鐵、錳和鋁氧化物吸附硒的行為研究
[Abstract]:In supergene environment, adsorption is one of the important ways for selenium to enter solid deposition environment. In order to clarify the adsorption behavior of selenium and oxygen anion group and its influencing factors, hematite, manganese dioxide and alumina were selected as adsorbents. Batch experiments were used to study the solution pH,. The effect of selenium concentration and reaction time on the adsorption of selenium was studied. The results show that in order to achieve the ideal adsorption effect, the pH of the solution should be controlled in the range of 4 ~ 6, and at room temperature and pH = 5, hematite can be obtained. The saturated adsorption capacity of manganese dioxide and alumina for selenite is about 1.62 脳 10-3 (0.33 脳 10-3) and 1.07 脳 10-3, respectively. The saturated adsorption capacity for selenite is about 1.0 脳 10-3 (0.55 脳 10-3), respectively. The adsorption rules are in accordance with the Langmuir isothermal adsorption equation, and the theoretical maximum adsorption capacity is basically consistent with the experimental maximum adsorption capacity. The experimental data were fitted with four kinetic models: quasi-first-order kinetics, quasi-second-order kinetics, Elvoich equation and intra-particle diffusion model. It was found that the correlation of selenium adsorption process expressed by quasi-second-order kinetic equation was the best. It is shown that the adsorption process of seleno anions on the surface of iron, manganese and aluminum oxides is complex, which may involve physical adsorption and particle diffusion on the surface.
【作者單位】: 中國科學(xué)院地球化學(xué)研究所環(huán)境地球化學(xué)國家重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院大學(xué);中國地質(zhì)大學(xué)(北京)地質(zhì)過程與礦產(chǎn)資源國家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國家自然科學(xué)基金資助項(xiàng)目(編號:41273029) 國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃課題(編號:2014CB238903)
【分類號】:O647.3;P579
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