Facile Synthesis of Silver Bromide-Based Nanomaterials and Their Efficient and Rapid Selective Adsorption Mechanisms Toward Anionic Dyes
Facile Synthesis of Silver Bromide-Based Nanomaterials and Their Efficient and Rapid Selective Adsorption Mechanisms Toward Anionic Dyes
复制标题
溴化银基纳米材料的简易合成及其对阴离子染料的高效快速选择性吸附机制
DOI：
10.1021/acssuschemeng.6b00743
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发表时间：
2016
影响因子：
8.4
通讯作者：
Wu Ming-hong
中科院分区：
文献类型：
--
作者：
Tang Liang;Wang Jia-jun;Wang Liang;Jia Cheng-tao;Lv Geng-xin;Liu Ning;Wu Ming-hong
以十六烷基三甲基溴化铵（CTAB）为催化剂，采用Tollen试剂合成了AgBr-AgBr/CTAB纳米吸附剂，该吸附剂对阴离子表现出良好的亲和性，并将其用于水溶液中有机染料的吸附。采用XRD、SEM、TEM、XPS、FTIR、TGA、DLS和Zeta电位等手段对AgBr-AgBr/CTAB进行了表征。以亚甲基蓝（MB）、罗丹明B（RhB）、酸性红18（AR-18）、橙子G（OG）、靛蓝胭脂红（IC）和甲基橙子（MO）为模型，研究了AgBr-AgBr/CTAB对有机染料的吸附性能和容量。AgBr-AgBr/CTAB复合物对4种阴离子染料OG、AR-18、IC和MO溶液的吸附容量分别为87.43 ± 2.03 mg g-1、205.89 ± 2.12 mg g-1、140.42 ± 2.13 mg g-1和104.6 ± 1.59 mg g-1。该吸附剂对MB（2.99 ± 0.40 mg g-1）和RhB（2.96 ± 0.60 mg g-1）两种阳离子染料的吸附能力较弱。有趣的是，AgBr-AgBr/CTAB可有效地吸附二元阳离子-阴离子染料体系中的阴离子染料，具有较高的分离因子，且该吸附剂可重复使用5次，吸附容量大于95%。阴离子染料的去除符合准一级动力学和Langmuir吸附等温线模型，表明阴离子染料在所制备的材料上为单层吸附。为了进一步阐明吸附机理，还提供了基于第一性原理的理论计算。结果表明，R-SO 3-基团是吸附阴离子染料的活性中心，静电引力是吸附阴离子染料的主要贡献。
A novel adsorbent of AgBr–AgBr/CTAB nanomaterials, which was synthesized via Tollen’s reagent with the aid of hexadecyltrimethy ammonium bromide (CTAB), showed an excellent high affinity to anions and was used for removal of organic dyes in aqueous solutions. The synthesized AgBr–AgBr/CTAB was thoroughly characterized by XRD, SEM, TEM, XPS, FTIR, TGA, DLS as well as zeta potential measurements. The adsorption property and capacity of AgBr–AgBr/CTAB for organic dyes were evaluated using methylene blue (MB), rhodamine B (RhB), acid red 18 (AR-18), orange G (OG), indigo carmine (IC), and methyl orange (MO) as models. The adsorption capacity of AgBr–AgBr/CTAB complex toward four anionic dyes OG, AR-18, IC, and MO solutions was 87.43 ± 2.03 mg g–1, 205.89 ± 2.12 mg g–1, 140.42 ± 2.13 mg g–1, and 104.6 ± 1.59 mg g–1, respectively. On the other hand, this adsorbent exhibited little adsorption ability toward two cationic dyes, MB (2.99 ± 0.40 mg g–1) and RhB (2.96 ± 0.60 mg g–1). Interestingly, AgBr–AgBr/CTAB could be applied to efficiently adsorb anionic dyes from binary cationic–anionic dye systems with a high separation factor, and such adsorbent could be reused at least 5 times with adsorption capacities above 95%. The removal of anionic dyes followed pseudo-first-order kinetics and Langmuir isotherm model, indicating that anionic dyes were monolayerly adsorbed on our as-prepared materials. To further elucidate the adsorption mechanism, the theoretical calculation based on first-principles was also provided. The results suggested R-SO3–groups were the active sites and electrostatic attraction was the dominating contribution for the adsorption of anionic dyes.