Abstract
Herein, MoS2/TiO2 nanobelts heterojunction have been successfully synthesized by in situ growth method for photocatalytic reduction of Cr(VI). TiO2 nanobelts (NBs) with rough surface were prepared firstly by acidic treatment process, which is beneficial for deposition and growth of MoS2 to form heterojunctions. As a result of special energy level offset and nanostructure, MoS2/TiO2 NBs composite were endowed with higher light-harvesting capacity and charge transportation efficiency, which are indispensible merits for excellent photocatalytic activity. The photocatalytic reduction of Cr(VI) reveals that the synthesized MoS2/TiO2 NBs composite have superior photocatalytic ability than other samples. Meanwhile, a photoreduction mechanism is proposed based on the systematic investigation, where the photogenerated electrons are demonstrated as the dominant reductive species to reduce Cr(VI) to Cr(III).
Highlights
Hexavalent chromium (Cr(VI)) is a common heavy metal pollutant in the wastewater, which has attracted considerable attention around the world owing to its high toxicity and strong carcinogenic activity for humans and living things in nature [1–3]
As a result of special energy level offset and nanostructure, MoS2 /TiO2 NBs composite were endowed with higher light-harvesting capacity and charge transportation efficiency, which are indispensible merits for excellent photocatalytic activity
A photoreduction mechanism is proposed based on the systematic investigation, where the photogenerated electrons are demonstrated as the dominant reductive species to reduce
Summary
Hexavalent chromium (Cr(VI)) is a common heavy metal pollutant in the wastewater, which has attracted considerable attention around the world owing to its high toxicity and strong carcinogenic activity for humans and living things in nature [1–3]. Layered MoS2 is often used as an effective cocatalyst in photocatalytic or electrocatalytic hydrogen evolution reactions due to its large surface area and high electrical conductivity [25–27]. These studies demonstrate that the incorporation of layered MoS2 with a metal oxide can strongly promote visible light harvest ability and separation efficiency of excited charges and photocatalytic activity. As a result of special energy level offset and nanostructure, MoS2 /TiO2 NBs composite were endowed with higher light-harvesting capacity and charge transportation efficiency, which are indispensible merits for excellent photocatalytic activity.
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