Construction of Core–shell Sb₂s₃@Cds Nanorod with Enhanced Heterointerface Interaction for Chromium‐Containing Wastewater Treatment

Abstract

How to collaboratively reduce Cr(VI) and break Cr(III) complexes is a technical challenge to solve chromium‐containing wastewater (CCW) pollution. Solar photovoltaic (SPV) technology based on semiconductor materials is a potential strategy to solve this issue. Sb2S3 is a typical semiconductor material with total visible‐light harvesting capacity, but its large‐sized structure highly aggravates disordered photoexciton migration, accelerating the recombination kinetics and resulting low‐efficient photon utilization. Herein, the uniform mesoporous CdS shell is in situ formed on the surface of Sb2S3 nanorods (NRs) to construct the core–shell Sb2S3@CdS heterojunction with high BET surface area and excellent near‐infrared light harvesting capacity via a surface cationic displacement strategy, and density functional theory thermodynamically explains the breaking of SbS bonds and formation of CdS bonds according to the bond energy calculation. The SbSCd bonding interaction and van der Waals force significantly enhance the stability and synergy of Sb2S3/CdS heterointerface throughout the entire surface of Sb2S3 NRs, promoting the Sb2S3‐to‐CdS electron transfer due to the formation of built‐in electric field. Therefore, the optimized Sb2S3@CdS catalyst achieves highly enhanced simulated sunlight‐driven Cr(VI) reduction (0.154 min−1) and decomplexation of complexed Cr(III) in weakly acidic condition, resulting effective CCW treatment under co‐action of photoexcited electrons and active radicals. This study provides a high‐performance heterostructured catalyst for effective CCW treatment by SPV technology.

Superstable Mineralization Coupled with Photocatalysis toward Cr(VI) Remediation Using Layered Double Hydroxide Material

“…Generally, Cr(VI) mainly exists in aqueous solution in two forms, namely, Cr 2 O 7 2− (acidic) and CrO 4 2− (basic), 39 in a chemical equilibrium with the concentration depending on the pH. Therefore, it is necessary to investigate the removal efficiency of Cr(VI) in a range of pH values.…”

Coupling Cu Coordination Polymers with CdS Forming an S-Scheme Heterojunction for Rapid Charge Separation and High Photocatalytic Activity

“…When the dosage of CdS was increased by 10 times, the BET surface area of Cu-CPs@CdS-3 synthesized by the same method was significantly reduced to 20 m 2 ·g –1 with a pore size of 18.98 nm (Figure S6). The result showed that nano-CdS could significantly increase the specific surface area of the heterojunction, exposing the most active sites in the photocatalytic reaction, which will be favorable for the adsorption of pollutants and the separation of photogenerated carriers …”

“…The result showed that nano-CdS could significantly increase the specific surface area of the heterojunction, exposing the most active sites in the photocatalytic reaction, which will be favorable for the adsorption of pollutants and the separation of photogenerated carriers. 41 4.2. Spectrum Analysis.…”

Bi/BiOI/carbon quantum dots nano-sheets with superior photocatalysis

“…Photoabsorption capability is an important factor influencing the photocatalytic performance of photocatalysts, 50 and is usually evaluated by UV-vis diffuse reflectance spectra (DRS). As shown in Fig.…”