| EFFECT OF pH ON THE ADSORPTION OF p-AMINOBENZOIC ACID ON POLYSTYRENE-BASED ADSORBENTS |
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| 作者姓名： | Hai-ling Wang Zheng-hao Fei Jin-long Chen Quan-xing Zhang |
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| 作者单位： | [1]Department of Environment Engineering, College of Urban Construction and Safety ＆ Environmental Engineering Nanjing University of Technology, Nanjing 210009, China [2]Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection, Yancheng 224002, China [3]State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, China |
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| 基金项目： | This work was supported by the 0pening Foundation of Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection of China （No. JLCBE05006）.ACKN0WLEDGMENTS We are grateful to the Analytical center at Jiangsu Petrochemical Institute for the measurements of surface area and pore structure and the State Key Laboratory Coordination Chemistry at Nanjing University for IR tests. |
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| 摘 要： | In the present study the adsorptive properties of p-aminobenzoic acid with hypercrosslinked and multi-functional polymeric adsorbents at different solution pHs were systematically investigated in accordance with the particular physicochemical characteristics of the aromatic amphoteric compound involving both Lewis acid and Lewis base functional groups. It was found that the equilibrium adsorption data of the three polymeric adsorbents fitted well in the Langmuir and Freundlich isotherm equations. Studies at various pH levels indicate that the capacity of the adsorbents for adsorption of the ionic forms of adsorbate is less than that for the corresponding neutral species. At pH 3.78, the adsorption capacities of the three adsorbents are the highest. Whereas the adsorption property of multi-functional polymeric adsorbent NJ-99 is the largest, which may be attributed to the strong hydrogen-bonding interaction between the amino groups on the resin and the carboxyl group of p-aminobenzoic acid. The trend of the adsorption capacities of the three adsorbents towards p-aminobenzoic acid with the solution pH is in accord with the dissociation curve of the neutral molecular p-aminobenzoic acid. The adsorption forces include π-π interaction, hydrogen-bonding interaction and electrostatic attraction or repulsion when there exist the molecular and ionic adsorbing species at different pHs in aqueous solution.
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| 关 键 词： | pH 对氨基苯甲酸 芳香族两性化合物 聚苯乙烯吸附剂 |
| 收稿时间： | 2006-03-27 |
| 修稿时间： | 2006-05-22 |
EFFECT OF pH ON THE ADSORPTION OF p-AMINOBENZOIC ACID ON POLYSTYRENE-BASED ADSORBENTS |
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| Hai-ling Wang Zheng-hao Fei Jin-long Chen Quan-xing Zhang.EFFECT OF pH ON THE ADSORPTION OF p-AMINOBENZOIC ACID ON POLYSTYRENE-BASED ADSORBENTS[J].Chinese Journal of Polymer Science,2007,0(3):235-244. |
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| Authors: | Hai-ling Wang Zheng-hao Fei Jin-long Chen Quan-xing Zhang |
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| Institution: | Department of Environment Engineering, College of Urban Construction and Safety &; Environmental Engineering, Nanjing University of Technology, Nanjing 210009, China Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection, Yancheng 224002, China State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, China |
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| Abstract: | In the present study the adsorptive properties of p-aminobenzoic acid with hypercrosslinked and multi-functional polymeric adsorbents at different solution pHs were systematically investigated in accordance with the particular physicochemical characteristics of the aromatic amphoteric compound involving both Lewis acid and Lewis base functional groups. It was found that the equilibrium adsorption data of the three polymeric adsorbents fitted well in the Langmuir and Freundlich isotherm equations. Studies at various pH levels indicate that the capacity of the adsorbents for adsorption of the ionic forms of adsorbate is less than that for the corresponding neutral species. At pH 3.78, the adsorption capacities of the three adsorbents are the highest. Whereas the adsorption property of multi-functional polymeric adsorbent NJ-99 is the largest, which may be attributed to the strong hydrogen-bonding interaction between the amino groups on the resin and the carboxyl group of p-aminobenzoic acid. The trend of the adsorption capacities of the three adsorbents towards p-aminobenzoic acid with the solution pH is in accord with the dissociation curve of the neutral molecular p-aminobenzoic acid. The adsorption forces include π-π interaction, hydrogen-bonding interaction and electrostatic attraction or repulsion when there exist the molecular and ionic adsorbing species at different pHs in aqueous solution. |
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| Keywords: | Aromatic amphoteric compound p-Aminobenzoic acid Polymeric adsorbents Adsorption Isotherms Effect of pH ADSORBENTS ACID ADSORPTION electrostatic attraction exist aqueous solution forces trend solution pH dissociation curve molecular strong interaction amino groups resin carboxyl group adsorption property |
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