树脂吸附法去除地黄水煎液中重金属砷

Removal of Arsenic from Aqueous Extract of Rehmannia Radix Using Resins

目的采用树脂吸附法去除中药提取液中的重金属砷。方法在大孔吸附树脂和阴离子交换树脂对砷盐溶液的静态吸附实验基础上,选取D273、D293、D201、D201×7 4种阴离子交换树脂,以砷去除率、固形物量损失率和砷去除率/固形物量损失率3个参数为评价指标,考察了其对地黄水煎液中砷的去除作用,进而研究了D293树脂吸附过程中的各因素(流速、高径比、温度、药液浓度等)及其交互项对树脂吸附去除砷的影响,最后对D293树脂的重复使用性能进行了评价。结果 D293树脂对地黄水煎液中的砷的脱除效果最好,最大的砷去除率接近100%,动态吸附实验表明影响D293树脂吸附去除砷的主要因素是药液浓度、温度、流速。D293树脂重复使用了5次,砷去除率没有明显下降。结论阴离子交换树脂可以用于去除中药提取液中的重金属砷。

OBJECTIVE To removal arsenic from Chinese herb extract using resins. METHODS On the basis of static adsorption experiments on the absorption of arsenate by macroporous adsorption resins and anion exchange resins, four kinds of anion exchange resins（D273, D293, D201, D201×7） were selected, and removal rate of arsenic, loss rate of dry ointment yield and removal rate of arsenic/loss rate of dry ointment yield were employed to investigate the removal of arsenic from aqueous extract of Rehmannia Radix. The effect of operating parameters such as flow rate, height to diameter ratio, temperature and concentration of extract on arsenic removal with D293 resin was investigated in multi-factor experiments. Finally, the reusability of D293 resin was evaluated. RESULTS D293 resin had the best arsenic removal ability with about 100% removal rate of arsenic, and the concentration of extract, temperature and flow rate were the main factors that influenced the removal rate of arsenic using D293 in dynamic absorption experiments. D293 resin could be used for 5 times without significant decrease of arsenic removal rate. CONCLUSION Anion exchange resin can be used to remove arsenic from Chinese herb extract.