Synthesis of Au-loaded AgInS 2 nanoparticles with highly enhanced visible light photocatalytic performances
- PDF / 3,270,505 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 105 Downloads / 219 Views
Synthesis of Au-loaded AgInS2 nanoparticles with highly enhanced visible light photocatalytic performances Xuehua Lv1, Hai Lan1, Jie Guo1, Meixian Guo1,*, and Ya Yan1,* 1
College of Pharmacy, Dali University, Dali 671000, Yunnan, China
Received: 29 July 2020
ABSTRACT
Accepted: 21 October 2020
AgInS2 and Au-loaded AgInS2 (denoted as Au/AgInS2) were prepared by onepot method with thioacetamide as sulfur source and mercaptoacetic acid as stabilizer. The structure, morphology, and optical properties of the obtained samples were characterized by XRD, XPS, BET, HRTEM, DLS, PL, and UV–visDRS. The photocatalytic activities of AgInS2 and Au/AgInS2 for the degradation of Rhodamine B (RhB) and 4-Nitrophenol (4-NP) under visible light irradiation were investigated, and the optimal proportions of Au introduced on AgInS2 for the degradation of RhB and 4-NP were obtained. The possible degradation mechanisms of 4-NP by AgInS2 and Au/AgInS2 were proposed based on the active species trapping experiment, optical properties characterization, and the flat potential determination. The results showed that Au was successfully introduced on the surface of AgInS2 nanoparticles, and the photocatalytic degradation efficiencies of Au/AgInS2 toward RhB and 4-NP were higher than those of AgInS2. 5%Au/AgInS2 was the optimal proportion for the degradation of RhB, and the degradation efficiency could reach 98% in 30 min, while 7.5%Au/AgInS2 was the best proportion for the degradation of 4-NP, and the degradation efficiency could reach 100% in 30 min. The enhanced visible light photocatalytic performances of Au/AgInS2 could be attributed to the stronger visible light absorption and the lower recombination probability of photogenerated electron–hole pairs. Active species trapping experiment suggested that the main active species was superoxide radical (O2-) for the degradation of RhB by Au/AgInS2, while for the degradation of 4-NP, the main active species were superoxide radical (O2-) and hydroxyl radical (OH).
Ó
Springer Science+Business
Media, LLC, part of Springer Nature 2020
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10854-020-04730-8
J Mater Sci: Mater Electron
1 Introduction Water is the source of life; however, water pollution is becoming more and more serious with the rapid development of society [1]. Polluting heavy metals, organic matter, and some viruses in water can do great harm to the environment and human beings [2–7]. Presently, water pollutants are usually treated by traditional methods such as physical, chemical, biological, or the combination of these techniques [8, 9]. Physical methods (adsorption, membrane separation, magnetic separation, etc.) have the disadvantages of poor regeneration of adsorbents, bad selectivity, easy clogging of membranes, and high price. The biological method has the disadvantages of unstable effect and poor adaptability. In the past decades, scientists have been attracted by semiconductor photocatalytic technology due to its mild reaction
Data Loading...
