以硅藻土为主要原料,添加适量烧结助剂,采用干式研磨、滚球成型和高温煅烧工艺,制备硅藻土基多孔陶粒。硅藻土基多孔陶粒单独吸附1 L 10 mg/L对苯醌时的最佳用量为10 g,其去除率为9.55%。单独采用Fenton法降解对苯醌时,Fe SO_4(50 mmol...以硅藻土为主要原料,添加适量烧结助剂,采用干式研磨、滚球成型和高温煅烧工艺,制备硅藻土基多孔陶粒。硅藻土基多孔陶粒单独吸附1 L 10 mg/L对苯醌时的最佳用量为10 g,其去除率为9.55%。单独采用Fenton法降解对苯醌时,Fe SO_4(50 mmol/L)的最佳投加量为8 m L,H_2O_2(100 mmol/L)为40 m L,最佳pH值为5,此时去除率为59.89%。将硅藻土基多孔陶粒与Fenton法联用,结果表明,二者有明显的协同作用,去除率增至70.29%,较单独采用硅藻土基多孔陶粒增加了6.36倍,较单独采用Fenton法增加了17.4%。同时研究了对苯醌在硅藻土基多孔陶粒与Fenton法联用条件下的吸附动力学行为。对苯醌在硅藻土基多孔陶粒与Fenton法联用条件下吸附速率加快,且吸附去除大部分发生在反应初始阶段60 min内,Elovich和双常数动力学模型能较好地对试验数据进行非线性拟合。展开更多
In order to greatly improve adsorption capacity, the diatomite was pillared by polyhydroxyl-aluminum.A series of adsorption tests were conducted to obtain the optimum condition for pillared diatomite synthesis. The sc...In order to greatly improve adsorption capacity, the diatomite was pillared by polyhydroxyl-aluminum.A series of adsorption tests were conducted to obtain the optimum condition for pillared diatomite synthesis. The scanning electron microscopy （SEM）, Fourier transform infrared spectroscopy （FTIR）, surface area and porosity analyzer and micro-electrophoresis were used to determine pore structure and surface property.The pillared diatomite attaining the optimal adsorption densities （qe） of Pb^2＋ and Cd^2＋ was synthesized with the following conditions： Addition of pillaring solution containing Al3＋-oligomers with a concentration range of 0.1-0.2 mol/L to a suspension containing Na＋-diatomite to obtain the required Al/diatomite ratio of 10 mmol/g; synthesis temperature of 80 ℃ for 120 min; aging at a temperature of 105 ℃ for 16 h. The adsorption capacities of Pb^2＋ and Cd^2＋ on pillared diatomite increase by 23.79% and 27.36% compared with natural diatomite, respectively. The surface property of pillared diatomite is more favorable for ion adsorption than natural diatomite. The result suggests that diatomite can be modified by pillaring with polyhydroxyl-aluminum to improve its adsorption properties greatly.展开更多
文摘以硅藻土为主要原料,添加适量烧结助剂,采用干式研磨、滚球成型和高温煅烧工艺,制备硅藻土基多孔陶粒。硅藻土基多孔陶粒单独吸附1 L 10 mg/L对苯醌时的最佳用量为10 g,其去除率为9.55%。单独采用Fenton法降解对苯醌时,Fe SO_4(50 mmol/L)的最佳投加量为8 m L,H_2O_2(100 mmol/L)为40 m L,最佳pH值为5,此时去除率为59.89%。将硅藻土基多孔陶粒与Fenton法联用,结果表明,二者有明显的协同作用,去除率增至70.29%,较单独采用硅藻土基多孔陶粒增加了6.36倍,较单独采用Fenton法增加了17.4%。同时研究了对苯醌在硅藻土基多孔陶粒与Fenton法联用条件下的吸附动力学行为。对苯醌在硅藻土基多孔陶粒与Fenton法联用条件下吸附速率加快,且吸附去除大部分发生在反应初始阶段60 min内,Elovich和双常数动力学模型能较好地对试验数据进行非线性拟合。
基金Project(12JJ8016)supported by the Hunan Provincial Natural Science Foundation of ChinaProject(CX2012B317)supported by Hunan Provincial Innovation Foundation For Postgraduate,ChinaProject(2006180)supported by the Hunan Key Discipline Construction Found of Environmental Science,China
文摘In order to greatly improve adsorption capacity, the diatomite was pillared by polyhydroxyl-aluminum.A series of adsorption tests were conducted to obtain the optimum condition for pillared diatomite synthesis. The scanning electron microscopy （SEM）, Fourier transform infrared spectroscopy （FTIR）, surface area and porosity analyzer and micro-electrophoresis were used to determine pore structure and surface property.The pillared diatomite attaining the optimal adsorption densities （qe） of Pb^2＋ and Cd^2＋ was synthesized with the following conditions： Addition of pillaring solution containing Al3＋-oligomers with a concentration range of 0.1-0.2 mol/L to a suspension containing Na＋-diatomite to obtain the required Al/diatomite ratio of 10 mmol/g; synthesis temperature of 80 ℃ for 120 min; aging at a temperature of 105 ℃ for 16 h. The adsorption capacities of Pb^2＋ and Cd^2＋ on pillared diatomite increase by 23.79% and 27.36% compared with natural diatomite, respectively. The surface property of pillared diatomite is more favorable for ion adsorption than natural diatomite. The result suggests that diatomite can be modified by pillaring with polyhydroxyl-aluminum to improve its adsorption properties greatly.
