期刊：
FRONTIERS IN CHEMISTRY,2022年10:835959 ISSN：2296-2646
通讯作者：
Wu, Xiaoyan;Liu, Y;Wu, XY
作者机构：
[Yu, Shoufu; Li, Mi; Zhang, Qiucai; Lv, Chunxue; Wu, Xiaoyan; Shi, Keyou; Ye, Jian; Zhang, Xiaowen; Liu, Yong; Xie, Wenjie] Univ South China, Hengyang, Peoples R China.;[Li, Mi; Wu, Xiaoyan; Ye, Jian; Zhang, Xiaowen] Univ South China, Hengyang Key Lab Soil Contaminat Control & Remedi, Hengyang, Peoples R China.;[Li, Mi; Wu, Xiaoyan; Ye, Jian; Zhang, Xiaowen] Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang, Peoples R China.;[Zhang, Qiucai; Liu, Yong] Univ South China, Decommissioning Engn Technol Res Ctr Hunan Prov U, Hengyang, Peoples R China.
通讯机构：
[Liu, Y ; Wu, XY; Wu, XY ] U;Univ South China, Hengyang, Peoples R China.;Univ South China, Hengyang Key Lab Soil Contaminat Control & Remedi, Hengyang, Peoples R China.;Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang, Peoples R China.;Univ South China, Decommissioning Engn Technol Res Ctr Hunan Prov U, Hengyang, Peoples R China.
作者机构：
[Qin, Ya-guang] Power China Huadong Engn Corp Ltd, Hangzhou 311122, Peoples R China.;[Gu, De-sheng; Yang, Dong-jie; Qin, Ya-guang; Feng, Chun-di; Ma, Shao-wei; Hu, Jian-hua] Cent South Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.;[Bai, Xin] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421000, Peoples R China.
关键词：
grain deformation;in situ XCT;failure behavior;Stokes rotation;material line
摘要：
This work aimed to quantify the physical and mechanical behavior of three-dimensional microstructures in rocks under uniaxial compression. A high-precision in situ XCT (X-ray transmission computed tomography) technology was applied to investigating the behavior of mineral grains in sandstone: the movement, the rotation deformation, and the principal strains between fault zone and non-fault zone. The results indicate that after unloading, the shear strain of mineral grains is periodic in the radial direction, the strain of mineral grains in the fracture zone is about 30 times of the macro strain of the specimen, which is about 5 times in the non-fracture zone, and the shear strain near the fault zone is larger than the compressive strain, and there is the shear stress concentration feature.
通讯机构：
[Dr. Kun Liu; Dr. Cen Zhang; Prof. Congshan Zhou] C;College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, Hunan, 414000 P. R. China
摘要：
<jats:title>Abstract</jats:title><jats:p>A novel 2,2′‐bipyridine‐based gemini sulfonic ionic liquid was first synthesized and then immobilized on MCM‐41 support (named IL1/MCM‐41), which was further characterized using XRD, FT‐IR, SEM, TEM, N<jats:sub>2</jats:sub>‐physisorption, XPS and TG techniques. These characterization results revealed that the IL1/MCM‐41 presented a whole ordered mesoporous structure, excellent thermal stability as well as the interaction between ionic liquid with MCM‐41. Catalytic activity of the obtained IL1/MCM‐41 was systematically evaluated for the Doebner‐Von Miller reaction to generate quinoline. Compared to conventional imidazole‐type single sulfonic ionic liquid supported on MCM‐41 (named IL2/MCM‐41), IL1/MCM‐41 exhibited higher catalytic activity and better reusability, which was probably due to the synergistic catalytic effect of the dual sulfonic acid group on IL2 and the stronger interaction between dipyridine ring of ionic liquid with MCM‐41 support, respectively. Meanwhile, a plausible reaction routes for the synergistic catalytic action of dual sulfonic acid to quinoline over the IL1/MCM‐41 catalyst was also proposed in this paper.</jats:p>
作者机构：
[Hua, Yilong; Yang, Jianping] Donghua Univ, Coll Mat Sci & Engn, Shanghai 200051, Peoples R China.;[Hua, Yilong; Li, Donghan] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Zhang, Wei-xian; Wang, Wei; Li, Ruofan; Gu, Tianhang] Tongji Univ, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China.;[Zhang, Wei-xian] South China Agr Univ, Guangdong Lab Lingnan Modern Agr, Guangzhou 510642, Peoples R China.
通讯机构：
[Yang, J.] C;[Zhang, W.-X.] S;College of Materials Science and Engineering, China;State Key Laboratory of Pollution Control and Resource Reuse, China
作者机构：
[Shu, Yangzhen; Peng, Guowen] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Xiao, Fangzhu; Cheng, Conghui; Guo, Kexin; Chen, Luoyao; Li, Shanshan] Univ South China, Sch Publ Hlth, Hengyang 421001, Hunan, Peoples R China.;[Xie, Jingxi; Peng, Guowen] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Peng, G.; Xiao, F.] S;School of Environmental Protection and Safety Engineering of University of South ChinaChina;School of Public Health, China
摘要：
Iron-based materials have attracted much attention in water treatment because of excellent ability to treat pollutants. In this study, self-made iron-carbon micro-electrolysis packing (IMP) was introduced to treat uranium-bearing wastewater (UBW). The effects of the IMP dosage, initial pH of solution and initial U(VI) concentration was investigated. The comparison of material adsorption performance and repeated desorption experiments were also accomplished under the optimum conditions. The mechanism of treating UBW by IMP was revealed by studying the change of IMP's surface properties characterized before and after adsorption by Scanning Electron Microscope (SEM), Energy-Dispersive X-ray Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS) and Mossbauer spectra (MS). Research results demonstrated that IMP is suitable for the treatment of UBW with low concentration at acid condition (pH < 5). SEM results indicated that uranium was deposited on the surface of IMP in the form of tidy fine particles. The most important reason for uranium removal was determined as the reduction of soluble U(VI) to insoluble U(IV) by IMP. The advantages of IMP for UBW treatment were verified with rapidity, high efficiency, and durability. Therefore, IMP could be considered as a positive material for uranium removal from UBW.
摘要：
<jats:p> Goethite is a stable and widespread mineral present in soil with many uses, and it affects the transportation and immobilization of heavy metals in solution. Nanogoethite was synthesized by a chemical precipitation method and used to batch adsorb U(VI) in solution. Adsorption experiments were used to understand the role of nanogoethite in controlling the U(VI) adsorption behavior in soil. The morphology and the crystallinity of nanogoethite were characterized by scanning electron microscopy and wide-angle X-ray powder diffractometry, respectively. The results showed that the crystallinity of nanogoethite after the adsorption of uranium did not change, but small particles appeared on the surface of the scales. The surface area was determined from N<jats:sub>2</jats:sub> adsorption–desorption experiments using the Brunauer–Emmett–Teller to be 81.86 m<jats:sup>2</jats:sup>/g. The effects of factors such as the contact time, pH, adsorbent dosage, and the initial concentration of uranium on the adsorption of U(VI) were investigated. The experimental results showed that nanogoethite removed over 85% of the U(VI) in an aqueous 5.0 mg/L U(VI) solution at pH 4.0 and at 298 K. The pseudo-second-order model was used to simulate the adsorption process. The results show that chemisorption plays a major role in the adsorption process. The results of this study suggest that nanogoethite may play a significant role in controlling the migration and transfer of U(VI) in the soil, thus controlling the presence of U(VI) in soil. </jats:p>
摘要：
Uranium (U) contamination of soil has become a major concern with respect to its toxicity, accumulation in the food chain, and persistence in the environment. Anthropogenic activities like mining and processing of U ores has become pressing issues throughout the world. The aim of the work is to understand the chemical fractionation of U in polluted soil and the mechanism involved. U-free soils samples of eluvial (E), illuvial (B), and parent-material (C) horizons from a hydrometallurgical factory area were used. The experimental results showed that the U adsorption capacity decreased with depth, and its mobility in the upper soil is better than the lower. It was closely related to distribution coefficient (K-d), pH, organic-matter (OM), and carbonate content of soil horizons. The chemical fractionation of U was studied using the BCR sequential extraction scheme for soils after saturated adsorption. It was noted that the U reducible and oxidizable fraction in the E and B horizons can vertically transfer to the C horizon and occurs a significant rearrangement of U in different horizons. BET, SEM, XRD, and FT-IR analyses showed that different U distribution and migration in soil profile is mainly affected by specific surface area, soil particle size, mineral composition, and active groups. The XPS data further indicated that U (VI) is gradually converted to U (IV) with decreased depth and fixed in deeper soil becoming insoluble and immobile. It is the first step to investigate potential migration and plan U mining and milling area long-term management. (C) 2019 Published by Elsevier Ltd.
摘要：
In this paper, the developmental toxicity and apoptosis in zebrafish (Danio rerio) embryos induced by 0.01, 0.05, and 0.10-Gy gamma-ray irradiation were investigated and verified by single cell gel electrophoresis, acridine orange staining, flow cytometry, transmission electron microscopy, digital gene expression sequencing, and Western blot analysis. DNA damage, deformity rates, and apoptosis of zebrafish embryos were found to increase significantly with the increase of irradiation dose, and survival and hatching rates significantly decreased when the irradiation dose exceeds 0.10 and 0.05 Gy, respectively. Exposure to 0.10-Gy gamma-ray irradiation resulted in the swelling of cell mitochondria of zebrafish embryos and changes in their intracellular vacuoles. mRNA and protein expression levels of Shh (sonic hedgehog 19 KDa) and Smo (smoothened 86 KDa) of Hh signaling pathway associated with the development of early embryos significantly increased with the increase of irradiation dose. Expression of the AKT (56 KDa) and PiK3r3 (55 KDa) genes, which are anti-apoptotic and involved with the PI3K/Akt signaling pathway, significantly decreased, while expression of the bada gene, which is pro-apoptotic, significantly increased. The results show that gamma-ray irradiations of 0.01 and 0.05 Gy can induce developmental toxicity and apoptosis in zebrafish embryos via Hh and PI3K/Akt signaling pathways, respectively.
