微波辅助改性稻壳的制备及其对Cd(Ⅱ)的吸附特性
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摘要
以稻壳为基质,在微波辅助条件下对其进行黄原酸化改性,以期强化其对Cd(Ⅱ)的吸附效果。利用扫描电镜(SEM)、傅里叶红外光谱(FTIR)对改性稻壳进行表征。改性稻壳对Cd(Ⅱ)的吸附实验表明:吸附过程符合Langmuir吸附等温线模型和准二级动力学模型,在20 min内可达到对Cd(Ⅱ)的吸附平衡,吸附容量达到150. 95 mg/g。经5次循环再生后,其对镉的吸附容量仍可达到初始值的96. 98%。基于微波辅助制备的黄原酸化改性稻壳原材料来源广、制备时间短、吸附容量高、再生能力强,可用于水体中Cd2+的去除。
In this paper,xanthic acid modification on rice husk was conducted under microwave assistance,in order to strengthen its adsorption effect on Cd( Ⅱ). The modified rice husk was characterized by SEM and FTIR. The Cd( Ⅱ)adsorption on modified rice husk was found to follow Langmuir isotherm model and the pseudo-second-order kinetic model. The modified rice husk could realize adsorption equilibrium of Cd( Ⅱ) within 20 min with the adsorption capacity being up to150. 95 mg/g. After 5 times of cyclic regeneration,it still retained more than 96. 98% of its original adsorption capacity for cadmium. Overall,the xanthic acid modified rice husk prepared under micro-wave assistance has the advantages of abundant raw materials,short preparation time,high adsorption capacity and strong regeneration ability,and it could be used for the elimination of Cd~(2+) from water.
In this paper,xanthic acid modification on rice husk was conducted under microwave assistance,in order to strengthen its adsorption effect on Cd( Ⅱ). The modified rice husk was characterized by SEM and FTIR. The Cd( Ⅱ)adsorption on modified rice husk was found to follow Langmuir isotherm model and the pseudo-second-order kinetic model. The modified rice husk could realize adsorption equilibrium of Cd( Ⅱ) within 20 min with the adsorption capacity being up to150. 95 mg/g. After 5 times of cyclic regeneration,it still retained more than 96. 98% of its original adsorption capacity for cadmium. Overall,the xanthic acid modified rice husk prepared under micro-wave assistance has the advantages of abundant raw materials,short preparation time,high adsorption capacity and strong regeneration ability,and it could be used for the elimination of Cd~(2+) from water.
引文
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[3]Li D W,Ke Y,Meng F.Research progress on heavy metal pollution control and remediation[J].Cheminform,2014,45(13).
[4]刘振东,李贵春,杨晓梅,等.我国农业废弃物资源化利用现状与发展趋势分析[J].安徽农业科学,2012,40(26):13068-13070.
[5]Qu J H,Meng X L,You H,et al.Utilization of rice husks functionalized with xanthates as cost-effective biosorbents for optimal Cd(Ⅱ)removal from aqueous solution via response surface methodology[J].Bioresource Technology,2017,241:1036-1042.
[6]Akhtar M,Iqbal S,Kausar A,et al.An economically viable method for the removal of selected divalent metal ions from aqueous solutions using activated rice husk[J].Colloids&Surfaces BBiointerfaces,2010,75(1):149-155.
[7]Shirzad K,Boris M,Sharon S,et al.Quantum chemical model of an SN2 reaction in a microwave field[J].Journal of Physical Chemistry A,2013,106(37):8516-8524.
[8]Zhu G C,Liu J F,Yin J,et al.Functionalized polyacrylamide by xanthate for Cr(Ⅵ)removal from aqueous solution[J].Chemical Engineering Journal,2016,288:390-398.
[9]Romero-Cano L A,GarcíA-Rosero H,GonzáLez-GutiéRrez L V,et al.Functionalized adsorbents prepared from fruit peels:equilibrium,kinetic and thermodynamic studies for copper adsorption in aqueous solution[J].Journal of Cleaner Production,2017,162:195-204.
[10]Kazemi S Y,Biparva P,Ashtiani E.Cerastoderma lamarcki shell as a natural,low cost and new adsorbent to removal of dye pollutant from aqueous solutions:equilibrium and kinetic studies[J].Ecological Engineering,2016,88:82-89.
[11]Asuquo E D,Martin A D.Sorption of cadmium(Ⅱ)ion from aqueous solution onto sweet potato(Ipomoea batatas L)peel adsorbent:characterisation,kinetic and isotherm studies[J].Journal of Environmental Chemical Engineering,2016,4(4):4207-4228.
[12]程启明,黄青,刘英杰,等.花生壳与花生壳生物炭对Cd(Ⅱ)离子吸附性能研究[J].农业环境科学学报,2014,33(10):2022-2029.
[13]Chen K,He J Y,Li Y L,et al.Removal of cadmium and lead ions from water by sulfonated magnetic nanoparticle adsorbents[J].Journal of Colloid&Interface Science,2017,494:307-316.
[14]Du Z L,Zheng T,Wang P,et al.Fast microwave-assisted preparation of a low-cost and recyclable carboxyl modified lignocellulose-biomass jute fiber for enhanced heavy metal removal from water[J].Bioresource Technology,2016,201:41-49.
[15]Liu D G,Li Z H,Zhu L,et al.Recycled chitosan nanofibril as an effective Cu(Ⅱ),Pb(Ⅱ)and Cd(Ⅱ)ionic chelating agent:adsorption and desorption performance[J].Carbohydrate Polymers,2014,111(1):469-476.
[16]丁洋,靖德兵,周连碧,等.板栗内皮对水溶液中镉的吸附研究[J].环境科学学报,2011,31(9):1933-1941.
[17]李力,陆宇超,刘娅,等.玉米秸秆生物炭对Cd(Ⅱ)的吸附机理研究[J].农业环境科学学报,2012,31(11):2277-2283.
[18]Liang X F,Xu Y M,Sun G H,et al.Preparation and characterization of mercapto functionalized sepiolite and their application for sorption of lead and cadmium[J].The Chemical Engineering Journa,2011,174(1):436-444.
[19]Guo X Y,Du B,Wei Q,et al.Synthesis of amino functionalized magnetic graphenes composite material and its application to remove Cr(Ⅵ),Pb(Ⅱ),Hg(Ⅱ),Cd(Ⅱ)and Ni(Ⅱ)from contaminated water[J].Journal of Hazardous Materials,2014,278:211.
[20]Shen C S,Shen Y,Wen Y Z,et al.Fast and highly efficient removal of dyes under alkaline conditions using magnetic chitosanFe(Ⅲ)hydrogel[J].Water Research,2011,45(16):5200-5210.