Enhanced sonocatalytic performance of ZnTi nano-layered double hydroxide by substitution of Cu (II) cations

被引:30
作者
Daneshvar, H. [1 ]
Dorraji, M. S. Seyed [1 ]
Amani-Ghadim, A. R. [2 ]
Rasoulifard, M. H. [1 ]
机构
[1] Univ Zanjan, Fac Sci, Dept Chem, Appl Chem Res Lab, Zanjan, Iran
[2] Azerbaijan Shahid Madani Univ, Fac Sci, Dept Chem, POB 83714-161, Tabriz, Iran
关键词
Sonocatalysis; LDHs; Active free radicals; Water treatment; TEXTILE WASTE-WATER; PHOTOCATALYTIC DEGRADATION; ORGANIC POLLUTANTS; METHYLENE-BLUE; ADSORPTION; ACID; DYE; NANOPARTICLES; OPTIMIZATION; ZNO;
D O I
10.1016/j.ultsonch.2019.104632
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
In this research, a series of CuZnTi-LDHs with different Cu2+/Zn2+ molar ratio were synthesized by co-precipitation method with the purpose of improving the sonocatalytic performance of ZnTi-LDH. All the LDH samples were synthesized by a facile co-precipitation process. The as-prepared LDHs were characterized by Powder X-ray diffraction (XRD), Field emission-scanning electron microscopy (FESEM), Transition electron microscopy (TEM), Brunauer-Emmelt-Teller (BET) analysis, and UV-visible diffuse reflectance spectroscopy (DRS) analysis. The results showed that Cu2+ substitution can significantly enhance the sonocatalytic properties of ZnTi-LDH. The Methylene blue degradation percentage over ZnTi-LDH reached 30% in 90 min, whilst this percentage reaches 71% over CuZnTi-LDH (1:1). The role of the Cu2+ incorporation on the observed enhancement in sonocatalytic performance was revealed by investigating the effect of radical scavengers on degradation efficiency and DRS spectra of ZnTi-LDH and CuZnTi-LDH (1:1). Benzoquinone (BQ), ammonium oxalate and tert-Bu lead to 22.5%, 53.5% and 74.6% decrease in degradation percentage by CuZnTi-LDH (1:1). However, the degradation efficiency showed 16.6%, 3.3% and 63.3% reduction in the presence of BQ, ammonium oxalate and tert-Bu respectively, in dye degradation by ZnTi-LDH. DRS spectra demonstrated that the band gap of the LDH decreases by Cu2+ substitution. The effect of operational parameters on sonodegradation was investigated as well. The kinetics of sonodegradation reaction obeyed the first order reaction kinetics with R-2 of 0.95.
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页数:9
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