Application of ZnO nanorods loaded on activated carbon for ultrasonic assisted dyes removal: Experimental design and derivative spectrophotometry method
Application of ZnO nanorods loaded on activated carbon for ultrasonic assisted dyes removal: Experimental design and derivative spectrophotometry method
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DOI：
10.1016/j.ultsonch.2016.05.004
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发表时间：
2016-11-01
影响因子：
8.4
通讯作者：
Asfaram, Arash
中科院分区：
文献类型：
--
作者：
Ansari, Fatemeh;Ghaedi, Mehrorang;Asfaram, Arash
介绍了一种利用ZnO纳米棒负载活性炭（ZnO- nrs - ac）吸附溴甲酚绿（BCG）和伊红Y （EY）的方法。采用超声辅助湿化学方法合成了该材料，并用FE-SEM、TEM、BET和XRD对其进行了表征。采用响应面法的中心组合设计，考察了pH（2.0 ~ 10.0）、BCG浓度（4 ~ 20 mg L-1）、EY浓度（3 ~ 23 mg L-1）、吸附剂用量（0.01 ~ 0.03 g）、超声时间（1 ~ 5 min）和离心时间（2 ~ 6 min）作为主要和交互作用因素的贡献程度。采用方差分析（ANOVA）对实验数据进行方差分析，以pH、BCG浓度、EY浓度、吸附剂用量、超声处理和离心时间分别设定为6.0、9 mg L-1、10 mg L-1、0.02 g、4和4 min为最佳操作条件。在此条件下，染料吸附效率可达99.5%以上。通过5次试验验证了最佳点的适宜性和良好的预测性，结果表明RSD% < 3%， t检验证实了最佳点的拟合质量。实验数据符合Langmuir等温线方程，脱除过程符合拟二级动力学。实验得到的ZnO-NRs-AC对BCG和EY的最大吸附量分别为57.80和61.73 mg g（-1）。通过颗粒内扩散解释了边界层扩散的去除机理。(C) 2016 Elsevier B.V.版权所有
A method based on application of ZnO nanorods loaded on activated carbon (ZnO-NRs-AC) for adsorption of Bromocresol Green (BCG) and Eosin Y (EY) accelerated by ultrasound was described. The present material was synthesized under ultrasound assisted wet-chemical method and subsequently was characterized by FE-SEM, TEM, BET and XRD analysis. The extent of contribution of conventional variables like pH (2.0-10.0), BCG concentration (4-20 mg L-1), EY concentration (3-23 mg L-1), adsorbent dosage (0.01-0.03 g), sonication time (1-5 min) and centrifuge time (2-6 min) as main and interaction part were investigated by central composite design under response surface methodology. Analysis of variance (ANOVA) was adapted to experimental data and guide the best operational conditions mass by set at 6.0, 9 mg L-1, 10 mg L-1, 0.02 g, 4 and 4 min for pH, BCG concentration, EY concentration, adsorbent dosage, sonication and centrifuge time, respectively. At these specified conditions dye adsorption efficiency was higher than 99.5%. The suitability and well prediction of optimum point was tested by conducting five experiments and respective results revel that RSD% was lower than 3% and high quality of fitting was confirmed by t-test. The experimental data were best fitted in Langmuir isotherm equation and the removal followed pseudo second order kinetics. The experimentally obtained maximum adsorption capacities were estimated as 57.80 and 61.73 mg g(-1) of ZnO-NRs-AC for BCG and EY respectively from binary dye solutions. The mechanism of removal was explained by boundary layer diffusion via intraparticle diffusion. (C) 2016 Elsevier B.V. All rights reserved.