| 污泥基生物炭负载纳米零价铁去除Cr(Ⅵ)的性能与机制 |
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| 引用本文： | 曾涛涛,农海杜,沙海超,陈胜兵,张晓玲,刘金香. 污泥基生物炭负载纳米零价铁去除Cr(Ⅵ)的性能与机制[J]. 复合材料学报, 2023, 40(2): 1037-1049. DOI: 10.13801/j.cnki.fhclxb.20220324.001 |
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| 作者姓名： | 曾涛涛 农海杜 沙海超 陈胜兵 张晓玲 刘金香 |
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| 作者单位： | 南华大学 污染控制与资源化技术湖南省高校重点实验室,衡阳 421001 |
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| 基金项目： | 国家自然科学基金(52170164);湖南省教育厅创新平台开放基金项目(19K081) |
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| 摘 要： | 针对电镀、冶金、印染等行业产生的含铬废水所导致的环境污染难题,以城市污泥热解获得的污泥基生物炭(SB)为载体,制备了污泥基生物炭负载纳米零价铁(nZVI-SB)材料用于去除水中的Cr(Ⅵ),探究了铁炭质量比、初始pH值、投加量、温度等因素对去除Cr(Ⅵ)的影响。通过SEM-EDS、XRD和XPS等手段对n ZVI-SB去除Cr(Ⅵ)的机制进行分析。结果表明：n ZVI-SB对Cr(Ⅵ)废水具有较好的去除能力。在投加量0.5 g/L、初始pH=2、温度40℃条件下,Fe与SB质量比为1∶1的nZVI-SB(1∶1)对Cr(Ⅵ)吸附量最大为150.60 mg/g。Cr(Ⅵ)去除过程可通过Langmuir吸附等温式与准二级动力学方程进行拟合。nZVI-SB对Cr(Ⅵ)去除机制主要包括吸附、还原和共沉淀。本文表明污泥基生物炭与纳米零价铁可以协同发挥除Cr(Ⅵ)作用。
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| 关 键 词： | 污泥基生物炭 纳米零价铁 Cr(Ⅵ) 吸附量 机制 还原 |
| 收稿时间： | 2022-01-10 |
Performance and mechanism of Cr(VI) removal by sludge-derived biochar loaded with nanoscale zero-valent iron |
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| Affiliation: | Hunan Province Key Laboratory of Pollution Control and Resource Reuse Technology, University of South China, Hengyang 421001, China |
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| Abstract: | Chromium-containing wastewater was generated in electroplating, metallurgy, printing and dyeing industries, which caused environmental pollution. The sludge-derived biochar (SB) was obtained from the pyrolysis of municipal sludge, and then loaded with nanoscale zero-valent iron (nZVI) to prepare sludge-derived biochar loaded with nanoscale zero-valent iron (nZVI-SB) for the removal of Cr(VI) from water. The effect of the iron to carbon mass ratio, initial pH value, dosage and temperature on the removal of Cr(VI) were explored. SEM-EDS, XRD and XPS were used to characterize the mechanisms of Cr(VI) removal. The results show that nZVI-SB has a desirable removal capacity for Cr(VI). Under the conditions of dosage 0.5 g/L, pH=2 and 40℃, the maximum adsorption capacity of Cr(VI) is 150.60 mg/g by nZVI-SB(1∶1) with a mass ratio of 1∶1 between Fe and SB. The Cr(VI) removal process can be fitted by Langmuir adsorption isotherm and pseudo-second-order kinetic equations. The removal mechanisms of Cr(VI) mainly include adsorption, reduction and co-precipitation. The present study confirms SB and nZVI can synergically remove Cr(VI). |
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