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首页> 外文期刊>Journal of Polymers and the Environment >Adsorptive Removal of Malachite Green Chloride and Reactive Red-198 from Aqueous Solutions by Using Multiwall Carbon Nanotubes-Graft-Poly (2-acrylamido-2-methyl-1-propanesulfonic acid)
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Adsorptive Removal of Malachite Green Chloride and Reactive Red-198 from Aqueous Solutions by Using Multiwall Carbon Nanotubes-Graft-Poly (2-acrylamido-2-methyl-1-propanesulfonic acid)

机译：多壁碳纳米管-接枝-聚（2-丙烯酰胺基-2-甲基-1-丙烷磺酸）从水溶液中吸附去除孔雀绿氯化物和活性红198

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The multiwall carbon nanotubes (MWCNTs) were modified by 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) via grafting reaction and gamma-rays of Co-60 source was used as initiator. The outcome product was called hydroxyethylated (HOEt-MWCNTs) graft poly(AMPS) and abbreviated as HOEt-MWCNTs-g-PAMPS. The parameters that affected the grafting yield were optimized. The maximum grafting obtained was similar to 20 %. HOEt-MWCNTs-g-PAMPS were characterized by Fourier transform infra red, scanning electron microscopy, high resolution transmission electron microscopy, thermal gravimetric analysis. The adsorptive removals of malachite green chloride (MGC) and reactive red 198 (RR-198) onto HOEt-MWCNTs-g-PAMPS were studied at variable conditions. The adsorption isotherms were analyzed using Langmuir, Redlich-Peterson, Freundlich, Khan and Sips models. The results referred that Sips model is the best fitting to adsorption of MGC and Freundlich model is the best fitting to RR-198 adsorption. The monolayer coverage capacities of HOEt-MWCNTs-g-PAMPS for MGC and RR-198 dyes were found 172 and 323 mg g(-1), respectively. The rate of kinetic adsorption processes of MGC and RR-198 onto HOEt-MWCNTs-g-PAMPS were described by using pseudo-first order, pseudo-second order and intraparticle diffusion models. The pseudo-first order and pseudo-second order models were the best choice among the kinetic models to depict the adsorption behaviors of MGC and RR-198 dyes onto HOEt-MWCNTs-g-PAMPS, respectively. Further, the effect of temperature on the adsorption isotherms was investigated and the thermodynamic parameters were obtained. The results indicated that the adsorption process is spontaneous and endothermic. The values of Delta GA degrees varied in range with the mean values showing a gradual increase from -3.17 to -3.64 kJ mol(-1) for MGC and -3.36 to -3.73 kJ mol(-1) for RR-198. The reusability and regeneration of adsorbent were investigated. The outcome data referred to that the efficiency of adsorbent > 98 %. The outline results declared that there is a good potentiality for the HOEt-MWCNTs-g-PAMPS to be used as an adsorbent for the removal of MGC and RR-198 from aqueous solutions.
机译：用2-丙烯酰胺基-2-甲基-1-丙烷磺酸（AMPS）通过接枝反应对多壁碳纳米管（MWCNTs）进行改性，并以Co-60源的γ射线作为引发剂。所得产物称为羟乙基化（HOEt-MWCNTs）接枝聚（AMPS），缩写为HOEt-MWCNTs-g-PAMPS。优化了影响接枝产率的参数。获得的最大接枝率接近20％。 HOEt-MWCNTs-g-PAMPS的特征在于傅立叶变换红外光谱，扫描电子显微镜，高分辨率透射电子显微镜，热重分析。在不同条件下研究了孔雀石绿氯化物（MGC）和活性红198（RR-198）对HOEt-MWCNTs-g-PAMPS的吸附去除。使用Langmuir，Redlich-Peterson，Freundlich，Khan和Sips模型分析吸附等温线。结果表明，Sips模型最适合MGC的吸附，Freundlich模型最适合RR-198的吸附。 HOEt-MWCNTs-g-PAMPS对MGC和RR-198染料的单层覆盖能力分别为172和323 mg g（-1）。利用伪一级，伪二级和颗粒内扩散模型描述了MGC和RR-198在HOEt-MWCNTs-g-PAMPS上的动力学吸附速率。在动力学模型中，拟一阶和拟二阶模型是最好的选择，分别描述了MGC和RR-198染料在HOEt-MWCNTs-g-PAMPS上的吸附行为。此外，研究了温度对吸附等温线的影响，并获得了热力学参数。结果表明，吸附过程是自发的且吸热的。 Delta GA度的值在范围内变化，平均值显示MGC从-3.17逐渐增加到-3.64 kJ mol（-1），RR-198则从-3.36逐渐增加到-3.73 kJ mol（-1）。研究了吸附剂的可重复使用性和再生性。结果数据表明吸附剂效率> 98％。概述结果表明，HOEt-MWCNTs-g-PAMPS用作从水溶液中去除MGC和RR-198的吸附剂的潜力很大。

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