海藻酸钠包裹纳米树脂材料新型吸附剂的制备及其对Au(Ⅲ)的吸附性能  

Preparation of nanoresin encapsulated with sodium alginate and adsorption properties of Au(Ⅲ)

作　　者：马琼 谢丽 邵安娜 李颖浩 黄巧云 MA Qiong;XIE Li;SHAO An-na;LI Yin-hao;HUANG Qiao-yun(College of Biological and Food Engineering,Hubei University for Nationalities,Enshi445000,Hubei,China;Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province,Hubei University for Nationalities,Enshi 445000,Hubei,China;State Key Laboratory of Agricultural Microbiology,Huazhong Agricultural University,Wuhan 430071,China)

机构地区：[1]湖北民族大学生物与食品工程学院,湖北恩施445000 [2]湖北民族大学生物资源保护与利用湖北省重点实验室,湖北恩施445000 [3]华中农业大学农业微生物学国家重点实验室,武汉430071

出　　处：《兰州大学学报（自然科学版）》2023年第2期256-264,共9页Journal of Lanzhou University(Natural Sciences)

基　　金：湖北省自然科学基金项目(2021CFB552);恩施州科技计划项目(D20190025);湖北民族大学高水平科研成果校内培育项目(PY20020);农业微生物学国家重点实验室开放课题项目(2023006)。

摘　　要：利用海藻酸钠(SA)的亲水性质,将硫脲改性的间苯二酚甲醛硫脲(RFT)纳米材料包裹于SA凝胶中,制备了一种高效、稳定的新型复合吸附剂RFT-SA,研究该吸附剂对水溶液中Au(Ⅱ)的吸附性能.利用扫描电子显微镜、透射电子显微镜和X射线光电子能谱对RFT进行表征,研究pH、吸附时间、温度、Au(Ⅲ)初始质量浓度(p_(0))和竞争离子对Au(IⅢI)吸附过程的影响,探讨吸附机理.结果表明,在溶液pH=3时,RFT-SA对Au(II)的吸附效果最优,吸附量为238mg/g(p_(0)=20mg/L,吸附率为97%,T=308K).吸附过程符合Langmuir模型与准二级动力学速率方程,是自发进行的吸热过程.吸附体系主要为化学吸附,硫脲基团在吸附过程中起主要作用,Au(II)在被吸附的同时被还原为Au(I)和Au(O).With a view to the hydrophilic properties of sodium alginate(SA),resorcinol formaldehyde thiourea(RFT)resin nanomaterials were encapsulated in SA gel to prepare a new efficient and stable composite adsorbent RFT-SA.The adsorption performance of the adsorbent for Au(Ⅲ)in aqueous solution was studied.Prepared samples were characterized via scanning electron microscopy,transmission electron microscopy and X-ray photoelectron spectroscopy.The effects of pH,adsorption time,temperature,initial Au(Ⅲ)concentration(p_(0))and competing ions on Au(Ⅲ)adsorption were investigated,and the adsorption mechanism discussed.The results showed that RFT-SA had an excellent adsorption effect on Au((Ⅲ)and a maximum adsorption capacity of 238 mg/g(p_(0)=20 mg/L,adsorption rate was 97%,T=308 K)when the solution had pH=3.The adsorption process conformed to the Langmuir model and the pseudo-second-order kinetic rate equation.The adsorption system was a spontaneous endothermic process and a chemical adsorption.Thiourea groups played a major role in the adsorption process,and Au(Ⅲ)was reduced to Au(I)and Au(O)at the same time of adsorption.

关 键 词：回收Au 吸附 动力学 热力学 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程]