无机盐对大孔树脂吸附苯甲醇的影响研究

Study on influence of salt on the adsorption of benzyl alcohol onto macropore resin

研究了水相中苯甲醇在大孔吸附树脂JX-101上的吸附行为及无机盐对吸附的影响。结果表明,JX-101树脂对苯甲醇具有良好的吸附性能,在研究的浓度范围内,吸附平衡符合Freundlich吸附等温式,NaCl存在时不影响吸附等温式的适用,且吸附量随NaCl含量的提高而增大。热力学研究表明,苯甲醇在JX-101上的吸附为焓推动、物理吸附为主的过程,NaCl的存在使得吸附过程的焓变和熵变均有所增大。Debye-McAulay盐效应理论能合理地解释NaCl的存在对树脂吸附苯甲醇的影响机理,通过盐效应方程结合Freundlich吸附等温式求得盐析系数ks为0.4257。

Adsorption behaviors of benzyl alcohol onto macropore resin JX-101 and influence of inorganic salt on the adsorption were detailedly studied. A batch sorption experiments showed that JX-101 had high sorption capacities for benzyl alcohol. While NaC1 existed in the solution, equilibrium adsorption data fitted Freundlich isotherms in the studied concentration range, as well as NaCl was inexistent. And the adsorption capacity increased when the content of NaCl rose. Thermodynamic results indicated that adsorption of benzyl alcohol onto JX-101 was an enthalpy-driving and physisorption process, and that the existence of NaCl caused more prominent AH and AS. Debye-McAulay salt-effect theory could primely explain the microcosmic mechanism of salt＇s influence on adsorption of benzyl alcohol onto JX-101. And the salt-out coefficient ks had been obtained through salt-effect equation combining Freundlich isotherm, which equaled 0. 4257.