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首页> 外文期刊>RSC Advances >Sustainable development of coconut shell activated carbon (CSAC) & a magnetic coconut shell activated carbon (MCSAC) for phenol ( 2-nitrophenol) removal
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Sustainable development of coconut shell activated carbon (CSAC) & a magnetic coconut shell activated carbon (MCSAC) for phenol ( 2-nitrophenol) removal

机译：可持续发展椰壳活性炭（CSAC）和苯酚（2-硝基苯酚）的磁性椰子壳活性炭（MCSAC）去除

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摘要

Slow pyrolysis coconut shell (CSAC) and magnetic coconut shell (MCSAC) activated carbons were prepared, characterized and used for aqueous 2-nitrophenol (2-NP) removal. Magnetization was carried out using a co-precipitation method. The chemical composition, surface properties and morphology were examined using proximate and ultimate analyses. The carbons were microporous with a BET surface area of 607 m(2) g(-1) (CSAC) and 407 m(2) g(-1) (MCSAC). Both batch and column studies were conducted. The carbons efficiently remediated 2-nitrophenol (2-NP) contaminated water at pH 4.0. Sorption equilibrium studies were conducted at 25, 35, and 45 degrees C. Experimental data were fitted to Langmuir, Freundlich, Sips, Temkin, Redlich-Peterson, Radke and Prausnitz, Toth, and Koble-Corrigan equations. Sips and Koble-Corrigan equations best fitted the 2-NP adsorption data. A pseudo-second-order model best described the kinetics data. Columbic interactions, hydrogen bond formations, pi-pi donor-acceptor interactions, and dipole-dipole interactions were the possible mechanisms for 2-NP removal. MCSAC was easily recovered from an aqueous system using an external magnet and successfully regenerated using methanol. Fixed-bed studies were conducted at room temperature with an initial 2-NP concentration of similar to 13 mg L-1, 2.0 g CSAC, pH 4.0 and a flow rate of 4 mL min(-1). A column capacity of 102.8 mg g(-1) was obtained. 2-NP desorption was also carried out under the same flow rate, and bed height using ten successive aliquots each containing 20 mL of methanol. The first aliquot of 20 mL of methanol desorbed 48% of the total 2-NP recovered and the rest in the further nine increments. These studies clearly demonstrated that developed carbons can serve as potential sorbents for phenol removal to substitute expensive commercial activated carbons.
机译：制备缓慢热解椰壳（CSAC）和磁性椰子壳（MCSAC）活性炭，其特征和用于除去2-硝基苯酚水溶液（2-NP）。使用共沉淀法进行磁化。使用近似和最终分析检查化学成分，表面性质和形态。碳是微孔，BET表面积为607m（2）g（-1）（Csac）和407m（2）g（-1）（MCSAC）。进行两种批次和柱研究。碳在pH 4.0时有效地修复了2-硝基苯酚（2-NP）污染的水。吸附均衡研究在25,35和45℃下进行。实验数据适用于Langmuir，Freundlich，Sips，Temkin，Redlich-Peterson，Reacke和Prausnitz，Toth和Koble-Corrigan方程。 SIP和Koble-Corrigan方程最能拟合2-NP吸附数据。伪二阶模型最能描述动力学数据。仔细酰胺相互作用，氢键形成，PI-PI供体 - 受体相互作用和偶极偶极相互作用是2-NP去除的可能机制。使用外部磁铁容易地从水性系统中恢复MCSAC并使用甲醇成功再生。在室温下进行固定床研究，初始2-NP浓度类似于13mg L-1，2.0g Csac，pH 4.0和4mL min（-1）的流速。获得柱容量为102.8mg（-1）。在相同的流速下也进行2-NP解吸，并且使用含有20ml甲醇的10个连续等分试样进行床高。第一种等份的20ml甲醇解吸48％的总2-NP回收，其余9个以九个增量。这些研究清楚地证明，发达的碳可以作为磷酚去除替代昂贵的商业活性炭的潜在吸附剂。

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  • 来源
    《RSC Advances》 |2016年第88期|共21页
  • 作者

    Sarswat Ankur; Mohan Dinesh;

  • 作者单位

    Jawaharlal Nehru Univ Sch Environm Sci New Delhi 110067 India;

    Jawaharlal Nehru Univ Sch Environm Sci New Delhi 110067 India;

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  • 正文语种 eng
  • 中图分类 化学;
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