Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies
- 1 July 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Environmental Science and Pollution Research
- Vol. 27 (21), 27048-27060
- https://doi.org/10.1007/s11356-020-09053-z
Abstract
The palm (Elaeis guineensis), known as dende, is an important oleaginous Brazilian plant with a high performance of oil production. In this work, a 2(3) full experimental design was performed and the response surface method (RSM) was used to indicate the optimum parameter of caffeine adsorption on Elaeis guineensis endocarp activated carbon, since the endocarp is the main by-product from dende oil production. It was set the adsorbent point of zero charge (pH(pzc)), and the material was characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The RSM results indicate removal efficiency (%) at the optimal conditions, 0.20 g of adsorbent, and caffeine initial concentration of 20 mg/L, and acidic medium was about 95%. Based on ANOVA and F test (F-calculated > F-standard), the mathematical/statistical model obtained fits well to the experimental data. The overall kinetic studies showed time was achieved after 5 h and caffeine adsorption followed the pseudo-second-order model suggesting chemisorption is a predominant mechanism. Redlich-Peterson and Sips models best represented the experimental data (0.967 < R-2 < 0.993). Thermodynamic revealed that caffeine adsorption was spontaneous at all temperatures studied, exothermic, and probably with changes in the adsorbate-adsorbent complex during the process. The tests conducted in different water matrixes corroborate the suitability of this adsorbent to be used in caffeine removal even in a complex solution.Keywords
Funding Information
- Fundação de Amparo à Pesquisa do Estado de Alagoas
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
This publication has 67 references indexed in Scilit:
- Oxidized biochar obtained from pine needles as a novel adsorbent to remove caffeine from aqueous solutionsJournal of Molecular Liquids, 2020
- Low-cost adsorbent derived from the coconut shell for the removal of hexavalent chromium from aqueous mediumMaterials Today, 2020
- Τhe application of oxidized carbon derived from Luffa cylindrica for caffeine removal. Equilibrium, thermodynamic, kinetic and mechanistic analysisJournal of Molecular Liquids, 2019
- Production of activated carbon from African star apple seed husks, oil seed and whole seed for wastewater treatmentJournal of Cleaner Production, 2019
- Process Optimization Study of Zn2+ Adsorption on Biochar-Alginate Composite Adsorbent by Response Surface Methodology (RSM)Water, 2019
- Adsorption of caffeine on mesoporous activated carbon fibers prepared from pineapple plant leavesEcotoxicology and Environmental Safety, 2018
- Influence of the natural organic matter in the removal of caffeine from water by fixed-bed column adsorptionInternational Journal of Environmental Science and Technology, 2016
- Optimization and modelling using the response surface methodology (RSM) for ciprofloxacin removal by electrocoagulationWater Science & Technology, 2015
- Synthesis of carbon xerogels and their application in adsorption studies of caffeine and diclofenac as emerging contaminantsChemical Engineering Research and Design, 2015
- Effect of solution pH and influence of water hardness on caffeine adsorption onto activated carbonsThe Canadian Journal of Chemical Engineering, 2014