Fast Cr(vi) wastewater remediation on a Bi_xO_y/CdS heterostructure under simulated solar light induction

Abstract

Bismuth oxide (BixOy), an important bismuth based semiconductor with visible-light response, good structural stability and non-toxic, is identified as a potential candidate for chromium (Cr(VI))-containing wastewater remediation. However, the poor...

In Situ Reconstruction of Active Catalysis Sites Triggered by Chromium Immobilization for Sulfite Oxidation

“…To ensure relatively high sulfite oxidation and Cr removal efficiency simultaneously, the typical pH in this study was determined to be 6.0. Cr­(VI) was in a predominantly anionic form of HCrO 4 – and CrO 4 − at a typical pH of 6.0. Therefore, the main redox reaction between Cr­(VI) and sulfite is presented in eqs and .…”

“…Chromium (Cr) is a hazardous pollutant in wastewater originating from electroplating, leather tanning, pigment, metallurgy, and other chemical industries, whose environmental toxicity differs from its valence states. Hexavalent chromium (Cr­(VI)) exhibits extremely high mutagenicity, carcinogenicity, and teratogenicity to the human body, − while trivalent chromium (Cr­(III)) is less toxic in water and even has favorable therapeutic capabilities for treating diabetes mellitus. , Typically, the remediation of Cr­(VI) wastewater has aroused much attention with various effective methods that have been applied, such as chemical precipitation, − induced reduction, , membrane separation, adsorption, , ion exchange, biological processing, etc. However, a promising and feasible state-of-the-art method for Cr­(VI) treatment is the adsorption-coupled reduction, − which aims for both attenuation and ultimately control, with low cost and easy operation features.…”

Applications of bismuth-based nanoparticles for the removal of pollutants in wastewater: a review

“…40 Bi-based NPs also exhibit catalytic potential for removing heavy metals, including chromium 41,42 and lead, 43 signifying the significance in addressing industrial and mining wastewater containing heavy metals. 44 Moreover, the commendable catalytic activity of Bi-based NPs under light conditions makes them suitable for photocatalytic degradation of pollutants in water, presenting potential applications in solar-driven water remediation. [45][46][47] These diverse applications underscore the multifunctionality and substantial benefits of Bi-based NPs in the field of water remediation.…”

Simulated-sunlight-driven Cr(vi) reduction on a type-II heterostructured Sb2S3/CdS photocatalyst

“…1 Hexavalent chromium (Cr( vi )), a typical heavy metal ion with strong carcinogenic toxicity, is generally originated from industrial manufacturing processes, such as metal surface treatment, leather tanning, printing and dyeing, etc. 2 In view of the low toxicological property of trivalent chromium (Cr( iii )), people usually remediate Cr( vi ) wastewater through reduction methods, such as chemical reduction, 3 electrolysis, 4 biological methods, 5 ion exchanging 6 and adsorption, 7 etc. However, these methods generally have defects of secondary pollution, high energy consumption and high cost; thereby, more simple, low-cost and eco-friendly strategies should be developed.…”