Catalytic Oxidation of Methylene Blue by Use of Natural Zeolite-Based Silver and Magnetite Nanocomposites

被引：13

作者：

Kuntubek, Aldiyar ^{[1
,2
]}

Kinayat, Nurassyl ^{[1
,2
]}

Meiramkulova, Kulyash ^{[3
]}

Poulopoulos, Stavros G. ^{[1
,2
]}

Bear, Joseph C. ^{[4
]}

Inglezakis, Vassilis J. ^{[1
,2
]}

机构：

[1] Nazarbayev Univ, Sch Engn & Digital Sci, Dept Chem & Mat Engn, Environm Sci & Technol Grp ESTg, Nur Sultan 020000, Kazakhstan

[2] Nazarbayev Univ, Environm & Resource Efficiency Cluster EREC, Nur Sultan 020000, Kazakhstan

[3] LN Gumilyov Eurasian Natl Univ, Dept Environm Engn & Management, Nur Sultan 020000, Kazakhstan

[4] Kingston Univ, Sch Life Sci Pharm & Chem, Penrhyn Rd, Kingston Upon Thames KT1 2EE, Surrey, England

来源：

PROCESSES | 2020年 / 8卷 / 04期

关键词：

zeolites; clinoptilolite; methylene blue; oxidation; nanoparticles; silver; silver oxide; magnetite; MICROBIAL DECOLORIZATION; ACTIVATED CARBON; FENTON REACTION; REMOVAL; ADSORPTION; DEGRADATION; PERFORMANCE; MECHANISMS; SURFACE; COLOR;

D O I：

10.3390/pr8040471

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

This work reports the synthesis of natural zeolite-based silver and magnetite nanocomposites and their application for the catalytic oxidation of methylene blue in water. The zeolite was impregnated with 5.5 wt.% Fe in the form of magnetite nanoparticles with size of 32 nm, and with 6.4 wt.% Ag in the form of silver oxide and metallic silver nanoparticles with sizes of 42 and 20 nm, respectively. The results showed that physical adsorption contributed to the removal of methylene blue by 25-36% and that Fe3O4@NZU is superior to Ag2O@NZU and Ag-0@NZU, leading to 55% removal without oxidant and 97% in the presence of H2O2. However, there is no evidence of significant mineralization of methylene blue. The application of reaction rate models showed that the reaction order changes from zero to first and second order depending on the H2O2 concentration.

引用

页数：15

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