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Effective carbonaceous desiccated coconut waste adsorbent for application of heavy metal uptakes by adsorption: Equilibrium, kinetic and thermodynamics analysis
Biomass & Bioenergy ( IF 5.8 ) Pub Date : 2020-10-12 , DOI: 10.1016/j.biombioe.2020.105805
Abdul Rahman Abdul Rahim , Hanan M. Mohsin , Murugesan Thanabalan , Nurul Ekmi Rabat , Norasikin Saman , Hanapi Mat , Khairiraihanna Johari

The char desiccated coconut adsorbent (DCWC) is prepared through a facile carbonization method in an open-air muffle furnace. The characterization analyses of the adsorbents show that the carbonized adsorbent has more significant pore structure, higher surface area and higher composition of elemental carbon all while retaining the same functional group as the pristine adsorbent. Among the carbonized adsorbent, surface area of DCWC500 is 134.640 m2/g, the highest among the carbonized adsorbent i.e. DCWC400 and DCWC300. The carbonization of the desiccated coconut waste materials resulted in higher adsorption capacity of the adsorbent where the recorded maximum monolayer capacity was 2.65 and 3.51 mmol/g for DCWP and DCWC500, respectively. The adsorptive uptake of Pb(II) by the adsorbents follows Langmuir isotherm and pseudo-second order kinetic model which indicates the process follows favourable monolayer adsorption process governed by chemical adsorption. Both DCWP and DCWC500 adsorbents are regenerable up to five (5) adsorption-desorption cycles of Pb(II) with the ability to retain Pb(II) removal above 85%. In respect to its application for Pb(II) removal in wastewater, both DCWP and DCWC performed a highly effective Pb(II) removal which indicate that the adsorbents are potential as an efficient and cost-friendly adsorbent alternatives for industrial application.



中文翻译:

有效的碳质干燥椰子废料吸附剂,用于通过吸附法吸收重金属:平衡,动力学和热力学分析

炭化的椰子吸附剂(DCWC)是通过露天马弗炉中的易碳化方法制备的。吸附剂的特征分析表明,碳化吸附剂具有更显着的孔结构,更高的表面积和更高的元素碳组成,同时保留了与原始吸附剂相同的官能团。在碳化吸附剂中,DCWC500的表面积为134.640 m 2/ g,在碳化吸附剂中最高,即DCWC400和DCWC300。干燥的椰子废料的碳化导致吸附剂的更高吸附容量,其中记录的最大单层容量分别为DCWP和DCWC500,分别为2.65和3.51 mmol / g。吸附剂对Pb(II)的吸附吸收遵循Langmuir等温线和拟二级动力学模型,这表明该过程遵循化学吸附控制的有利单层吸附过程。DCWP和DCWC500吸附剂均可再生多达五(5)个Pb(II)吸附-解吸循环,并且能够将Pb(II)的去除率保持在85%以上。关于其在废水中去除Pb(II)的应用,

更新日期:2020-10-12
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