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Coconut-based activated carbon fibers for efficient adsorption of various organic dyes

机译：基于椰子的活性炭纤维，用于有效吸附各种有机染料

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摘要

In this study, using coconut fibers as raw material, activated carbon fibers were prepared via carbonization and KOH activation processes. The morphology, composition, specific surface area, pore structure and thermal stability of the resulting activated carbon fibers were systematically characterized. It was found that the activation process increases the specific surface area of carbon fibers to a greater extent via formation of a large number of micropores (0.7-1.8 nm) and a certain amount of slit-shaped mesopores (2-9 nm). The specific surface area and the pore volume of the activated carbon fibers reach 1556 m(2) g(-1) and 0.72 cm(3) g(-1), respectively. The activation process can also decompose the tar deposits formed after the carbonization process by pyrolysis, making the surface of the activated carbon fibers smoother. To study the adsorption properties of the as-prepared activated carbon fibers, the adsorption capacities and adsorption kinetics of various organic dyes including methylene blue, Congo red and neutral red were investigated. The adsorption capacities of the dyes increased with the increasing initial dye concentrations, and varied greatly with the pH value of the system. In methylene blue and neutral red systems, the adsorption capacities reach the maximum at pH 9, and in the Congo red system, it reaches the maximum at pH 3. The adsorption capacities of the activated carbon fibers in methylene blue, Congo red and neutral red systems reached equilibrium at 150, 120, and 120 min, and the maximum adsorption capacities were 21.3, 22.1, and 20.7 mg g(-1), respectively. The kinetics of the adsorption process was investigated using three models including pseudo-first-order, pseudo-second-order and intraparticle diffusion models. The results indicated that the dynamic adsorption processes of coconut-based activated carbon fibers to methylene blue, Congo red and neutral red were all in accordance with the second-order kinetic model, and the equations are as follows: t/Q(t) = 0.1028 + t/21.3220, t/Q(t) = 0.1128 + t/21.5982 and t/Q(t) = 0.0210 + t/20.6612.
机译：在本研究中，使用椰子纤维作为原料，通过碳化和KOH活化方法制备活性炭纤维。系统地表征了所得活性炭纤维的形态，组合物，比表面积，孔隙结构和热稳定性。发现活化过程通过形成大量微孔（0.7-1.8nm）和一定量的狭缝形的中孔（2-9nm），激活过程在更大程度上增加碳纤维的比表面积。活性炭纤维的比表面积和孔体积分别达到1556m（2 )g（-1）和0.72cm（3 )g（-1）。活化过程还可以通过热解，使活性炭纤维的表面更平稳地分解碳化过程后形成的焦油沉积物。为了研究制备的活性炭纤维的吸附性能，研究了各种有机染料的吸附能力和吸附动力学，包括亚甲基蓝，刚果红色和中性红色。染料的吸附容量随着初始染料浓度的增加而增加，并随着系统的pH值而变化。在亚甲基蓝色和中性的红色系统中，吸附容量在pH 9的最大值达到最大值，并且在刚果红色系统中，它达到了pH3的最大值。亚甲基蓝色，刚果红色和中性红色的活性炭纤维的吸附能力系统达到150,120和120分钟的平衡，最大吸附能力分别为21.3,22.1和20.7mg（-1）。使用包括伪一阶，伪二阶和粒地区扩散模型的三种模型来研究吸附过程的动力学。结果表明，基于椰子的活性炭纤维对亚甲基蓝，刚果红色和中性红色的动态吸附过程全部符合二阶动力学模型，方程式如下：T / Q（T）= 0.1028 + T / 21.3220，T / Q（T）= 0.1128 + T / 21.5982和T / Q（T）= 0.0210 + T / 20.6612。

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  • 来源
    《RSC Advances》 |2018年第74期|共12页
  • 作者

    Zhang Ling; Tu Ling-yu; Liang Yan; Chen Qi; Li Ze-sheng; Li Chun-hai; Wang Zhi-hui; Li Wen;

  • 作者单位

    Guangdong Univ Petrochem Technol Food Sci Innovat Team Guangdong Higher Educ Inst Technol Lingnan Characterist Fruits &

    Vegetables Maoming 525000 Guangdong Peoples R China;

    Guangdong Univ Petrochem Technol Coll Environm &

    Biol Engn Maoming 525000 Guangdong Peoples R China;

    Guangdong Univ Petrochem Technol Food Sci Innovat Team Guangdong Higher Educ Inst Technol Lingnan Characterist Fruits &

    Vegetables Maoming 525000 Guangdong Peoples R China;

    Guangdong Univ Petrochem Technol Coll Environm &

    Biol Engn Maoming 525000 Guangdong Peoples R China;

    Guangdong Univ Petrochem Technol Coll Environm &

    Biol Engn Maoming 525000 Guangdong Peoples R China;

    Guangdong Univ Petrochem Technol Food Sci Innovat Team Guangdong Higher Educ Inst Technol Lingnan Characterist Fruits &

    Vegetables Maoming 525000 Guangdong Peoples R China;

    Guangdong Univ Petrochem Technol Food Sci Innovat Team Guangdong Higher Educ Inst Technol Lingnan Characterist Fruits &

    Vegetables Maoming 525000 Guangdong Peoples R China;

    Guangdong Univ Petrochem Technol Coll Environm &

    Biol Engn Maoming 525000 Guangdong Peoples R China;

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