二氧化硅/聚噻吩复合吸附剂处理Pb^(2+)和Cd^(2+)  

Treatment of Pb^(2+) and Cd^(2+) with Silica/Polythiophene Composite Adsorbent

作　　者：张丽丽 ZHANG Li-li(College of Energy and Chemical Engineering,Puyang Vocational and Technical College,Puyang 457000,China)

机构地区：[1]濮阳职业技术学院能源与化学工程学院,河南濮阳457000

出　　处：《化学试剂》2022年第3期385-392,共8页Chemical Reagents

摘　　要：绿色环保、高效等特点是吸附剂发展的趋势。以溶胶-溶剂热法合成了SiO_(2),再与聚噻吩反应合成了SiO_(2)/聚噻吩复合材料。采用扫描电镜(SEM)、傅里叶红外光谱(FT-IR)以及Zeta电位对复合材料进行了表征分析。SiO_(2)/聚噻吩是表面粗糙的球形,且表面带有负电荷。SiO_(2)/聚噻吩复合材料用于吸附Pb^(2+)和Cd^(2+)离子,改变吸附过程中的变量来研究吸附过程的影响因素,通过探讨动力学和等温线模型来研究其吸附机理。研究结果表明,pH通过改变SiO_(2)/聚噻吩表面的电荷数来影响吸附性能,吸附容量与吸附剂的量不呈正相关。同时得知,SiO_(2)/聚噻吩吸附剂吸附Pb^(2+)和Cd^(2+)的过程符合拟二级动力学模型及Langmuir等温线模型。根据研究结果提出吸附机理:SiO_(2)/聚噻吩表面的负电荷吸引带有正电荷的重金属离子,以单分层的化学吸附为主吸附过程。Development of adsorbents is required to meet green environmental protection and high efficiency.This contribution reports SiO_(2)/polythiophene is composites which were synthesized by sol-solvothermal method using SiO_(2) and polythiophene,and characterization results by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR)and Zeta potential illustrate the composites to be spherical with surface rough and negatively charged.The composite are used to adsorb Pb and Cd ions,and the factors influencing the adsorption process are studied,and the adsorption mechanism is studied by discussing the kinetics and isotherm model.The results show that pH affects the adsorption performance by changing the charge number of SiO_(2)/polythiophene surface,and the adsorption capacity is un-correlated with the amount of adsorbent.It is also found that the adsorption process of Pb and Cd on SiO_(2)/polythiophene is adsorbent conforms to the pseudo second-order kinetic model and Langmuir isotherm model.Consequently,the adsorption mechanism is proposed:the negative charge on the SiO_(2)/polythiophene surface attracts the positively charged heavy metal ions,and the single layered chemical adsorption is the main adsorption process.

关 键 词：吸附剂 复合材料 污水处理 二氧化硅 聚噻吩 

分 类 号：TQ3118[化学工程—高聚物工业]