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采用浸渍-液相还原-还原沉淀法制备负载型的复合Pd-n ZVI/GAC材料,利用扫描电镜(SEM)、氮吸附比表面积孔径测定仪(BET)对材料进行表征,以亚甲基蓝为目标污染物,考察复合Pd-n ZVI/GAC材料的化学性能。结果表明,纳米Fe(n ZVI)和Pd负载质量分数分别为5%和0.3%时,亚甲基蓝去除效果最好。当亚甲基蓝初始质量浓度为100 mg/L、材料投加量为0.5 g/L条件下,反应10 min后,亚甲基蓝的去除率高达到93.17%;降解动力学数据表明,复合Pd-n ZVI/GAC对亚甲基蓝的降解过程符合1级反应动力学规律,表观速率常数k随着亚甲基蓝的初始含量的增大而减小。
The supported composite Pd-n ZVI / GAC materials were prepared by impregnation-liquid reduction-reduction precipitation method. The materials were characterized by scanning electron microscopy (SEM) and nitrogen adsorption specific surface area analyzer (BET) The chemical properties of Pd-n ZVI / GAC composites were investigated. The results show that methylene blue has the best removal efficiency when nano-Fe (n ZVI) and Pd loading mass fraction are 5% and 0.3%, respectively. When the initial concentration of methylene blue was 100 mg / L and the dosage of material was 0.5 g / L, the removal rate of methylene blue was up to 93.17% after 10 min reaction. The degradation kinetics data showed that the complex Pd-n ZVI / GAC The degradation of methylene blue was in accordance with the first order reaction kinetics. The apparent rate constant k decreased with the increase of the initial content of methylene blue.