Tungsten-based nanocatalysts with different structures for visible light responsive photocatalytic degradation of bisphenol A

摘要

Environmental pollution,such as water contamination,is a critical issue that must be absolutely addressed.Here,three different morphologies of tungsten-based photocatalysts （WO3nanorods,WO3/WS2nanobricks,WO3/WS2nanorods） are made using a simple hydrothermal method by changing the solvents （H2O,DMF,aqueous HCl solution）.The as-prepared nanocatalysts have excellent thermal stability,large porosity,and high hydrophilicity.The results show all materials have good photocatalytic activity in aqueous media,with WO3/WS2nanorods （NRs） having the best activity in the photodegradation of bisphenol A （BPA） under visible-light irradiation.This may originate from increased migration of charge carriers and effective prevention of electron–hole recombination in WO3/WS2NRs,whereby this photocatalyst is able to generate more reactive·OH and·O2–species,leading to greater photocatalytic activity.About 99.6%of BPA is photodegraded within 60 min when using 1.5 g/L WO3/WS2NRs and 5.0 mg/L BPA at pH 7.0.Additionally,the optimal conditions （pH,catalyst dosage,initial BPA concentration） for WO3/WS2NRs are also elaborately investigated.These rod-like heterostructures are expressed as potential catalysts with excellent photostability,efficient reusability,and highly active effectivity in different types of water.In particular,the removal efficiency of BPA by WO3/WS2NRs reduces by only 1.5%after five recycling runs and even reaches 89.1%in contaminated lake water.This study provides promising insights for the nearly complete removal of BPA from wastewater or different water resources,which is advantageous to various applications in environmental remediation.