利用工业块体硅为硅源,CH4为碳源,在含有H2和Ar混合气氛中,采用直流电弧等离子体法制备SiC纳米粒子.CH4含量影响SiC纳米粒子的化学组成和形貌.结果显示:产物中含有3C-SiC和6H-SiC两种物相,而在CH4压力为0.005 MPa条件下制备的SiC纳米粒子还含有Si/SiC核壳结构.利用制备的SiC纳米颗粒作为催化剂,在恒光强下光电催化还原脱除2,4-二氯酚中的Cl原子.结果显示在-1.02 V偏压下光电催化180 min后,对2,4-二氯酚的去除效率达92.5％,SiC纳米粒子的吸附效率为19.6％.因此,SiC纳米颗粒可取代贵金属,作为低成本光电催化候选材料用于污水处理.
SiC nanoparticles were synthesized by direct current (DC) arc-discharge plasma method,using bulk Si as silicon source and in a mixed atmosphere of CH4,H2 and Ar.The chemical composition and morphology of the SiC nano product were affected by the pressure of CH4 obviusly.These products were characterized by Transmission electron microscopy (TEM),Raman spectra,Fourier transform infrared (FTIR) spectroscopy,X-ray diffraction (XRD),and X-ray photoelectron spectroscopy (XPS).The results indicate that the product contains the main phases of 3C-and 6H-SiC,while prepared at low CH4 pressure of 0.005 MPa,which exists few Si/SiC core-shell structures in the product.The SiC nanoparticles,prepared at 0.01 MPa CH4,were used as the catalyst to remove the Cl atoms in persistent 2,4-dichlorophenol through photoelectric catalytic reduction.The results show that the SiC nanoparticles have good photoelectric catalytic reductive dechlorination ability under ultraviolet illumination at a constant optical intensity of 500 mW/cm2.The removal efficiency reaches about 92.5％ and the adsorption efficiency is 19.6％ at an appropriate bias potential of-1.02 V after 180 min of photoelectric catalysis.Hence,SiC nanoparticles are identified as a kind of low-cost photoelectrocatalysis candidates to replace noble metals in wastewater treatments.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%