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研究了201×7强碱性阴离子交换树脂吸附浓海水中溴的热力学行为,测定了不同温度下的吸附等温线,并计算出吸附过程的热力学参数ΔG、ΔH和ΔS。研究表明,该树脂对溴的吸附容量为2.489mg Br2/mL湿树脂,吸附率达到98%;吸附平衡数据符合Langmuir吸附等温方程;ΔG为负值,该吸附过程可自发进行;ΔH>0,且其绝对值小于40kJ/mol,表明该吸附过程吸热且属于物理吸附;ΔS>0,该吸附过程属于熵增过程。
The thermodynamic behavior of bromine adsorption in concentrated seawater by 201 × 7 strong basic anion exchange resin was studied. The adsorption isotherms at different temperatures were measured and the thermodynamic parameters ΔG, ΔH and ΔS were calculated. The results showed that the adsorption capacity of bromine for resin was 2.489mg Br2 / mL wet resin, and the adsorption rate reached 98%. The adsorption equilibrium data accorded with the Langmuir adsorption isotherm equation; ΔG was negative and the adsorption process could spontaneously proceed; ΔH> 0, And its absolute value is less than 40kJ / mol, indicating that the adsorption process is endothermic and belongs to physical adsorption; ΔS> 0, the adsorption process belongs to the entropy increase process.