| .不同改良材料对铜的吸附-解吸特性研究[J].农业环境科学学报,2013,32(2):. |
| 不同改良材料对铜的吸附-解吸特性研究 |
| Adsorption-Desorption of Cu2+ by Several Amelioration Materials |
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| DOI：10.11654/jaes.2013.02.010 |
| 中文关键词: Ｃｕ２＋浓度 绿化植物 废弃物 草炭 腐植酸 灰潮土 吸附 解吸 |
| 英文关键词: Cu concentration greenery waste peat humic acids calcareous Chao Soil adsorption desorption |
| 基金项目: |
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| 摘要点击次数: 1918 |
| 全文下载次数: 1603 |
| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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. |
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