工农业的快速发展导致水体中砷污染成为棘手的环境问题之一.基于生物吸附法快速、经济、可逆、环境友好等性质以及废麦糟量大、易得的特点,同时为了顺应我国《生活饮用水卫生标准》(GB 5749-2006),以低浓度含As(Ⅲ)水为处理对象,啤酒麦糟(SG)为原料,基于密度泛函理论和前线轨道理论,经巯基乙酸、乙酸改性制备巯基乙酸改性麦糟(TSG)和乙酸改性麦糟(ASG)两种吸附剂,并对其结构进行表征.考察了溶液pH值、吸附时间及As(Ⅲ)初始浓度对TSG和ASG吸附As(Ⅲ)性能的影响.结果表明,吸附过程符合准二级动力学方程,吸附过程为化学吸附;TSG和ASG对As(Ⅲ)的吸附行为可用Langmuir模型描述.研究结果可为含砷地下水的深度净化提供理论依据和技术参考.%With the rapid development of industry and agriculture,arsenic pollution in water has become one of the most serious environmental problems.Based on the characteristics of biosorption being a rapid,reversible,economical and eco-friendly technology and that of large quantity and easy gained of spent grain (SG),deeply purified water containing arsenic using spent grains as biosorbent technique has been put forward.Also the technique is to conform the new ＜ Standards for Drinking Water Quality ＞(GB5749-2006).Low concentration of As(Ⅲ) was chosen as the treating object,brewer's spent grain as raw materials for adsorbent,based on the density functional theory and frontier orbital theory,two biosorbents were prepared by thiol/carboxyl modified SG,which named TSG and ASG,whose structure can be characterized by SEM and FTIR.The effect of solution pH,adsorption time and initial As(liD concentration on adsorption behavior were studied.It was found that the adsorption processes followed a pseudo-second-order equation.Both of the adsorptions were chemical process and the equilibrium isotherms were described by Langmuir model.It provides theoretical basis and technical reference for depth purifying the ground water containing arsenic.
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