Simultaneous Removal of Cu(II) and Cr(VI) Ions from Wastewater by Photoreduction with TiO2–ZrO2

Application of pyridine-modified chitosan derivative for simultaneous adsorption of Cu(II) and oxyanions of Cr(VI) from aqueous solution

“…In addition to the tannery industry, copper is also emitted from the sewage pipe lines (Sarkar et al, 2015). Regarding this kind of waste, some works reported the use of photoreduction (Yan et al, 2020) and adsorption on carbonized crofton weed (Chen et al, 2016) and hyacinth shoot powder (Sarkar et al, 2017) for simultaneous removal of Cr(VI) and Cu(II). Copper and chromium are also present in the formulation of chromated copper arsenate (CCA), a wood preservative to avoid attack by termites and fungi (ATSDR, 2011).…”

Recent Advances of Photocatalytic Application in Water Treatment: A Review

“…TiO 2 -ZrO 2 has been used for the removal of heavy metal ions, exhibiting relatively highly chemical stability and excellent sorption characteristics. As reported, this material can efficiently degrade Cu(II) and Cr(VI) in one step and exhibited the high removal rates of Cr(VI) (100%) and Cu(II) (91%) after four cycles [ 51 ]. Organic-inorganic hybrid PW12/CN@Bi 2 WO 6 composite exhibited enhanced absorbance of photons and promoted charge transfer, and achieved a removal rate of 98.7% for Cr(VI) [ 52 ].…”

Removal of Cr (VI) from aqueous solutions using clinoptilolite modified by TiO2 and polyoxypropylene surfactant

“…These approaches are hampered by their high cost and creation of concentrated Cr (VI) solid wastes that require further management and pose secondary pollutant risks (Barrera‐Díaz et al, 2012). Recently, advanced oxidation processes, such as photocatalysis, have shown a potential for Cr (VI) treatment (Sane et al, 2018) and the use of photocatalysts for Cr (VI) treatment has increased due to easy preparation and high efficiency (Xu et al, 2013; R. Yan et al, 2020; Y. Yang et al, 2014). Among the various photocatalysts being used to remove Cr (VI) pollutants from water, titanium dioxide (TiO 2 ) has received increased attention due to its photocatalytic activity in the solar spectrum, high oxidizing potential, chemical and biological stability, high selectivity, and low human toxicity (Abellan et al, 2009; Hussain et al, 2011; Sun et al, 2002; Tahir & Amin, 2013; Zainudin et al, 2010).…”

“…By definition, in photocatalytic reactions, solar energy changes into chemical energy for the oxidation or reduction of pollutions (Nakata & Fujishima, 2012). This process has been used by several researchers for Cr (VI) removal from aqueous solutions (Sane et al, 2018; Wu et al, 2013; Yin, He et al, 2020).…”

“…Preliminary research suggests that a structural modification and the compositional change of pure TiO 2 by doping the SiO 2 ‐based materials improved its photocatalytic activity, thus, improving its visible‐light photocatalytic performance (R. Yan et al, 2020). The common support materials for TiO 2 nanoparticle applications are clay minerals due to their porous structure and stability, high specific surface area, and adsorption capacity (An et al, 2008; Bouna et al, 2011; Kaneko et al, 2001; Shao et al, 2010).…”