基于蛋壳膜基碳点合成Ag/E-CDs/Fe_(3)O_(4)及其催化还原性能  

Synthesis of Ag/E-CDs/Fe_(3)O_(4)based on carbon dot derived from eggshell membrane and its performance of catalytic reduction

作　　者：张大琴 李超勇 贾志刚[1] 罗光程 武林 许立信[1] ZHANG Daqin;LI Chaoyong;JIA Zhigang;LUO Guangcheng;WU Lin;XU Lixin(School of Chemistry and Chemical Engineering,Anhui University of Technology,Ma'anshan 243032,Anhui,China)

机构地区：[1]安徽工业大学化学与化工学院,安徽马鞍山243032

出　　处：《精细化工》2021年第1期118-123,共6页Fine Chemicals

基　　金：国家自然科学基金(20907001);安徽省大学生创新创业训练计划项目(201810360208,201710360200)。

摘　　要：采用FeCl_(3)·6H_(2)O、尿素、硝酸银为原料,以碳量子点为还原剂,通过水热和光催化两步法合成了Ag/E-CDs/Fe_(3)O_(4)复合物(ECIA)。利用鸡蛋壳膜制备了碳量子点表面活性基团,先合成了E-CDs/Fe_(3)O_(4),然后在光照条件下,Ag粒子进一步沉积于E-CDs/Fe_(3)O_(4)表面。采用XRD、FTIR、SEM、TEM和荧光光谱(PL)等对产物进行表征。以水体中的对硝基苯酚(4-NP)为模拟污染物,研究了ECIA的催化还原性能。探讨了复合物中含Ag量、催化剂用量、4-NP初始浓度对催化还原反应的影响。结果表明,E-CDs/Fe_(3)O_(4)与Ag粒子复合后提高了催化剂的催化活性,但复合物含Ag量过高会降低催化剂催化活性,其中,硝酸银添加量为2mg时所得样品ECIA-2催化活性最佳,对4-NP的催化还原反应符合一级动力学方程,室温下该反应的ki为0.6441 min^(-1)。Ag/E-CDs/Fe_(3)O_(4)composites(ECIA)were synthesized by hydrothermal and photocatalytic two-step process using FeCl_(3)·6H_(2)O,urea and AgNO3 as raw materials and carbon quantum dots as reducing agent.E-CDs/Fe3 O4 was first prepared by using the surface rich functional groups of carbon quantum dots(CDs)derived from eggshell membrane(E-CDs).Then,silver particles were further deposited onto the surface of E-CDs/Fe_(3)O_(4)under the light illumination.The products were characterized by XRD,FTIR,SEM,TEM and photoluminescence(PL).The catalytic reduction properties of the as-synthesized Ag/E-CDs/Fe_(3)O_(4)composites(ECIA)were investigated using 4-nitrophenol(4-NP)as a probe pollutant in water.The effects of silver content,catalytic dosage and initial concentration of 4-NP on the reduction of4-NP were investigated.The results showed that the cooperation of E-CDs/Fe_(3)O_(4)and silver particles enhanced the catalytic activity of the catalyst,while the excessive content of silver content in the composite led to the decrease of catalytic activity of the catalyst.Especially,the catalytic activity of ECIA-2 sample prepared using 2 mg of AgNO3 was the best.The reduction and degradation of 4-NP was in accordance with the first-order kinetic reaction,and ki was 0.6441 min^(-1).

关 键 词：蛋壳膜 碳点 催化还原 对硝基苯酚 催化技术 

分 类 号：O643.36[理学—物理化学] TQ630[理学—化学]