期刊论文

The efficiency and mechanism of U(Ⅵ) removal from acidic wastewater by sewage sludge-derived biochar

中文

化工学报

0438-1157

2020

71

5

2352-2362

10.11949/0438-1157.20191505

51408293:国家自然科学基金 11475080:国家自然科学基金 19K081:湖南省教育厅创新平台开放基金

本校为第一机构

通过城市污泥(SS)慢速热解制备污泥基生物炭(SSB),并研究初始pH、投加量、共存离子、吸附时间和温度等因素对SSB去除U(Ⅵ)的影响,探讨吸附动力学和吸附等温线特征.通过元素分析、扫描电镜(SEM)、傅里叶红外光谱(FTIR)、X射线衍射(XRD)和X射线光电子能谱(XPS)分析U(Ⅵ)吸附去除的机理.结果表明SSB去除U(Ⅵ)的适宜条件为:pH=3、投加量1 g/L、吸附时间240 min;在此条件下,在温度30℃时最大吸附量为34.51 mg/g.吸附动力学符合拟二级动力学模型;Langmuir吸附等温模型能更好描述生物炭对U(Ⅵ)的吸附行为.U(Ⅵ)吸附去除机理主要包括静电作用,与Si-O-Si的n-π相互作用,与羟基(-OH)、羧基(-COOH)的配位络...

Sewage sludge-derived biochar (SSB) was prepared by slow pyrolysis of sewage sludge (SS), and the effect factors, including initial pH, dosage, coexisting ions, contact time and temperature, on the U() adsorption by SSB were investigated. The adsorption kinetics and isotherm were also studied. The mechanism of U() adsorption removal was analyzed by elemental analysis, scanning electron microscopy (SEM), Fourier infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results showed that the suitable...