模拟酸雨对氧化锰吸附砷(Ⅲ)的解吸行为研究

以合成的氧化锰为吸附剂研究了酸雨pH值、酸雨离子强度、解吸时间和解吸次数等因素对模拟酸雨解吸砷(Ⅲ)的影响。实验结果表明:氧化锰对砷(Ⅲ)吸附容量较大,等温平衡吸附量为:48.38 mg/g。模拟酸雨的pH值与离子强度对砷(Ⅲ)的解吸影响不大;解吸反应在90 min后基本达到平衡,平衡解吸量为2.69×10-2mg/g;随解吸次数的增加解吸量变化不大。氧化锰对砷(Ⅲ)的吸附主要是专性的配位吸附,吸附砷(Ⅲ)后难以被模拟酸雨解吸。

Study on desorption of As (III) on manganese oxide by simulant acid rain

Manganese oxide as a adsorbent was synthesized, and the pH value,ionic strength of simulant acid rain,the reaction time and the times of the desorption of As(III) were studied. The results showed that the manganese oxide had stronger adsorption capacity of arsenic (III) and the saturated adsorption capacity of arsenic (III)was 48.38 mg/g. The pH value and the ionic strength of simulant acid rain had little influence on desorption of As (III). The reaction balance time was 90 minutes and the balance desorption capacity of arsenic (III) was 2.69 × 10~(-2)mg/g. The results also showed that desorption capacity of arsenic (III) had little change with adding the times of desorption. The main adsorption forms of As(III) on manganese oxide was complex adsorption and the adsorbent As(III) was eluted difficultly by simulant acid rain.