摘要
在实验室条件下,以静态、序批的方法研究了厌氧颗粒污泥对废水中Hg2+的吸附特性及环境条件对其吸附能力的影响,并通过红外光谱和能谱对比手段,初步探讨了厌氧颗粒污泥吸附Hg2+的机理。结果表明,厌氧颗粒污泥对Hg2+的吸附过程符合准二级吸附动力学模型,其吸附等温线与Freundlich型拟合得较好(R2=0.9933);pH是影响吸附的重要因素,在pH值为3~8的范围内,吸附量较大,最大为64.64 mg/g,当pH值大于8或小于3时,吸附量逐渐下降;温度对吸附也有一定的影响,但影响程度不明显。红外光谱和能谱分析表明,厌氧颗粒污泥表面功能基团对Hg2+的络合作用是吸附的主要机理,这些基团包括—CH、—CH2、—CH3、P—H、CO、C—N、PO、SO及C—H,同时在吸附过程中还存在一定的离子交换吸附。
Under laboratory conditions,adsorption characteristics of the anaerobic granulate sludge on Hg^2＋ in wastewater and environmental effects on adsorptive capacity were studied by a method of static state and sequential batch; and the adsorption mechanism of theanaerobic granulate sludge onto Hg^2＋ was preliminarily explored through comparison means ofinfrared spectrum and energy spectrum analysis. The results showed that adsorption process of the anaerobic granulate sludge onto Hg^2＋ accords with Pseudo-second Order model, and adsorption isotherm fit Freundlich model well （R^2 = 0. 9933）. pH is an important factor affecting adsorption, greater absorption quantity can be achieved when the pH value is from 3 to 8, the greatest absorption quantity is 64.64 mg/g, the adsorption quantity gradually decreases when the value of pH is more than 8 and less than 3. The temperature also affects the adsorption of the anaerobic granular sludge, but the effect is not obvious. The analysis of infrared spectrum and energy spectrum shows that adsorptive main mechanism is the complexation of surface functional group of the anaerobic granulate sludge to Hg^2＋ ; these surface functional group are -CH,-CH2 ,-CH3 , P-H, C = O, C-N, P=O,S=O,= C-H. Meanwhile, there are certain proportion ions exchange adsorptions in the whole adsorption process.
出处
《环境工程学报》
CAS
CSCD
北大核心
2009年第4期601-606,共6页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(50578102)
山西省科技厅工业处攻关项目(2007031177)
关键词
厌氧颗粒污泥
吸附动力学
吸附等温线
吸附机理
汞离子
anaerobic granular sludge
adsorption kinetics
adsorption isotherm
adsorption mechanism
mercury ions
