文冠果种皮对水中Hg(Ⅱ)的生物吸附研究  

Hg(Ⅱ) Biosorption on Xanthoceras sorbifolia Testae

作　　者：姚增玉[1] 危冲 戚建华[1] 

机构地区：[1]西南林业大学西南山地森林资源保育与利用省部共建教育部重点试验室,云南昆明650224 [2]陕西省汉中市公安局,陕西汉中723000

出　　处：《西南林业大学学报（自然科学）》2016年第5期169-174,共6页Journal of Southwest Forestry University：Natural Sciences

基　　金：国家自然科学基金项目(21167016;51268052)资助

摘　　要：通过对生物质能源生产废弃物文冠果种皮作为新型生物吸附剂去除水中Hg（Ⅱ）的性能进行探讨,应用振荡平衡批处理法研究了起始p H和吸附剂用量对吸附性能的影响,采用准一级动力学模型、准二级动力学模型和粒内扩散模型对吸附动力学数据进行分析,并用Langmuir和Freundlich等温线对吸附平衡数据进行拟合。结果表明：文冠果种皮吸附水中Hg（Ⅱ）的适宜p H值为4~6,达到吸附平衡所需时间随着Hg（Ⅱ）初始浓度的增加而延长;吸附过程符合准二级吸附动力学模型,颗粒内扩散不是控制吸附速率的唯一因素;吸附平衡符合Langmuir模型,饱和吸附量为0.305 1 mmol/g。利用文冠果种皮吸附水中Hg（Ⅱ）,以废治污,具有一定的利用前景。Xanthoceras sorbifolia testae, an residue of bioenergy production, were investigated as a novel bio- sorbent for the Hg （Ⅱ） removal from aqueous solution. A series of experiments were conducted in a batch system to assess the effect of initial pH and biosorbent dose on the biosorption performance. The suitability of the pseudo-first- order, the pseudo-second-order and the intra-particle diffusion models to the kinetic data were investigated, and the equilibrium data were fitted with the Langmuir and the Freundlieh isotherms. The results showed that optimal pH values for the biosorption ranged from 4 to 6. It took a longer time to get sorptive equilibrium at a higher initial Hg （Ⅱ） concentration. The kinetic data followed the pseudo-second-order kinetic equation. Intra-particle diffusion is not the sole rate-controlling factor. The equilibrium data conformed the Langmuir isotherm, and the sorption capacity was 0. 305 1 mmol/g. Using Xanthoceras sorbifolia testae to sorb Hg （Ⅱ） from the wastewater is a means of controlling the waste with the residue, which have some prospects in practice.

关 键 词：Hg(Ⅱ) 污染 文冠果 种皮 生物吸附剂 生物质能源 

分 类 号：S786[农业科学—林学]