Highly stable ?-Bi2O3/Ag decorated nanosilica as an efficient Schottky heterojunction for ciprofloxacin photodegradation in wastewater under LED illumination

被引:37
作者
Graimed, Bassim H. [1 ]
Okab, Ayah A. [1 ,5 ]
Jabbar, Zaid H. [2 ]
Issa, Mohammed Abdullah [3 ]
Ammar, Saad H. [4 ,6 ]
机构
[1] Univ Baghdad, Coll Engn, Environm Engn Dept, Baghdad, Iraq
[2] Al Mustaqbal Univ Coll, Bldg & Construct Tech Engn Dept, Hillah 51001, Iraq
[3] Imam Jaafar Al Sadiq Univ, Coll Adm & Financial Sci, Dept Oil & Gas Econ, Baghdad, Iraq
[4] Al Nahrain Univ, Chem Engn Dept, Baghdad, Iraq
[5] Al Qasim Green Univ, Coll Engn, Babylon 51002, Iraq
[6] Univ Warith Al Anbiyaa, Coll Engn, Karbala, Iraq
关键词
Wastewater purification; Ciprofloxacin degradation; Photocatalysis process; SPR behavior; Schottky heterojunction; Stability investigation; ENHANCED PHOTOCATALYTIC DEGRADATION; ANTIBIOTIC POLLUTION; NANOSHEETS; NANOPARTICLES; OXIDATION; REMOVAL; AG; CONSTRUCTION; PERFORMANCES; FABRICATION;
D O I
10.1016/j.mssp.2022.107303
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A novel mesopours SiO2/beta-Bi2O3/Ag plasmonic heterojunction was first fabricated by a simple multi-step approach. The fabricated heterojunction was applied for ciprofloxacin (CIP) degradation in wastewater. The ternary SiO2/beta-Bi2O3/Ag photocatalyst exhibited a wide absorption in the visible region (400-700 nm) with the assistance of the surface plasmonic resonance (SPR) behavior of Ag0 metal. Furthermore, the experimental results indicated that 96% of CIP was degraded with a TOC removal efficiency of 65% in 105 min under 140 W of lightemitting diode (LED) irradiation. The kinetics studies showed that the degradation rate of SiO2/beta-Bi2O3/Ag is 0.02651 min-1, which is 3.17, 2.62, and 1.99 times higher than that of pure beta-Bi2O3, SiO2/beta-Bi2O3, and beta-Bi2O3/ Ag, respectively. The impacts of operational parameters like solution pH, CIP concentration, and SiO2/beta-Bi2O3/ Ag dosage were also assessed. The trapping experiments suggested that the main reactive species is the center dot OH radical, which can be easily generated on the valence band of beta-Bi2O3. The Schottky heterojunction between beta-Bi2O3 and Ag nanoparticles was well depicted based on trapping tests and characterization techniques. The stability experiments suggested that the SiO2/beta-Bi2O3/Ag nanocomposite possessed high stability in five consecutive cycles and could be applied for CIP removal with acceptable photodegradation performance. Finally, it can be concluded that the nanosilica exhibited an efficient support structure, which can significantly improve the surface properties of SiO2/beta-Bi2O3/Ag by inhibiting the agglomeration effects of beta-Bi2O3/Ag nanoparticles as well as enhance the adsorption and stability of nanocomposite.
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页数:18
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