Page 59 - 《精细化工》2022年第6期
P. 59

第 39 卷第 6 期                             精   细   化   工                                  Vol.39, No.6
             2022 年 6 月                              FINE CHEMICALS                                 June  2022


              功能材料
                     球形零价铁生物炭吸附 Cd(Ⅱ)的性能和机制



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              石云龙 ,宋小毛 ,于长江 ,林   强 ,马皓月 ,邹   欢 ,钟佳莉 ,贾振亚
                 〔1.  海南师范大学  化学与化工学院  海南省水环境污染治理与资源化重点实验室  热带药用资源化学教育
                 部重点实验室  海口市天然高分子功能材料重点实验室,海南  海口   571158;2.墣锦环境工程(海南)有
                 限公司,海口 570100;3.  海南环泰检测技术有限公司,海南  海口  571158〕
                 摘要:将海藻酸铁在高温无氧条件下热解制备了球形零价铁生物炭(ZVIBC),并用于 Cd(Ⅱ)的吸附。采用 SEM、
                 TEM、N 2 吸附-脱附、磁性测量系统(VSM)、FTIR、XRD、EDS、XPS 对其进行了表征。考察了 Cd(Ⅱ)溶液的
                 pH、Cd(Ⅱ)初始质量浓度、吸附时间、背景离子、空气中老化时间对 Cd(Ⅱ)吸附量的影响,探讨了 ZVIBC 对
                 Cd(Ⅱ)的吸附机理。结果显示,pH 对 ZVIBC 吸附 Cd(Ⅱ)有显著的影响,最佳吸附 pH 为 4。ZVIBC 吸附 Cd(Ⅱ)
                 的过程符合 Langmuir 模型,拟合的饱和吸附量为 240 mg/g。主要吸附机理为:活性官能团(O—H、C—O、C==C、
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                 C==O、—COO)与 Cd(Ⅱ)形成配合物,以及 Cd(Ⅱ)与 Fe 生成 Cd(OH) 2 沉淀。
                 关键词:海藻酸钠;生物炭;零价铁;Cd(Ⅱ);吸附机理;功能材料
                 中图分类号:O636.9;TQ424      文献标识码:A      文章编号:1003-5214 (2022) 06-1125-09



                            Mechanism study on spherical zero-valent iron/biochar
                                 composites performance for Cd(Ⅱ) adsorption


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                          SHI Yunlong , SONG Xiaomao , YU Changjiang , LIN Qiang , MA Haoyue ,
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                                          ZOU Huan , ZHONG Jiali , JIA Zhenya
                 [1.  Key Laboratory of Natural Polymer Function  Material of Haikou City, Key Laboratory of Tropical Medicinal Resource
                 Chemistry of Ministry of Education, Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan province,
                 College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, Hainan, China; 2. Pujin
                 Environmental Engineering (Hainan) Co., Ltd, Haikou 570100,Hainan,China; 3. Hainan Huantai  Inspection Technology
                 Co., Ltd., Haikou 571158, Hainan, China]
                 Abstract: A spherical  zero-valent  iron (ZVI)/biochar  composite (ZVIBC), successfully prepared  via
                 anaerobic pyrolysis of ferric alginate at high temperature, was employed for the adsorption of Cd(Ⅱ). The
                 synthesized ZVIBC  were firstly  characterized  by SEM, TEM,  N 2 adsorption-desorption, magnetic
                 measuring system, FTIR, XRD, EDS and XPS. Then, the mechanism of ZVIBC for Cd(Ⅱ) adsorption was
                 investigated and discussed by probing the effects of Cd(Ⅱ) solution pH, Cd(Ⅱ) initial mass concentration,
                 adsorption time, background ions, and air aging time on the adsorption capability. The results indicated that
                 the pH exhibited strong impact on the adsorption capacity with an optimum value of 4. Meanwhile, it was
                 also found that the adsorption  process conformed to the Langmuir  model with the fitting maximum
                 adsorption capacity of 240 mg/g. The main adsorption mechanism could be attributed to the complexes
                 formed between active functional groups (O—H, C—O, C==C,  C==O,  —COO) and Cd(Ⅱ), as well as
                                                        2+
                 Cd(OH) 2 precipitation generated Cd(Ⅱ) with Fe  on ZVIBC surface.
                 Key words: sodium alginate; biochar; zero-valent iron; Cd(Ⅱ); adsorption mechanism; functional materials



                 镉(Cd)是一种剧毒重金属,即使低浓度的镉                         子交换、膜处理、溶剂萃取、吸附等,其中吸附是
                                                                                   [2]
                                                                                                 [3]
                                                                                                          [4]
            也可能对人体造成危害,进而导致癌症等严重的疾                             应用最广泛的处理方法 。氧化石墨烯 、凹凸棒 、
                                                                                         [8]
              [1]
                                                                                                       [9]
            病 。重金属废水处理方法主要包括化学沉淀、离                             改性生物炭     [5-7] 、羟基磷灰石 、含氮大分子 、离

                 收稿日期:2021-12-06;  定用日期:2022-03-14; DOI: 10.13550/j.jxhg.20211254
                 基金项目:海南省科技专项资助(ZDYF2020079);海南省自然科学基金(219QN208);海口市重点科技计划项目(2020-015)
                 作者简介: 石云龙(1997—),男,硕士生,E-mail:xuebao7485@163.com。联系人:于长江(1983—),男,博士,E-mail:ycjhnsfdx@163.com。
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