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| 生态提取液改性土壤对Cd2+和Pb2+的吸附性能分析 |
| Adsorption Performance of Ecological Extract Modified Soil for Cd2+ and Pb2+ |
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| DOI： |
| 中文关键词: undefined |
| 英文关键词: undefined |
| 基金项目:国家自然科学基金资助项目（42507308）；四川省科技厅基金资助项目（18ZB0576） |
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| 中文摘要: |
| 用紫茎泽兰和藓类泥炭的生态提取液对紫色土、黄棕壤、盐碱土进行单一和复合改性，得到改性土样，采用批处理法研究Cd2+、Pb2+在改性土样中的吸附热力学和动力学特征，考察改性土壤吸附Cd2+和Pb2+的效果，并分析pH值、离子强度和温度对吸附效果的影响。实验表明：改性土样吸附Cd2+和Pb2+的最大吸附量分别为8344 mmol/kg～10781 mmol/kg和15849 mmol/kg～20846 mmol/kg；在pH值为6、温度为35 ℃和离子强度为01 mol/L条件下，Cd2+和Pb2+吸附量达到峰值；Langmuir模型较Freundlich模型更适用于描述改性土样吸附Cd2+和Pb2+的过程，该吸附过程为自发、吸热和熵增的反应，且吸附受化学反应驱动。 |
| 英文摘要: |
| Extracts from Ageratina adenophora and peat moss were used to modify purple soil， yellowbrown soil， and salinealkali soil individually and in combination.The batch treatment method was employed to study the thermodynamic and kinetic characteristics of Cd2+ and Pb2+ adsorption on the modified soils， along with an analysis of the effects of pH， ionic strength， and temperature. Results showed that the maximum adsorption capacities for Cd2+ and Pb2+ in the modified soil samples were 8344 mmol/kg~10781 mmol/kg and 15849 mmol/kg~20846 mmol/kg， respectively. Under conditions of pH 6， 35 ℃， and an ionic strength of 01 mol/L， the adsorption capacities for Cd2+ and Pb2+ reached their maximum values. The Langmuir model demonstrated better applicability than the Freundlich model for fitting the adsorption process. The adsorption of Cd2+ and Pb2+ was spontaneous， endothermic， and entropyincreasing， and was driven by chemical reactions. |
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