不同浓度酸改性对凹凸棒石黏土磷吸附性能的影响
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中国科学院知识创新工程领域前沿项目(ISSASIP0712)、国家重点基础研究发展计划(2007CB109301)、国际植物营养研究所(IPNI)合作项目(Nanjing-10)资助


Effect of acid concentration on phosphate adsorption capacity of acid modified palygorskites
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    摘要:

    比较分析了不同浓度酸改性凹凸棒石黏土对不同程度磷污染水体的吸附净化性能,并初步探讨了酸改性影响凹凸棒石黏土磷吸附性能的作用机制。结果发现,3%~30%酸改性可以不同程度地提高凹凸棒石黏土的磷吸附性能,其中以3%酸改性效果最好,在1%投加量下,其对Ⅴ类(P 0.4 mg L-1)和劣Ⅴ类(P 1.0 mg L-1)水磷的去除率分别达到95%和15%,而原土对磷污染水体基本无吸附净化能力。不同浓度酸改性不同程度地降低了凹凸棒石黏土的pH,可由原土的8.6降至3.86~3.35;3%~30%酸改性凹凸棒石黏土的zeta电位呈折线形变化,其中以3%酸改性凹凸棒石黏土的zeta电位最高,可达到–28.1 mV。结果表明,酸改性可以通过改变凹凸棒石黏土的表面电荷和吸附活性位点等来提高它的磷吸附净化性能,且最适酸改性浓度不超过3%。

    Abstract:

    Phosphate adsorption capacities of palygorskites modified with acid varying in concentration in P-contaminated waters different in phosphate concentration were investigated. And effect of acid modification on the mechanism of palygorskite adsorbing phosphate was also studied through pH and zeta potential measurement. Results showed that acid modification to 3%~30% increased to a varying degree the phosphate adsorption capacity of natural palygorskite,which is actually unable to adsorb any phosphate. The effect of acid modification by 3% was the highest,enabling palygorskite,applied at a rate of 1%,remove 95% of the phosphate from water of Grade V (P 0.4 mg L-1) and 15% from water of Grade Vminus (P 1.0 mg L-1). Acid modification also influenced pH and zeta potential of palygorskite. The former decreased from 8.6 to 3.35,and the latter fluctuated with increasing acid concentration,and peaked up to about -28.1mV when palygorskite was acid-modified by 3%. The results depicted above reveal that acid modification changes surface charge and adsorption sites of palygorskite,thus enhancing its phosphate adsorption or removing capacity.

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干方群,周健民,王火焰,马毅杰,董元华,刘云.不同浓度酸改性对凹凸棒石黏土磷吸附性能的影响[J].土壤学报,2010,47(2):319-324. DOI:10.11766/trxb200802250216 Gan Fangqun, Zhou Jianmin, Wang Huoyan, Ma Yijie, Dong Yuanhua, Liu Yun. Effect of acid concentration on phosphate adsorption capacity of acid modified palygorskites[J]. Acta Pedologica Sinica,2010,47(2):319-324.

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