Department of Chemical Engineering, University of Malaya, Kuala Lumpur, Malaysia.
School of Environmental Engineering, Universiti Malaysia Perlis, Perlis, Malaysia.
J Environ Health Sci Eng. 2014 Mar 11;12(1):61. doi: 10.1186/2052-336X-12-61.
In this study the removal of Chromium (III) and Chromium (VI) ions are investigated via polymer enhanced ultrafiltration under important process parameters. This study proposes the use of unmodified starch as a novel polymer in the ultrafiltration process and its performance on the removal of chromium ions was compared with a commonly used polymer, polyethylene glycol.
The experiments were carried out at 1.5 bar and different pH values by using 10 kDa hollow fiber membrane operating in a cross-flow mode.
The best chromium ions removal obtained approached 99% for Chromium (III) ion by unmodified starch at alkaline pH region and at pH 7 for Chromium (VI) ions retention by polyethylene glycol. Permeate flux behavior are fluctuated for both chromium ions tested at high metal ion concentrations. Low concentration of unmodified starch is applied to reduce gelatinization behavior.
The findings suggest that binding of chromium ions by unmodified starch is related to granule structure which is probably a principal indicator of the non-ionic behavior of unmodified starch.
在这项研究中，通过聚合物增强超滤技术，在重要的工艺参数下研究了三价铬和六价铬离子的去除。本研究提出了在超滤过程中使用未改性淀粉作为一种新型聚合物，并将其对铬离子去除的性能与常用聚合物聚乙二醇进行了比较。
实验在 1.5 巴和不同 pH 值下进行，使用 10 kDa 中空纤维膜在错流模式下运行。
未改性淀粉在碱性 pH 条件下对三价铬离子的最佳去除率接近 99%，而聚乙二醇在 pH 7 时对六价铬离子的保留率最佳。在高金属离子浓度下，两种铬离子的透过通量行为都出现波动。低浓度的未改性淀粉可降低糊化行为。
研究结果表明，未改性淀粉对铬离子的结合与颗粒结构有关，这可能是未改性淀粉非离子行为的主要指标。
