辣木作为一种生物吸附剂去除铬的性能研究。

Performance of Moringa oliefera as a biosorbent for chromium removal.

机构信息

UNESCO-IHE Institute for Water Education, 2601 DA, Delft, The Netherlands.

出版信息

Water Sci Technol. 2010;62(5):1106-11. doi: 10.2166/wst.2010.413.

DOI:10.2166/wst.2010.413

PMID:20818052

Abstract

This study investigated adsorption of chromium on to a bio-adsorbent, Moringa oleifera seed. Different by-products of the seed processing were used as adsorbents. These include: the Whole Seed Powder (WSP), the Residue after Coagulant Extraction (RaCE) and an Activated Carbon (AC) prepared from the seed husk. Adsorption studies for the removal of Cr(III) and Cr(VI) were carried out in batch experiments and the effects of adsorbent dosage, contact time, pH and initial chromium concentration were analysed. Experimental results showed that maximum removal of Cr(III) and Cr(VI) was observed at pH 7 and pH 2, respectively. The percentage removals of Cr(III) by WSP, RaCE and AC were: 97, 94 and 99.9%, respectively. And the percentage removals of Cr(VI) by RaCE and AC were 47 and 83.2%, respectively. RaCE showed similar adsorption capacity to the WSP, which indicates that it is possible to extract a coagulant and use the waste product for adsorption. By using the RaCE, residual dissolved organic carbon in the treated water was significantly reduced compared to using the WSP. These results indicate that biomaterials can be considered as potential adsorbents for heavy metals removal from water or wastewater systems.

摘要

本研究探讨了铬在生物吸附剂辣木叶种子上的吸附。种子加工的不同副产物被用作吸附剂。这些包括：全籽粉（WSP）、凝固剂提取后的残渣（RaCE）和由种皮制备的活性炭（AC）。采用批量实验研究了去除 Cr(III)和 Cr(VI)的吸附，分析了吸附剂用量、接触时间、pH 值和初始铬浓度的影响。实验结果表明，Cr(III)和 Cr(VI)的最大去除率分别在 pH 7 和 pH 2 时观察到。WSP、RaCE 和 AC 对 Cr(III)的去除率分别为：97%、94%和 99.9%。RaCE 和 AC 对 Cr(VI)的去除率分别为 47%和 83.2%。RaCE 表现出与 WSP 相似的吸附能力，这表明可以提取一种凝固剂并将其副产物用于吸附。与使用 WSP 相比，RaCE 处理后的水中残留溶解有机碳明显减少。这些结果表明，生物材料可以被认为是从水或废水系统中去除重金属的潜在吸附剂。