氯化锌法改性小麦秸秆制备生物碳质吸附剂及其对磷酸根的吸附效果

Biomass adsorbents prepared from wheat straw by chemical modification with zinc chloride and its adsorption of phosphate

为实现农作物秸秆资源化,解决水体富营养化问题,将小麦秸秆化学改性成一种可以有效吸附水体中磷酸根的生物碳质吸附剂,重点考察了氯化锌法改性小麦秸秆制备生物碳质吸附剂的最佳工艺条件以及产品对水体中磷酸根的去除效果。结果表明,当氯化锌溶液质量浓度为250 g/L、浸渍比为2.2∶1、活化温度为600℃、活化时间为45 min时,所得的小麦秸秆生物碳质吸附剂的得率为37.85%,对磷酸根的去除率为99.33%。

To make wheat straw recyclable and solve the eutrophication of water, wheat straw was modified into an biomass adsorbent. The best modified conditions by zinc and the effect of phosphate adsorbed onto modified wheat straw were systematically examined through batch experiments. The results indicate that the optimal modified conditions are as follows： zinc chloride mass concentration of 250 g/L, impregnation ratio of 2.2： 1, activation temperature of600℃ , and activation time of 45 min, under these conditions, the yield of the hiomass adsorbents is 37.85%, the modified wheat straw adsorbs phosphate most effectively, and the removal rate of phosphate can reach to 99.33%.