摘要
研究将酸改性的凹凸棒土与聚合氯化铝(PAC)复配制得PAC-AT吸附材料,对其进行了表征,并用于吸附去除水体中的磷。结果表明,PAC进入或覆盖在凹凸棒土结构内部或在表面发生复合反应。PAC-AT材料通过主要起吸附作用的AT与主要起电中和与起架桥网捕作用的铝离子协同作用来去除水体中的磷。PAC-AT对磷的最大吸附量为13.27 mg/g,符合准2级动力学方程,其最大理论平衡吸附量为12.33 mg/g。pH=4时,PAC-AT对磷的吸附量最大,当酸性增强或者碱性增强,PAC-AT对磷的吸附量均降低,强酸尤为显著。
The PAC-AT adsorption material was prepared by acid modified attapulgite(AT) and polyaluminum chloride(PAC). The material was characterized and used to adsorb phosphorus from aqueous solution. The results showed that PAC entered or covered the structure of AT and the composite reaction took place on the surface of AT structure. PAC-AT materials removed phosphorus from aqueous solution mainly by synergistic effect between the adsorption of AT and the charge neutralization, bridging and netting of aluminum ions. The maximum adsorption capacity of phosphorus by PAC-AT was 13.27 mg/g, the adsorption was fitted by pseudo second-order kinetic model and the maximum theoretical equilibrium adsorption capacity was 12.33 mg/g.The adsorption capacity of phosphorus by PAC-AT was the largest when pH was 4. When the acidity or alkalinity enhanced, the adsorption amount of phosphorus by PAC-AT decreased, especially the strong acid.
引文
[1]孟顺龙,裘丽萍,陈家长,等.污水化学沉淀法除磷研究进展[J].中国农学通报,2012,8(35):264-268.
[2]吕秀彬,杨志宏,付佳,等.铝盐化学除磷对SBR工艺生物脱氮除磷的影响[J].水处理技术,2016,42(6):59-63.
[3]马玉萍,陈立爱,叶勇,等.硫酸亚铁用于污水厂二沉池出水化学除磷[J].环境工程学报,2015(3):1303-1307.
[4]潘理黎,王玲,郑海军,等.城镇污水处理厂尾水深度化学除磷试验研究[J].水处理技术,2011,37(6):50-53.
[5]杨小杰.复配改性黏土的制备及其与凤眼莲在水体修复中的应用[D].南京:南京理工大学,2016.
[6]李晓燕,吸附法除磷技术发展[J].中国高新区,2017(10):13-14.
[7]胡文华,吴慧芳,徐明,等.聚合氯化铝污泥对磷的吸附动力学及热力学[J].环境工程学报,2011,5(10):2287-2292.
[8]李柏林,梁亚楠,张程琛,等.粉煤灰-铝土矿改性制备铝铁复合混凝剂的除磷性能及混凝机理研究[J].环境科学学报,2016,36(7):2503-2511.
[9]吴鹏,陆爽君,徐乐中,等.改性沸石湿地脱氮除磷效能及机制[J].环境科学,2017,38(2):580-588.
[10] RAZALI M, ZHAO Y Q, BRUEN M. Effectiveness of a drinkingwater treatment sludge in removing different phosphorus species from aqueous solution[J].Separation&Purification Technology,2007,55(3):300-306.
[11]余荣台,冯杰,等.改性凹凸棒土对废水脱氮除磷研究[J].陶瓷学报,2016,37(5):531-535.
[12]石万里,赵泽华,叶飞,等.酸改性凹凸棒土处理含铜废水的试验研究[J].环境工程技术学报,2018(2):169-175.
[13]马宏瑞,韩晓晶,王家宏.有机改性凹凸棒土对腐殖酸的吸附性能研究[J].离子交换与吸附,2012,28(1):46-53.
[14]莫立焕,鲁礼成,徐峻,等.凹凸棒土热改性对造纸法烟草薄片废水处理的研究[J].纸和造纸,2013,32(6):68-71.
[15]代伟伟,刘义新.安徽明光凹凸棒土盐酸改性前后的矿物学特征及其孔结构[J].矿物学报,2005,25(4):393-398.
[16] FU Y, WANG Y Z. An organic-inorganic hybrid coagulant containing Al, Zn and Fe(HOAZF):preparation, efficiency and mechanism of removing organic phosphorus[J].Journal of Water Reuse and Desalination,2018,8(2):202-213.
[17]方晖,张易培,陈丁丁,等.净水厂聚合氯化铝铁污泥对污水中磷的吸附作用[J].工业用水与废水,2013,44(3):17-20.