Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 29    No. 8    August 2019

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Selenium(VI) removal from caustic solution by synthetic Ca-Al-Cl layered double hydroxides
Shao-dong XU, Dong LI, Xue-yi GUO, Wen YAN, Jie GAO

School of Metallurgy and Environment, Central South University, Changsha 410083, China

Abstract:To extract selenium(VI) from the highly caustic leachate of copper anode slime, the Ca-Al-Cl layered double hydroxides (Ca-Al-Cl-LDHs) with a formula of Ca2Al(OH)6Cl·2H2O by three co-precipitation methods were synthesized. A plate-like morphology and hexagonal crystal structure with typical mineral phases and functional groups were identified by the FESEM, XRD, FTIR, BET and XPS analysis. The forward feeding sample exhibits the best adsorption capacity of Se(VI). The factor experiments then reveal a favorable adsorption process with low temperature, low NaOH concentration and high adsorbent dosage. Furthermore, the adsorption kinetics and isotherm parameters can be well described by the Langmuir isotherm and the pseudo-second-order models, respectively. Accordingly, the maximum adsorption amount of Se(VI) onto Ca-Al-Cl-LDHs reaches 188.6 mg/g at 50 °C.


Key words: copper anode slime; layered double hydroxide; selenium adsorption; kinetics; isotherm

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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