酸性改性蜂巢石及其对废水中氨氮吸附能力的试验研究  

Acid-modification of Pumice and Inquiry on Adsorption Capacity of Modified Pumice to Ammonia-nitrogen in Wastewater

作　　者：丁琨[1] 徐镇男 张甲[1] 张勇[1] 

机构地区：[1]安徽建筑大学环境与能源工程学院,安徽合肥230601

出　　处：《长江大学学报（自科版）（上旬）》2016年第1期25-29,4,共5页JOURNAL OF YANGTZE UNIVERSITY (NATURAL SCIENCE EDITION) SCI ＆ ENG

基　　金：国家自然科学基金项目(21171004);安徽省自然科学基金项目(KJ2011z059);安徽省教育厅教研项目(2013YX17)

摘　　要：以蜂巢石的比表面积为指标,通过正交试验确定了蜂巢石最佳酸改性条件,并用经最佳酸改性后的蜂巢石对模拟氨氮废水进行吸附试验,探求不同的试验条件对废水中氨氮去除效果的影响,找寻去除氨氮的最佳条件。试验结果表明,在硫酸浓度为0.5mol/L、温度为35℃的条件下,改性30min的蜂巢石比表面积最大,与原蜂巢石相比,比表面积增大了40%左右;对比改性前后样品的SEM电镜扫描结果,改性后的蜂巢石表面更粗糙,孔隙更显著,侵蚀痕迹更明显,更有利于吸附;改性后的蜂巢石对低浓度氨氮具有较强的吸附能力,并具有快速吸附、缓慢平衡的特点,而且对氨氮的吸附行为符合Langmuir和Freundlich吸附等温方程。The specific area of pumice is taken as indicator and then the optimum acid modification conditions of pumice is obtained by orthogonal test.Furthermore,the ammonia-nitrogen removal effect of waste water is explored under various condition and the optimum condition of ammonia-nitrogen removal based on the adsorption test of the optimum acid modified pumice is obtained to ammonia-nitrogen waste water.Experimental results indicate that the pumice modified under the condition of vitriol concentration is 0.5mol/L,35℃ and 30 minutes modification has the largest surface area,which grows about 40%larger than the former.The SEM scanning to the sample before and after modification show that the modified pumice is more beneficial for the adsorption due to the coarser surface,more remarkable hole and more obvious erosion mark.Modified pumice has a strong adsorption capacity to low concentration ammonia-nitrogen and features such as rapid adsorption and slow balance.Furthermore,the adsorption pattern conforms to Langmuir and Freundlich isothermal equation.

关 键 词：蜂巢石 酸性改性 氨氮 吸附 

分 类 号：X703[环境科学与工程—环境工程]