水泥多孔材料及Cr(Ⅲ)动态吸附性能研究
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摘要
以预制泡沫法制备干密度为400 kg/m~3的水泥多孔材料,并将其作为吸附剂,采用动态吸附法研究了吸附柱高度、初始浓度以及液体流速对模拟废水中Cr(Ⅲ)的吸附性能影响,结果表明:吸附柱高度为19 cm时,去除质量达到607 mg;初始浓度为85 mg/L时,吸附效率为81. 07%;溶液的流速为7. 5 m L/min时,去除Cr(Ⅲ)的量为607 mg,吸附效率为76. 93%; Thomas模型拟合证明水泥多孔材料对Cr(Ⅲ)的动态吸附过程中,吸附剂外表面扩散和内扩散不是反应的速率控制步骤。可见水泥多孔材料对Cr(Ⅲ)具有较好的吸附效果。
Cement-based porous materials( CPM) with dry density of 400 kg/m~3 were prepared by using prefabricated foams,which would be used to absorbent,the factors of adsorption column height,initial Cr( Ⅲ) concentration and the flow rate on adsorption performance of CPM for Cr( Ⅲ) in simulation wastewater was evaluated through dynamic adsorption method. The result shows that the removal quality reaches 607 mg when the height of the adsorption column is 19 cm. In addition,the adsorption efficiency is 81. 07% while the initial concentration is 85 mg/L. The removal of heavy metal Cr( Ⅲ) is 607 mg with 7. 5 m L/min flow rate of the solution and the adsorption efficiency is 76. 93%,the Thomas model fitting proves that the outer surface diffusion and internal diffusion of the adsorbent is not the ratecontrolling step of the reaction during the dynamic adsorption of Cr( Ⅲ) by the CPM. It can be seen that the CPM has a superior adsorption effect on Cr( Ⅲ).
Cement-based porous materials( CPM) with dry density of 400 kg/m~3 were prepared by using prefabricated foams,which would be used to absorbent,the factors of adsorption column height,initial Cr( Ⅲ) concentration and the flow rate on adsorption performance of CPM for Cr( Ⅲ) in simulation wastewater was evaluated through dynamic adsorption method. The result shows that the removal quality reaches 607 mg when the height of the adsorption column is 19 cm. In addition,the adsorption efficiency is 81. 07% while the initial concentration is 85 mg/L. The removal of heavy metal Cr( Ⅲ) is 607 mg with 7. 5 m L/min flow rate of the solution and the adsorption efficiency is 76. 93%,the Thomas model fitting proves that the outer surface diffusion and internal diffusion of the adsorbent is not the ratecontrolling step of the reaction during the dynamic adsorption of Cr( Ⅲ) by the CPM. It can be seen that the CPM has a superior adsorption effect on Cr( Ⅲ).
引文
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[4]肖轲,徐夫元,降林华,等.含Cr(Ⅵ)废水处理研究进展[J].北京师范大学学报(自然科学版),2016,52(1):76-82.
[5]胡芳,刘俊男,郭雪莲,等.季铵型壳聚糖插层蒙脱土的制备及对Cr(Ⅵ)吸附作用的研究[J].电镀与精饰,2016,38(11):6-10.
[6]张帆,李菁,谭建华,等.吸附法处理重金属废水的研究进展[J].化工进展,2013,32(11):2749-2756.
[7]段建菊,鲁秀国,黄林长,等.磁性吸附材料的制备及其在水处理中的应用研究[J].现代化工,2016,36(11):15-20.
[8]吴艳,罗汉金,王侯,等.改性石墨烯对水中亚甲基蓝的吸附性能研究[J].环境科学,2013,34(11):4333-4340.
[9]杨胜韬,赵连勤.石墨烯吸附材料的制备与应用研究进展[J].西南民族大学学报(自然科学版),2014,40(2):203-218.
[10]吴日良,刘云芳,任森,等. Fe3O4碳/氧化石墨烯复合材料制备及染料吸附性能[J].中国环境科学,2016,36(10):2981-2987.
[11]杨建奎.基于普通水泥制备多孔吸声材料的研究[D].成都:西南交通大学,2014.
[12]任先艳,张玉荣,刘才林,等.泡沫混凝土的研究现状与展望[J].混凝土,2011(2):139-144.
[13]赵军.天津西站公交车场轻质泡沫混凝土换填工程设计及应用[J].国防交通工程与技术,2015(3):74-80.
[14]张斌,许金余,李乐,等.泡沫混凝土回填层在地下复合结构中的抗爆特性分析[J].四川建筑科学研究,2010(6):135-138.
[15]孙婧,刘宏波,李雪鸣.泡沫掺量对泡沫混凝土孔结构及铅离子吸附性的影响[J].硅酸盐通报,2018,37(2):476-482.