Mizera J, Mizerová G, Machovic V, Borecká L
Nuclear Physics Institute, Academy of Sciences of the Czech Republic, 250 68 Rez u Prahy, Czech Republic.
Water Res. 2007 Feb;41(3):620-6. doi: 10.1016/j.watres.2006.11.008. Epub 2006 Dec 22.
Potential low-cost sorbents of metals based on combined action of coal and chitosan have been investigated. Sorption of Cs, Co and Eu on oxidized coals in mixture with chitosan was studied as function of pH ( approximately 3-6) in batch experiments using radiotracer method. An improved sorption efficiency of the coal sorbents at neutral pH was obtained in mixture with chitosan, namely for oxihumolite at sorption of Eu and Co. Chitosan prevented deterioration of the sorption ability of coal with pH increase probably via retaining the soluble complexes with humic substances leached from coal by formation of an insoluble complex. The effect of chitosan addition was negligible or reverse in case of lignite upon acidification, where the interaction takes place preferentially on the coal surface and may restrict availability of the binding sites for metal ions.
基于煤和壳聚糖联合作用的潜在低成本金属吸附剂已被研究。采用放射性示踪法，在分批实验中研究了铯、钴和铕在氧化煤与壳聚糖混合物上的吸附情况，该吸附情况是pH值（约3 - 6）的函数。在与壳聚糖混合时，煤吸附剂在中性pH值下的吸附效率得到提高，即在吸附铕和钴时对氧化腐殖煤而言。壳聚糖可能通过形成不溶性络合物保留从煤中浸出的腐殖质的可溶性络合物，从而防止随着pH值升高煤的吸附能力下降。在褐煤酸化的情况下，壳聚糖添加的影响可忽略不计或呈相反作用，在褐煤酸化时，相互作用优先发生在煤表面，这可能会限制金属离子结合位点的可用性。
