Removal of color material by activated carbon of some agricultural waste (original) (raw)
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Journal of Encapsulation and Adsorption Sciences
This paper investigated the analyses of removal of Methylene Blue (MB) and Brilliant Green (BG) dyes from aqueous solutions by adsorption on activated carbon prepared by chemical activation of coconut shell, eucalyptus tree, corn cob and flamboyant pod. It was found that the carbon pores increased after carbonization and activation processes. The maximum percentage MB removal was obtained as 95.0% for coconut shell, 93.2% for eucalyptus tree, 99.9% for corn cob, and 99.7% for flamboyant pod. Also, the maximum percentage BG removal was obtained as 97.0% for coconut shell, 98.2% for eucalyptus tree, 99.6% for corn cob, and 99.6% for flamboyant pod. The adsorption isotherms of the adsorption process were studied, and Freundlich model showed the best fit with the equilibrium data. To optimize the operating conditions, the effects of contact time, adsorbent dosage, and pH were investigated by two levels of factorial experimental design method and adsorbent dosage was found as the most significant factor.
Chemistry Journal of Moldova, 2024
Activated carbons have great applicability in the conditioning of wines: discoloration, removal of foreign taste and smell, correction of organoleptic parameters, etc. The purpose of this work was to compare the structural and sorption characteristics of local vegetal activated carbon obtained from apricot stones (AC-C, Republic of Moldova) with that of commercial activated carbons (Granucol® BI/GE/FA, Germany). The physico-chemical characteristics of studied activated carbons have been evaluated by standard methods (nitrogen sorption isotherms, IR spectroscopy, pH value of activated carbons suspension etc.) and the adsorption capacity by using methylene blue dye as a reference substance. Experimental data were analysed by theoretical models: Langmuir and Equilibrium isotherm models, and pseudo-first-order, and pseudo-second-order kinetic models. The adsorption capacity of the local activated carbon (AC-C, 690 mg/g) is higher by 30% than that of activated carbons from Granucol® series (approx. 535 mg/g).
Optimizing textile dye removal by activated carbon prepared from olive stones
Environmental Technology and Innovation, 2019
Activated carbon prepared from black and green olive stones were successfully used as an adsorbing agent to remove methylene blue from water. Scanning electron microscopy showed how the deep abundant cavities were occupied after adsorption. Fouriertransform infrared spectroscopy showed various functional groups on both adsorbents before and after adsorption. It was also noted that the highest N%, H% and C% prior to adsorption was found in black activated carbon olive stones. Furthermore, results showed that the maximum adsorption of methylene blue was at the optimum pH value of 10. The maximum adsorption capacity of methylene blue was 714 and 769 mg/g for black and green activated carbon olive stones, respectively. Methylene blue removal efficiency reached its maximum capacity at approximately 79%. The equilibrium data were best fitted by Freundlich isotherm reaching R 2 value of 98%. In addition, thermodynamic studies resulted in negative ∆G • value indicating that the adsorption process was spontaneous and feasible, negative ∆H • value confirming the exothermic reaction of the adsorption process, and positive ∆S • value for green activated carbon olive stones was higher than that for black activated carbon olive stones indicating the good affinity of methylene blue towards the adsorbent.
Asian Journal of Chemistry, 2013
The removal of dyes from waste effluents is considered as an environmental need because they can be visible and highly toxic even at very low concentration levels 1. Dyes contaminate environment from various industries, like textiles, paper, cosmetics, printing and foods. Dyes can destroy aquatic life because they prevent sunlight from reching water bottom totally. Also dyes may be mutagenic and/or carcinogenic to human 2. Usually, methylene blue is used for cotton and wood. Methylene blue can cause eye damage for human and animals. On inhalation, it may lead to short periods of rapid or difficult breathing; ingestion may cause nausea and methemoglobinemia 3. Many methods are used to remove colour from industrial effluents such as biological biodegradation 4 and adsorption 5. Many previous works studied the removal of methylene blue using different adsorbent such as coffee husks 6 , yellow passion fruit waste 7 , rice husks 8 , banana peel 9 , cereal chaff 10 , spent coffee grounds 11 , orange peel 9 , wheat shells 12 , durian peel 13 , etc. The application of untreated agricultural or plant waste as adsorbents, in addition to its low adsorption efficiency, may lead to additional organic load in the treated effluent in the form of chemical oxygen demand (COD), biological oxygen demand (BOD) and total organic carbon (TOC) due to release
Removal of Methylene Blue of Textile Industry Waste with Activated Carbon using Adsorption Method
Reaktor
The colorant that is often used in the textile industry is methylene blue which is a cationic heterocyclic aromatic compound. This compound is very stable and is difficult to decompose naturally leading to environment in large concentrations. Therefore, a waste treatment technology to reduce the concentration of dye waste in water becomes importannt. So far, adsorption method with activated carbon remains the most efficient and effective technique in removing dyes from liquid waste due to its relatively large adsorption capacity. Activated carbon is one of the non-metallic mineral commodities or multipurpose industrial minerals, one of which is as an adsorbent or adsorbent media. This study aims to determine the potential of activated carbon in adsorbing methylene blue with variations in the concentration of methylene blue and particle size of activated carbon. The procedures in this experiment include, the preparation of activated carbon with size variations (20-60, 60-100 and> ...
IOSR Journal of Agriculture and Veterinary Science, 2014
In the present study, activated carbons of Eichornea crasssipes(EC), Sugarcane bagassae(SB), Tea waste(TW) and Guava leaf(GL) were prepared from agricultural wastes and used as an adsorbents for the removal of Acid Blue 92 (AB92) dye from aqueous solution. The effects of pH, adsorbent dosage, initial dye concentration and contact time on the extent removal of AB92 has been studied by Batch adsorbtion method. The Langmuir and Freundlich isotherm models were applied for the present systems and the Langmuir model was applied to the equilibrium data better. The kinetic data followed the first-order kinetics determined from the Natarajan-Khalaf isotherm, Lagergren isotherm and Bhattacharya Venkobachar isotherm. The intraparticle diffusion was also measured to determine the porousities of the carbons and the boundary effect of the carbons on the adsorption of AB92. Effect of particle size of adsorbents and the thermodynamic parameters of adsorbents can also analysed. The desorption was also studied. From the data GUC has the more relative adsorption capacity and the ECC has the lesser among the above charcoal.
Industrial & Engineering Chemistry Research, 2003
An activated carbon was developed from coconut shell fibers, characterized and used for the removal of methylene blue (basic) and methyl orange (acidic) dyes from wastewater successfully. Adsorption studies were carried out at different temperatures, particle size, pH, and adsorbent doses. The adsorption data are correlated with both Langmuir and Freundlich models. The results indicate that the Freundlich model fits the data better as compared to the Langmuir model in terms of regression coefficients. Isotherms have been used to obtain the thermodynamic parameters such as free energy, enthalpy, and entropy of adsorption. The kinetic studies were also conducted, and the adsorption of methylene blue and methyl orange follow the first-order rate equation. Various kinetic parameters such as the mass-transfer coefficient, effective diffusion coefficient, activation energy, and entropy of activation were evaluated to establish the mechanisms. It was concluded that methylene blue adsorption occurs through a film diffusion mechanism at low as well as at higher concentrations, while methyl orange adsorption occurs through film diffusion at low concentration and particle diffusion at high concentrations. The sorption capacity of the developed carbon is comparable to the other available adsorbents, and costwise it is quite cheaper.
ChemSearch Journal, 2015
In the present study natural adsorbents Maize Cob (MC) and Mahogany Shells (MS) were carbonized and activated with steam/zinc chloride and sieved into 600μm particle sizes. The adsorbents were treated for the removal of colour from textile effluent at different time. These adsorbents were also evaluated at different adsorbent doses and effluent concentrations. It was found that Maize cob has the highest colour removal efficiency of 86% and also at shorter time of 25minutes compared to Mahogany shells which record 73% and at 30, respectively. Freundlich and Langmuir isotherm models were used for the mathematical description of colour adsorption equilibrium onto the adsorbents and the result obtained showed that the adsorption equilibrium data onto MC was closely fitted to the Langmuir model whereas the adsorption equilibrium data onto MS was closely fitted to the Freundlich model. Hence, adsorption of the colour onto the adsorbents is monolayer adsorption process. Keywords : Adsorpti...
Adsorptive removal of methylene blue dye from soapnut shell pineapple waste derived activated carbon
International Journal of Engineering, Science and Technology, 2021
The methylene blue (MB) adsorption from the aqueous solution on activated charcoal from soapnut shell & pineapple waste were studied in batch mode. The influence of a major parameter determining the efficiency of the process, such as the initial concentration, the adsorbent dose and the contact time on the removal process, was studied. Experimental studies have shown that the adsorption capacity of methylene blue increases with the increase of the adsorbent dose and decreases with the increase of the initial concentration. The equilibrium time of 120 min was observed. The considered optimal dose for removing methylene blue from aqueous solutions from soapnut shell & pineapple waste were 0.6 g & 1g respectively. The equilibrium data corresponds precisely to the Langmuir isotherm.
Korean Journal of Chemical …, 2011
Methylene blue dye was adsorbed on an adsorbent prepared from cashew nut shell. A batch adsorption study was carried out with variable adsorbent amount, initial dye concentration, contact time and pH. Studies showed that the pH of aqueous solutions affected dye removal as a result of removal efficiency increased with increasing solution pH. The experimental data were analyzed by the Langmuir, Freundlich, Redlich-Peterson, Koble-Corrigan, Toth, Temkin, Sips and Dubinin-Radushkevich models of adsorption using MATLAB 7.1. The experimental data yielded excellent fits within the following isotherm order: Redlich-Peterson>Toth>Sips>Koble-Corrigan>Langmuir>Temkin>Dubinin-Radushkevich>Freundlich, based on its correlation coefficient values. Three simplified kinetic models including a pseudofirst-order, pseudo-second-order and intraparticle diffusion equations were selected to follow the adsorption process. It was shown that the adsorption of methylene blue could be described by the pseudo-second-order equation. The results indicate that cashew nut shell activated carbon could be employed as a low cost alternative to commercial activated carbon in the removal of dyes from wastewater.