腐殖酸对粉末活性炭吸附微囊藻毒素的影响研究  

Effect of Humic Acid on PAC's Ability to Adsorb MCLR

作　　者：阮铃铃[1] 梁文艳[1] 梁志霞[1] 隋丽丽[1] 许佳[1] 

机构地区：[1]北京林业大学环境科学与工程学院,北京100083

出　　处：《环境科学与技术》2010年第S1期107-110,共4页Environmental Science & Technology

基　　金：北京林业大学优秀青年教师科技创新专项计划(BLYX200909);国家自然科学基金项目(50678024);国家水体污染控制与治理科技重大专项(2008ZX07314-006)

摘　　要：在测定粉末活性炭(PAC)比表面性质和对微囊藻毒素(MCLR)吸附动力学的基础上,通过改变腐殖酸(HA)浓度、天然有机物(NOM)浓度和溶液pH值,研究HA对PAC吸附MCLR的影响及在NOM影响吸附过程中的作用。结果表明,PAC吸附MCLR的有效孔径容积约占16.7%,对MCLR的吸附在24h后可达平衡。当溶液中含有10.0mg/LHA时,PAC对MCLR的理论单层饱和吸附量qm从64.06μg/g降低至48.16μg/g。溶液中HA和NOM浓度为5mg/L时,平衡吸附量qe从38.47μg/g降至28.14μg/g和33.78μg/g,天然水体中,与其它结构的有机物相比,HA很可能是削弱PAC吸附MCLR能力的主要因素,且随HA和NOM浓度增大,qe降低较缓慢。当pH≥9时,HA对PAC吸附MCLR的影响开始逐渐减小。Basing on measuring the surface chemistry of powder activated carbon(PAC) and adsorption kinetics of PAC to algal toxin MCLR,the effect of humic acid(HA) on PAC adsorption of MCLR in aqueous solution was studied by changing the concentration of HA、NOM and the solution pH. The results showed that about 16.7% of PAC's aperture volume can be adsorbed MCLR and the MCLR adsorption could reach the equilibrium state after 24h. When the solution contained 10.0mg/L HA,the maximum adsorption capacity qm was reduced from 64.06μg/g to 48.16μg/g. The equilibrium adsorption capacity qe decreased from 38.47μg/g to 28.14μg/g and 3.78μg/g when HA and NOM concentration ware 5mg/L in the solution. Compared with other organic matters in the natural water,HA was likely to be the main factor to weaken the adsorption capacity of PAC. The influence of HA on the adsorption was not obvious when its concentration was increased above 5mg/L,and more than NOM with the same concentration. The competitive effect of HA on different solution pH was evaluated and showed that the effect was weaker at the solution pH above 9.

关 键 词：MCLR 粉末活性炭 腐殖酸 

分 类 号：X52[环境科学与工程—环境工程]