and designs a machine-vision-based plasma bag residual-input tube cutting system. The system comprises a plasma bag rotation device, a bottom disc, an image acquisition device, a cutting device, and a device control system. The image acquisition device captures images of the rotating plasma bag and calculates the Euclidean distance from the end of the plasma bag input-tube distal end to the outer edge of the bottom support plate and the distance from the input-tube distal end to the centerline of the plasma bag. Two distinct value acquisition algorithms are designed for the two types of input tubes. The screw slide moves accordingly. When the plasma bag is above the cutting part, the cutting part cuts the end of the residual-input tube of the plasma bag. The prototype performance tests reveal that the cutting error is within 10% of the end of the plasma bag input tube distal end, the cutting success rate is 100%, and the processing time for each bag is 2.5 s, which meets the time requirements of the plasma bag breaker.
作者机构：
[Wang, Xinpeng; Lin, Zheyang; Chen, Yuliang; Fu, Hao; Ma, Guangcan] Guangxi Univ, Sch Resources Environm & Mat, 100 Daxue East Rd, Nanning 530004, Peoples R China.;[Yin, Xiangbiao] Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.;[Fu, Hao] Guangxi Univ, Sch Chem & Chem Engn, Nanning 530004, Peoples R China.;[Chen, Fangqiang; Wang, Qingsong] MEE, Nucl & Radiat Safety Ctr, 9 East Zhixing Rd, Beijing 102400, Peoples R China.
通讯机构：
[Fangqiang Chen; Xinpeng Wang] A;Authors to whom correspondence should be addressed.<&wdkj&>School of Resources, Environment and Materials, Guangxi University, 100 Daxue East Road, Nanning 530004, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>Nuclear and Radiation Safety Center, MEE, 9 East Zhixing Road, Beijing 102400, China
摘要：
Strontium, the main component of radioactive nuclear wastewater, is characterized by a high fission yield and an extended half-life. It is easily absorbed by the human body, thus greatly threatening the environment and the human body. In this study, a mesoporous composite phase sodium superionic conductor (NVP@NMP) was synthesized by the droplet template method, and the rapid capture of Sr2+ from wastewater was achieved by constructing a nano-heterogeneous interface to increase the ion diffusion rate. NVP@NMP showed efficient and rapid removal of strontium ions in adsorption kinetics, isothermal adsorption, solution pH, and interfering ions concentration tests, especially using the equilibrium time of 2 min for strontium absorption by NVP@NMP and a maximum theoretical adsorption capacity of 361.36 mg/g. The adsorption process was spontaneous, endothermic, and feasible. At higher concentrations of other competing ions (Na, K, Ca, Mg, and Cs), the adsorbent exhibited higher selectivity towards Sr2+.TEM, XPS, and XRD analyses revealed that ion exchange was the main mechanism for the NVP@NMP ultrafast adsorption of Sr2+. In this research, we investigated the feasibility of ultrafast strontium capture by sodium superionic conductor structured phosphates and explained the ultrafast strontium adsorption mechanism of NASICON materials through XPS.
摘要：
In this study, based on Wentzel-Kramers-Brillouin theory, we systematically investigate the cluster radioactivity half-lives of 22 nuclei ranging from to using a phenomenological model that considers the Fr-221 Cm-242 screened electrostatic effect of the Coulomb potential. In this model, there are two adjustable parameters, t and g, which are related to the screened electrostatic barrier and the strength of the spectroscopic factor, respectively. The calculated results indicate that this model can effectively reproduce the experimental data, with a corresponding root mean-square deviation of 0.660. In addition, we extend this model to predict the half-lives of possible cluster radioactive candidates whose cluster radioactivities are energetically allowed or observed but not yet quantified in the evaluated nuclear properties table NUBASE2020. The predicted results are consistent with those obtained using other theoretical models and/or empirical formulas, including the universal decay law proposed by Qi et al. [Phys. Rev. C 80, 044326 (2009)], a semi-empirical model for both a decay and cluster radioactivity proposed by Santhosh et al. [J. Phys. G 35, 085102 (2008)], and a unified formula for the half-lives of a decay and cluster radioactivity proposed by Ni et al. [Phys. Rev. C 78, 044310 (2008)].
期刊：
Journal of Instrumentation,2023年18(4):P04006 ISSN：1748-0221
通讯作者：
Tang, Q;Zhang, YP
作者机构：
[Li, Chi; Tang, Quan; Liu, Yu; Xu, Zhongfang; Guan, Tingyu; Tang, Q] Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.;[Liu, Jincang; Zhang, Peng; Yang, Changgen; Zhang, YP; Zhang, Yongpeng; Guo, Cong] Chinese Acad Sci, Inst High Energy Phys, Expt Phys Div, Beijing, Peoples R China.;[Liu, Jincang; Zhang, Peng; Yang, Changgen; Zhang, YP; Zhang, Yongpeng; Guo, Cong] Univ Chinese Acad Sci, Sch Phys, Beijing, Peoples R China.;[Liu, Jincang; Zhang, Peng; Yang, Changgen; Zhang, YP; Zhang, Yongpeng; Guo, Cong] State Key Lab Particle Detect & Elect, Beijing, Peoples R China.
通讯机构：
[Zhang, YP ] C;[Tang, Q ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.;Chinese Acad Sci, Inst High Energy Phys, Expt Phys Div, Beijing, Peoples R China.;Univ Chinese Acad Sci, Sch Phys, Beijing, Peoples R China.
关键词：
Photon detectors for UV;visible and IR photons (solid-state) (PIN diodes;APDs;Si-PMTs;G-APDs;CCDs;EBCCDs;EMCCDs;CMOS imagers;etc);Very low-energy charged particle detectors
摘要：
Radon and its daughters are one of the most important background sources for low -background liquid scintillator (LS) detectors. The study of the diffusion behavior of radon in the LS contributes to the analysis of the related background caused by radon. Methodologies and devices for measuring radon's diffusion coefficient and solubility in materials are developed and described. The radon diffusion coefficient in the LS was measured for the first time and the solubility coefficient was also obtained. In addition, the radon diffusion coefficient in the polyolefine film which is consistent with data in the literature was measured to verify the reliability of the diffusion device.
期刊：
Journal of the Korean Physical Society,2023年83(1):25-30 ISSN：0374-4884
通讯作者：
Muhammad Abdul Wasaye<&wdkj&>Tao Yu
作者机构：
[Wasaye, Muhammad Abdul; Ni, Zining; Yu, Tao] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Muhammad Abdul Wasaye; Tao Yu] S;School of Nuclear Science and Technology, University of South China, Hengyang, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang, China
关键词：
Multiple scattering;Random walk;Differential cross-section;Angular distribution;ELSEPA;Monte Carlo
摘要：
A new method based on random walk theory to model multiple elastic scattering of electrons is presented which gives the efficient convergence of scattering series. This method modelled the multiple scattering as a series of random walks on a unit sphere, with each scattering event equivalent to one step in the random walk sequence. The step size of the random walk is characterised by the scattering angle which is determined by the scattering differential cross-section. Dirac partial wave program ELSEPA has been used to calculate the differential cross-sections of electrons and positrons by neutral atoms. The position distribution of a point on this unit sphere after “n” steps of random walk yields the angular distribution of multiple scattering. The main advantage of this method is the faster convergence of the scattering series for small step size, which is the most computationally demanding scenario in Monte Carlo multiple scattering simulations in the radiation transport code. Equivalence to Goudsmit–Saunderson’s theory of multiple scattering is also demonstrated and the angular distributions obtained from both the random walk method and Goudsmit–Saunderson’s theory are compared. The convergence of the scattering series is checked by comparing the Legendre polynomial expansion coefficients obtained through the random walk method and Goudsmit–Saunderson’s theory. Comparisons showed that the scattering series converges very fast for smaller path lengths (< 50
$$\times $$
mean free paths).
作者机构：
[Contreras, Miguel Angel Martin] Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.;[Vega, Alfredo] 28 Changsheng West Rd, Hengyang, Hunan, Peoples R China.;[Vega, Alfredo] Univ Valparaiso, Inst Fis & Astron, A Gran Bretana 1111, Valparaiso, Chile.
通讯机构：
[Contreras, MAM ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.
摘要：
In the context of bottom-up AdS/QCD models, we discuss how the configurational entropy can describe heavy non-qq over bar states. Using the nonquadratic softwall model, introduced to describe nonlinear Regge trajectories, we parametrize different multiquark and exotic meson structures to describe Z,, psi, and Zb states as non-qq over bar hadrons in terms of stability. We found that Z, is better described as a hybrid meson with one gluon tube, psi as hadrocharmonium, and Zb as hadronic molecule.
作者机构：
[Liu, Guan-Nan; Li, Xin-Xia; Li, XX] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Liu, Hong-Bo] Hengyang Normal Univ, Sch Phys & Elect Engn, Hengyang 421001, Peoples R China.;[Sun, Ai-Ping; Sun, AP] Southwestern Inst Phys, Chengdu 610041, Peoples R China.
通讯机构：
[Sun, AP ] S;[Li, XX ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Southwestern Inst Phys, Chengdu 610041, Peoples R China.
关键词：
tokamaks;helicon wave;lower hybrid wave;synergy current drive
摘要：
Non -inductive current drive plays a crucial role in tokamak, especially for its steady state operations. Recently, the helicon wave (HW) has been regarded as a promising tool for driving off -axis plasma current in reactor -grade machine. The lower -hybrid wave (LHW) is the most effective radio -frequency current drive method, however, it has the drawback, which is limited by the conditions of wave accessibility in the high parameter tokamak, making the wave power usually damped at the plasma edge. HW can spiral towards the plasma centre directly under a high electron density. To obtain a long pulse steady state operation of reactor tokamak, the complementarity of HW and LHW in the aspect of driven current distribution in the high parameter tokamak is considered. The synergy current drive of the HW and the LHW is studied numerically in the steady-state scenario of HL -2M. According to the fast wave dispersion relation of plasma, the HW parameters, including its wave frequency and launched parallel refractive index, are obtained firstly. Results of GENRAY code simulation show that a single pass wave power absorption of the HW can be obtained generally through the electron Landau damping and transit time magnetic pumping effects. On the other hand, the LHW parameters are adopted from the equipped system on the machine. Results of single pass wave absorption are also obtained in the case of LHW. And then, the synergy effects of HW and LHW are studied numerically based on the GENRAY/CQL3D models. The cooperation of these two waves results in a broad plasma current distribution along the radial direction ( = 0.2-0.9) in the machine. Taking the electron distribution functions of these waves into account, it is clear that the electrons are accelerated by the HW in the parallel magnetic field direction, resulting in more electrons entering the region of LHW resonance area. As the consequence, a net plasma current appears. Furthermore, a fine-grained parametric scan is performed by changing the launched parallel refractive index of HW, and the results indicate that positive synergy effects can be generally observed once the related wave current drive profiles are overlapped. Finally, the synergy factor is shown to be proportional to this overlap and reaches its maximum value of 1.18 in HL -2M.
摘要：
MgxNi1-xFe2O4 (x = 0, 0.25, 0.5, 0.75, 1) spinel ferrite material was analyzed to determine its magnetic properties and structure. X-ray diffraction (XRD), Mossbauer spectroscopy, and vibrating sample magnetometer (VSM) characterization were performed on the samples prepared using the sol-gel method. The results from XRD confirmed the existence of the single-phase cubic spinel structures Fd (3) over barm, as well as the evolution of the crystalline size (D), the lattice parameter (a) and cell volume in compounds. The Mossbauer spectra showed the distribution of cations and changes in the magnetic properties of the sample. VSM measurement revealed that the samples were room-temperature ferromagnetic. Moreover, the saturation magnetization (M-s) of the samples changed with the Mg2+ ion content x, and a maximum occured at x = 0.5. Doping with Mg2+ ions increased the transfer of Ni2+ ions to tetrahedral sites, thus increasing the magnetic moment difference between tetrahedral (A) and octahedral (B) sites. Specifically, doping NiFe2O4 with Mg2+ ions can enhance its magnetic properties and enhance its saturation magnetization.
通讯机构：
[Yue, CT ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
Poly(vinylphosphonic acid);POSS;Limited swelling capacity;Bath and column modes;Uranium (VI) removal
摘要：
Organophosphorus acid polymers with high hydrophilicity and limited swelling capacity have great application potential in disposal of uranium (VI)-containing wastewater due to its high uranium (VI) adsorption efficiency. In this work, POSS-crosslinked poly(vinylphosphonic acid) polymer is synthesized via copolymerization of octa-vinyloctasilasesquioxane and vinylphosphonic acid for uranium (VI) adsorptive removal from solution. The polymer has a high hydrophilicity and limited swelling capacity. The uranium (VI) adsorptive removal is per-formed in batch mode and the effects of polymer dosage, pH and ionic strength are investigated. The polymer shows high removal efficiency for uranium (VI) from a 120 mg L-1 solution and can achieve the complete uranium (VI) removal at 30 degrees C and pH 4.0 with 0.33 g L-1 polymer. The adsorption process is analyzed by comparison with the adsorption kinetic and isotherm models. Uranium (VI) adsorption on this polymer is found to be more consistent with the pseudo-second-order and Langmuir models, and the maximum adsorption ca-pacity attains 714 mg g- 1. Competitive adsorption between uranium (VI) and other metal ions on polymer is performed to analyse the adsorption selectivity. The polymer attains a 20 L g- 1 uranium (VI) distribution co-efficient, higher than other metal ions (0.1-1.8 L g-1). The polymer can be easily recycled for at least five times with removal efficiency above 99% and the polymer can be well applied for dynamic adsorptive removal of uranium (VI) from uranium-containing solution (5 mg L-1) in a fixed-bed column with removal efficiency above 99%. The excellent uranium (VI) removal performances of this composite polymer highlight its great potential in the disposal of uranium-containing nuclear wastewater.
摘要：
Wastewater disposal from beryllium production has become a significant problem in the industry. Therefore, this paper designed porous calcium carbonate biochar (CC-LBC) using Na2CO3 and CaCl2 to modify the biochar innovatively, after which we understudied the Be(II) adsorption effect of CC-LBC at different concentrations. The results from Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), and other characterization analyses showed that when CC-LBC particles were immersed in the Be(II) waste liquid, several O elements accumulated because of its loose and porous structure, generating more beryllium precipitates on the surface of the adsorbent. According to kinetic data fitting, in-vestigations also revealed that both physical and chemical reactions controlled CC-LBC/Be(II) adsorption pro-cess, indicating that the CC-LBC/Be(II) adsorption system is suitable for the intraparticle diffusion model. Furthermore, when the beryllium on activated carbon was desorbed by 10% NaOH, the desorption effect was above 80%, and the saturation adsorption capacity of CC-LBC for Be(II) was up to 55 mg/g. However, when the initial concentration of Be(II) was equal to 0.5-1 mg/L, the concentration of beryllium after treatment was lower than 10 & mu;g/L, confirming that CC-LBC had a better selective adsorption performance for beryllium in the binary system.
