大孔树脂对增甘膦盐溶液Ca^(2+)去除性能研究

Removal of Ca^(2+)from Glyphosine Salt Solution by Macroporous Resin

采用大孔阳离子交换树脂对增甘膦钙溶液进行脱钙处理,重点探讨了该树脂对Ca^(2+)的等温和动力学吸附行为,研究了pH对其吸附性能的影响及树脂的重复使用性,并对钙离子脱除机理进行了研究。结果表明:该树脂对Ca^(2+)的吸附不受溶液初始pH影响,在20 min内即可达到平衡,最大吸附量为52.87 mg/g,且经5次重复利用后,对Ca^(2+)的回收率仍可维持在98.2%以上;该过程符合Langmuir等温吸附模型、准二级动力学模型,另外,该树脂在处理实际增甘膦溶液时可实现钙离子的高效脱除;机理分析表明该树脂对Ca^(2+)吸附以离子交换反应为主。这为复杂有机废液中钙的分离脱除提供了有益的理论参考。

In this work,macroporous cation exchange resin was used for the selective removal of Ca^(2+)ions from glyphosine calcium solution.The adsorption isotherm,kinetic,pH effect,and the reusability of macroporous resin were studied.Further,the adsorption mechanism was explored based on the Fourier infrared spectroscopy.The results showed that the adsorption of Ca^(2+)is barely affected by the initial solution pH,and it reaches the equilibrium within 20 min,with a maximum adsorption capacity of 52.87 mg/g.The adsorption process is in accordance with the Langmuir isothermal adsorption model,the pseudo-first-order and pseudo-second-order kinetic models,respectively.After reusing the resin five times,the recovery efficiency of Ca^(2+)still remains above 98.2%.Moreover,in practical glyphosine calcium solution,the Ca^(2+)ions can also be removed efficiently by using the resin as an adsorbent.The mechanism analysis showed that Ca^(2+)is adsorbed onto the resin mainly through ion exchange.Overall,this study provides a theoretical reference for the separation and removal of calcium ions from the complex organic wastewater.