Adsorption behavior and mechanism of ibuprofen onto BiOCl microspheres with exposed {001} facets

Abstract

BiOCl microspheres with exposed {001} facets have been synthesized through a simple solvothermal method. The adsorption and photocatalytic activities of BiOCl microspheres were evaluated by removal of ibuprofen (IBP) as the model reaction. Parameters including IBP concentration, BiOCl dosage, and inorganic ions were investigated to reveal the role of adsorption in BiOCl-based photocatalysis. We found that the high IBP removal rate by BiOCl is not due to photocatalytic oxidation but to surface adsorption. The combination of ICP/MS, IC, XPS, and FT-IR results directly proved that anion exchange between dissociated IBP and Cl accompanied by the formation of surface complex (O-Bi-OOC-CH) onto the BiOCl surface is the main adsorption mechanism. In addition, we also demonstrated that organic compounds with carboxyl group (-COOH) such as diclofenac, benzoic acid, and p-phthalic acid can be adsorbed by BiOCl while organic compounds without carboxyl group such as carbamazepine, nitrobenzene, and p-chloronitrobenzene cannot be adsorbed. We believe that the BiOCl adsorption behavior and mechanism should be considered when discussing its photocatalytic mechanism.

BiOCl-Bi12O17Cl2 nanocomposite with high visible-light photocatalytic activity prepared by an ultrasonic hydrothermal method for removing dye and pharmaceutical

“…As shown in Fig. 6(b), the band gap energy was 3.25, 2.20, and 2.39 eV for BiOCl, Bi12O17Cl2, and the composite respectively, which was similar to previous reports [47,48]. These results indicate that the Bi-OCl-Bi12O17Cl2 composite had a matching energy band position, which was conducive to photocatalytic degradation of organic pollutants under visible-light illumination.…”

Fast Degradation of Monochloroacetic Acid by BiOI-Enhanced UV/S(IV) Process: Efficiency and Mechanism

“…Obviously, the reducibility of photogenerated e − CB on the surface of BiOI was even lower than that of SO 2− 3 (−0.94V [7]), indicating that the role of e − CB was negligible. Our previous research indicated that BiOI showed very weak adsorption of nitrate [24]. Additionally, nitrate reacts with e − aq (k(Nitrate + e − aq ) = 9.7 [26]).…”

Interfacial charge transfer weakens hydrogen bonds between water molecules to accelerate solar water evaporation

“…5g). 40–74 In addition, rGOFpl foam was used to purify the aqueous solution containing the artificial dye Rhodamine B. It was found that the UV vis characteristic peak of Rhodamine B in condensed and collected water at 570 nm disappeared after purification, and the purification efficiency was close to 100% with the color of the solution changing from pink to colorless, as shown in Fig.…”