Coffee spent supported Fe-Al-Zr composite: Synthesis, characterization and its adsorptive dye removal from tannery wastewater (original) (raw)
Related papers
2018
This research was conducted to evaluate the adsorption performance of spent coffee ground modified Fe-Al-Zr nano-composite. The Al2O3/Fe3O4/ZrO2 ternary oxide system was efficiently synthesized from the respective salt precursors by a two-step coprecipitation method under nitrogen atmosphere in basic condition (pH=12). Scanning electron microscope (SEM), Energy dispersive X-ray (EDX) and X-ray diffraction (XRD), were used to characterize the features of the adsorbents. The pH point of zero charge of the selected adsorbent was also determined. Batch adsorption experiment was conducted under different conditions such as contact time, initial concentration of dye, pH, sorbent dosage and agitation speed. The Langmuir and Freundlich, isotherms were tested to examine the adsorption behavior. The equilibrium data was well fitted to Langmuir isotherm model. The maximum adsorption capacity (Qo) was 8.4 mg/g for acidic brown 75 dyes. The kinetic data correlated (R 2 =0.999) well with the pseu...
Journal of the Brazilian Chemical Society, 2015
New carbon composite materials were prepared by pyrolysis of mixture of coffee wastes and red mud at 700 o C with the inorganic : organic ratios of 1.9 (CC-1.9) and 2.2 (CC-2.2). These adsorbents were used to remove reactive orange 16 (RO-16) and reactive red 120 (RR-120) textile dyes from aqueous solution. The CC-1.9 and CC-2.2 materials were characterized using Fourier transform infrared spectroscopy, Nitrogen adsorption/desorption curves, scanning electron Microscopy and X-ray diffraction. The kinetic of adsorption data was fitted by general order kinetic model. A three-parameter isotherm model, Liu isotherm model, gave the best fit of the equilibrium data (298 to 323 K). The maximum amounts of dyes removed at 323 K were 144.8 (CC-1.9) and 139.5 mg g −1 (CC-2.2) for RO-16 dye and 95.76 (CC-1.9) and 93.80 mg g −1 (CC-2.2) for RR-120 dye. Two simulated dyehouse effluents were used to investigate the application of the adsorbents for effluent treatment.
A novel carbon composite was prepared by pyrolysis of mixture of coffee wastes and clay at 700°C with the inorganic : organic ratio of 1.3 (CC-1.3). Considering the application of this adsorbent for removal of anionic dyes, the CC-1.3 was treated with 6 mol L-1 HCl for 24 h to obtain ACC-1.3. FTIR, N2 adsorption/desorption curves, SEM and X-ray diffraction were used for characterisation of the CC-1.3 and ACC-1.3 carbon adsorbents. The adsorbents were effectively utilised for removal of reactive blue 19 (RB-19) and reactive violet 5 (RV-5) textile dyes from aqueous solutions. The maximum amounts of RB-19 dye adsorbed at 25°C were 63.59 (CC-1.3) and 110.6 mg g-1 (ACC- 1.3) and for RV-5 dye were 54.34 (CC-1.3) and 94.32 mg g-1 (ACC-1.3). Four simulated dyehouse effluents were used to test the application of the adsorbents for effluents treatment. Keywords: adsorption, industrial effluents, carbon composites, general order kinetic model, nonlinear isotherms.
Environmental Technology, 2019
Alumina-zirconia (Al 2 O 3-ZrO 2) composite was prepared by combustion method and used to remove Congo red and Methylene blue from aqueous solutions. It was characterized using SEM-EDS, XRD and gas adsorption techniques. The results obtained from gas adsorption and SEM agree with each other, showing meso-and macro-porosity of inter-agglomerate pores. The removal of the two dyes was pH dependent, acidic pH favoured Congo red removal, while basic pH favoured Methylene blue. The, mechanism of adsorption was not limited to electrostatic attraction between the adsorbent and the dye molecules. Adsorption kinetic of both dyes was consistent with Pseudo-second-order model. The data obtained fitted to Langmuir and Liu isotherm models, with the maximum adsorption capacity of 57. 50 and 53.44 mg g-1 for Congo red and Methylene blue, respectively. The thermodynamic parameters indicated that the adsorption is spontaneous and exothermic. The mechanism of adsorption was elucidated using XRD and FTIR techniques.
Fe-BIOCHAR COMPOSITE FOR THE REMOVAL OF DYE IN WASTEWATER USING ADSORPTION METHOD
IRJET, 2023
Use of various dyes in order to color the products is a common practice in textile industry. The presence of these dyes in water even at low concentrations is highly visible and undesirable. The biochar composite has become a hotspot as an adsorption material. It is an impurity adsorption material that shows promise and has prospective use in domains related to soil enhancement and sewage purification. This material can effectively remove the dye in wastewater. Using a spectrophotometer, kinetic studies and dye tests, the structural features and adsorption capabilities are studied. It was found that the biochar composite has a high specific surface area and pore volume. Compared to other adsorbents, this composite truly achieves the concept of "waste control by waste". Food waste derived biochar and Fe-Biochar composite are prepared by the pyrolysis process. The sequence of addition of ferric chloride differs for food waste derived biochar and Fe-biochar composites and the subsequent removal of Methyl orange dye and Congo red dye from wastewater.
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 .
Effective removal of anionic textile dyes using adsorbent synthesized from coffee waste
Scientific Reports, 2020
Adsorption of Reactive Black 5 and Congo Red from aqueous solution by coffee waste modified with polyethylenimine was investigated. The removal percentages of both dyes increased with amount of polyethyleneimine in the modified adsorbent. Characterization revealed that polyethyleneimine modification improved the adsorbent surface chemistry, while slight improvement of adsorbent textural properties was also observed. The adsorbent’s excellent performance was demonstrated by high removal percentages towards the anionic dyes in most experimental runs. The modelling result showed that anionic dyes adsorption occurred via monolayer adsorption, and chemisorption was the rate-controlling step. The adsorbent possesses higher maximum adsorption capacity towards Reactive Black 5 (77.52 mg/g) than Congo Red (34.36 mg/g), due to the higher number of functional groups in Reactive Black 5 that interact with the adsorbent. This study reveals the potential of adsorbent derived from coffee waste in ...
Removal of azo dye from water by adsorption using waste residue from alum manufacturing process
African Journal of Environmental Science and Technology, 2014
Adsorption techniques are widely used to remove certain groups of pollutants such as dyes which are not amenable to biodegradation and environmentally very problematic. Although commercial activated carbon is a preferred sorbent for color removal, its widespread use is restricted due to high cost. As such, alternative non-conventional sorbents should be investigated. It is well-known that natural materials, waste materials from industry and agriculture, and bio sorbents can be obtained without a cost, therefore could be employed as inexpensive sorbents. Therefore the present investigation reports the adsorptive capacity of an industrial residue for the removal of azo dyes. Batch experiments were carried out for the sorption of the dye onto the adsorbent. The influence of contact time, adsorbent dose, pH and initial dye concentration on the adsorption capacity of the material was studied. Kinetics and adsorption isotherms were also studied to evaluate the rate of dye removal and the capacity of the adsorbent. The equilibrium data best fits freundlich isotherm equation. Adsorption capacity (K f) and intensity of adsorption (n) as determined by fitting the equilibrium data to freundlich isotherm equation are calculated to be 0.26 and 0.82, respectively. The adsorption process was found to undergo via a pseudo-second-order adsorption kinetics with a rate constant of 3.81×10-3 (g /mg / min). The removal of dye was not affected for the initial dye concentration range of 15 to 256 mg/L. An adsorption process; requiring an equilibrium time of 30 h with optimum adsorbent dose of 19 g/L for 77.4% dye removal efficiency was observed at near neutral pH. However, as the pH of water is adjusted from 7 to 9, the dye removal efficiency was greater than 90%. The overall result shows that the industrial by product investigated in this study exhibited a high potential for the removal of dye from aqueous solution.
DESALINATION AND WATER TREATMENT, 2018
The coffee residues were used as a low-cost and effective adsorbent for the removal of methyl red from aqueous solution. The experiments were performed using operating parameters including initial dye concentration, contact time, solution pH, and adsorbent dosage under batch adsorption technique. The maximum methyl red removal (96.8%) was obtained at pH (2.0), contact time (20 min), initial dye concentration (10 mg/L), and adsorbent dose (0.5 g). The operating parameters such as initial dye concentration, contact time, pH, kinetic study, and adsorbent dosage were conducted; and the adsorption capacities were characterized by using the UV-Visible spectroscopy. The coffee residue before and after adsorption of methyl red was characterized by Fourier transform infrared spectroscopy. The results demonstrated that the coffee residues are very effective, simple, and inexpensive adsorbent in the removal of methyl red from aqueous solution because of its considerable adsorption capacity and abundance. The adsorption isotherms for Langmuir and Freundlich models were determined using the adsorption data. It was found that Freundlich isotherms described very well with the adsorption behavior of methyl red on coffee residue and followed the pseudo-second-order kinetic model.
Alumina-Activated Carbon Composite as Adsorbent of Procion Red Dye from Wastewater Songket Industry
The Journal of Pure and Applied Chemistry Research, 2015
Alumina-activated carbon composite has been synthesized and studied for adsorption procion red dye. Composite was prepared by precipitation method aluminium hydroxide on the surface of activated carbon followed by calcinations. The Fourier transform Infra Red (FTIR), Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDS) and Brunaeur Emmet Teller (BET) surface are being used to characterize the adsorbent. Batch adsorption experiments were carried out for the adsorption of procion red dye. Effect of the mass of composite, stirrer speed, contact times and pH of the solution on the adsorption capacity were studied. The obtained optimum conditions applied to adsorp of procion red dye from wastewater songket industry. The result showed that the adsorption optimum at mass of alumina-activated carbon composite 0.1 g, stirrer speed 150 rpm, contact times 2 hours at pH of the solution 9. The adsorption isotherm data according to Langmuir isotherm. The alumina-activated carbon composite can be removal of procion red dye from wastewater songket industry with effectiveness adsorption of 88.21 %.