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

被引：0

作者：

Mo G. ^{[1
]}

Xie S. ^{[1
,2
]}

Zeng T. ^{[1
]}

Liu Y. ^{[1
]}

Cai P. ^{[1
]}

机构：

[1] Hunan Province Key Laboratory of Pollution Control and Resource Reuse Technology, University of South China, Hengyang, 421001, Hunan

[2] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, Hunan

来源：

Huagong Xuebao/CIESC Journal | 2020年 / 71卷 / 05期

关键词：

Adsorption; Mechanism; Pyrolysis; Remediation; Sewage sludge-derived biochar; U(Ⅵ)-containing wastewater;

D O I：

10.11949/0438-1157.20191505

中图分类号：

学科分类号：

摘要：

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(Ⅵ) adsorption by SSB were investigated. The adsorption kinetics and isotherm were also studied. The mechanism of U(Ⅵ) 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 conditions for U(Ⅵ) removal were pH of 3, dosage of 1 g/L and adsorption time of 240 min under 30℃. Under these conditions, a maximum adsorption capacity of 34.51 mg/g was obtained. The adsorption kinetics of U(Ⅵ) was accurately described by a pseudo-second-order model. Langmuir adsorption isotherm model can describe the adsorption behavior of U(Ⅵ) well. The adsorption mechanisms mainly include electrostatic interaction, n-π interaction of Si-O-Si, coordination complexation of hydroxyl (-OH) and carboxyl (-COOH) groups. Based on 5 adsorption-desorption cycles, the efficiencies of both U(Ⅵ) removal and SSB regeneration were above 80%. This study indicated that sewage sludge-derived biochar has the potential for acidic U(Ⅵ)-containing wastewater treatment. © All Right Reserved.

引用

页码：2352 / 2362

页数：10

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