Adsorption selectivity of salicylic acid and 5-sulfosalicylic acid onto hypercrosslinked polymeric adsorbents |
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Authors: | Liu Fuqiang Xia Mingfang Fei Zhenghao Chen Jinlong and Li Aimin |
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Institution: | (1) State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210093, China;(2) Research Institute of Environmental Sciences of Jiangsu Province, Nanjing, 210036, China;(3) Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection, Department of Chemistry of Yancheng Teachers College, Yancheng, 224002, China |
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Abstract: | Both bottle-point and column-feeding experiments involving different solutes and sorbents were carried out to investigate
the adsorption selectivity and separation performance of salicylic acid and 5-sulfosalicylic acid. Their adsorption isotherms
onto such hypercrosslinked polymeric adsorbents as NDA-100 and NDA-99 could be well described by the Freundlich equations
whose characteristics describe extrathermic and favorable adsorption processes. The adsorption towards NDA-100 mainly depended
on the π-π interaction, while that towards NDA-99 was extremely influenced by the static-electric interaction. Additionally,
the adsorptive capacity of salicylic acid on NDA-99 decreased while it increased on NDA-100 with the presence of 5-sulfosalicylic
acid in the adsorptive environment as the competitive component. Comparatively, the adsorption capacity of 5-sulfosalicylic
acid decreased on both resins with salicylic acid as the competitive component. In fact, the difference in the interaction
between adsorbent and adsorbate resulted in the straight antagonism on the effective adsorption sites on the adsorbent. In
conclusion, the adsorption selectivity of salicylic acid onto NDA-100 was obviously larger than that onto NDA-99 with the
existence of 5-sulfosalicylic acid in the adsorptive environment. A satisfactory separation and recovery of tested solutes
in aqueous phase could be foreseeably achieved by the sequencing adsorption technique involving NDA-100 as well as NDA-99.
Translated from Environmental Pollution & Control, 2005, 27(8): 570–574 译自: 环境污染与防治] |
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Keywords: | salicylic acid 5-sulfosalicylic acid hyper-crosslinked polymeric adsorbent adsorption selectivity sequencing adsorption technique |
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