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In situ formation of small-scale Ag2S nanoparticles in carbonaceous aerogel for enhanced photodegradation performance

Huihui Hu,Wei Wei,Zhifeng Jiang,Wei Sun,Xiaomeng Lv,Jimin Xie

Published 2019 in Journal of Molecular Liquids

ABSTRACT

Abstract An easy and scalable strategy is introduced to fabricate a series of flexible 3D Ag2S/CA photocatalyst for the degradation of organic dyes and antibiotics. In this design, small-scale Ag2S nanoparticles (NPs) are anchored in a multifunctional carbonaceous aerogel (CA) via in situ ion exchange. The size of the Ag2S NPs is controlled mainly by accurate positioning and adjusting the nucleation. Due to modification with cetyltrimethylammonium chloride (CTAC), the self-seeding nucleation of free Ag+ was avoided by introducing AgNO3 into the solution. The catalytic performance of the Ag2S/CA nanocomposites was evaluated with photodegradable methylene blue (MB) and ciprofloxacin (CIP). The 55 wt% Ag2S/CA nanocomposites exhibited markedly higher photodegradation and mineralization abilities (92% removal rate in 210 min) toward the target pollutants compared with pure Ag2S nanoparticles and the other weight percentage compounds (Ag2S-to-CA). The MB degradation rate of 55 wt% Ag2S/CA was approximately three-fold higher than that of pure Ag2S nanoparticles. Under identical experimental conditions, the degradation process was monitored through UV–Vis absorption spectroscopy, and the degradation pathway of CIP was confirmed by the liquid chromatography–mass spectrometry (LCMS). The stable 3D structure not only improves the adsorption-enrichment capability but also simplifies the separation and recycling processes. The multidimensional mass and electron transfer channels of CA promote the separation and migration of the photogenerated carriers. This study demonstrates a new approach for the preparation of 3D metal sulfide/CA for pollution treatment.

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