摘要
采用直接合成法制备了负载型Co/SBA-15催化剂,采用XRD,XPS,TEM,N_2吸附-脱附等手段对Co/SBA-15进行表征;考察了催化剂用量、Na HCO_3和H_2O_2的浓度及体系p H对Co/SBA-15催化降解亚甲基蓝性能的影响,并探讨了亚甲基蓝催化降解的机理。表征结果显示,Co/SBA-15具有载体SBA-15分子筛的典型介孔结构,孔分布均匀,Co/SBA-15的平均孔径、比表面积和孔体积分别为3.44 nm、475.33 m^2/g和0.27 cm^3/g。实验结果表明,在p H=9、Na HCO_3和H_2O_2浓度分别为10 mmol/L和30 mmol/L、催化剂用量为0.015 g、35℃下反应2 h,50 m L的25 mg/L亚甲基蓝的降解率可达86.48%。催化剂在Co+Na HCO_3+H_2O_2体系中产生碳酸盐自由基,形成了更多的活性氧自由基,提高了对亚甲基蓝的降解性能。
Co/SBA-15 catalyst was prepared through direct synthesis and was characterized by means of XRD, XPS, TEM and N2 adsorption-desorption. The results indicated that the Co/SBA- 15 catalyst kept the typical mesoprous structure of the SBA-15 support. The pore distribution on the catalyst was uniform with average pore diameter of 3.44 nm, specific surface area of 475.33 m2/ g and pore volume of 0.27 cm3/g. The effects of catalyst dosage, NaHCO3 concentration, H202 concentration and pH of the system on the catalytic degradation of methylene blue were investigated. The mechanism of the catalytic degradation was studied. The results showed that the degradation rate of methylene blue could reach 86.48% under the conditions of methylene blue with the concentration of 25 mg/L 50 mL, pH 9, NaHCO3 concentration 10 mmol/L, H2O2 concentration 30 mmol/L, catalyst dosage 0.015 g, 35 ℃ and 2 h. In the Co＋NaHCO3＋H2O2 solution system, carbonate free radicals generated on the Co/SBA-15 catalyst and then active oxygen free radicals formed, which led to the improvement of the degradation of methylene blue.
出处
《石油化工》
CAS
CSCD
北大核心
2016年第1期85-90,共6页
Petrochemical Technology
基金
齐齐哈尔市工业攻关项目(GYGG-201308)
