Ceramic metal oxides with Ni2+ active phase for the fast degradation of Orange II dye under dark ambiance

被引：23

作者：

Chen, Huihuang ^{[1
]}

Motuzas, Julius ^{[1
]}

Martens, Wayde ^{[2
]}

da Costa, Joao C. Diniz ^{[1
]}

机构：

[1] Univ Queensland, Funct Interfacial Mat & Membranes Lab FIM2Lab, Sch Chem Engn, Brisbane, Qld 4072, Australia

[2] Queensland Univ Technol, Fac Sci & Engn, Brisbane, Qld 4000, Australia

来源：

CERAMICS INTERNATIONAL | 2018年 / 44卷 / 06期

基金：

澳大利亚研究理事会;

关键词：

Ceramics; Ni2+ phase; OII degradation; Dark condition; Fast reaction; SYNTHETIC ORGANIC-DYES; AQUEOUS-SOLUTION; CATALYTIC-ACTIVITY; GRAPHENE OXIDE; AMBIENT CONDITIONS; WASTE-WATER; AZO DYES; NANOCOMPOSITE; POLLUTANTS; LIGHT;

D O I：

10.1016/j.ceramint.2018.01.071

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Ceramic metal oxides based on calcium strontium nickel (CSN) were synthesized via a combined EDTA-citric acid complexation method and evaluated using Orange II (OH) as the model pollutant under dark conditions, without adding any extemal stimulants. The CSN catalyst was characterized by a very fast reaction reaching 97% OH degradation within 5 min. The surface of CSN metal oxides proved to be very active toward the breakdown of the -N=N- azo bond of OII. A second electron generating pathway was found as Ni2+ phase in the CSN catalyst oxidized to Ni3+ for the spent catalyst. Both electron generating pathways resulted in the formation of hydroxyl radicals (OH.) as determined using radical quenchers. Hydroxyl radicals were responsible for the formation of several intermediate products. The Ni2+ phase was very active contrary to the Ni3+ phase which could not degrade OH. The fast degradation kinetics of OII using CSN in dark at room temperature was attributed to the double electron generation pathways.

引用

页码：6634 / 6640

页数：7

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