首页|Photocatalytic abatement of phenol on amorphous TiO2-BiOBr-bentonite heterostructures under visible light irradiation
Photocatalytic abatement of phenol on amorphous TiO2-BiOBr-bentonite heterostructures under visible light irradiation
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NSTL
Elsevier
? 2022 The Korean Society of Industrial and Engineering ChemistryA simplistic solvothermal process to fabricate novel amorphous TiO2-BiOBr-Bentonite (A-TiO2-BiOBr-Bt) multidimensional photocatalysts in this work is a practical and economically feasible technique for the fabrication of the reported photocatalysts as it is a one-pot process. The stickiness of the A-TiO2-BiOBr-Bt wet cake and the low drying temperature make A-TiO2-BiOBr-Bt a feasible platform composite for the fabrication of the photoreactive inner coating of water treatment containers for photocatalytic treatment of drinking water. The A-TiO2-BiOBr-Bt photocatalyst with an A-TiO2:BiOBr:Bt mass ratio of 1:1:2 (Ti1Bi1Bt2) displayed the highest BET surface area of 124.8 m2/g, a low bandgap of 2.86 eV, and sufficiently low electron-hole recombination rate. The high number of A-TiO2-BiOBr p-n heterojunctions, and the Ti-O-Si and Bi-O-Si bonds between A-TiO2-BiOBr and Bt in Ti1Bi1Bt2 lowered its electron-hole recombination rate with enhanced visible light-harvesting ability. Within 70 min of visible light irradiation, 150 mg of Ti1Bi1Bt2 gave 100% conversion of 100 mL of 20 ppm phenol with a pseudo-first-order rate constant of 0.0322 min?1 at pH 4.0. Scavenging experiments showed superoxide radicals (O2??) and electrons (e?) being the most dominant reactive oxidation species (ROS) responsible for the phenol photodegradation process while holes (h+) and hydroxyl radicals (?OH) also exerted appreciable participation.
NSTL
Elsevier
