摘要
农林废弃物是农业和林业生产与加工过程中产生的副产品，不仅具有数量巨大、可再生和再生周期短等特点，而且易交联产生活性基团，能高效、快速地去除水中的重金属离子。利用农林废弃物制备生物吸附剂处理重金属废水日益受到重视。许多农林废弃物（木屑、花生壳、稻壳、秸秆、树皮、甘蔗渣等）对水中重金属离子（Pb、Cr、Cd、Cu等）具有良好的去除效果，去除率在50％-100％之间，经改性处理的农林废弃物去除效果更好。目前关于农林废弃物吸附重金属离子的确切机制还不十分清楚，但一般认为与物理吸附、化学吸附、表面吸附、络合、离子交换以及扩散等过程有关。利用农林废弃物制备廉价、高效的吸附剂处理重金属废水，既实现了资源的综合利用，又达到以废治废的目的，具有广阔的应用前景。
Agricultural and forestry wastes as bioadsorbents have been aroused great attentions due to its advantages such as low cost, easy to cross-linking reactive adsorption groups and it can be efficiently and quickly remove heavy metal ions in wastewater. Some of the treated adsorbents including sawdust, rice husks, peanut shell, straw, bark and bagasse show good adsorption capacities for Pb, Cr, Cd and Cu, with biosorption capacity from 50% to 100%. Chemically modified agricultural and forestry wastes exhibit higher adsorption capacities than unmodified forms. The mechanisms of biosorption process are not well understood, but it may be related to the process of physisorpion, chemisorption, surface adsorption, complexation, ion exchange and diffusion. Agricultural waste material being highly efficient, low cost and renewable source of biomass can be exploited for heavy metal remediation to enhance their applicability at industrial scale.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2014年第1期94-98,共5页
Environmental Science & Technology
基金
西南民族大学中央高校青年教师基金项目(11NZYQN20)
关键词
农林废弃物
生物吸附
重金属
化学改性
agricultural and forestry wastes
biosorption
heavy metal
chemical modification
