海藻酸钠/蒙脱石联合负载型纳米Fe~0对Cu(Ⅱ)的去除研究
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摘要
由于蒙脱石负载型纳米Fe~0(Mt-n ZVI)在使用中易随水迁移,造成出水水质混浊和Fe~0流失.因此,本研究制备了海藻酸钠(SA)和蒙脱石(Mt)联合负载型纳米零价铁(SA/Mt-n ZVI),探究其对水中Cu(Ⅱ)的去除效果,并考察了Cu(Ⅱ)初始浓度、pH值对去除率的影响.结果表明:以2%(质量分数)SA和6%(质量分数)Mt-n ZVI条件制备的SA/Mt-n ZVI小球对Cu(Ⅱ)处理效果好,反应24 h后,SA/Mt-n ZVI小球对初始浓度为40 mg·L-1Cu(Ⅱ)的去除率达到92.11%,与游离的Mt-n ZVI颗粒相比,其活性并未降低;Cu(Ⅱ)的去除率随其初始浓度升高而降低;在pH为2~6之间,Cu(Ⅱ)去除率随pH升高而升高.SA/Mt-n ZVI小球可有效净化污水中的Cu(Ⅱ),将其重复使用3次后,对Cu(Ⅱ)的去除率仍维持在59.52%.
Nanoscale zero-valent iron supported on montmorillonite( Mt-n ZVI) is easily washed out in wastewater treatment,causing high effluent turbidity and low iron utilization. In this study,Mt-n ZVI was successfully dispersed on sodium alginate( SA) and was used for efficient removal of Cu( Ⅱ). The effects of initial concentration and p H on Cu( Ⅱ) removal efficiency were studied as well. Results indicate that: 2% SA with 6% Mt-n ZVI was the optimal ratio in Cu( Ⅱ) removal,with efficiency of 92.11% by SA / Mt-n ZVI at 24 hours. Compared to the Mt-n ZVI,the removal was not significantly decreased.In addition,the removal efficiency of Cu( Ⅱ) decreased with the increase of initial Cu( Ⅱ) concentration. Besides,the removal efficiency of Cu( Ⅱ)increased with the p H rising from 2 to 6,and was kept at 59.52% after treatment. Overall,SA / Mt-n ZVI was efficient in Cu( Ⅱ) removal from wastewater.
Nanoscale zero-valent iron supported on montmorillonite( Mt-n ZVI) is easily washed out in wastewater treatment,causing high effluent turbidity and low iron utilization. In this study,Mt-n ZVI was successfully dispersed on sodium alginate( SA) and was used for efficient removal of Cu( Ⅱ). The effects of initial concentration and p H on Cu( Ⅱ) removal efficiency were studied as well. Results indicate that: 2% SA with 6% Mt-n ZVI was the optimal ratio in Cu( Ⅱ) removal,with efficiency of 92.11% by SA / Mt-n ZVI at 24 hours. Compared to the Mt-n ZVI,the removal was not significantly decreased.In addition,the removal efficiency of Cu( Ⅱ) decreased with the increase of initial Cu( Ⅱ) concentration. Besides,the removal efficiency of Cu( Ⅱ)increased with the p H rising from 2 to 6,and was kept at 59.52% after treatment. Overall,SA / Mt-n ZVI was efficient in Cu( Ⅱ) removal from wastewater.
引文
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王清萍,况烨,金晓英,等.2014.海藻酸钙包覆纳米Ni/Fe颗粒用于同时去除水中铜离子和氯苯[J].环境科学学报,34(5):1228-123
杨麒,伍秀琼,钟宇,等.2013.活性炭负载纳米零价铁去除溴酸盐的研究[J].湖南大学学报(自然科学版),40(12):97-102
曾淦宁,武晓,郑林,等.2015.负载纳米零价铁铜藻基活性炭的制备及其去除水中Cr(VI)的研究[J].环境科学,36(2):530-536
Zhang W X.2003.Nanoscale iron particles for environmental remediation An overview[J].Journal of Nanoparticle Research,5(3/4)323-332
Bezbaruah A N,Shanbhogue S S,Simsek S,et al.2011.Encapsulation of iron nanoparticles in alginate biopolymer for trichloroethylene remediation[J].Journal of Nanoparticle Research,13(12):6673-6681
Bhowmick S,Chakraborty S,Mondal P,et al.2014.Montmorillonitesupported nanoscale zero-valent iron for removal of arsenic from aqueous solution:Kinetics and mechanism[J].Chemical Engineering Journal,243:14-23
陈贵英,李维,陈顺德,等.2011.环境铜污染影响及修复的研究现状综述[J].绿色科技,(12):125-128
樊文井,成岳,余淑贞,等.2014.琼脂包裹纳米零价铁的制备及处理废水中Cu(II)试验研究[J].陶瓷学报,35(6):608-612
郭晶晶.2014.蒙脱石/零价铁纳米复合材料修复水体重金属污染效率及机理研究[D].呼和浩特:内蒙古大学
Huang L H,Zhou S J,Jin F,et al.2014.Characterization and mechanism analysis of activated carbon fiber felt-stabilized nanoscale zero-valent iron for the removal of Cr(VI)from aqueous solution[J].Colloids and Surface A:Physicochemical and Engineering Aspects,447:59-66
金晓英,陈征贤,郭飞鹏,等.2013.超声波辅助壳聚糖/零价纳米铁降解酸性品红[J].环境科学学报,33(4):1004-1009
Kim H J,Hong H J,Jung J,et al.2010.Degradation of trichloroethylene(TCE)by nanoscale zero-valent iron(n ZVI)immobilized in alginate bead[J].Journal of Hazardous Materials,176(1/3):1038-1043
康海彦,杨治广,黄晓楠.2015.海藻酸钠/β-环糊精固定化纳米Fe0去除重金属的性能研究[J].环境工程,33(6):144-147
Karabelli D,züm C,Shahwan T,et al.2008.Batch removal of aqueou Cu2+ions using nanoparticles of zero-valent iron:A study of th capacity and mechanism of uptake[J].Industral Engineerin Chemistry Research,47(14):4758-4764
刘凯,庞志华,李小明,等.2011.有机蒙脱石负载纳米铁去除4-氯酚的研究[J].环境科学学报,31(12):2616-2623
雷蕾,李筱琴,殷其亮,等.2013.聚苯乙烯磺酸钠对零价纳米铁表面结构和去除水中As(III)的影响[J].环境科学学报,33(2)408-414
柳听义.2011.包埋型纳米铁(n ZVI)的制备及其去除废水中铬(Cr(VI))的研究[D].天津:天津大学
Liu T Y,Zhao L,Sun D S,et al.2010.Entrapment of nanoscale zero-valen iron in chitosan beads for hexavalent chromium removal from wastewater[J].Journal of Hazardous Materials,184(1/3):724-73
Li X Q,Zhang W X.2007.Sequestration of a metal cations with zerovalen iron nanoparticles-A study with high resolution X-ray photoelectro spectroscopy(HR-XPS)[J].Journal Physical Chemistry C,11(19):6939-6946
吕晓书.2015.稳定化纳米级零价铁的制备及对水中Cr(VI)的去除机制研究[D].杭州:浙江大学
Pang Z H,Yan M Y,Jia X S,et al.2014.Debromination o decabromodiphenyl ether by organo-montmorillonite supporte nanoscale zero-valent iron:Preparation Characterization an influence factors[J].Journal of Environmental Sciences,26(2)483-491
王清萍,况烨,金晓英,等.2014.海藻酸钙包覆纳米Ni/Fe颗粒用于同时去除水中铜离子和氯苯[J].环境科学学报,34(5):1228-123
杨麒,伍秀琼,钟宇,等.2013.活性炭负载纳米零价铁去除溴酸盐的研究[J].湖南大学学报(自然科学版),40(12):97-102
曾淦宁,武晓,郑林,等.2015.负载纳米零价铁铜藻基活性炭的制备及其去除水中Cr(VI)的研究[J].环境科学,36(2):530-536
Zhang W X.2003.Nanoscale iron particles for environmental remediation An overview[J].Journal of Nanoparticle Research,5(3/4)323-332