摘要
由大孔交联氯甲基化聚苯乙烯进行甲胺化和乙酰化反应,合成了聚(N-甲基-N-对乙烯基苄基乙酰胺)树脂,树脂的氯含量由原来的3.95mmol/g降至0.63mmol/g。测定了树脂对水中苯酚的吸附等温线,结果表明,吸附平衡数据符合Freundlich等温方程。利用热力学函数关系计算了吸附焓、吸附自由能和吸附熵,结果表明,吸附量在10~40mg/g时,吸附焓为-71.20^-24.65kJ/mol,吸附自由能为-4.64^-6.07kJ/mol,吸附熵为-62.35^-218.56J/(mol·K)。讨论了吸附过程中树脂对水中苯酚吸附的氢键与疏水作用的吸附机理。关键词吸附树脂,苯酚。
Poly （N-methyl-N-p-vinylbenzylacetamide） resin was prepared from macroporous crosslinked chloro-methylated polystyrene by methylamination and acetylation, and in the process the chlorine content of the resin decreased from 3.95 mmol/g to 0. 63 mmol/g. Adsorption isotherm of phenol onto the resin from aqua was measured, and the equilibrium data can be characterized by Freundlich isotherms. The enthalpy, free energy, and entropy for the adsorption were calculated according to thermodynamic function relationships. The adsorption enthalpy was - 24. 65 ～ - 71.20 kJ/mol, the adsorption free energy - 4.64 ～ - 6.07 kJ/mol, and the adsorption entropy -62. 35 ～-218.56 J/（ mol · K）, when the adsorption capacity was in the range of 10 -40 mg/g. In addition, the adsorption mechamsm ot nyctrogen bonding and hydrophobic interation was discussed. This functionalized resin may be applied in the removal of phenol in the wastewater with phenolic compounds and the extraction of active components with hydrogen bonding donator of Chinese traditional and herbal drugs.
出处
《应用化学》
CAS
CSCD
北大核心
2008年第6期714-717,共4页
Chinese Journal of Applied Chemistry
基金
长沙学院资助项目(91332)
关键词
吸附树脂
苯酚
吸附热力学
polymeric adsorbent, phenol, adsorption thermodynamics
