造纸污泥制备功能吸附材料及其对Cu~(2+)吸附性能的研究

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英文篇名：Study on the preparation of functional adsorption material from paper sludge and its adsorption properties for Cu~(2+) 作者：戴财胜 ; 张玉东 英文作者：DAI Caisheng;ZHANG Yudong.;School of Chemistry and Chemical Engineering,Hunan University of Science and Technology; 关键词：造纸污泥 ; 生物炭 ; 功能吸附材料 ; 吸附 英文关键词：paper sludge;;biochar;;functional adsorption material;;adsorption 中文刊名：HJWR 英文刊名：Environmental Pollution & Control 机构：湖南科技大学化学化工学院; 出版日期：2019-06-15 出版单位：环境污染与防治 年：2019 期：v.41;No.319 基金：国家自然科学基金资助项目(No.51478182) 语种：中文; 页：HJWR201906001 页数：6 CN：06 ISSN：33-1084/X 分类号：4-8+13

摘要

以造纸污泥为原料,利用热解的方法制备生物炭,然后用氢氧化钠对其改性,得到功能吸附材料(SAM),探讨了SAM对Cu~(2+)的吸附性能及其影响因素。采用扫描电镜(SEM)、红外光谱等手段揭示了SAM吸附Cu~(2+)的机理。结果表明:造纸污泥在300℃热解2h,然后用5mol/L的氢氧化钠改性,可制备得到对重金属具有良好吸附性能的SAM;当100mg/L的Cu~(2+)模拟废水的pH为6～7时,SAM投加量为0.010 0g/mL下Cu~(2+)去除率为99.15%,SAM投加量为0.002 5g/mL下SAM的吸附量为28.788mg/g;SAM吸附Cu~(2+)符合Langmuir吸附等温模型,属于单分子层吸附,其吸附机理主要表现为化学吸附,即SAM中含有丰富的羟基官能团,Cu~(2+)能与羟基形成稳定的络合物,通过化学键固定在SAM的表面及孔内,从而达到去除模拟废水中Cu~(2+)的效果。
        Using paper sludge as raw material,biochar was prepared by pyrolysis method,and then modified with NaOH to obtain functional adsorption material(SAM).The adsorption performance and influencing factors of SAM on Cu~(2+)were discussed.The mechanism of SAM adsorption on Cu~(2+)was revealed by means of SEM and infrared spectroscopy.The results showed that the paper sludge was pyrolyzed at 300℃for 2h,and then modified with 5mol/L NaOH to prepare SAM with good adsorption performance for heavy metals.When the pH of 100mg/L Cu~(2+)simulated wastewate was 6-7,the dosage of SAM was 0.010 0g/mL,the removal rate of Cu~(2+)was 99.15%,the dosage of SAM was 0.002 5g/mL,the adsorption capacity of SAM was 28.788mg/g;the adsorption of Cu~(2+)by SAM conformed to the Langmuir equation and belonged to monolayer adsorption,the adsorption mechanism was mainly characterized by chemical adsorption,SAM was rich in hydroxyl functional groups,Cu~(2+)could form a stable complex with hydroxyl groups,and was fixed on the surface and pores of SAM by chemical bonds,thereby achieving the effect of removing Cu~(2+)in simulated wastewater.

引文

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