School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200072, PR China.
J Hazard Mater. 2010 Apr 15;176(1-3):193-8. doi: 10.1016/j.jhazmat.2009.11.012. Epub 2009 Nov 10.
This research has demonstrated that the Friedel phase, e.g. a chloride-containing hydrocalumite (Ca(2)Al(OH)(6)Cl(H(2)O)(2) x mH(2)O), can rapidly adsorb large amounts of SeO(4)(2-) (up to 1.37 mmol/g). SeO(4)(2-) is removed via anionic exchange, as evidenced by the expansion of the d-spacing from 0.78 nm of Cl-hydrocalumite to 0.97-0.98 nm of SeO(4)-hydrocalumite. The newly formed SeO(4)-adsorbed hydrocalumite is stable in water at pH 4-13, indicating the strong fixation of selenate within the phase. In contrast, intercalated selenate in the Freidel phase can be recovered by desorbing in the NaCl solution, which can also regenerate and recycle the used adsorbent. The findings in this research strongly suggest that the Friedel phase is a new, environmentally friendly and cost-effective adsorbent to adsorb selenate from wastewater streams and dilute solutions.
本研究表明，Friedel 相（例如含氯水合钙矾石（Ca(2)Al(OH)(6)Cl(H(2)O)(2) x mH(2)O））可以快速吸附大量的 SeO(4)(2-)（高达 1.37 mmol/g）。SeO(4)(2-)通过阴离子交换被去除，这一点可以通过层间距从 Cl-水合钙矾石的 0.78nm 扩展到 SeO(4)-水合钙矾石的 0.97-0.98nm 得到证明。新形成的 SeO(4)-吸附水合钙矾石在 pH 4-13 的水中稳定，表明硒酸盐在该相中被强烈固定。相比之下，Friedel 相中插层的硒酸盐可以通过在 NaCl 溶液中解吸来回收，这也可以使用过的吸附剂再生和循环使用。本研究的结果强烈表明，Friedel 相是一种新型的、环保且经济高效的吸附剂，可以从废水中和稀溶液中吸附硒酸盐。
