改性蚯蚓粪对重金属Cu²⁺的吸附性能研究

【摘要】 研究了蚯蚓粪吸附剂对溶液中Cu²⁺的吸附性能,实验结果表明,蚯蚓粪吸附剂具有较强的吸附能力,改性前后对低浓度Cu²⁺仍具有较强的去除效率;溶液pH=5时具有最大吸附率,前30 min内吸附速率极快,至120 min基本达到最大吸附量;吸附温度在20⁴0℃之间以物理表面吸附为主,40⁵0℃之间化学吸附能力增强;单位吸附剂对溶液Cu²⁺的平衡吸附量与Cu²⁺的初始浓度的关系符合Langmuir吸附等温线方程。在初始Cu²⁺浓度为0.002 mol/L,温度50℃,时间120 min时,平衡吸附量分别为3.99 mg/g和2.28 mg/g。更多还原

【Abstract】 This paper is aimed to study on the performance of vermicompost adsorbing copper ions from aqueous solution. Experimental results show that vermicompost adsorbent has strong adsorption capacity. Activated and non-activated vermin-compost have a strong copper ion removal efficiency for the low-concentration solution;and the optimum range of pH value for absorbing Cu²⁺with the absorber is 5,a very fast rate of adsorption in 30 minutes,after 120 minutes, the adsorption reached balance state basically and then the adsorption amount did not change along with the extending of time; based on the physical adsorption between 20℃ to 40℃, and then the chemical adsorption strengthen between 40℃ to 50℃. The relationship between equilibrium adsorption capacity and initial concentration of copper ions on unit adsorbent is in accordance with Langmuir adsorption isotherm equation. Under the conditions of Cu²⁺is 0.002 mol/L,50℃ and adsorption time is 120 minutes, the equilibrium adsorption amount were 3.99 mg/g and 2.28 mg/g.更多还原