Photocatalytic degradation of malachite green dye using chitosan supported ZnO and Ce-ZnO nano-flowers under visible light

被引:264
作者
Saad, Alaa Magdy [1 ]
Abukhadra, Mostafa R. [2 ]
Ahmed, Sayed Abdel-Kader [1 ]
Elzanaty, Ali M. [1 ]
Mady, Amr H. [3 ,4 ]
Betiha, Mohamed A. [3 ,5 ]
Shim, Jae-Jin [4 ]
Rabie, Abdelrahman M. [3 ,4 ]
机构
[1] Beni Suef Univ, Fac Sci, Chem Dept, Bani Suwayf, Egypt
[2] Beni Suef Univ, Fac Sci, Geol Dept, Bani Suwayf, Egypt
[3] EPRI, Cairo, Egypt
[4] Yeungnam Univ, Sch Chem Engn, Gyongsan 38541, Gyeongbuk, South Korea
[5] Cairo Univ, Egypt Nanotechnol Ctr EGNC, El Shiekh Zayed 12588, Egypt
基金
新加坡国家研究基金会;
关键词
Chitosan; ZnO nano-flowers; Ce doped ZnO; Photocatalyst; Visible light; Malachite green; MICROWAVE-ASSISTED SYNTHESIS; WASTE-WATER; REMOVAL; NANOCOMPOSITES; UV; PHOTODEGRADATION; NANOPARTICLES; COMPOSITES; REDUCTION; SUNLIGHT;
D O I
10.1016/j.jenvman.2019.110043
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Two types of chitosan-based composites (chitosan/ZnO and chitosan/Ce-ZnO composites) were synthesized under microwave irradiation and characterized as advanced catalysts of enhanced photocatalytic activity under the visible light. The morphological investigation reflected the formation of ZnO and Ce doped ZnO at stunning micro flowers of nano limps. Additionally, the optical studies reflected a reduction in the bandgap of ZnO from 3.3 eV to 2.85 eV and 2.5 eV after supporting it onto chitosan chains and after doping it with cerium, respectively. The synthetic composites were applied in photocatalytic removal of malachite green dye under a visible light source. The synthetic CH/ZnO and CH/Ce-ZnO showed enhancement in the photocatalytic removal of M.G by 54% and 87%, respectively, as compared to the pure ZnO. The synthetic composites are of high stability and can be reused for five photocatalytic degradation cycles at stunning removal percentages. The main oxidizing radicals during the removal of M.G by CH/ZnO are the generated electron-hole pairs as well as the hydroxyl radicals. The effective species in CH/Ce-ZnO photocatalytic system are the photogenerated hydroxyl radicals followed by the electron-hole pairs.
引用
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页数:11
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