マンガン酸化物Mn_2O_3に対する水溶液中カドミウムの吸着

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In the present study, the adsorption of cadmium on Mn2O3 in aqueous solution was investigated. The Mn2O3 was prepared by heating MnCO3 at 300∼800°C for 4.5 hours.The findings of the present study are as follows:(1) The Mn2O3 showed the ability to adsorb and concentrate cadmium from aqueous solution to levels reaching 23.2∼46.6mg · g-1 under the following conditions : heating temperature=300°C, solution pH=7, and cadmium concentration=1∼100mg · l-1. The surface area of the Mn2O3 was 50m2 · g-1.(2) The cadmium was eluted from the Mn2O3 by adding 0.5mol · l-1 HNO3, and the adsorption ability of the Mn2O3 recovered to nearly the previous level.(3) We attempted to remove cadmium from a sample (1l) of mining effluent (0.117mg · l-1 Cd) from the Yoshino mine in Akita prefecture, Japan using Mn2O3 (1g). The results showed that the cadmium concentration of the treated effluent decreased to under 0.001mg · l-1 in 2.5 hours.
社団法人　日本水環境学会の論文
2000-02-10