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首页> 外文期刊>American Journal of Chemical Engineering >Adsorption Studies of Oil Spill Clean-up Using Coconut Coir Activated Carbon (CCAC)
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Adsorption Studies of Oil Spill Clean-up Using Coconut Coir Activated Carbon (CCAC)

机译：椰子椰壳活性炭（CCAC）清除溢油的吸附研究

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The adsorption of crude oil from water by using Potassium hydroxide (KOH) prepared from coconut coir activated carbon CCAC_(KOH) was investigated by batch adsorption under varying parameters such as adsorbent dosage, contact time, initial oil concentration, temperature and agitation speed. The morphological modification significantly increased the hydrophobicity of the adsorbent, thus creating a CCAC with a much better adsorption capacity for crude oil removal having a maximum adsorption capacity of 4859.5 mg/g at 304 K as evidently proven by FTIR and SEM analysis. The experimental results showed that the percentage of crude oil removal increased with an increase in adsorbent dosage, contact time and decrease in initial oil concentration. The experimental isotherm data were analysed using Langmuir, Freundlich, Temkin, Toth, Sip and Redlich-Peterson isotherm equations and the best fitted isotherm model was Freundlich model with a high correlation coefficient (R~(2) = 0.999). The kinetic data were properly fitted into various kinetic models with Pseudo-second order model showing best fit having a correlation coefficient (R~(2) = 0.999) and Boyd model revealed that the adsorption was controlled by internal transport mechanism and film-diffusion was the major mode of adsorption. The crude oil adsorption was chemisorption and endothermic in nature (ΔH° = 134 KJ/mol.K) and the positive value of entropy (ΔS° = 0.517 KJ/mol.K) showed an increase in disorder and randomness at the adsorbent-adsorbate interface during the adsorption of crude oil from water. The decrease in Gibbs energy (ΔG°) with increasing temperature indicated an increase in the feasibility and spontaneity of the adsorption at higher temperatures. The prepared adsorbent showed significant capability to be used as a low-cost, re-generable and eco-friendly adsorbent in oil spill clean-up.
机译：采用了椰壳活性炭CCAC_（KOH）制得的氢氧化钾（KOH），通过在不同的吸附量，接触时间，初始油浓度，温度和搅拌速度等参数下进行间歇吸附研究了原油对水中的吸附。形态改性显着增加了吸附剂的疏水性，从而产生了一种具有更好的脱除原油吸附能力的CCAC，在304 K下的最大吸附能力为4859.5 mg / g，这已通过FTIR和SEM分析证明。实验结果表明，原油去除率随吸附剂量，接触时间和初始油浓度的降低而增加。用Langmuir，Freundlich，Temkin，Toth，Sip和Redlich-Peterson等温方程对实验等温线数据进行了分析，最佳拟合等温线模型是相关系数较高的Freundlich模型（R〜（2）= 0.999）。将动力学数据适当地拟合到各种动力学模型中，其中伪二阶模型显示具有最佳相关系数（R〜（2）= 0.999）的最佳拟合，Boyd模型表明吸附受内部传输机制控制且膜扩散是吸附的主要方式。原油吸附本质上是化学吸附和吸热（ΔH°= 134 KJ / mol.K），熵的正值（ΔS°= 0.517 KJ / mol.K）显示吸附剂-吸附物的无序性和无规性增加从水中吸附原油过程中的界面。吉布斯能量（ΔG°）随温度升高而降低，表明在较高温度下吸附的可行性和自发性增加。制备的吸附剂显示出显着的能力，可以用作溢油清理中的低成本，可再生和环保的吸附剂。

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