污泥基磁性吸附剂制备及其去除废水中铜的研究

Preparation of Sludge‑based Magnetic Adsorbent and Its Removal of Copper from Wastewater

为探究污泥基吸附剂材料对铜离子的去除效果,将市政污泥、山竹果皮废弃物、四氧化三铁和碳酸钾按4∶1∶2.5∶0.5的质量比相结合,在400℃条件下炭化1 h后制得高效磁性污泥基吸附剂,进一步化学改性后得到羧基化磁性污泥基吸附剂。将其用于含铜废水的处理,并通过扫描电镜等进行表征。结果表明,对于50 mL铜离子溶液(50 mg/L),温度为25℃、pH为5.0、吸附剂投加量为25 mg是最优吸附条件。准二级动力学模型和Langmuir吸附等温线模型可以很好地描述吸附过程,对铜的最大吸附量为142.65 mg/g。同等条件下,相较于未改性前,羧基化改性磁性污泥基吸附剂的吸附容量提高约10%,平衡时间缩短约120 min。

A high‑efficiency sludge‑based magnetic adsorbent was prepared under the following parameters:mass ratio of municipal sludge,mangosteen peel waste,ferric oxide and potassium carbonate of 4∶1∶2.5∶0.5,and carbonization at 400℃for 1 h.After further chemical modification,a carboxylated sludge‑based magnetic adsorbent was prepared for adsorption of copper‑containing wastewater and characterized by scanning electron microscopy,so as to explore the performance of the sludge‑based adsorbent materials for the removal of copper ions.For 50 mL of copper ion solution(50 mg/L),the optimal adsorption conditions were as follows:temperature of 25℃,pH of 5.0 and adsorbent dosage of 25 mg.The pseudo‑second order kinetic and Langmuir isotherm model could fit the adsorption experiment well,and the maximum adsorption capacity was 142.65 mg/g.Under the same conditions,the adsorptive capacity of the modified carboxylated sludge‑based magnetic adsorbent was increased by approximately 10%and the equilibrium time was shortened by approximately 120 min compared with those of the unmodified adsorbent.