[Retracted] Effect of Cu Doping on ZnO Nanoparticles as a Photocatalyst for the Removal of Organic Wastewater

Table 1

Comparison of various parameters of Cu-doped ZnO NPs with published articles.

S. no/reference	Precursors	Temperature/time	Technique	Morphology	Product	Dye	Year
[25]	Zn (CH3COO)2 2H2O and CuSO4 5H2O	25 C/3 h	Sol-gel method	Nanoparticles	Cu-doped ZnO	Methyl orange	2011
[26]	ZnCl2 and CuCl2·5H2O	120 C/1 h	Coprecipitation method	Nanoparticles	Cu-doped ZnO	—	2014
[27]	Zn (NO3)2 6H2O and CuSO4 5H2O		Coprecipitation method	Nanoparticles	Cu-doped ZnO	Methylene blue	2015
[28]	Zn (NO3)2.6H2O and CuSO4 5H2O	85 C/1 h	Hydrolysis and oxidizing process	Nanoparticles	Cu-doped ZnO	Benzylic alcohols	2015
[29]	Zn (CH3COO)2 2H2O and CuCl2	450 C/5 h	Coprecipitation method	Nanoflakes	Cu-doped ZnO	3-styryl-chromones	2016
[30]	ZnSO4 and CuSO4	250 rpm/12 h	Soft chemical method	Nanoparticles	Cu-doped ZnO	Methylene blue	2017
[31]	Zn (NO3)2.6H2O and Cu (NO3)2	200 C/2 h	Green chemistry	Nanoparticles	Cu-doped ZnO	Acid black 234	2017
[32]	ZnCl2 and CuCl2	80 C/18 h	Coprecipitation method	Nanorods	Cu-doped ZnO	Diazinon	2017
[33]	Zn (NO3)2.6H2O and Cu (NO3)2	80 C/3 h	Coprecipitation method	Nanoparticles	Cu-doped ZnO	—	2019
[34]	Zn (CH3COO)2 2H2O and Cu (CH3COO)2 2H2O	100 C/2 h	Coprecipitation method	Nanoparticles	Cu-doped ZnO	Arsenic	2020
[35]	Zn (NO3)2 6H2O and Cu (NO3)2 5H2O	550 C/3 h	Flash combustion method	Nanoparticles	Cu-doped ZnO	Methyl green	2020
Our article	ZnCl2 and CuCl2.2H2O	170 C/22 h	Hydrothermal method	Nanoparticles	Cu-doped ZnO	Methylene blue	2021