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采用浸渍-煅烧法制备了Mn_xO_y/γ-Al_2O_3纳米颗粒,并考察了Mn_xO_y/γ-Al_2O_3投加量和温度对聚乙烯醇(PVA)模拟废液的吸附及降解效果影响。采用了XRD、SEM-EDS等方法对Mn_xO_y/γ-Al_2O_3纳米颗粒进行表征。实验表明,浸渍-煅烧法可以使Mn元素以锰系氧化物的形式在基本不破坏γ-Al2O3载体性能特征的情况下,均匀负载在γ-Al2O3纳米颗粒上。Mn_xO_y/γ-Al_2O_3纳米颗粒可以通过吸附作用去除PVA模拟废水中PVA大分子,吸附温度的提高和Mn_xO_y/γ-Al_2O_3纳米颗粒投加量的增加会进一步促进Mn_xO_y/γ-Al_2O_3对PVA的吸附。通过正交试验确定了Mn_xO_y/γ-Al_2O_3降解处理PVA的最优方案为:处理质量分数1%的PVA水溶液100mL需投加12mL双氧水,0.45g Mn_xO_y/γ-Al_2O_3,反应温度为80℃,PVA最大去除率为99.38%。
Mn_xO_y / γ-Al_2O_3 nanoparticles were prepared by impregnation-calcination method. The effects of Mn_xO_y / γ-Al_2O_3 dosage and temperature on the adsorption and degradation of polyvinyl alcohol (PVA) wastes were investigated. The Mn_xO_y / γ-Al_2O_3 nanoparticles were characterized by XRD, SEM-EDS and other methods. Experiments show that the impregnation - calcination method can Mn elements in the form of manganese oxide without substantially undermining the γ-Al2O3 carrier performance characteristics of the case, uniformly loaded on the γ-Al2O3 nanoparticles. Mn_xO_y / γ-Al_2O_3 nanoparticles can remove PVA macromolecules in PVA simulated wastewater by adsorption, the adsorption temperature is increased and the addition of Mn_xO_y / γ-Al_2O_3 nanoparticles will further promote the adsorption of PVA by Mn_xO_y / γ-Al_2O_3. Through the orthogonal test, the optimal solution of degrading PVA by Mn_xO_y / γ-Al_2O_3 was determined as follows: 12mL of hydrogen peroxide solution, 0.45g Mn_xO_y / γ-Al_2O_3, 100 ℃ of PVA solution with mass fraction of 1% The maximum removal rate of 99.38%.