Silver nanoparticles decorated polydopamine-coated pure silica zeolite as an efficient nanocatalyst for organic pollutants removal

被引:5
|
作者
Ouyang, Chaoliu [2 ]
Liu, Sheng [1 ,2 ]
Guo, Yujuan [1 ]
Yi, Shunmin [2 ]
Li, Qing [1 ,2 ]
机构
[1] Hubei Univ, Sch Mat Sci & Engn, Key Lab Green Preparat & Applicat Funct Mat, Hubei Key Lab Polymer Mat,Minist Educ, Wuhan 430062, Peoples R China
[2] Guangxi Minzu Univ, Guangxi Coll & Univ Key Lab Environm Friendly Mat, Guangxi Key Lab Adv Struct Mat & Carbon Neutraliza, Sch Mat & Environm, Nanning 530105, Peoples R China
基金
中国国家自然科学基金;
关键词
Silver nanoparticles; Polydopamine; Pure silicon zeolite; Catalytic reduction of MB and 4-NP; CATALYTIC-REDUCTION; METHYLENE-BLUE; FABRICATION; COMPOSITES; SPHERES; AG;
D O I
10.1016/j.apsusc.2023.159281
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
An efficient catalyst, composed of silver-decorated polydopamine coatings on pure silicon zeolite (PSZN/PDA/ Ag), capable of removing organic pollutants in water effectively, was synthesized using an economical in-situ reduction approach. The polydopamine (PDA) coating facilitates the stable dispersion of silver (Ag) nanoparticles and offers numerous catalytic active sites. This can be attributed to the ability of PDA in acting as a redox medium, via the interchange between its catechol group and the benzoquinone structure, thereby decreasing impediments to electron transfer among reactants, and consequently promoting the catalytic reaction. The porous structure of PSZN aids in embedding the PDA elements inside the pores, preventing the coating from peeling off and providing additional adsorption to transport reactants to the catalytic center for cooperative catalysis. Leveraging these properties, it demonstrates excellent efficiency and reusability in the catalytic reduction of waste methylene blue (MB) and 4-nitrophenol (4-NP), achieving reaction rates of 41.23 x 10-2 min-1 across five cycles respectively, with a minimum average conversion rate of 96 %. Moreover, the impressive performance is primarily due to the significant load (wt = 30.7 %) and small size (11.85 nm) of Ag nanoparticles, which boast a large number of reaction centers.
引用
收藏
页数:13
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