摘要
针对重金属污染和农业固体废弃物资源化问题,利用平菇菌糠作为吸附剂对废水中Cu2+吸附性能进行研究.通过单因素实验测定pH、吸附时间、温度、Cu2+初始浓度对吸附效果的影响;利用扫描电镜-能谱、红外光谱和X射线衍射对其吸附机制进行了初步探究.结果表明,菌糠浓度为10 g·L-1,pH为6,吸附时间为120 min,吸附温度为30℃,铜离子初始浓度为8mg·L-1的条件下,吸附率可达到74.46%,吸附容量为0.744 6 mg·g-1.实验数据较好地吻合Langmuir吸附等温模型,其相关系数为0.994 9,表明吸附过程主要为单层化学吸附.扫描电镜-能谱、红外光谱和X射线衍射分析显示,平菇菌糠吸附Cu2+过程主要为物理吸附和化学吸附,包括静电吸附、络合和配位等反应,其中起主要作用的基团为—OH、—COOH、—NH等.
To solve the problems of heavy metal pollution and agricultural wastes reclamation, spent substrate of pleurotus oyster was used as adsorbents to remove Cu2＋ from aqueous solution. The effects of pH value, adsorption time, temperature and initial Cu2＋ concentration on the adsorption behavior were determined by single factor experiments. The mechanisms were preliminarily investigated by SEM-EDX, FTIR and XRD analysis. The results of single factor experiments showed that the adsorption rate and capacity reached 74.46% and 0. 744 6 tug＇g-1 respectively at an adsorbent concentration of 10 g· L-1, a pH of 6, an adsorption time of 120 rain, an adsorption temperature of 30℃ and an initial Cu2＋ concentration of 8 mg. L-1. The experimental data fitted well with Langmuir isotherm models and R2 reached 0. 994 9, indicating the adsorption was a monolayer chemisorption. SEM-EDX, FTIR and XRD analysis indicated that the adsorption process mainly depended on the physical and chemical adsorption onto the substrate surface through electrostatic attraction, complexation and coordination reaction, The -OH, -COOH and -NH were the functioning groups for Cu2＋ adsorption.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2014年第2期669-677,共9页
Environmental Science
基金
环境保护公益性行业科研专项(2010467038)
关键词
生物吸附
平菇菌糠
CU2+
吸附等温模型
吸附机制
biosoroption
spent substrate of pleurotus oyster
copper ion
adsorption isotherm models
adsorption mechanism
