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首页> 外文期刊>RSC Advances >Preparation and characterization of an AC-Fe3O4-Au hybrid for the simultaneous removal of Cd2+, Pb2+, Cr3+ and Ni2+ ions from aqueous solution via complexation with 2-((2,4-dichloro-benzylidene)-amino)-benzenethiol: Taguchi optimization
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Preparation and characterization of an AC-Fe3O4-Au hybrid for the simultaneous removal of Cd2+, Pb2+, Cr3+ and Ni2+ ions from aqueous solution via complexation with 2-((2,4-dichloro-benzylidene)-amino)-benzenethiol: Taguchi optimization

机译：通过与2-（（2,4-二氯亚苄基）-氨基）-苯硫醇络合从水溶液中同时去除Cd2 +，Pb2 +，Cr3 +和Ni2 +离子的AC-Fe3O4-Au杂化物的制备和表征优化

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Activated carbon (AC) was magnetized with Fe3O4 nanoparticles (AC-Fe3O4-NPs) and loaded with Au nanoparticles (AC-Fe3O4-Au-NPs), and was fully characterized using different techniques such as XRD, XPS, VSM, TEM and SEM. 2-((2,4-Dichloro-benzylidene)-amino)-benzenethiol (DBABT), a complexing agent, was synthesized and characterized using H-1-NMR, ES-MS and FT-IR analysis. Subsequently, AC-Fe3O4-NPs was modified with DBABT and applied for the ultrasound-assisted removal of Cd2+, Pb2+, Cr3+ and Ni2+ ions via complexation with DBABT. The influences of variables such as reaction time and adsorbent mass (equilibrium) were optimized simultaneously. The method under optimum conditions was set at pH 5, concentrations of 5, 15, 25 and 25 mg L-1 for the Cd2+, Pb2+, Cr3+ and Ni2+ ions, respectively, 0.02 g for the adsorbent mass, 5 min sonication time and 6 mg L-1 for the concentration of DBABT, producing removal percentages of 80.59, 93.85, 68.52 and 81.68 for Cd2+, Pb2+, Cr3+ and Ni2+ ions, respectively. Analysis of real experimental equilibrium data at various concentrations of analytes reveals the efficiency of the Langmuir model for good representation of experimental data, with maximum mono-layer adsorption capacities of 185.22, 135.14, 188.70 and 133.34 mg g(-1) for Cd2+, Pb2+, Cr3+ and Ni2+ ions respectively. The experimental data at various real times reveal that in most situations the systems reach equilibrium at contact times lower than 20 min, while the data fitted well to a combination of a pseudo second order kinetic model and intraparticle diffusion.
机译：活性炭（AC）用Fe3O4纳米颗粒（AC-Fe3O4-NPs）磁化并负载有Au纳米颗粒（AC-Fe3O4-Au-NPs），并使用XRD，XPS，VSM，TEM和SEM等不同技术对其进行了全面表征。合成了络合剂2-（（2,4-二氯亚苄基）-氨基）-苯硫醇（DBABT），并使用H-1-NMR，ES-MS和FT-IR分析对其进行了表征。随后，用DBABT修饰AC-Fe3O4-NPs，并通过与DBABT的络合将其用于超声辅助去除Cd2 +，Pb2 +，Cr3 +和Ni2 +离子。同时优化了诸如反应时间和吸附剂质量（平衡）等变量的影响。最佳条件下的方法设定为pH 5，Cd2 +，Pb2 +，Cr3 +和Ni2 +离子的浓度分别为5、15、25和25 mg L-1，吸附剂质量的浓度为0.02 g，超声处理5分钟，且6毫克L-1的DBABT浓度，对Cd2 +，Pb2 +，Cr3 +和Ni2 +离子的去除率分别为80.59、93.85、68.52和81.68。在各种浓度的分析物上的真实实验平衡数据的分析表明，Langmuir模型可以很好地表示实验数据，对Cd2 +，Pb2 +的最大单层吸附容量为185.22、135.14、188.70和133.34 mg g（-1）。 ，Cr3 +和Ni2 +离子。在各种实时情况下的实验数据表明，在大多数情况下，系统在低于20分钟的接触时间即可达到平衡，而数据则很好地拟合了伪二级动力学模型和粒子内扩散的组合。

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