Photo-assisted degradation of organic pollutant by CuFeS2 powder in RGB-LED reactors: A comprehensive study of band gap values and the relation between wavelength and electron-hole recombination

Chalcopyrite as an oxidants activator for organic pollutant remediation: A review of mechanisms, parameters, and future perspectives

“…The results indicated that under both red and white light irradiation, the ROS involved are predominantly • OH, whereas • O 2 − plays a minor role in the degradation process. Results also confirmed that h + has not been involved in pollutant degradation [ 41 ]. In order to assess the degradation of Rhodamine B (RhB) in the Fenton process, Yang J et al (2022) utilized TBA and IPA to quench the • OH radicals present on the catalyst surface and in solution, respectively.…”

“…Then the Na 2 S.9H 2 O was added to the mixture and stirred at 70 °C for 3 h [ 29 ]. Vieira Y et al (2022) synthesized chalcopyrite similar to Wen PY's study, with the difference that this work used cupric chloride (CuCl 2 ) as the Cu source and polyvinyl-pyrrolidone surfactant to balance electrostatic charges and provide promising conditions for gaining the favorite product [ 41 ]. Nie W et al (2019) and Xu X et al (2019) have synthesized CuFeS 2 via hydrothermal technique, using materials including CuCl, FeCl 3 , and ammonium sulfide (NH 4 ) 2 S as a sulfur source [ 37 , 42 ].…”

“… Pollutant Pollutant concentration (mg/L) pH Oxidant Concentration (mM) molar ratio of oxidant/pollutant Chalcopyrite dosage (g/L) Reaction time (min) Reactive species Solution matrix Light source Pollutant removal (%) Ref. 2,4-dichlorophenol (2,4-DCP) 10 7 60 (H 2 O 2 ) & 25(PC) 978 and 407 0.5 120 • OH, 1 O 2 , • CO 3 − & O 2 • − DW – 90 [ 37 ] yellow tartrazine (YT) dye 75 3 0.25 (H 2 O 2 ) 1.78 0.25 60 • OH & O 2 • − Ethanol/DW Red LED 88.1 [ 41 ] Green LED 81.4 Blue LED 67.7 White LED 64.3 Bisphenol A (BPA) 20 6 0.3 (PS) 3.5 0.1 20 • OH & SO 4 • − Ultrapure Water – 99.7 [ 42 ] …”

“…This work suggested 3 factors involved in the decreasing of the catalytic activity of chalcopyrite after 5 reuses. a) reduction of Fe and Cu content due to leaching b) occupancy of the active site by degradation by-products c) the structural change resulting from improved radical species generation [ 41 ]. Chang SA et al (2020) investigated the chalcopyrite (synthetic type) stability in the photocatalytic process.…”

Progress and prospective of heterogeneous catalysts for H2O2 production via anthraquinone process

“…It can be united with a light source, catalyst, and ozone to remove various gaseous and aqueous pollutants from the effluent treatment plant. H 2 O 2 is generally used in the wastewater treatment plant for wet peroxide oxidation, Fenton and photo-Fenton oxidations, sono-Fenton, electro-Fenton, and photocatalytic degradation reactions (Vieira et al 2022;Perathoner and Centi, 2005;Rokhina and Virkutyte, 2010;Debellefontaine et al 1996;Domingues et al 2017;Gomes et al 2010;Ribeiro et al 2013Ribeiro et al , 2016Ribeiro et al , 2015. In situ generation of H 2 O 2 or may be combining it with the photocatalytic water treatment process enhances the degradation of pollutants due to its promoting effect (Cui et al 2012;Yao et al 2016b;Kumar et al 2017;Zhou et al 2018;Deng et al 2017).…”