鎳鈷雙金屬氧化物催化過硫酸氫鉀效能和機理
[Abstract]:In order to investigate the activation effect of bimetallic catalyst on the strong oxidation activity of PMS (potassium persulfate), acid orange 7 (AO7) was used as the target pollutant. Co-NiO_x (nickel-cobalt bimetallic oxide) catalyst was prepared by sol-gel method (sol-gel method). The activity of Ni-Co catalyst and the factors influencing the degradation of AO7 by PMS were investigated. The reaction mechanism was also discussed. The results show that the effect of Co-NiO_x on PMS oxidation of AO7 is better than that of monometallic catalyst and single oxidation. With the increase of the amount of catalyst, the degradation rate of AO7 increases obviously, and the degradation rate of AO7 increases with the increase of initial concentration of PMS, and 150 渭 mol/L is the best dosage. When the initial concentration of AO7 increased from 32 渭 mol/L to 96 渭 mol/L, the degradation rate of AO7 decreased from 92.5% to 67.07% at 20 min, and the maximum degradation rate of AO7 was 95.02% at about 4 min. The experimental results of free radical inhibitor by adding ethanol (EA) and tert-butanol (TBA) showed that the main oxidant in the oxidation system was SO_4~- (). XPS of sulfate radical showed that Co, in Co-NiO_x catalyst) Ni exists mainly in the form of Co~ (2) and Ni~ (2), and O exists mainly in the form of surface hydroxyl oxygen, adsorbed oxygen and water. The results show that the Co-NiO_x catalyst has good catalytic performance and can effectively activate PMS to produce SO_4~- and OH, to achieve the degradation of pollutants in water.
【作者單位】: 四川大學建筑與環(huán)境學院;
【基金】:國家自然科學基金(51508353) 成都市科技惠民項目(2015-HM01-00279-SF) 大學生創(chuàng)新創(chuàng)業(yè)訓練計劃(201610611024)資助
【分類號】:X703
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