作 者：
干方群;周健民;王火焰;马毅杰;董元华;刘云
单 位：
土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所)
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(P0·4mgL-1)和劣Ⅴ类(P1·0mgL-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-28·1mV。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%。
译 名：
EFFECT OF ACID CONCENTRATION ON PHOSPHATE ADSORPTION CAPACITY OF ACID MODIFIED PALYGORSKITES
作 者：
Gan Fangqun1,3 Zhou Jianmin1 Wang Huoyan1 Ma Yijie1 Dong Yuanhua1,2 Liu Yun1,2(1 State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China)(2 Joint Open Laboratory of Soil and the Environment,Institute of Soil Science and Hongkong Baptist University,Nanjing 210008,China)(3 Graduate University of Chinese Academy of Sciences,Beijing 100049,China)
关键词：
Acid modified;Adsorption;Palygorskite;Phosphate
摘 要：
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.
