负载型Ni/BiOBr可见光催化剂的制备及性能

摘要

利用浸渍水热法将 Ni 负载到 BiOBr 载体上,制备了新型的 Ni/BiOBr 复合光催化剂,考察了水热反应温度和时间对制备催化剂的影响。同时采用XRD、BET、UV-Vis紫外-可见光谱等手段对样品进行了表征,研究了 Ni/BiOBr 在可见光照射下的光催化活性。结果表明,在水热反应温度为160℃,水热反应时间为8h 的条件下,制备的 Ni/BiOBr 纳米材料具有很好的光催化活性,当 Ni 负载到 BiOBr 上时,Ni/BiOBr 在可见光区的吸收带边发生红移,光催化实验表明,在可见光下(λ>420nm)可以有效降解罗丹明B,降解率高达97%,Ni/BiOBr 的晶型结构受反应条件的影响,它的禁带宽度为2.62eV。%Using dipping hydrothermal method make Ni loading to BiOBr carrier,prepared new type Ni/BiOBr composite photocatalyst,the effect of the hydrothermal condition of different reaction time and temperature on the catalyst which prepared was studied,and using XRD,BET,UV-Vis to evaluate the samples,studied photo-catalytic activity of Ni/BiOBr under visible light irradiation.The results show that,in the hydrothermal reac-tion temperature is 160℃,hydrothermal reaction time was 8h conditions,the nanomaterials prepared of Ni/BiOBr having good photocatalytic activity,when Ni loading to BiOBr carrier,Ni/BiOBr has red shift in the visi-ble region of the absorption band edge,photocatalytic experiments show that rhodamine B under visible light (λ>420nm)can be effectively degradated,the degradation rate of up to 97%,the crystal structure of Ni/BiOBr affected by the reaction conditions,its band gap was 2.62eV.