采用聚天冬氨酸(PASP)改性碳化稻壳作为新型生物吸附剂对水溶液中铅离子进行吸附,探讨了影响吸附效果的主要因素,并利用Box-Behnken响应面法对吸附条件进行了优化。单因素实验结果表明,溶液pH、脱除时间、吸附剂投加量对铅的吸附产生较大影响。响应面分析法对吸附条件的优化结果表明,当pH=3.5、脱除时间为40min、吸附剂投加量为0.06g时,PASP改性碳化稻壳对铅的吸附效果最好,理论脱除率可达到99.45%,与实测脱除率仅偏差3.73%。研究表明,PASP改性碳化稻壳能显著提高吸附铅的能力和效率。
Rice husk modified by polyaspartic acid (PASP) was used for the removal of lead in aqueous solution.The main factor affecting the removal of lead was discussed and the optimize conditions was investigated using response surface methodology.The experiment results of single factor showed that the solution pH,removal time,and rice husk dosage had great influence on the lead adsorption on rice husk modified by PASP.The experimental results of response surface methodology showed that the maximum percent removal achieved was predicted to be 99.45% under the optimal conditions of 3.5 for pH,0.06g for rice husk dosage,and 40min for removal time.The deviation between predicated removal rate and measured removal rate was only 3.73%.PASP modified rice husk can significantly improve the efficiency and ability of lead adsorbing,and it can be used for the removal of lead from aqueous solution.
[1] Malik R,Dahiya S,Lata S.An experimental and quantum chemical study of removal of utmostly quantified heavy metals in wastewater using coconut husk:a novel approach to mechanism[J].Int J Biol Macromol,2017,98:139-149.
[2] Wang Y,Wang X,Wang X J,et al.Adsorption of Pb(Ⅱ) from aqueous solution to Ni-doped bamboo charcoal[J].J Ind Eng Chem,2013(19):353-359.
[3] 张蕊,葛滢.稻壳基活性炭制备及其对重金属吸附研究[J].环境污染与防治,2011(1):41-45.
[4] 厉悦,李湘洲,刘敏.稻壳基活性炭制备及其对Cr(Ⅵ)的吸附性能[J].江苏农业科学,2010(6):461-463.
[5] 余梅芳,胡晓斌,姚健萍,等.稻壳制活性炭及其对污水中铬的吸附能力研究[J].西北农业学报,2007(1):26-29.
[6] Chuah T G,Jumasiah A,Azni I,et al.Rice husk as a potentially low-cost biosorbent for heavy metal and dye removal:an overview[J].Desalination,2005,175(3):305-316.
[7] 孙楠,田伟伟,张颖,等.碳化稻壳吸附严寒地区村镇地下水中Fe2+与Mn2+的性能分析[J].农业工程学报,2016,32(13):197-205.
[8] Chen H,Guo L W,Cai Y R,et al.Determination of Ni2+ in waters with sodium poly (aspartic acid) as a binding phase in diffusive gradients in thin-films technique[J].Chem Lett,2013,42(4):372-373.
[9] Liu Y J,Chen H,Bai F L,et al.Application of sodium poly (aspartic acid) as a binding phase in the technique of diffusive gradients in thin films[J].Chem Lett,2012,41(11):1471-1472.
[10] Chen H,Guo L W,Zhang M H,et al.Determination of lead in soybean sauces by the diffusive gradients in thin-films technique[J].Food Chem,2014,165:9-13.
[11] 陈宏,张晗,封丽,等.薄膜梯度扩散-石墨炉原子吸收光谱法测定自来水中痕量Cd(Ⅱ)[J].食品科学,2015,36(4):185-188.
[12] 齐敏,谢雯雯,赵金朋,等.玉米芯改性前后对水中重金属去除的研究[J].广东化工,2015,42(24):134-135.
[13] 林芳芳,易筱筠,党志,等.改性花生壳对水中Cd2+和Pb2+的吸附研究[J].农业环境科学学报,2011,30(7):1404-1408.
[14] 苏文鹏,蒋玲玉,杨益琴.过氧化氢氧化改性杉木树皮吸附重金属离子的研究[J].江苏造纸,2015(3):38-40.
[15] 杨娜娜.改性板栗内皮对水溶液中Pb2+和Cd2+的吸附与解析研究[D].保定:河北农业大学,2015.
基金资助
“十二五”国家科技支撑计划(2012BAD29B06);辽宁省科技厅攻关项目(2015103020);泰山学者蓝色产业领军人才团队支撑计划项目[鲁政办字(2015)19号]
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