Valuation of banana peels as an effective biosorbent for mercury removal under low environmental concentrations (original) (raw)
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Kepok Banana Peels as Biosorbent for Mercury Sorption from Artificial Wastewater
JKPK (Jurnal Kimia dan Pendidikan Kimia)
The present study used adsorbents from Kepok banana peel to remove Hg (II) from artificial wastewater. Kepok banana peels are the most abundant waste from several products bananas processed. One of the ways to reduce that waste is by using it as an adsorbent. This study utilizes the adsorbent from kepok banana peels to remove Hg (II) from artificial wastewater. This is because Hg(II) is a heavy metal that is harmful A previous study showed a high amount of Hg(II) in Kuantan River, one of the River in Riau Province. The effect of initial metal concentration, adsorbent mass, and contact time was investigated to evaluate the maximum removal percentage and adsorption capacity of Kepok banana peels. The adsorption parameters studied were initial Hg (II) concentration [6.84, 7.02,8.38, and 10.05 mg/L], adsorbent mass [10,20,30 and 40 g], and contact time variations (3,5,7 and 9 hours) where the operating conditions were 250 ml of Hg metal solution was added to each adsorbent. FTIR spectr...
Low cost biosorbent banana peel (Musa sapientum) for the removal of heavy metals
Scientific Research …, 2011
The efficacy of the banana peel (Musa sapientum) biomass was tested for the removal of lead, copper, zinc and nickel metal ions using batch experiments in single and binary metal solution under controlled experimental conditions. It is found that metal sorption increases when the equilibrium metal concentration rises. At highest experimental solution concentration used (150 mg/L), the removal of metal ions were 92.52% for lead, 79.55% for copper, 63.23% for zinc and 68.10% for nickel while at lowest experimental solution concentration (25 mg/L), the removal of metal ions were 94.80% for lead, 86.81% for copper, 84.63% for zinc and 82.36% for nickel. Biosorption equilibrium isotherms were plotted for metal uptake capacity (q) against residual metal concentrations (C f ) in solution. The q versus C f sorption isotherm relationship was mathematically expressed by Langmuir and Freundlich models. The values of separation factor were between zero and one indicating favourable sorption for four tested metals on the biosorbent. The surface coverage values were approaching unity with increasing solution concentration indicating effectiveness of biosorbent under investigation. The non-living biomass of M. sapientum present comparable biosorption capacity for lead, copper, zinc and nickel metal ions with other types of biosorbent materials found in literature and is effective to remove metal ions from single metal solutions as well as in the presence of other co-ions with the main metal of solution.
Recovery of grape waste for the preparation of adsorbents for water treatment: Mercury removal
Journal of Environmental Chemical Engineering, 2020
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Water, Air, & Soil Pollution
globulus bark, water hyacinth, and coffee waste) were tested and compared under the same batch conditions with an initial mercury concentration of 50 µg dm −3 in order to determine their removal performances. Several reaction-and diffusion-based models were adjusted to the experimental data to analyze the limiting sorption mechanisms. Sorption experiments and modelling results evidenced distinct affinities of those biosorbents to Hg(II), banana peels being the best alternative due to the fast removal kinetics and capacity. This biosorbent was able to remove more than 90 % of the Hg(II) initially in solution after 72 h of exposure, being more than 80 % removed in the first 10 h. Chemical and physical characteristics of the solids are involved in Hg(II) elimination, as reported by FTIR-ATR and SEM studies.
Environmental Monitoring and Assessment, 2016
Mercury is a highly toxic substance that is a health hazard to humans. This study aims to investigate powders obtained from the peel of the fruit of Pachira aquatica Aubl, in its in natura and/or acidified form, as an adsorbent for the removal of mercury ions in aqueous solution. The materials were characterized by Fourier transform infrared spectroscopy and thermogravimetric analysis. The infrared spectra showed bands corresponding to the axial deformation of carbonyls from carboxylic acids, the most important functional group responsible for fixing the metal species to the adsorbent material. The thermograms displayed mass losses related to the decomposition of three major components, i.e., hemicellulose, cellulose, and lignin. The adsorption process was evaluated using cold-vapor atomic fluorescence spectrometry (CV AFS) and cold-vapor atomic absorption spectrometry (CV AAS). Three isotherm models were employed. The adsorption isotherm model, Langmuir-Freundlich, best represented the adsorption process, and the maximum adsorption capacity was predicted to be 0.71 and 0.58 mg g −1 at 25°C in nature and acidified, respectively. Adsorption efficiencies were further tested on real aqueous wastewater samples, and removal of Hg(II) was recorded as 69.6 % for biomass acidified and 76.3 % for biomass in nature. Results obtained from sorption experiments on real aqueous wastewater samples revealed that recovery of the target metal ions was very satisfactory. The pseudo-secondorder model showed the best correlation to the experimental data. The current findings showed that the investigated materials are potential adsorbents for mercury(II) ion removal in aqueous solution, with acidified P. aquatica Aubl being the most efficient adsorbent.
Author's personal copy Removal of mercury from aqueous solutions by malt spent rootlets
h i g h l i g h t s " Malt spent rootlets (MSR) are promising biosorbents for mercury removal. " Malt spent rootlets (MSR) exhibit satisfactory sorption capacity and fast kinetics. " Film diffusion and intra-particle diffusion play an important role on mercury sorption. a b s t r a c t Mercury poses a severe threat to environment due to its toxicity, even at low concentrations. Biosorption is a promising, low cost, and environmentally friendly clean up technique. Malt spent rootlets (MSR), a brewery by-product, were used as sorbents for the removal of mercury from aquatic systems. The effect of the solution pH, contact time between sorbent, solid to liquid ratio, and initial mercury concentration on mercury removal were investigated experimentally. It was found that the optimum pH for the mer-cury sorption onto MSR was approximately 5. Sorption kinetic experiments revealed that mercury sorp-tion is a relatively rapid process, where film diffusion and intra-particle di...
Banana Peel: A Green Solution for Metal Removal from Contaminated Waters
BACKGROUND: Certain crop-based waste materials have been recognized as cost-effective and highly efficient adsorbents for removal and recovery of different kind of heavy metals from aqueous solutions. The ability is strongly attributed to the carboxyl functional group of some pectin substances such as galacturonic acid often found in fruit peels. The present manuscript was aimed at assessing the potential applicability of banana peel for metal removal from contaminated waters. METHODS AND RESULTS: As revealed by laboratory investigations, banana peel contains pectin (10-21%), lignin (6-12%), cellulose (7.6-9.6%), and hemicelluloses (6.4-9.4%). The pectin extraction is reported to have glucose, galactose, arabinose, rhamnose, xylose, and galactouroninc acid. Several studies conducted under different conditions proved that banana peel is capable of adsorbing 5.71, 2.55, 28.00, 6.88, 7.97, and 5.80 mg/g of Cd2+, Co2+, Cu2+, Ni2+, Pb2+, and Zn2+, respectively, from aqueous solutions. Adsorption capacity is, however, dependent upon several factors including solution pH, dose of adsorbent and metal concentration, contact time and *교신저자(Corresponding author) Tel: +82-42-821-6733, Fax: +82-42-823-9241; Email: mhyoon@cnu.ac.kr shaking speed. CONCLUSION(S): Since the annual world production of banana exceeds 100 million tons, about 40 million tons of banana peel (40% of total weight of the fresh fruit) remains vastly unused. Exploring a sound technology with banana peel would therefore, not only address the much needed sustainable tool for cleaning contaminated waters, but of course bring an additional value to the banana industry worldwide. Key Words: Adsorbent, Aqueous solutions, Banana peel, Metal removal, Pectin substances
Green grape marc biosorbents preparation for mercury removal in aqueous media
Chemical Industry & Chemical Engineering Quarterly, 2023
Article Highlights • Grape marc-based biosorbents from wastes of Negroamaro wine production • The green approach was used in biosorbent preparation with water, ethanol, and citric acid • Biosorbent has a good adsorption capacity of Hg(II) ions in the water of 36.39 mg g-1 • A physical adsorption mechanism of Hg(II) on the biosorbent was observed • Biosorbent selectivity compared to Cu(II) and Ni(II) was proven