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第 36 卷第 12 期                            精   细   化   工                                 Vol.36, No.12
             2019 年 12 月                             FINE CHEMICALS                                 Dec.    2019


              水处理技术与环境保护
                      钛柱撑蒙脱石对镍离子和锰离子的吸附机理



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                                  宋   祥 ,庹必阳            1,2,3* ,赵徐霞 ,向海春
                 (1.  贵州大学  矿业学院,贵州  贵阳    550025;2.  贵州省非金属矿产资源综合利用重点实验室,贵州  贵
                 阳    550025;3.  喀斯特地区优势矿产资源高效利用国家地方联合工程实验室,贵州  贵阳    550025)

                 摘要:以钠基蒙脱石(Na-MMT)、钛酸四丁酯作基质材料,通过溶胶-凝胶法制备了钛柱撑蒙脱石(Ti-MMT)。
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                 利用 XRD、FTIR 及 SEM 对 Ti-MMT 进行了结构表征,考察了不同吸附条件对 Ti-MMT 吸附 Ni 和 Mn 的影
                                                                                      2+
                                                                                            2+
                 响,并重点分析水溶液 pH 对 Ti-MMT Zeta 电位及吸附的影响,探究了 Ti-MMT 吸附 Ni 和 Mn 的机理。结果
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                 表明:Ti-MMT 具有较大的晶面间距(d 001 =2.94 nm);pH 对吸附 Ni 与 Mn 有较大影响,去除率随初始水溶液
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                                               2+
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                 pH 增加而提高。在 pH=7,Ni 和 Mn 初始质量浓度为 50  mg/L,Ti-MMT 投加量分别为 5 和 9 g/L 时,Ni 在
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                 318 K 下吸附 120 min,吸附量可达 9.46 mg/g,去除率可达 94.59%,Mn 在 328 K 下吸附 180 min,吸附量可
                 达 4.82  mg/g,去除率可达 86.73%。此外,Ti-MMT 对两种离子的吸附都更符合 Temkin 等温吸附模型及拟二级
                 动力学模型,吸附过程受液膜扩散、颗粒内扩散等环节控制,且以离子交换的化学吸附为主。热力学分析表明,
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                            2+
                 Ti-MMT 对 Ni 的吸附属于自发吸热熵增过程,而 Mn 属于吸热熵增的非自发过程。
                 关键词:钛柱撑蒙脱石;吸附;二价镍离子;二价锰离子;水处理技术
                 中图分类号:X703.5      文献标识码:A      文章编号:1003-5214 (2019) 12-2482-09
                      Adsorption Mechanism of Titanium Pillared Montmorillonite for
                                            Nickel and Manganese Ions


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                              SONG Xiang , TUO Bi-yang  1,2,3* , ZHAO Xu-xia , XIANG Hai-chun
                 (1.  Mining College of Guizhou University, Guiyang  550025,  Guizhou, China;  2.  Guizhou Key Laboratory of
                 Comprehensive Utilization of Non-metallic Mineral Resources, Guiyang 550025, Guizhou, China; 3. National & Local
                 Joint Laboratory of Engineering for Effective  Utilization of Regional  Mineral Resources  from Karst Areas, Guiyang
                 550025, Guizhou, China)

                 Abstract:  Titanium  pillared  montmorillonite  (Ti-MMT)  was  prepared  by  sol-gel  method  using  sodium
                 montmorillonite (Na-MMT) and tetrabutyl titanate as matrix materials. The Ti-MMT were characterized by
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                 XRD, FTIR and SEM. Then, the effects of different adsorption conditions on the adsorption of Ni  and
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                 Mn  on Ti-MMT were investigated, and the effect of pH on Zeta potential and adsorption was emphatically
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                 analyzed. The mechanism of Ti-MMT adsorption of Ni  and Mn  was investigated. The results show that
                 Ti-MMT has a large interplanar spacing (d 001=2.94 nm); pH has a great influence on adsorption, and the
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                 removal rate of Ni  and Mn  increases with the increase of initial pH. At pH=7, the dosage of Ti-MMT is
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                 5 g/L, the initial mass concentration of Ni  is 50 mg/L, and the adsorption time is 120 min at 318 K, Ni
                 adsorption capacity can reach 9.46 mg/g, and the removal rate can reach 94.59%. At pH=7, the dosage of
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                 Ti-MMT is 9 g/L, the initial mass concentration of Mn  is 50 mg/L, and the adsorption time is 180 min at
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                 318 K, Mn  adsorption capacity can reach 4.82 mg/g, and the removal rate can reach 86.73%. In addition,
                 Ti-MMT  adsorption  of  both  ions  is  more  consistent  with  Temkin  isotherm  adsorption,  and  the  pseudo-
                 second-order  kinetics  model.  The  adsorption  process  is  controlled  by  liquid  membrane  diffusion  and
                 intra-particle diffusion, and ion exchange chemisorption is dominant. Thermodynamic analysis shows that

                 收稿日期:2019-04-18;  定用日期:2019-06-14; DOI: 10.13550/j.jxhg.20190333
                 基金项目:国家自然科学基金(51464007);贵州省科技厅联合资金项目(黔科合 LH 字[2015]7684);博士基金〔贵大人基合字(2013)
                 51 号〕
                 作者简介:宋   祥(1996—),男,硕士生,E-mail:1697181013@qq.com。联系人:庹必阳(1979—),男,博士,教授,E-mail:
                 yntby@163.com。
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