Abstract：
Adsorption processes are being widely used by various researchers for the removal of heavy metals from waste streams and biochar has been frequently used as an adsorbent. In this study, a MgO-loaded biochar derived from Alternanthera philoxeroides (MAPB) was synthesized for the removal of Cu(II). Compared with other biochar absorbents, MAPB showed a relatively slow adsorption kinetics, but an effective removal of Cu(II) with a maximum sorption capacity of 1, 238 mg/g. The adsorption mechanism of Cu(II) by MAPB was mainly controlled by chemical precipitation as Cu2(OH)3NO3, complexation and ion replacement. Fixed bed column with MAPB packed in same dosage (1, 000 mg) and different bed depth (1.3, 2.6 and 3.9 cm) showed that the increased of bed depth by mixing MAPB with quartz sand could increase the removal of Cu(II). The fitted breakthrough (BT) models showed that mixing MAPB with support media could reduce the mass transfer rate, increase the dynamic adsorption capacity and BT time. Therefore, MAPB adsorbent act as a highly efficient long-term adsorbent for Cu(II) contaminated water treatment may have great ecological and environmental significance.
摘要：
各种研究人员广泛使用吸附方法从废物流中去除重金属，并且生物炭经常用作吸附剂。在这项研究中,合成了源自空心莲子草（MAPB）的MgO负载生物炭，用于去除Cu（II）。与其他生物炭吸收剂相比，MAPB表现出相对缓慢的吸附动力学，但有效去除Cu（II），最大吸附容量为1,238mg/g。MAPB对Cu(Ⅱ)的吸附机理主要由化学沉淀为Cu2(OH)3NO3、络合和离子置换控制。以相同剂量（1，000mg）和不同床深（1.3，2.6和3.9cm）填充MAPB的固定床柱表明，通过将MAPB与石英砂混合来增加床深可以增加Cu（II）的去除率。拟合突破（BT）模型表明，将MAPB与支持介质混合可以降低传质速率，增加动态吸附容量和BT时间。因此,MAPB吸附剂作为Cu（II）污染水处理的高效长期吸附剂可能具有重大的生态和环境意义。
