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首页> 外文期刊>Microporous and mesoporous materials: The offical journal of the International Zeolite Association >Adsorption of lead ion on amino-functionalized fly-ash-based SBA-15 mesoporous molecular sieves prepared via two-step hydrothermal method
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Adsorption of lead ion on amino-functionalized fly-ash-based SBA-15 mesoporous molecular sieves prepared via two-step hydrothermal method

机译：通过两步水热法制备氨基官能化粉煤灰SBA-15介孔分子筛对铅离子的吸附

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Using an alkali two-step hydrothermal method, SBA-15 mesoporous molecular sieves were prepared from fly ash used in a thermal power plant in Inner Mongolia (China). The effect of alkali solution (i.e., NaOH), added in different amounts at 95 degrees C, on the desilication rate of the ash was determined. During the 48-h hydrothermal crystallization process at 110 degrees C, sieves were obtained using Na2SiO3 solution as the silicon source, hydrochloric acid to adjust the pH value, and P123 (PEO-PPO-PEO) as a template. Amino-functionalized molecular sieves were prepared at 120 degrees C, using 3-aminopropyltriethoxysilane as a modifier and toluene as the solvent. The prepared SBA-15 and NH2-SBA-15 molecular sieves were characterized via X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, and N-2 adsorption. The effects of adsorption time, temperature, pH value, and the initial concentration of lead ions (Pb2+) on the efficiency of Pb2+ removal were investigated using NH2-SBA-15 as an adsorbent. The results revealed that, like its SBA-15 counterpart, NH2-SBA-15 has a typical two-dimensional hexagonal pore structure, with lower specific surface area, average pore diameter, and pore volume compared with its SBA-15 counterpart. Furthermore, the Pb2+-removal efficiency increased gradually with increasing adsorption time, adsorption temperature, and initial concentration of Pb2+. However, when the pH value was increased, the efficiency increased initially and decreased thereafter. The maximum removal rate (>98%) after 60 min at 30 degrees C was obtained at a pH value of 5 and a Pb2+ concentration of 100 mg/L. The adsorption process of Pb2+ and the corresponding adsorption isotherm were well described by the second-order kinetics model and the Langmuir isotherm model, respectively, and an equilibrium adsorption amount of 131 mg/g was realized. The fly-ash-based SBA-15 mesoporous molecular sieve adsorbent, developed and subsequently modified in the present study, exhibited improved selectivity and adsorption capacity, and was less expensive than existing adsorbents. This sieve can provide effective technical support for control of the industrial heavy-metal-contaminated wastewater, and provides a new approach for the efficient utilization of fly ash. (C) 2017 Elsevier Inc. All rights reserved.
机译：使用碱二步水热法，由在内蒙古（中国）的火热厂中使用的粉煤灰制备SBA-15中孔分子筛。确定碱溶液（即NaOH）的效果，在95℃下添加不同量的灰分的溶解速率。在110℃下的48-H水热结晶过程中，使用Na 2 SiO 3溶液作为硅源，盐酸得到筛，以调节pH值，以及P123（PEO-PPO-PEO）作为模板。氨基官能化分子筛在120℃下使用3-氨基丙基三乙氧基硅烷制备，作为改性剂和甲苯作为溶剂。通过X射线衍射，透射电子显微镜，傅里叶变换红外光谱和N-2吸附来表征制备的SBA-15和NH 2-SBA-15分子筛。使用NH 2-SBA-15作为吸附剂研究了吸附时间，温度，pH值和铅离子的初始浓度（Pb2 +）对Pb2 +去除效率的影响。结果表明，与其SBA-15对应物一样，NH 2-SBA-15具有典型的二维六方孔结构，与其SBA-15对应物相比，具有较低的比表面积，平均孔径和孔体积。此外，PB2 + - 氧化效率随着吸附时间，吸附温度和Pb2 +的初始浓度的增加而逐渐增加。然而，当pH值增加时，最初效率增加并随后减少。在30℃下60分钟后的最大去除率（> 98％）在pH值为5和100mg / L的PB2 +浓度下获得。 PB2 +和相应的吸附等温线的吸附过程分别通过二阶动力学模型和Langmuir等温模型很好地描述，实现了131mg / g的平衡吸附量。在本研究中发育和随后改性的粉煤灰基SBA-15中孔分子筛吸附剂，其选择性和吸附能力提高，并且比现有的吸附剂便宜。该筛子可以为控制工业重金属污染的废水提供有效的技术支持，并提供了一种高效利用粉煤灰的新方法。 （c）2017年Elsevier Inc.保留所有权利。

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