硝基苯在渭河沉积物中双模式吸附阻滞因子  

Retardation factor of nitrobenzene dual-mode adsorption in Weihe River sediment

作　　者：邱立萍[1] 王虎[2] 

机构地区：[1]长安大学环境科学与工程学院,西安710054 [2]长安大学理学院,西安710064

出　　处：《环境工程学报》2016年第2期761-767,共7页Chinese Journal of Environmental Engineering

基　　金：陕西省自然科学基金资助项目(2013JM5013)

摘　　要：采用批量平衡法对硝基苯在渭河沉积物中的吸附特性进行了研究,结果表明,沉积物的有机质含量和性状对硝基苯的吸附过程具有较大的影响,有机质含量和孔隙力场对硝基苯会发生竞争吸附,以Linear和Langmuir等温吸附式耦合的双模式吸附模型可以较好地描述硝基苯在河流沉积物中的吸附特性,以此获得表征其在沉积物中吸附的特性参数,通过求解对流-弥散方程的反问题,获得了双模式吸附阻滞因子数学表达式,计算出硝基苯在该沉积物中吸附的阻滞因子,并得出阻滞因子越小,硝基苯污染的环境风险越大,不仅为硝基苯在河流-地下水系统中的迁移转化规律提供了可靠参数,而且可有效预警硝基苯污染的风险程度,为管理部门提供污染防治的决策依据。The adsorption properties of nitrobenzene were studied using a batch equilibrium method with Weihe River sediment. The results showed that the organic matter content and characteristics of the sediments have great influence on the nitrobenzene adsorption process. The organic matter content and pore force-field in the sediment result in competitive adsorption of nitrobenzene. A dual-mode,coupled by Linear and Langmuir isotherm adsorption models,could better describe the adsorption properties of nitrobenzene in the sediments,from which nitrobenzene adsorption characteristic parameters in the sediment were obtained. A mathematical expression of dual-mode adsorption-retardation factor was obtained by solving the inverse problem of convection-diffusion equation. The retardation factor of nitrobenzene adsorption was calculated for the sediments. When the retardation factor was smaller,the risk of nitrobenzene contaminated environment was greater. This provides reliable parameters for the migration and transformation rules of nitrobenzene in river-groundwater systems and warns effectively about the degree of risk of nitrobenzene pollution. This also provides a basis for decisions to control and prevent pollution.

关 键 词：硝基苯 河流沉积物 等温吸附 双模式模型 阻滞因子 

分 类 号：X522[环境科学与工程—环境工程]