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。
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.SEMEDS,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).
作者
曾涛涛
农海杜
沙海超
陈胜兵
张晓玲
刘金香
ZENG Taotao;NONG Haidu;SHA Haichao;CHEN Shengbing;ZHANG Xiaoling;LIU Jinxiang(Hunan Province Key Laboratory of Pollution Control and Resource Reuse Technology,University of South China,Hengyang 421001,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2023年第2期1037-1049,共13页
Acta Materiae Compositae Sinica
基金
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)。
关键词
污泥基生物炭
纳米零价铁
Cr(Ⅵ)
吸附量
机制
还原
sludge-derived biochar
nanoscale zero-valent iron
Cr(Ⅵ)
adsorption capacity
mechanism
reduction
