Low-cost adsorbent derived from the coconut shell for the removal of hexavalent chromium from aqueous medium

Chandana, L.; Krushnamurty, K.; Suryakala, Duvvuri; Subrahmanyam, Ch.

doi:10.1016/j.matpr.2019.04.205

Cited by 22 publications

(16 citation statements)

References 27 publications

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“…Activated carbons are among the most used materials as adsorbent. Recently, several researches have been conducted to obtain new activated carbons from renewable sources, such as agroindustry by-products (Suzuki et al 2007;Beltrame et al 2018), papaya seeds (Weber et al 2013), Syagrus oleracea endocarp (dos Santos et al 2019a), Wodyetia bifurcata endocarp (dos Santos et al 2019b), coconut shells (Chandana et al 2019), rice husks (Lv et al 2020), wood sawmills (Ramirez et al 2020), and apple seed shells (Abatan et al 2019). The palm (Elaeis guineensis), known as dendê, is a typical Brazilian palm tree that is the higher oil producer per unit of cultivated area among other oleaginous plants in Brazil, an average of 4-6 t of oil/ha-year (Queiroz et al 2012) (De Azevedo et al 2014.…”

Section: Introductionmentioning

confidence: 99%

Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies

Melo

Ide

Duarte

et al. 2020

Environ Sci Pollut Res

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The palm (Elaeis guineensis), known as dendê, 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 dendê 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.

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Section: Introductionmentioning

confidence: 99%

Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies

Melo

Ide

Duarte

et al. 2020

Environ Sci Pollut Res

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“…In addition, the effect of electrolyte solution (KNO3) on the sorption uptake of Cu(II) was also investigated. It was concluded that the sorption of Cu 2+ onto activated carbon decreased by the presence of electrolyte and could be potentially explained by the presence of K + ions which competes with the Cu 2+ for the surface active sites.Dried coconut shell was converted into low cost adsorbent via physical activation and applied towards the removal of Cr(VI) from aqueous solution [79]. Herein, the effect of solution pH(2, 4) showed greater removal efficiency (94%, 86%) for uptake of metal ion on the activated carbon matrix which may attribute to the predominance of HCrO4with relatively smaller size in acidic solution (pH < 4.0) as compared to Cr4O13 2− , Cr3O10 2− , Cr2O7 2− and CrO4 2−-.…”

Section: Heavy Metalsmentioning

confidence: 99%

Application of the Principal Component Analysis (PCA) to aerobic biodegradation process

Raffa

Vergnano

Chiampo

et al. 2021

International Journal of Chemical and Environmental Sciences

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“…Several low-cost adsorbents have been used to remove pollutant ions from wastewater; these include nonliving biomass, waste biomass, algal biomass, or microbial biomass [17]. Also, activated carbon, nanoporous activated carbon, biochar, and chemically modified biochar prepared from aloe vera waste [18], garlic stem [19], and coconut shell [20] were also used for adsorption of pollutant species from wastewater. For reducing the Cr(VI) ion concentration from the aqueous solution, adsorbents such as waste tea [21], raw straw [22], rice husk [23], orange peel [24], walnut shell [25], Ziziphus jujuba cores as waste lignocellulosic material [26], and eggshell membranes of different birds [27] had been investigated.…”

Section: Introductionmentioning

confidence: 99%

Adsorption-Desorption Surface Bindings, Kinetics, and Mass Transfer Behavior of Thermally and Chemically Treated Great Millet Husk towards Cr(VI) Removal from Synthetic Wastewater

Prajapati

Verma

Singh

et al. 2022

Adsorption Science & Technology

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This study reports the efficacy of adsorbents synthesized by thermal (TT-GMH) and chemical (CT-GMH) modification of great millet husk (GMH) for the treatment of synthetic wastewater containing Cr(VI). The chemical modification of raw GMH was done by concentrated H2SO4 to increase the porosity and heterogeneity on the surface. The comparative investigations of physicochemical properties of synthesized adsorbents were examined by point of zero charge (pHpzc), BET surface area, SEM-EDX, FTIR, and XRD analyses. The results revealed that CT-GMH had around three times higher surface area and more porous structure as compared to TT-GMH. The adsorption experiments were executed in batch mode to examine the impact of parameters governing the adsorption process. For Cr(VI) solution of 25 mg/L, adsorbent dose of 4 g/L, temperature of 25 ° C , and shaking speed of 150 RPM, the maximum removal for TT-GMH was attained at pH 1 and contact time 150 min, while for CT-GMH, maximum removal was attained at pH 2 and contact time 120 min. The experimental results fitted to the rate kinetic equations showed that for both TT-GMH and CT-GMH, adsorbents followed the quasi-second-order kinetic model during the adsorption process. Further, results revealed that the adsorption process was endothermic and Sips isotherm model was followed for both TT-GMH and CT-GMH. Based on the Sips isotherm, maximum uptake capacity for TT-GMH and CT-GMH was noted to be 16 and 22.21 mg/g, respectively. Among the tested mass transfer models, liquid film diffusion model was followed during the adsorption process of both the adsorbents. The desorption study revealed that TT-GMH and CT-GMH give 69.45% and 74.48% removal, respectively, up to six cycles.

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Low-cost adsorbent derived from the coconut shell for the removal of hexavalent chromium from aqueous medium

Cited by 22 publications

References 27 publications

Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies

Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies

Application of the Principal Component Analysis (PCA) to aerobic biodegradation process

Adsorption-Desorption Surface Bindings, Kinetics, and Mass Transfer Behavior of Thermally and Chemically Treated Great Millet Husk towards Cr(VI) Removal from Synthetic Wastewater

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