Adsorption of acid red and acid orange with adsorbent from bioethanol black liquor sludge (original) (raw)
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Utilization of industrial waste products as adsorbents for the removal of dyes
Journal of Hazardous Materials, 2003
A number of low cost adsorbents from steel and fertilizer industries wastes have been prepared and investigated for the removal of anionic dyes such as ethyl orange, metanil yellow and acid blue 113 from aqueous solutions. The results indicate that inorganic wastes, i.e. blast furnace dust, sludge and slag from steel plants are not suitable for the removal of organic materials, whereas a carbonaceous adsorbent prepared from carbon slurry of fertilizer industry was found to adsorb 198, 211 and 219 mg/g of ethyl orange, metanil yellow and acid blue 113, respectively. The adsorption of dyes on this adsorbent was studied as a function of contact time, concentration, particle size and temperature by batch method. The adsorption isotherm conformed to Langmuir model and the adsorption was found to be exothermic and physical in nature. Kinetic data conforms to Lagergren’s equation with good correlation coefficients varying from 0.9998 to 0.9999 indicating that the adsorption is a first-order process. The adsorption data on carbonaceous adsorbent was compared to a standard activated charcoal sample and it was found that the prepared adsorbent is about 80% as efficient as standard activated charcoal and therefore, can be used as low cost alternative (∼US$ 100 per ton) for colour removal from effluents.
A review on adsorbent parameters for removal of dye products from industrial wastewater
IWA, 2021
Industrial effluents are usually one of the major industries polluting the environment and surface water. It is estimated that the worldwide production of dyes is about 70 tons/year. To overcome this problem, innovative processes are suggested for the treatment of industrial effluents containing dyes and heavy metals. The goal of the processes is often to reduce the toxicity of these pollutants in order to meet treatment standards. Recently, great attention has been paid to innovative processes for physical and chemical removal techniques such as adsorption on new adsorbents, biomass adsorption, membrane filtration, irradiation, and electrochemical coagulation. In this study, the application of adsorbents in the adsorption process to remove dye pollutants from industrial effluents has been studied. Factors affecting dye adsorption such as pH, temperature, initial dye concentration, and adsorbent amount are also presented. The obtained results revealed that more than 80% of the dye adsorption on the surface of adsorbents are endothermic processes and more than 95% of the processes obey the pseudo-second-order kinetic model.
Study of Effect of Concentration on Adsorption of Methyl Red Dye using different Adsorbents
International Journal for Research in Applied Science and Engineering Technology, 2017
Textile processing industries are now widespread sectors in many developing countries. Among the various processes in the textile industry, dyeing process uses large volume of water for dyeing, fixing and washing processes. Thus, the wastewater generated from the textile processing industries contains suspended solids, high amount of dissolved solids, un-reacted dyestuffs (colour) and other auxiliary chemicals that are used in the various stages of dyeing and processing. The conventional method of textile wastewater treatment consists of chemical coagulation, biological treatment followed by activated carbon adsorption. However, wastewater containing dyes is very difficult and complex to treat, since the dyes are recalcitrant organic molecules, resistant to aerobic digestion, and are stable to light, heat and oxidizing agents due to their molecular structure and size. Adsorption techniques have gained popularity in recent years because of their proven efficiency in the removal of po...
REVIEW PAPER ON REMOVAL OF A DYE FROM AQUEOUS SOLUTION BY ADSORPTION
To investigate the adsorption capacities of locally available low cost bio-adsorbents like neem leaves, orange peels, peanut hulls and coconut coir pith powders to remove colour in a textile industry wastewater, experiments were performed. The experiments were conducted at pH of 7 with different process parameters like adsorbent dosage, temperature, contact time and agitator speed using batch adsorption method. From the experimental results, the maximum colour from the textile industry wastewater was obtained at an optimum adsorbent dosage of 350 mg, an optimum contact time of 73 min., an optimum temperature of 330 K and an optimum agitator speed of 650 rpm. Further, from the validation experiments, it was found that the maximum colour removal percentage in textile industry wastewater is about 75.2%, 78.3%, 86.6% and 81.7 % respectively for neem leaves, orange peels, peanut hulls and coconut coir pith powders. This result was higher than the results obtained by different process parameters for various bio-adsorbents. Finally, from the results of adsorption study, it was concluded that bio-adsorbents used as a coagulant for removing the colour from textile industry wastewater especially peanut hulls powder because of its higher adsorptive capacity than other bio-adsorbents used in this study.
A Comparitive Study of Adsorption Behaviour of a Dye Using Agro Wastes as Adsorbents
The use of cheap and eco-friendly adsorbents are studied as an alternative substitution of activated carbon for the removal of dyes from wastewater. Laboratory investigations were done to find the potential of Rice husk ash(RHA), Activated Rice Husk (ARH) and Azadirecta indica leaves (Neem) powder (NLP )to remove methylene blue dye from aqueous solution . ARH was prepared from rice husk treated with nitric acid and RHA Prepared by heating in muff furnace at 300 0 C. Neem leaves are sundried for few days and then dried at low temperature (<105°C) for 24 hrs in hot air oven to remove moisture content. The effects of various experimental parameters, such as pH , adsorbent dosage and contact time were investigated. Langmuir adsorption isotherm was applied and R 2 value was calculated which shows, Langmuir adsorption is a good fit for the experimental data. The result shows that the 85 % colour removal efficiency can be achieved at the dose of 50 g/l of ARH . 90 % colour removal efficiency is achieved at the adsorbent dose of 40 g/l of RHA. With increase in RHA dose the efficiency increased upto 96 %. 81% of colour removal efficiency is achieved with NLP .
The Change from Past to Future for Adsorbent Materials in Treatment of Dyeing Wastewaters
Materials, 2013
Adsorption is one of the most promising decolorization techniques in dyeing wastewater treatment. Adsorption techniques for wastewater treatment have become more popular in recent years owing to their efficiency in the removal of pollutants too stable for biological methods. Dye adsorption is a result of two mechanisms (adsorption and ion exchange) and is influenced by many factors as dye/adsorbent interaction, adsorbent's surface area, particle size, temperature, pH, and contact time. The main advantage of adsorption recently became the use of low-cost materials, which reduces the procedure cost. The present review firstly introduced the technology process, research history and research hotspot of adsorption. Then, the application of adsorption in treatment of dyeing wastewaters in the past decades was summarized, revealing the impressive changes in modes, trends, and conditions. From this review article, the different philosophy of synthesis of adsorbent materials became evident.
Colour Removal from Synthetic Dye Wastewater Using a Bioadsorbent
Water Air and Soil Pollution, 2000
Removal of dyes (Crystal Violet, Methylene Blue, Malachite Greenand Rhodamine B) from aqueous solutions at differentconcentrations, pH and temperatures by Neem sawdust has beencarried out successfully. The percentage of the dye adsorbed byNeem sawdust decreased from 91.56 to 78.94 and 84.93 to 71.25 for Crystal Violet and Malachite Green, respectively, when the concentration of the dye was increased from 6 to 12 mg L-1 at atemperature 30 ± 1 °C and pH 7.2. Adsorption ofother dyes (Methylene Blue and Rhodamine B) also decreased withincreasing concentration of the dye in solutions. The values ofthe rate constant of adsorption (k ad) of Crystal Violet at25, 35 and 45 °C were found to be 10.80, 10.52 and 10.25 × 10-2 min-1, respectively. The values of the Langmuir constant for adsorption capacity (Q o) of Crystal Violet on the adsorbent varied from 4.44 to3.99 mg g-1, respectively, with the increase of temperaturebetween 25 to 45 °C. The equilibrium data followed theLangmuir model of adsorption. The variation in the extent ofremoval with pH has been explained on the basis of surfaceionisation and complexation. Thermodynamic parameters(ΔG, ΔH and ΔS) have also been determinedto explain the results.
Removal of Dyes from Wastewater using Adsorption -A Review
The adsorption process is being extensively used for the removal of dyes from synthetic dyehouse effluents by various researchers. The most widely used adsorbent is commercially available activated carbon. Despite the frequent use of adsorption in wastewater treatment systems, commercially available activated carbon remains an expensive material. In recent years, the safe and economical methods are required for the treatment of dyehouse effluents, which involved researchers to focus towards the preparation of low cost adsorbents from cheapest sources. Therefore, in this review article, the different cheapest sources of preparing adsorbent are discussed and their feasibility in treating dyehouse effluents is studied. INTRODUCTION Dyeing industry is one of the largest water consuming industries. The effluent coming out of the dyeing industries contains various chemicals and colouring compounds and the effluent requires proper treatment before it is discharged into any water body. But,...
Journal of Colloid and Interface Science, 2005
The use of low-cost and ecofriendly adsorbents has been investigated as an ideal alternative to the current expensive methods of removing dyes from wastewater. Orange peel was collected from the fields of orange trees in the north of Iran and converted into a low-cost adsorbent. This paper deals with the removal of textile dyes from aqueous solutions by orange peel. Direct Red 23 (DR23) and Direct Red 80 (DR80) were used as model compounds. The adsorption capacity Q 0 was 10.72 and 21.05 mg/g at initial pH 2. The effects of initial dye concentration (50, 75, 100, 125 mg/l), pH, mixing rate, contact time, and quantity of orange peel have been studied at 25 • C. The Langmuir and Freundlich models were used for this study. It was found that the experimental results show that the Langmuir equation fit better than the Freundlich equation. The results indicate that acidic pH supported the adsorption of both dyes on the adsorbent. Orange peel with concentrations of 8 and 4 g/l has shown adsorption efficiencies of about 92 and 91% for DR23 and DR80, respectively. Furthermore, adsorption kinetics of both dyes was studied and the rates of sorption were found to conform to pseudo-second-order kinetics with a good correlation (R 0.998). Maximum desorption of 97.7% for DR23 and 93% for DR80 were achieved in aqueous solution at pH 2. Finally, the effect of adsorbent surface was analyzed by scanning electron microscope (SEM). SEM images showed reasonable agreement with adsorption measurements. 2005 Published by Elsevier Inc.