直接巯基化石墨烯对汞吸附性能研究  

Study on adsorption properties of directly-thiolated graphene for mercury

作　　者：蔡元兴[1] 徐希杉 王振华[2] CAI Yuanxing;XU Xishan;WANG Zhenhua(School of Material Science and Engineering, Shandong Jianzhu University, Jinan 250101, China;Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China)

机构地区：[1]山东建筑大学材料科学与工程学院,山东济南250101 [2]齐鲁工业大学(山东省科学院)山东省分析测试中心,山东济南250014

出　　处：《山东建筑大学学报》2020年第3期13-20,60,共9页Journal of Shandong Jianzhu University

基　　金：国家自然科学基金项目(21277084);山东省自然科学基金项目(ZR2019MB073)。

摘　　要：直接巯基化石墨烯具有成本低、亲水性好、易分散、易分离和可循环利用等优点,研究其制备方法、物理化学性质和使用条件,可以为水中汞的去除提供新的思路。文章采用“一锅法”直接将巯基引入氧化石墨烯,通过SEM、TEM、EDS和XPS等表征手段进行实验,研究了pH值和共存离子对直接巯基化石墨烯吸附汞的影响,确定了吸附动力学模型和吸附等温方程,考察了直接巯基化石墨烯的循环利用情况。结果表明:通过设计的工艺路线成功地合成了直接巯基化墨烯,其中pH=6是直接巯基化石墨烯对汞吸附的最佳条件;直接巯基化石墨烯与汞之间的吸附行为为化学吸附;通过计算所得的最大吸附量为143.9 mg/g;即使循环利用4次以后,材料还保留有85%的吸附量,直接巯基化石墨烯在汞吸附方面具有广阔的应用潜力。Directly-thiolated graphene has the advantages of low cost,good hydrophilicity,easy dispersion,easy separation and recyclability.Studying its preparation method,physicochemical properties and use conditions can provide new ideas for mercury removal in water.In this paper,the“one-pot method”was used to directly introduce mercapto groups into graphene oxide and tested by characterization methods such as SEM,TEM,EDS,and XPS.The effect of pH and coexisting ions on the adsorption of mercury ions by directly-thiolated graphene were investigated.The kinetic model and adsorption isotherm equation were determined and the recycling of directly-thiolated graphene was investigated.The results show:Directly-thiolated graphene has been successfully synthesized through the designed strategy;pH=6 is the best condition for the adsorption between directly-thiolated graphene and mercury ions;the adsorption behavior between directly-thiolated graphene and mercury ions is chemisorption;the maximum adsorption amount obtained by calculation is 143.9 mg/g;even after 4 times of recycling,the material still retains 85%of the adsorption capacity,and the material has application potential.

关 键 词：石墨烯 巯基化 汞 循环利用 

分 类 号：X703[环境科学与工程—环境工程]