CuO improved energy band of AgO/fibrous SiO2-ZrO2 for optimized simultaneous photocatalytic redox of chromium (VI) and p-cresol using response surface methodology

被引：13
作者：
Aziz, F. F. A. [1 ]
Jalil, A. A. [1 ,2 ]
Hassan, N. S. [1 ]
Fauzi, A. A. [1 ]
Khusnun, N. F. [1 ]
Ali, M. W. [1 ,2 ]
Bahari, M. B. [3 ]
Nabgan, W. [4 ]
机构：
[1] Univ Teknol Malaysia, Fac Chem & Energy Engn, UTM Johor Bahru S81310, Johor, Malaysia
[2] Inst Future Energy, Ctr Hydrogen Energy, UTM Johor Bahru 81310, Johor, Malaysia
[3] Univ Teknol Malaysia, Fac Sci, UTM Johor Bahru 81310, Johor, Malaysia
[4] Univ Rovira & Virgili, Engn Quim, Paisos Catalans 26, Tarragona 43007, Spain
来源：
ENVIRONMENTAL RESEARCH | 2023年 / 220卷
关键词：
Chromium (VI); Fibrous silica zirconia; P-cresol; Photoredox; Ternary photocatalyst; Water treatment; ENHANCED PHOTODEGRADATION; EFFICIENT PHOTOCATALYST; LIGHT; DEGRADATION; REDUCTION; OXIDATION; CR(VI); NANOPARTICLES; NANOPOWDERS; POLLUTANTS;
D O I：
10.1016/j.envres.2022.115151
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Ternary CuO/AgO/FSZr photocatalysts were fabricated via the hydrothermal and electrochemical methods with three different CuO loading (1, 3 and 5 wt%), indicated as 1CuO/AgO/FSZr, 3CuO/AgO/FSZr and 5CuO/AgO/ FSZr. The photocatalytic reaction was tested towards simultaneous chromium (VI) photoreduction and p-cresol photooxidation and the performance in order as follow: 3CuO/AgO/FSZr > 5CuO/AgO/FSZr > 1CuO/AgO/FSZr > AgO/FSZr > FSZr. CuO/AgO/FSZr photocatalysts showed an improvement in photocatalytic activity compared to AgO/FSZr and FSZr due to the reduction potential of chromium (VI) aligned closer to the conduction band of CuO and provided abundant free active electrons (e- ) and holes (h+) with efficient transportation and migration. Interestingly, the 3CuO/AgO/FSZr was established as the best photocatalyst with 98% reduction of chromium (VI) and 83% oxidation ofp-cresol simultaneously, owing to its strong corporation between the metal oxides and support and higher total pore volume. The Langmuir-Hinshelwood model were employed for kinetics which followed the pseudo-first-order kinetics model well. Based on the simultaneous photocatalytic mechanism, chromium (VI) and p-cresol were directly reduced and oxidized by e- and h+, respectively. The response surface methodology (RSM) discovered that the quadratic term initial concentration of chromium (VI) is the main sig-nificant factor in photocatalytic performance. The optimum parameters for simultaneous photoredox of chro-mium (VI) and p-cresol predicted from RSM are 9.6 mg L-1 of chromium (VI) concentration, 9.8 mg L-1 of p -cresol concentration and 0.32 g L-1 of catalyst dosage. Under these conditions the error between the predicted and experimental values is only 3.7%. The 3CuO/AgO/FSZr sustained the photocatalytic performance after reused for five cycles and could oxidized various organic pollutants as well as reduced chromium (VI) simultaneously.
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页数：12
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