重金属吸附剂巯基化核桃壳制备条件优化  

Optimization the Preparation Conditions of Sulfhydrated Walnut Shell as a Heavy Metal Adsorbent

作　　者：孙淏 张翠玲[1,2] 潘樟梓 尚志栋 贺懿琛 滕泽璟 SUN Hao;ZHANG Cui-ling;PAN Zhang-zi;SHANG Zhi-dong;HE Yi-chen;TENG Ze-jing(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Gansu Provincial Key Laboratory of Yellow River Water Environment,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]甘肃省黄河水环境重点实验室,甘肃兰州730070

出　　处：《化学试剂》2024年第6期63-70,共8页Chemical Reagents

基　　金：甘肃省科技计划项目(22CX3GA076);甘肃省教育厅产业支撑计划项目(2021CYZC-31);宁夏回族自治区自然科学基金项目(2023AAC03336)。

摘　　要：为提高核桃壳(WS)对重金属离子的吸附性能,利用L-半胱氨酸(L-Cys)对WS进行改性,得到巯基化核桃壳(CWS)。以CWS对Pb(Ⅱ)吸附量为评价指标,利用单因素试验、响应面试验逐步优化CWS制备条件,并借助场发射扫描电镜(SEM)、能谱仪(EDS)和傅里叶红外光谱仪(FT-IR)等表征方法探讨CWS的制备机理。结果表明:L-Cys和WS质量比是影响CWS吸附Pb(Ⅱ)性能的主要因素,温度影响次之,pH与温度之间存在显著的交互作用;CWS最优制备条件为m(L-Cys)∶m(WS)=1.58∶1、温度为63.2℃、pH 9.89、反应时间为4 h,最优条件下制备的CWS对Pb(Ⅱ)吸附量可达24.06 mg/g;CWS表面呈现许多凹陷、孔状结构丰富,CWS制备机理主要以发生酰胺化反应为主。研究显示,经巯基化核桃壳可用于Pb(Ⅱ)等重金属离子废水的处理。In order to improve the adsorption performance of walnut shell(WS)for heavy metal ions,WS was modified with L-cysteine(L-Cys)to obtain thiolated walnut shell(CWS).Taking the adsorption amount of Pb(Ⅱ)as the evaluation index,single factor experiments and response surface experiments were used to gradually optimize the preparation conditions of CWS,and the preparation mechanism of CWS was explored with the help of SEM,EDS,FT-IR and other characterization methods.The results showed that the mass ratio of L-Cys to WS was the main factor affecting the adsorption performance of CWS for Pb(Ⅱ),followed by temperature.There was a significant interaction between pH and temperature;the optimal condition of CWS was m(L-Cys)∶m(WS)=1.58∶1,the temperature was 63.2℃,the pH was 9.89,and the reaction time was 4 h.The adsorption capacity of CWS prepared under the optimal conditions for Pb(Ⅱ)could reach 24.06 mg/g;CWS surface presented many depressions and rich pore structures,and the preparation mechanism of CWS was mainly based on amidation reaction.Research showed that thiolated walnut shells could be used to treat heavy metal ion wastewater such as Pb(Ⅱ).

关 键 词：核桃壳 L-半胱氨酸 吸附 响应面 铅废水 

分 类 号：X703[环境科学与工程—环境工程]