The Preparation and Application of Al-pillared Vermiculite in Phosphate Adsorption

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The Preparation and Application of Al-pillared Vermiculite in Phosphate Adsorption

更新时间：2023-11-28

- The Preparation and Application of Al-pillared Vermiculite in Phosphate Adsorption
- Advanced Engineering Sciences Vol. 40, Issue 4, Pages: 77-82(2008)
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- Published：2008，
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刘勇,李晖,张永丽.羟基铝柱撑蛭石的制备及其吸附磷酸根性能研究[J].工程科学与技术,2008,40(4):77-82.

The Preparation and Application of Al-pillared Vermiculite in Phosphate Adsorption. [J]. Advanced Engineering Sciences 40(4):77-82(2008)
刘勇,李晖,张永丽.羟基铝柱撑蛭石的制备及其吸附磷酸根性能研究[J].工程科学与技术,2008,40(4):77-82. DOI：

The Preparation and Application of Al-pillared Vermiculite in Phosphate Adsorption. [J]. Advanced Engineering Sciences 40(4):77-82(2008) DOI：

摘要

中文摘要: 采用新疆尉犁蛭石矿，依次经过HNO3酸化，600 ℃灼烧，草酸酸化，NaCl交换，再用Keggin离子插层，得到了羟基铝柱撑蛭石。进而将此改性蛭石用于吸附磷酸根，讨论了溶液pH值、吸附剂用量、吸附时间、磷酸根浓度、温度对吸附平衡的影响，考察了吸附机理。结果表明，pH3条件下，改性后的蛭石对磷酸根的去除效果较原蛭石好，0.2 g柱撑蛭石对25 ml浓度为0.5 mmol·L-1磷酸根的去除率为98.0%，达到了废水排放的标准。羟基铝柱撑蛭石对磷酸根的吸附动力学可用拟二级速率方程来描述，计算值与实测值吻合甚好

Abstract

Abstract:The natural vermiculite supplied from Weili miner of Xinjiang was submitted to an nitric acid treatment followed by calcinations

oxalic acid treatment

and sodium form by ion exchange

which results in the increase of the framework Si/Al ratio

the reduction of the layer charge density

and the conversion of the vermiculite into a form of sodium vermiculite. Then the Al pillared vermiculite was obtained by contact with the aluminum pillaring solution. Furthermore

phosphate sorption experiments were carried out for Al-pillared vermiculite under different conditions to investigate its sorption behaviors and mechanisms. The phosphate sorption maxima for the Al-pillared vermiculite are 98.0 % at pH3. Pseudo second order model can best describe the reaction rate

and the adsorption capacity calculated by the model is consistent with that actual measurement for Al-pillared vermiculite

which the correlation coefficient（R2）is 0.9961. The experimental data with phosphate concentrations from 0.5 to 5.0 mmol·L-1 follow Langmiur isotherm model for Al-pillared vermiculite. The increase of temperature from 10 ℃ to 60 ℃ increased the sorption of Pb(II)

which indicates that the adsorption process is endothermic. The adsorption enthalpy is 5.583 kJ·mol-1

the entropy is 52.59 J·mol-1·K-1

and the free energy is –9.290 (10 ℃)

-10.40 (30 ℃)

-11.06 (45 ℃)

-11.96 (60 ℃) kJ·mol-1 respectively.

关键词

羟基铝柱撑蛭石X射线衍射磷酸根吸附

Keywords

Al-pillared vermiculiteX-ray diffractionphosphatesadsorption

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四川大学建筑与环境学院四川

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Sichuan Juhao Jinyue Agriculture and Forestry Technol. Co., Ltd.

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