Photocatalytic Study of ZnO-CuO/ES on Degradation of Congo Red

Investigation of the Self-Cleaning Property of Photocatalytic Coatings at a Laboratory Scale

“…The authors highlighted the oxidation process of the Congo red by following the changes in its characteristic Raman bands. Moreover, Khairol et al [62] studied the photocatalytic performance of ZnO-based catalysts by assessing the removal of Congo red in aqueous solution under visible light illumination. However, the use of dyes may be inappropriate in some conditions.…”

Green synthesis of P − ZrO2CeO2ZnO nanoparticles using leaf extracts of Flacourtia indica and their application for the photocatalytic degradation of a model toxic dye, Congo red

“…Visible light induced photocatalysis has been shown to be highly efficient in degrading dyes without any secondary contamination [22] . Photocatalytic degradation can be improved by lessening the band gap and extending the absorption range to visible region leading to electron hole separation by coupling semiconductor catalysts [23] . Congo red has been removed from water using photocatalysts such as [24] , nanoperovskites [25] , [26] , Ru nanoparticles supported on unfunctionalized single walled carbon nanotubes [27] , [28] , PANI nanoarrays anchored on nanoplates [29] .…”

Low‐cost nano‐TiO2 composites for remediation of textile dyes: Appraisal on the effect of solar and ultraviolet irradiations

“…Ghaly, Ananthashankar, Alhattab, and Ramakrishnan (2014) mentioned a wide range of dye concentrations discharged from dye houses (10–250 mg/L). However, the lab studies carried out for the dye decontamination involved the use of low concentrations; 0.01 mM methyl orange (Bathla, Rather, Poonia, & Pal, 2020), 50 mM methyl orange (Saleh & Gupta, 2012), 10 mg/L congo red (Jo, Kumar, Isaacs, Lee, & Karthikeyan, 2016; Khairol, Sapawe, & Danish, 2019; Moradzadeh, Mahjoub, Sadjadi, Sadr, & Farhadyar, 2020; Wahi et al, 2005; Wang et al, 2007; Wang, Zhang, Deng, Chen, & Zou, 2007), 10 mg/L methyl orange (Boczar, Lecki, & Skompska, 2020), 20 mg/L congo red (Patil et al, 2018), 20 mg/L methyl orange (Lu, Shan, Shi, Wang, & Yuan, 2019; Yang et al, 2019), 25 μmol/L methyl orange and congo red (Ljubas, Smoljanic, & Juretic, 2015), 25 mg/L of methyl orange and congo red (Habiba, Lee, Joo, Ang, & Afifi, 2019), and 30 mg/L congo red (Thomas, Naikoo, Sheikh, Bano, & Khan, 2016). Recent studies have reported decolorization of congo red and methyl orange dyes by various photocatalysts, some of which have been documented in Table 1.…”