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Kinetics equilibrium and thermodynamics investigation on the adsorption of lead(II) by coal-based activated carbon

機譯：煤基活性炭吸附鉛（II）的動力學平衡和熱力學研究

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The goal of this research is to investigate the feasibility of using activated coal-based activated carbon (CBAC) to adsorb Pb(II) from aqueous solutions through batch tests. Effects of contact time, pH, temperature and initial Pb(II) concentration on the Pb(II) adsorption were examined. The Pb(II) adsorption is strongly dependent on pH, but insensitive to temperature. The best pH for Pb(II) removal is in the range of 5.0–5.5 with more than 90 % of Pb(II) removed. The equilibrium time was found to be 60 min and the adsorption data followed the pseudo-second-order kinetics. Isotherm data followed Langmuir isotherm model with a maximum adsorption capacity of 162.33 mg/g. The adsorption was exothermic and spontaneous in nature. The Fourier transform infrared spectroscopy and scanning electron microscopy analysis suggested that CBAC possessed a porous structure and was rich in carboxyl and hydroxyl groups on its surface, which might play a major role in Pb(II) adsorption. These findings indicated that CBAC has great potential as an alternative adsorbent for Pb(II) removal.
機譯：這項研究的目的是通過分批測試來研究使用活性炭基活性炭（CBAC）從水溶液中吸附Pb（II）的可行性。研究了接觸時間，pH，溫度和初始Pb（II）濃度對Pb（II）吸附的影響。 Pb（II）的吸附強烈依賴于pH值，但對溫度不敏感。去除Pb（II）的最佳pH在5.0-5.5范圍內，去除Pb（II）的90％以上。平衡時間為60分鐘，吸附數(shù)據(jù)遵循擬二級動力學。等溫線數(shù)據(jù)遵循Langmuir等溫線模型，最大吸附容量為162.33 mg / g。吸附是放熱的，自然而然的。傅里葉變換紅外光譜和掃描電子顯微鏡分析表明，CBAC具有多孔結構，其表面富含羧基和羥基，這可能在Pb（II）吸附中起主要作用。這些發(fā)現(xiàn)表明，CBAC作為去除Pb（II）的替代吸附劑具有巨大潛力。

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