Sorption Studies of Methylene Blue Using Activated Carbon Produced from Rice Husk (original) (raw)
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The feasibility of using an activated carbon prepared from teak leaf litter and cocoa pod husks (MPAC) to remove methylene blue (MB) from aqueous solution was investigated. The effects of contact time, MPAC dosage, initial concentration, pH and temperature of MB solution were investigated through adsorption equilibrium, isotherm, kinetic and thermodynamic studies. Optimum adsorption of MB from solution occurred at pH 8 and low adsorbent dosages. The physical adsorption process was endothermic and best described by Langmuir isotherm, pseudo-second order kinetic models and liquid film diffusion mechanism. MPAC is a promising adsorbent for removing MB from aqueous solution.
Dyes and pigments, 2001
The kinetics and mechanism of methylene blue adsorption on commercial activated carbon (CAC) and indigenously prepared activated carbons from bamboo dust, coconut shell, groundnut shell, rice husk, and straw, have been studied. The effects of various experimental parameters have been investigated using a batch adsorption technique to obtain information on treating effluents from the dye industry. The extent of dye removal increased with decrease in the initial concentration of the dye and particle size of the adsorbent and also increased with increase in contact time, amount of adsorbent used and the initial pH of the solution. Adsorption data were modeled using the Freundlich and Langmuir adsorption isotherms and first order kinetic equations. The kinetics of adsorption were found to be first order with regard to intra-particle diffusion rate. The adsorption capacities of indigenous activated carbons have been compared with that of the commercial activated carbon. The results indicate that such carbons could be employed as low cost alternatives to commercial activated carbon in wastewater treatment for the removal of colour and dyes. #
Removal of Methylene Blue Dye from Textile Wastewater using Activated Carbon Prepared from Rice Husk
International Journal of Innovation and Scientific Research, 2014
Textile industry is one of those industries that consume large amounts of water during the manufacturing process and, also, discharge great amounts of effluents with synthetic dyes to the environment causing public concern. Azo dyes are applied in textile industries, are considered to be serious health-risk factors. Several physico-chemical and biological methods for dye removal from wastewater have been investigated in the last decades. But, these treatment techniques need posterior separation process which significantly affects the economic performance of the plant. On the other hand, adsorption is one of the efficient methods and needs low capital and operational costs. Thus, this study investigates the potential use of low cost activated carbon prepared from the rice husk for the removal of Methylene Blue wastes. The rice husk was collected form rice mill and washed repeatedly until the dirty was eliminated. Then, it was heated at 500 o C for 30 min and the activated carbon had been activated with H 2 SO 4 in order to make the carbon porous. A batch experiments were carried out in order to investigate the effect of various parameters. Uv-visibile spectrometer was used for the analysis of final concentration of the effluent. Experimental results have shown that, the amount of dye adsorption increased with decreasing the initial concentration, adsorbent dosage, contact time and temperature. Over 99% removal efficiency were achieved for the given dosage. With respect pH, pH value of 8-10 was found to be the optimal value.
M.M.Elhalwany, 2010
Adsorption of Methylene Blue (MB) from aqueous solutions on activated carbon prepared from Egyptian rice hulls (ERHA) is studied experimentally. Results obtained indicate that the removal efficiency of Methylene Blue at 25 °C exceeds 99% and that the adsorption process is highly pH-dependent. Results showed that the optimum pH lies between 5 and 9. The amount of Methylene Blue adsorbed form aqueous solution increases with the increase of the initial Methylene Blue concentration and temperature. Smaller adsorbent particle adds to increase the percentage removal of Methylene Blue. The results fit the BET model for adsorption of MB on ERHA, corroborating the assumption of that the adsorbate molecules could be adsorbed in more than one layer thick on the surface of the adsorbent. A comparison of kinetic models at different conditions (pH, Temperature, adsorbent particle size, adsorbent dose and adsorbate concentration) applied to the adsorption of Methylene Blue on the adsorbent was evaluated for the pseudo first-order, the pseudo second-order, Elovich and intraparticle diffusion kinetic models, respectively. Results showed that the pseudo second-order kinetic model correlate the experimental data well.
2005
Activated carbons were prepared from coconut~hell, coirPith and rice husk using I M ferric chloride, I M Trioxonitrate (V) acid, I M orthophosphoric acid and I "potassium carbonate as the chemical activating reagents. The prepared activated carbons were characterized using micropore volume, bulk density. moisture content and pH. The activated carbons prepared were used for the adsorption of blue-dye of concentration ranging from 100 to 2000 mg/I from aqueous solution. The results obtained indicated that ferric chloride-activated carbons produced from coconut coirpith are better adsorbents for blue-dye than those prepared from rice husk. The adsorption data fit well with Freundlich adsorption isotherm. The adsorption capacity calculated from the Freundlich isotherm was in the range of 0.0109 and 25.6448 mg/g at 28 ± 2°C at pH 8.0 and for particle size 0.08-0.5 mm.
2013
In this study, the rice husk (RH) and rice husk ash (RHA) were used as a low cost adsorbent to remove methylene blue (MB) from aqueous solution by batch sorption technique. Effects of initial dye concentration, solution pH, and adsorbent dose on sorption were studied. It was shown that the percent removal also increased when the adsorption capacity (qe) were increased. In the batch system, the adsorption capacity was increased when the parameters were increased until it achieved the equilibrium. The Langmuir and Freundlich’s models were applied to the data related to adsorption isotherm. The optimal parameters for this experiment were 7.5ppm for initial concentration, 0.6g adsorbent dosage and pH 5.8. In the batch system, the adsorption capacity was increased when the parameters were increased until it achieved the equilibrium. The RHA could be employed as the more effective low cost adsorbent for removal of Methylene Blue Dye from aqueous solution.
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.
Journal of Colloid and Interface Science, 2005
Batch experiments were carried out for the sorption of methylene blue onto rice husk particles. The operating variables studied were initial solution pH, initial dye concentration, adsorbent concentration, and contact time. Equilibrium data were fitted to the Freundlich and Langmuir isotherm equations and the equilibrium data were found to be well represented by the Langmuir isotherm equation. The monolayer sorption capacity of rice husks for methylene blue sorption was found to be 40.5833 mg/g at room temperature (32 • C). The sorption was analyzed using pseudo-first-order and pseudo-second-order kinetic models and the sorption kinetics was found to follow a pseudo-second-order kinetic model. Also the applicability of pseudo second order in modeling the kinetic data was also discussed. The sorption process was found to be controlled by both surface and pore diffusion with surface diffusion at the earlier stages followed by pore diffusion at the later stages. The average external mass transfer coefficient and intraparticle diffusion coefficient was found to be 0.01133 min −1 and 0.695358 mg/g min 0.5 . Analysis of sorption data using a Boyd plot confirms that external mass transfer is the rate limiting step in the sorption process. The effective diffusion coefficient, D i was calculated using the Boyd constant and was found to be 5.05 × 10 −04 cm 2 /s for an initial dye concentration of 50 mg/L. A single-stage batch-adsorber design of the adsorption of methylene blue onto rice husk has been studied based on the Langmuir isotherm equation. (K.V. Kumar). from dye manufacturing and textile finishing industries. Currently the sorption technique is proved to be an effective and attractive process for the treatment of these dye-bearing wastewaters . Also this method will become inexpensive, if the sorbent material used is of cheaper cost and does not require any expensive additional pretreatment step. In the present study rice husks, an agro-based waste material have been used as adsorbent for the removal of methylene blue from its aqueous solution. Methylene blue is selected as a model compound in order to evaluate the capacity of rice husk for the removal of dye (methylene blue) from its aqueous solutions. Methylene blue has wider applications, which include coloring paper, temporary hair colorant, dyeing cottons, wools, and coating for paper stock. Though methylene blue is not strongly hazardous, it can cause some harmful effects. Acute exposure to methylene blue will cause increased heart rate, vomiting, shock, Heinz body formation, cyanosis,
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> ...
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