介孔分子筛SBA-15负载MnO_2吸附剂去除水中As(Ⅲ)
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摘要
以介孔分子筛SBA-15为基质负载MnO_2,制备SBA-15/MnO_2复合吸附剂用于水中As(Ⅲ)的去除,利用SEM和XRD等技术对SBA-15/MnO_2进行表征.研究硅锰摩尔比、吸附剂用量、溶液pH、离子强度对As(Ⅲ)去除的影响.结果表明:SBA-15/MnO_2比纯MnO_2具有更好的除砷效果;提高离子强度可以增强对砷的去除效果;溶液pH对吸附影响较大,随着溶液pH的增大,去除率降低; Freundlich模型比Langmuir模型更好地描述SBA-15/MnO_2对As(Ⅲ)的吸附平衡;动力学研究表明,吸附经4 h基本达到平衡,该吸附剂对砷(Ⅲ)的吸附过程可采用准二级动力学方程描述.
The SBA-15/MnO_2 adsorbent was synthesized by the means of loading MnO_2 on the surface of mesoporous molecular sieve SBA-15. The SBA-15/MnO_2 composite adsorbent was characterized by SEM and XRD. The effects of molar ratio of silicon to manganese,dosage of adsorbent, solution pH and ionic strength on the removal of As( Ⅲ) were studied. The results showed that the adsorption of SBA-15/MnO_2 had better arsenic removal effect than pure than MnO_2, increasing ionic strength could enhance the removal of As( Ⅲ). The adsorption was strongly dependent on pH,with the increasing of pH, the removal rate decreased. The pattern of adsorption of As( Ⅲ) with SBA-15/MnO_2 better matched with Freundlich model than Langmuir model. Kinetic studies showed that the adsorption reached equilibrium after 4 h,and the adsorption process could be described by the pseudo-second-order kinetic equation.
The SBA-15/MnO_2 adsorbent was synthesized by the means of loading MnO_2 on the surface of mesoporous molecular sieve SBA-15. The SBA-15/MnO_2 composite adsorbent was characterized by SEM and XRD. The effects of molar ratio of silicon to manganese,dosage of adsorbent, solution pH and ionic strength on the removal of As( Ⅲ) were studied. The results showed that the adsorption of SBA-15/MnO_2 had better arsenic removal effect than pure than MnO_2, increasing ionic strength could enhance the removal of As( Ⅲ). The adsorption was strongly dependent on pH,with the increasing of pH, the removal rate decreased. The pattern of adsorption of As( Ⅲ) with SBA-15/MnO_2 better matched with Freundlich model than Langmuir model. Kinetic studies showed that the adsorption reached equilibrium after 4 h,and the adsorption process could be described by the pseudo-second-order kinetic equation.
引文
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[2]RATNA KUMAR P,CHAUDHARI S,KHILAR KC,et al.Removal of Arsenic from Water by Electrocoagulation[J].Chemosphere,2004,55(9):1245-1252.
[3]BALASUBRAMANIAN N,KOJIMA T,AHMEDBASHA C,et al.Removal of Arsenic from Aqueous Solution Using Electrocoagulation[J].Journal of Hazardous Materials,2009,167(1/3):966-969.
[4]BEESLEY L,MORENO-JIMNEZ E,GOMEZ-EYLESJ L,et al.A Review of Biochars'Potential Role in the Remediation,Revegetation and Restoration of Contaminated Soils[J].Environmental Pollution,2011,159(12):3269-3282.
[5]SHIH M C.An Overview of Arsenic Removal by Pressure-Driven Membrane Processes[J].Desalination,2005,172(1):85-97.
[6]HAN B B,REUNNELLS T,ZIMBRON J,et al.Arsenic Removal from Drinking Water by Flocculation and Microfiltration[J].Desalination,2002,145(1/3):293-298.
[7]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.
[8]姚淑华,贾永锋,汪国庆,等.活性炭负载Fe(Ⅲ)吸附剂去除饮用水中的As(Ⅴ)[J].过程工程学报,2009,9(2):250-256.
[9]EVERETT D H.Manual of Symbols and Terminology for Physicochemical Quantities and Units,AppendixⅡ:Definitions,Terminology and Symbols in Colloid and Surface Chemistry[J].Pure and Applied Chemistry,1972,31(4):578-638.
[10]杨华明,张花,欧阳静,等.介孔材料分形表征的研究进展[J].功能材料,2005,36(4):495-498.
[11]ZHAO D Y,HUO J L,HUO Q S,et al.Triblock Copolymer Syntheses of Mesoporous Silica with Periodic50 to 300 Angstrom Pores[J].Science,1998,279(5350):548-552.
[12]张迎迎,徐玉彬,丁见,等.介孔分子筛的研究进展[J].山东理工大学学报(自然科学版),2013,27(4):34-39.
[13]张涛,董雪,张宗弢.孔道型微孔和介孔分子筛的改性及超级绝热性能[J].高等学校化学学报,2014,35(4):689-694.
[14]张立珠.新生态二氧化锰对水中有机污染物的强化去除作用[D].哈尔滨:哈尔滨工业大学,2008:17.
[15]杨倩.孔洞石墨烯/二氧化锰复合材料的制备及其电化学性质研究[D].西安:陕西师范大学,20147-10.
[16]李槐华,黄晓燕,沈慧庭,等.化学二氧化锰制备及进展评述[J].中国锰业,2014,32(2):1-5.
[17]陈英旭,朱祖祥,何增耀.环境中氧化锰对Cr(Ⅲ)氧化机理的研究[J].环境科学学报,1993,13(1):45-50.
[18]吴志坚,刘海宁,张慧芳.离子强度对吸附影响机理的研究进展[J].环境化学,2010,29(6):997-1003.
[19]丁文成,闫凤冬,赵洪伟,等.饮用水除砷材料吸附特性及影响因素分析[J].环境工程学报,2013,7(3):873-878.
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