不同改良材料对铜的吸附-解吸特性研究  

Adsorption-Desorption of Cu^(2+) by Several Amelioration Materials

作　　者：章菁熠[1,2] 梁晶[2] 方海兰[2] 郝冠军[2] 吕子文[2] 柏营 

机构地区：[1]南京农业大学资源与环境科学学院,南京210095 [2]上海市园林科学研究所,上海200232 [3]上海申迪园林投资建设有限公司.上海201205

出　　处：《农业环境科学学报》2013年第2期274-281,共8页Journal of Agro-Environment Science

基　　金：上海辰山植物园专项(G102402);上海市人才发展基金(2009044);上海市科委项目(11dz1201704)

摘　　要：用一次平衡实验法进行腐植酸、草炭、绿化植物废弃物、活化绿化植物废弃物和上海灰潮土对Cu2+吸附解吸特性的研究。结果表明:在相同pH条件下,所有材料对Cu2+的吸附量随平衡液中Cu2+浓度的增加而增大,其等温吸附曲线均能较好地用Langmuir方程和Freundlich方程进行拟合。Cu2+初始浓度较小时,绿化植物废弃物、活化绿化植物废弃物和草炭对Cu2+的吸附量不受pH的影响;Cu2+初始浓度较大时,供试材料对Cu2+吸附量具有随pH值增加而增加的趋势,但随着pH的增加,供试材料对Cu2+的解吸率呈逐渐降低的趋势。腐植酸和灰潮土对Cu2+的吸附量随pH的增加有逐渐增大的现象,其解吸率则随pH增加先增大后减小。各供试材料中,绿化植物废弃物、活化绿化植物废弃物和草炭对重金属铜的吸持固定能力最强,环境调节控制能力最佳,对Cu2+的吸附容量大小顺序为绿化植物废弃物>活化绿化植物废弃物>草炭>腐植酸>灰潮土。绿化植物废弃物可以替代草炭用于城市土壤铜污染修复。Adsorption and desorption of Cu2+ by humic acids, peat, greenery waste, activated greenery waste and a calcareous Chao Soil were investigated with the batch method. The results showed that adsorptions of Cu2+ by these materials increased with the increase of Cu2+ concentration in the equilibrium solution at the same pH. Both Langmuir and Freundlich equations fitted the adsorption data well. When initial concentration of Cu2+ was relatively low, the adsorption capacity of Cu2+ by greenery waste, activated greenery waste and peat was not affected by the change of medium pH. However, when initial concentration of Cu2+ was relatively high, the adsorption was increased with the increasing pH value, but the desorption rate of pre-adsorbed Cu2+ changed with pH oppositely. The adsorption capacity of Cu2+ by humic acids and the calcareous Chao Soil increased with rising pH, while the desorption rate of pre-adsorbed Cu2+ increased with the increase in pH firstly and then decreased with the further increase in pH. The adsorption capacity of Cu2+ by these materials followed the order:greenery waste>activated greenery waste >peat >humic acids >calcareous Chao Soil, which suggested that greenery waste, activated greenery waste, and peat had strongest ability to fix Cu2+ among four organic materials and a soil. Greenery waste is a wonderful alternative of peat to remedy Cu contaminated urban soils.

关 键 词：Cu2+浓度 绿化植物 废弃物 草炭 腐植酸 灰潮土 吸附 解吸 

分 类 号：X131.3[环境科学与工程—环境科学]