天然有机物对颗粒活性炭吸附微囊藻毒素的影响研究  

Effect of natural organic matters on adsorption of MCLR by GAC

作　　者：阮铃铃[1] 梁文艳[1] 许佳[1] 梁志霞[1] 王金丽[1,2] 

机构地区：[1]北京林业大学环境科学与工程学院,北京100083 [2]中国市政工程华北设计研究院,天津300070

出　　处：《环境污染与防治》2010年第10期57-61,共5页Environmental Pollution & Control

基　　金：国家水体污染控制与治理科技重大专项(No.2008ZX07314-006);国家自然科学基金资助项目(No.50678024);北京林业大学优秀青年教师科技创新专项(No.BLYX200909)

摘　　要：通过改变水体中天然有机物(NOM)、腐殖酸(HA)浓度以及pH,测定了不同条件下颗粒活性炭(GAC)吸附微囊藻毒素MCLR的容量变化,研究了NOM对GAC吸附MCLR的影响。结果表明,GAC吸附MCLR的过程中,低浓度溶液中的吸附速率要高于高浓度溶液,且准一级动力学和准二级动力学方程均能较好地描述GAC吸附MCLR的过程;当溶液中含17.6 mg/LNOM或10.0 mg/L HA时,GAC对MCLR的最大吸附容量从17.06μg/g分别降低至13.68、12.89μg/g;GAC对MCLR的平衡吸附容量(qe)随NOM浓度的升高而逐渐降低,但当溶液中NOM超过一定值时,NOM浓度再升高对GAC吸附MCLR的影响程度变化不大,NOM从10.0 mg/L升高至17.6 mg/L时,qe仅降低了0.31μg/g;在中性或偏碱性水体中,HA对GAC吸附MCLR的干扰相对于酸性水体中更小,通过改变溶液pH来改变HA的带电性,对GAC吸附MCLR的影响总体较小。The batch adsorption of MCLR on granular activated carbon（GAC） were performed in different solution to determine the effect of natural organic matters（NOM）,humic acid（HA） and pH on the adsorptive capacity of GAC.The results showed that the MCLR adsorption reached equilibrium after 24 h.The dynamic adsorption capacity data were well described by both pseudo first and pseudo second order reaction rate model.The Langmuir isotherm model showed that the presented of NOM or HA could decrease the adsorptive capacity of GAC,when the concentration of NOM was 17.6 mg/L or HA was 10.0 mg/L,the maximum adsorption capacity was decreased from 17.06 μg/g to 13.68 or 12.89 μg/g,respectively.However,the influences of organic matters were not obvious when their concentrations above the certain value.The effect of HA on MCLR adsorption by GAC was weaker in neutral or alkaline solution than in acidic solution.

关 键 词：MCLR 颗粒活性炭 天然有机物 腐殖酸 

分 类 号：X173[环境科学与工程—环境科学]