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Chemistry of the M (M=Fe, Ca, Ba)-Se-H2O Systems at 25 °C
Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 1,1 Katahira, 2-chome, Aobaku, Sendai 980-8577, Japan
Graduate School of Student, Tohoku University, Currently Ebra Co. Ltd., Tokyo, Japan
New Industry Creation Hatchery Center Tohoku University, Aoba, Aramaki, Aobaku, Sendai 980-8579, Japan
* Author to whom correspondence should be addressed.
Received: 28 July 2009; in revised form: 18 August 2009 / Accepted: 11 September 2009 / Published: 14 September 2009
Abstract: The chemistry of the M (M=Fe, Ca, Ba)-Se-H2O systems at 25 °C is reviewed based on our previous papers. In this paper, the phase equilibria in the Fe(III)-Se(IV)-H2O, Ca-Se(IV,VI)-H2O and Ba-Se(IV,VI)-H2O systems at 25 °C are discussed. Then, the three-stage process for removal of selenium from industrial waste water [Se(IV,VI) < 1,500 mg/L] containing sulfuric acid was introduced. This seems to be a promising process for selenium removal from acidic sulfate waste water containing high concentration levels of selenium to below 0.1 mg/L.
Keywords: aqueous chemistry; ferric selenite; calcium selenite and selenate; barium selenite and selenate; removal; selenium
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Nishimura, T.; Hata, R.; Hasegawa, F. Chemistry of the M (M=Fe, Ca, Ba)-Se-H2O Systems at 25 °C. Molecules 2009, 14, 3567-3588.
Nishimura T, Hata R, Hasegawa F. Chemistry of the M (M=Fe, Ca, Ba)-Se-H2O Systems at 25 °C. Molecules. 2009; 14(9):3567-3588.
Nishimura, Tadahisa; Hata, Ryosuke; Hasegawa, Fumihiko. 2009. "Chemistry of the M (M=Fe, Ca, Ba)-Se-H2O Systems at 25 °C." Molecules 14, no. 9: 3567-3588.