海泡石对水相中抗坏血酸的吸附

以湖南湘潭海泡石为吸附剂,吸附废水中的低浓度抗坏血酸.在不同吸附条件下,进行了吸附规律试验研究及吸附材料性能检测.结果表明,在吸附时间为6.0 min,海泡石用量为15.0 g/L,pH=5.5时,对吸附初始质量浓度为150 mg/L的抗坏血酸,其吸附率能达到55%,对吸附初始质量浓度为70.0 mg/L的抗坏血酸,其吸附率能达到66.3%.海泡石对抗坏血酸的饱和吸附量为6.5 mg/g.添加少量的聚合氯化铝,吸附效率能大幅度提高,分析表明吸附效率的提高可能是吸附与絮凝协同作用的结果.经粒度测试显示,湖南湘潭海泡石粒度小、比表面积大,是一种无公害、天然的吸附材料,适于用作VC废水的深度处理.

Sepiolite Adsorption for Aqueous Ascorbic Acid

The sepiolite was taken from Xiangtan,Hunan Province as an adsorbent.The ascorbic acid was adsorbed by the sepiolite in wastewater and the process was investigated experimentally.The results indicated that after 6.0 min the sepiolite has an adsorption efficiency up to 55% if the dose is 15 g/L with a pH value 5.5 and the initial concentration of ascorbic acid is 150 mg/L,while the efficiency becomes 66.3% if the initial concentration of ascorbic acid is 70.0 mg/L. The saturated adsorption is 6.5 mg/g.Adding a bit of polymerized aluminum chloride into the wastewater can improve greatly the adsorption efficiency,which is possibly due to the synergistic reaction of adsorption with flocculation.According to the test results,the particle size of the sepiolite is fine with high specific surface area.So the sepiolite is naturally a harmless adsorbent available to be used for quite thorough wastewater.