Acetic acid-assisted fabrication of hierarchical flower-like Bi₂O₃ for photocatalytic degradation of sulfamethoxazole and rhodamine B under solar irradiation

TY - JOUR

T1 - Acetic acid-assisted fabrication of hierarchical flower-like Bi2O3 for photocatalytic degradation of sulfamethoxazole and rhodamine B under solar irradiation

AU - Bao, Yueping

AU - Lim, Teik Thye

AU - Zhong, Ziyi

AU - Wang, Rong

AU - Hu, Xiao

N1 - Publisher Copyright: © 2017

PY - 2017/11/1

Y1 - 2017/11/1

N2 - With the assistance of acetic acid (CH3COOH), a novel 3D flower-like Bi2O3 was synthesized via hydrothermal process followed by calcination. For the first time, the role of CH3COOH as a capping agent in the formation of flower-like structure was investigated. The as-prepared flower-like Bi2O3 had a high activity on the degradation of sulfamethoxazole (SMX) under simulated solar light irradiation due to the narrow band gap of 2.69 eV, high percentage of β-Bi2O3 as well as high intensity of polar facets (1 2 0) and (2 0 0). Meanwhile, the photocatalytic degradation followed apparent pseudo-first-order kinetics. The rate constant (k) increased from 0.7 × 10−2 to 3.0 × 10−2 min−1 with the catalyst loading varying from 0.5 to 2.0 g L−1. Increasing pH values from 3 to 11 led to the decrease of k from 2.2 × 10−2 to 0.2 × 10−2 min−1, which could be attributed to the electrostatic adsorption between SMX molecules and Bi2O3. The radical quenching experiments showed both direct (h+) and indirect oxidation (OH and O2 -) happened in this process.

AB - With the assistance of acetic acid (CH3COOH), a novel 3D flower-like Bi2O3 was synthesized via hydrothermal process followed by calcination. For the first time, the role of CH3COOH as a capping agent in the formation of flower-like structure was investigated. The as-prepared flower-like Bi2O3 had a high activity on the degradation of sulfamethoxazole (SMX) under simulated solar light irradiation due to the narrow band gap of 2.69 eV, high percentage of β-Bi2O3 as well as high intensity of polar facets (1 2 0) and (2 0 0). Meanwhile, the photocatalytic degradation followed apparent pseudo-first-order kinetics. The rate constant (k) increased from 0.7 × 10−2 to 3.0 × 10−2 min−1 with the catalyst loading varying from 0.5 to 2.0 g L−1. Increasing pH values from 3 to 11 led to the decrease of k from 2.2 × 10−2 to 0.2 × 10−2 min−1, which could be attributed to the electrostatic adsorption between SMX molecules and Bi2O3. The radical quenching experiments showed both direct (h+) and indirect oxidation (OH and O2 -) happened in this process.

KW - Acetic acid

KW - Degradation mechanism

KW - Flower-like BiO

KW - Growth mechanism

KW - Photocatalytic activity

UR - http://www.scopus.com/inward/record.url?scp=85020908859&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2017.05.070

DO - 10.1016/j.jcis.2017.05.070

M3 - 文章

C2 - 28645033

AN - SCOPUS:85020908859

SN - 0021-9797

VL - 505

SP - 489

EP - 499

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

ER -