Effectively removing indole-3-butyric acid from aqueous solution with magnetic layered double hydroxide-based adsorbents
Effectively removing indole-3-butyric acid from aqueous solution with magnetic layered double hydroxide-based adsorbents
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利用磁性层状双氢氧化物吸附剂有效去除水溶液中的吲哚-3-丁酸
DOI：
10.1016/j.jhazmat.2020.124446
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发表时间：
--
影响因子：
13.6
通讯作者：
Ru-Song Zhao
中科院分区：
文献类型：
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作者：
Ling-Xi Zhao;Hua Xiao;Ming-Hui Li;Meng Xie;Na Li;Ru-Song Zhao
通过不同条件合成了金属组分为Mg（II）Al（III）的磁性层状双氢氧化物基材料（MLDHs），并将其作为植物激素吲哚-3-丁酸（IBA）的吸附剂。通过XRD、SEM、TEM、FTIR、BET、Zeta电位和VSM等表征手段对MLDHs的形貌特征进行了研究。结果表明，以氨水为碱源，采用共沉淀法合成的MLDH-1吸附容量最大，可达522.6mg/g。在3.0-9.0的pH范围内的吸附程度没有观察到明显的变化。从经济角度考虑，选择1.0g/L的MLDH-1复合材料为最佳工艺参数。在一定的吸附剂浓度（Cs）下，其动力学和吸附等温线分别符合准二级动力学模型和Liu等温线模型。吸附的样品可以很容易地用NaNO 3磁性分离和再生。吸附过程为自发放热过程，包括层间阴离子交换和层间表面吸附两个路径阶段。该研究有助于评价多金属水滑石对IBA的吸附能力，并有助于公众了解吸附过程的机理。
The magnetic layered double hydroxide-based materials (MLDHs) with the metal composition of Mg(II)Al(III) were synthesized by different conditions as the adsorbent for removal of a phytohormone, indole-3-butyric acid (IBA). The morphological characteristics of MLDHs were studied through various characterization methods such as XRD, SEM, TEM, FTIR, BET, Zeta-potential and VSM. The adsorption results showed that the adsorption capacity of MLDH-1 synthesized by co-precipitation method with ammonia as the base source was the best (maximum 522.6 mg/g). The extent of adsorption in the pH range of 3.0–9.0 was observed to be no noticeable change. From the economical point of view, 1.0 g/L MLDH-1 composites were selected as optimum parameter. For a given adsorbent concentration (Cs), its kinetics and adsorption isotherm followed the pseudo-second-order and Liu isotherm model, respectively. The adsorbed sample can be easily magnetically separated and regenerated with NaNO3. The adsorption process was spontaneous and exothermic, including two path stages: surface adsorption of lamellar and interlayer anion exchange. The research makes a contribution to evaluating the ability of MLDHs in IBA removal and helping the public to understand the mechanism of adsorption process.