鸭粪对Cu、Zn的吸附-解吸研究

为考察鸭粪中重金属的行为，采用一次平衡法，对鸭粪对Cu2+和Zn2+的吸附-解吸特性进行研究。结果表明，鸭粪对Cu2+、Zn2+的吸附热力学过程在24 h内达到平衡，其最大吸附量分别为1245.35 mg/kg，1129.34 mg/kg。分别用Langmuir型和Freundlich型吸附模式对吸附过程进行拟合，拟合的结果表明，鸭粪对Cu2+、Zn2+的吸附过程均较符合Langmuir吸附模式。用化学动力学中的一级反应方程lgC0/C=k1t和二级反应方程1/C-1/C0=k2t对该吸附动力学过程进行拟合，结果表明，鸭粪对Cu2+的吸附过程更符合二级反应规律，而对Zn2+的吸附过程更符合一级反应规律。鸭粪对Cu2+、Zn2+的解吸动力学过程表明，重金属的解吸量较小，且在较短时间内趋于稳定。

Adsorption and Desorption on Cu, Zn by Duck Manure

To investigate the activity of the heavy mental in manure of livestock and poultry, the adsorption/desorption processes of Cu2+ and Zn2+ by duck manure were studied. All adsorption thermodynamics processes reached equilibrium within 24 hours with the maximum adsorption capacity being 1245.35 mg/kg (Cu2+), 1129.34 mg/kg (Zn2+) respectively. The adsorption processes of both ions by duck manure fitted well with the Langmuir adsorption mode instead of Freundlich mode. Furthermore, the absorption of Cu2+ followed second-order kinetic law, while that of Zn2+ agreed with the first-order law. The desorption processes of Cu2+ and Zn2+ demonstrated that, desorption capacity was limited and the reaction could reach equilibrium within a rather short time.