发酵秸秆吸附水中重金属离子性能研究

 生物吸附法是一种新兴的废水处理方法，高效廉价生物吸附剂的研发是生物吸附技术研究的关键之一。以甜高粱秸秆发酵产乙醇残渣（FSSR）为吸附剂，研究了其对Pb（Ⅱ）的吸附特性。研究结果表明，FSSR对Pb（Ⅱ）的吸附过程符合拟二级动力学模型，吸附过程是化学吸附过程。发酵后材料对Pb（Ⅱ）的吸附容量有显著提高，平衡时吸附容量由3.32 mg/g提高到6.92 mg/g。当温度由10℃升高到40℃时，FSSR对Pb（Ⅱ）最大吸附容量由5.92 mg/g提高到7.23 mg/g，等温吸附过程符合Langmuir模型。多元体系中FSSR对离子的选择性为Pb（Ⅱ）> Cu（Ⅱ）> Zn（Ⅱ）。发酵后材料有更多的活性官能团裸露在材料的表面，为吸附反应的发生提供了有利的条件，可以提高材料对金属离子的吸附容量。

Adsorption characteristics of heavy metal ions from aqueous solution by fermented stalk

The biosorption is a new technology, which can be widely applied for the removal of heavy metals from wastewater. The development of an efficient and low-cost adsorbent is a key in the biosorption technology. The adsorption performance of Pb(Ⅱ) by the fermented sweet sorghum stalks (FSSR) is discussed in this paper. The adsorption process is a chemical one and follows the pseudo-second order kinetics. After fermented, the equilibrium adsorption capacity of the material is increased from 3.32 mg/g to 6.92 mg/g. The isotherm adsorption is fitted well with the linear Langmuir model. When the temperature rises from 10℃ to 40℃, the maximum adsorption capacity of Pb (Ⅱ) is increased from 5.92 mg/g to 7.23 mg/g. In binary and ternary systems, the adsorption capacities are in the order of Pb(Ⅱ) > Cu (Ⅱ) > Zn(Ⅱ). There are more active functional groups on the surface of the stalk after fermentation, and these changes will be beneficial to the adsorption reaction and can improve the adsorption capacity.