Preparation And Catalytic Performance Of Hybrid Catalysts Based On Molybdenum Disulfide

The rapid development of human civilization and industrialization have brought serious issues associated to environmental pollution,especially water pollution.Various nitro compounds were widely produced and manufactured in paper-marking,pharmaceutical and textile industries,which left a large amount of wastewater with a high content of residual pollutants even after the post-treatment by conventional methods.However,many nitro compounds dissolved in water were hardly degraded or self-cleaned by the environment,which posed a direct and long-term toxic threat to amphibians and aquatic organisms such as plants,microbes and animals.Methods to degrade nitro compounds include membrane separation,adsorption,oxidation or catalytic reduction.The catalytic reduction was considered as an effective way for the removal of nitro compounds from wastewaters due to its advantages of simple operation,low cost and high efficiency.In this paper,a hybrid catalyst based on two-dimensional material molybdenum disulfide had been obtained by a simple method.The main contents and conclusions of this paper were as follows:1.The MoS₂ nanosheets were prepared by lithium ion intercalation method,and molybdenum disulfide/poly?N-isopropylacrylamide??MoS₂/PNIPAM?nanocatalyst was prepared by ultrasonic method.The catalytic activities of MoS₂/PNIPAM nanocatalyst were studied using the reduction reaction of 4-nitrophenol?4-NP?to 4-aminophenol?4-AP?as model reaction.Results showed that the MoS₂/PNIPAM nanocatalyst has not only catalytic performance,but also temperature-responsive performance.Furthermore,when temperature went higher than the low critical solution temperature?LCST?of PNIPAM,the MoS₂/PNIPAM nanocatalyst tended to aggregated to form bulk materials from homogeneous suspension.The MoS₂/PNIPAM nanocatalyst returned to dispersed in aqueous solution after the temperature cooled down to the LCST of PNIPAM.2.The molybdenum disulfide/iron oxyhydroxide?MoS₂/FeOOH?catalyst was prepared by a simple hydrothermal method.The structure and morphology of MoS₂/FeOOH catalyst were fully characterized by TEM,FT-IR,XRD and TGA.The catalytic activities of MoS₂/FeOOH catalyst were studied using the reduction reaction of trifluralin as model reaction.It was proved that the catalytic activities of FeOOH can be improved by combining with MoS₂.Results showed that when the content of MoS₂ was 4%,the catalytic reduction rate was obviously increased.The MoS₂/rGO/FeOOH catalyst was also prepared under the same conditions.By comparing the catalytic performance of MoS₂/FeOOH catalyst,it was found that the catalytic reduction rate of MoS₂/rGO/FeOOH catalyst was obviously improved when GO was composited.3.The molybdenum disulfide/bismuth vanadate?MoS₂/BiVO₄?catalyst was prepared by simple condensation reflux method.The structure and morphology of MoS₂/BiVO₄ catalyst were fully characterized by TEM,FT=IR,XRD and XPS.The catalytic activities of the MoS₂/BiVO₄ catalyst were studied using the reduction reaction of trifluralin as model reaction.It was proved that the catalytic activities of BiVO₄ can be improved by combining with MoS₂.Results showed that when the content of MoS₂ was 8%,the rate constant k of MoS₂/BiVO₄ catalyst was 0.03823 min^-1 which was higher than that of BiVO₄(0.02655 min^-1).