Efficient piezo-assisted near-infrared-light-driven Cr(Ⅵ)reduction over Bi_(2)S_(3) nanowires transformed from ultrathin Bi_(2)WO_(6) nanosheets

The utilization of piezo-photocatalytic technol ogy for environmental remediation under full spectrum solar light is promising but still challenging.Herein,one dimensional Bi_(2)S_(3)nanowires,which can utilize both mechanical energy and near-infrared(NIR)light to remov hexavalent chromium(Cr(Ⅵ))efficiently,were synthe sized by a restrained growth method.The reaction rat constants of Cr(Ⅵ)reduction in piezo-photocatalyti process under NIR(800–2500 nm)reached 0.334 min^(-1)which were 3.2 and 12.4 times as that of single piezo and photocatalytic process.The formation of polarized electri fields and one-dimensional structure allow ultrafast sepa ration of charge carriers,thereby promoting the catalyti activity.Furthermore,due to the strong penetrability o NIR light,the piezo-photocatalysis performance in turbid solutions under NIR light(0.188 min^(-1))was even com parable to that under visible light(0.186 min^(-1)).Thi study provides a new concept on the development of piezo photocatalytic technology for environmental remediation by utilization of NIR light and natural mechanical energy.

Ultrafast photocatalytic degradation of nitenpyram by 2D ultrathin Bi2WO6:mechanism,pathways and environmental factors

As a common insecticide,nitenpyram(NTP)seriously threatens the human health and environmental safety.In this work,a visible-light-responsive photocata-lyst two-dimensional(2D)Bi_(2)WO_(6) was synthesized and applied to degrade NTP.Compared with bulk Bi_(2)WO_(6),the 2D Bi_(2)WO_(6)exhibits better photocatalytic performance for NTP degradation under visible-light irradiation.The enhanced activity can be ascribed to the unique 2D struc-ture which would induce to higher efficiency of carrier separation.Moreover,hole(h+)plays a major role(and·O^(2-))in the degradation of NTP.Based on the interme-diates detected by high-performance liquid chromatogra-phy-mass spectrometry(HPLC-MS),the degradation pathway of NTP was proposed.In addition,the influence of typical environmental factors(pH,water matrix,inorganic cations and common anions)on the degradation of NTP was also investigated.This work not only helps people to understand the degradation of pesticides in actual water bodies,but also provides reference for the subsequent treatment of agricultural wastewater.