Shi Yunlong, Yu Changjiang, Liu Mengying, Lin Qiang, Lei Man, Wang Darun, Yang Mengwei, Yang Yuting, Ma Jian, Jia Zhengya
Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University No. 99 Longkunnan Road Haikou 571158 China
Key Laboratory of Natural Polymer Function Material of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University No. 99 Longkunnan Road Haikou 571158 China.
RSC Adv. 2021 Nov 17;11(58):36826-36835. doi: 10.1039/d1ra07373g. eCollection 2021 Nov 10.
In this study, a spherical Fe/C composite (AIBC) was successfully prepared carbonization of Fe-crosslinked sodium alginate. The removal capacity and mechanism of AIBC were evaluated for the adsorption of Pb(ii) from aqueous solution and compared with that of commercial nanoscale zero-valent iron (nZVI). The effects of the initial concentration, pH of Pb(ii) solution, the contact time, coexisting anions, and aging under air were investigated. The results showed that the pH had a strong impact on the adsorption of Pb(ii) by AIBC. The adsorption data for AIBC followed the Langmuir model, while the maximum adsorption capacity at pH 5 was 1881.73 mg g. The AIBC had a higher adsorption capability than nZVI, especially under the condition of relatively high Pb(ii) concentrations. The oxidation-reduction reaction between Fe and Pb(ii) was the main mechanism for the adsorption of Pb(ii) onto nZVI. AIBC converted the largest amount of Pb(ii) into PbO·HO/Pb(OH) mainly by generating Fe.
在本研究中，通过铁交联海藻酸钠的碳化成功制备了球形Fe/C复合材料（AIBC）。评估了AIBC对水溶液中Pb（II）的吸附去除能力和机制，并与商业纳米级零价铁（nZVI）进行了比较。研究了Pb（II）溶液的初始浓度、pH值、接触时间、共存阴离子以及在空气中老化的影响。结果表明，pH值对AIBC吸附Pb（II）有强烈影响。AIBC的吸附数据符合朗缪尔模型，在pH 5时最大吸附容量为1881.73 mg/g。AIBC比nZVI具有更高的吸附能力，特别是在相对较高的Pb（II）浓度条件下。Fe与Pb（II）之间的氧化还原反应是nZVI吸附Pb（II）的主要机制。AIBC主要通过生成Fe将大量的Pb（II）转化为PbO·H₂O/Pb（OH）₂ 。
