Adsorption of Basic Dyes onto Natural Clay (original) (raw)
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Dyes adsorption using clay and modified clay: A review
Journal of Molecular Liquids, 2018
The effective use of the sorption properties of different clays as sorbents for the removal of dyes from wastewater has currently received much attention because of the eco-friendly nature of clay materials. Dyes are complex class of organic compound having wide range of applications in textile and food industries and a large amount of dyes are wasted, which get mixed in natural water resources. Mixing of dyes in water resources must be prohibited for the safety of natural ecosystem. The adsorbents (natural and modified) have been successfully for the adsorption of dyes form wastewater. This review article highlights the importance of clay (simple and modified) as an adsorbent for the adsorption of dyes from textile wastewater. Appropriate conditions for clay-dye system and adsorption capacities of a variety of clays are presented and sorption process is critically analyzed in this study. Studies reported the clays as an adsorbent from 2004-2016 are included and different properties for the utilization of clay and clay-based adsorbents are discussed for effective removal of dyes. Based on studies, it was found that the clays (natural and modified) are affective adsorbents for the purification of wastewater containing dyes.
Removal of Basic Dyes from Aqueous Solutions by Adsorption onto Moroccan Clay (Fez City)
Mediterranean Journal of Chemistry, 2019
The main objective of this study was to investigate the potential of natural clay obtained from Fez city, Morocco) as an adsorbent for the removal of basic dyes (Astrazon Blue BG and Astrazon Yellow 7GLL) from liquid effluents. Natural clay was characterised using different physical-chemical methods, including nitrogen adsorption-desorption isotherms, X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), pH of the point of zero charge (pH PZC) and Boehm titration method. The clay was tested to remove various textile dyes from the aqueous solution at room temperature. Parameters such as initial dye concentration, solution pH, adsorbent dosages and contact time were performed in a batch system for controlling the operating conditions. Experimental results indicated that the adsorption process is a fast and spontaneous reaction. A pseudo-second-order kinetic model provides the best fit to the experimental data of BG and YL adsorption onto the natural clay. The adsorption isotherm data of both the dyes onto the natural clay were fitted well to the Langmuir model. A maximum monolayer adsorption capacity of 101 mg.g-1 for BG and 127 mg.g-1 for YL are obtained at 298.15 K. The results suggest that the natural clay could be used as an inexpensive adsorbent for the removal of the textile dyes from aqueous solutions.
Water Resources and Industry, 2015
Inexpensive and easily available Moroccan natural clays were investigated for the removal availability of textile dyes from aqueous solution. For this purpose, the adsorption of methylene blue (MB) as reference molecule, malachite green (MG) representative of cationic dyes and methyl orange (MO) representative of anionic dyes, was studied in batch mode under various parameters. The clays were characterized by means of XRD, cationic exchange capacity and BET surface area analysis. The experimental results show that, the adsorption was pH dependent with a high adsorption capacity of MB and MG in basic range and high adsorption of MO in acidic range. The pseudo-second-order kinetic model provided the best fit to the experimental data for the adsorption of MB and MG by the clays. However, the adsorption of MO was more suitable to be controlled by an intra-particle diffusion mechanism. The equilibrium adsorption data were analyzed by Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. The adsorption process was found to be exothermic in nature in the case of MB and MO. However, the adsorption of MG was endothermic.
Adsorption of an anionic textile dye from wastewater by bentonitic clay mineral
Surface Engineering and Applied Electrochemistry, 2016
In this paper, adsorptive performance of natural clay has been investigated as a potential reactive dye adsorbent, on the basis its promising physical-chemical and morphological properties which were compared to several previous works. Sample used in this work, collected from Grombalia (North-East of Tunisia), has been characterized at the first time. Following its physicochemical study, this sample has been employed and tested as an ion exchange medium, for an anionic toxic textile dye removal from textile effluent and watercourse. Physicochemical experiences confirm that the used clay mineral was a clay of bentonite type having the following structure formula Ca 0.014 Na 0.404 K 0.16 (Si 7.65 Al 0.35)(Al 2.910 Fe 0.762 Mg 0.376)O 22. Dye removal from aqueous solution onto raw (GRb) and purified (GRp) bentonite was investigated, using a batch adsorption technique, as a function of various parameters such as initial dye concentration, contact time, temperature and pH medium. Results prove that the amount of dye removed by the raw and the purified bentonite was found to be around 142 and 294 mg/g respectively. According to previous works this quantity of dye removed from aqueous solution (294 mg/g) reach the anionic exchange capacity of bentonitic sample. A contact time (clay/dye solution) of 20 to 30 min was sufficient to reach adsorption equilibrium. Adsorption rate was fast, more than half of the adsorbed dye was removed from the aqueous solution (C = 10-4 M). The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. Experimental data fit well with Freundlich model (the correlation coefficients, R 2 , was found to be equal to 0.98).
International Journal of Environmental Monitoring and Analysis, 2015
The aim of the present work is to explore and compare the adsorption capacity of two different clays for removal of textile dye from aqueous solutions. For this purpose, the adsorption of Green Remazole 6B; a reactive dye used in textile industry, was studied in batch mode. The clays used were provided from two different deposits in west of Algeria, one located in Ain-Temouchent (C46) and the other in the region of El Bayadh (C32). Before investigating the adsorption of textile dye, the clays were characterized by various techniques of analysis in order to study all the relevant features. The techniques used are: X-ray diffraction, infrared spectroscopy (IR) and Chemical analysis. Chemical analysis and infrared spectroscopy (IR) show that clays are mainly constituted of alumina and silica in major quantities and other elements in minor quantities. XRD analysis shows that C46 is illite clay, contaning kaolinite, smectite and quartz. On the other hand, C32 is kaolinite clay with prese...
SYNTHETIC TEXTILE DYE REMOVAL FROM AQUEOUS SOLUTION USING MODIFIED LOCAL CLAY ADSORBENT
Locally sourced clay from Kuala-Kangsar town in Perak state Malaysia was used in both its raw (RKKC) and modified (MKKC) form as adsorbents for the removal of methylene blue (MB) from synthetic textile wastewater in batch adsorption process. The raw clay was modified through H 2 SO 4 acid treatment, Al(OH) 3 ion exchange, calcinations and then molded into beads before freeze drying. The BET surface areas of RKKC and MKKC were 11 and 100 m 2 /g, respectively; their elemental analysis and surface morphology were determined using scanning electron spectroscopy (SEM). Adsorption isotherm studies of both adsorbents showed that the order of fitness in ascension was Langmuir, Freundlich and Redlich Peterson with their lowest correlation coefficient R 2 values of 0.883, 0.950 and 0.965, respectively; and the adsorption process obeyed pseudo-second-order reaction kinetic. Adsorption of MB on MKKC was spontaneous and endothermic as revealed by the thermodynamic studies of the process. The MKKC was good for adsorption of MB and found to be reusable.
Journal of Chemistry
Clay minerals have large surface areas that contribute to their high adsorption capacity. Pure clays were often used. However, their prices remain expensive. However, the natural clay minerals that are locally available can have economic and environmental benefits for textile wastewater treatment. The tested natural clays had given low removal yields. Therefore, we wanted to test particular rich organic matter clay for adsorbing azo dye, which is a very toxic molecule. In order to make the use of this clay type have a better efficiency for removal of this dye from the polluted waters, the optimal conditions had been specified. The results indicated that advised conditions were as follows: 5 min was the contact time of dye-clay; the better adsorbent masses were 0.25 g and 0.5 g per 100 ml solution for raw (ANb) and purified clays (ANp), respectively; the initial dye concentrations were 1 gL−1 for raw clay and 50 mgL−1 for purified clay; pH solution had any effect on the yield of dye ...
Removal of a Basic Textile Dye from Aqueous Solution by Adsorption on Regenerated Clay
Procedia Engineering, 2012
This work presents a study on the reuse of spent bleaching earth (SBE). The SBE waste was regenerated by impregnation in NH 4 Cl solution followed by heat treatment at 400 °C and washing with 1M HCl. The regenerated material (RSBE) was used in the treatment of a basic textile dye solution. Results showed that the adsorption phenomenon governing this process was best described by the Langmuir model. The adsorption kinetic process was found to follow a pseudo second order model.
Modified red clays as adsorbents in the removal of cationic dyes from aqueous solutions
Digest Journal of Nanomaterials and Biostructures, 2023
Thermal and thermo-chemical modification methods were applied to a red clay mineral and the resulted products were comparatively studied. The modified clays were characterized by XRD, XRF, UV-vis and FTIR spectroscopy. The adsorption properties towards two cationic dyes, namely methylene blue and crystal violet, were investigated and the effect of initial concentration and contact time was analyzed, revealing superior adsorption properties for the thermo-chemical modified clay. The values of dye removal rate are very high, over 85%, with better adsorption of methylene blue and a competition between dyes as demonstrated by using binary solutions. The best match with the experimental results was obtained for the pseudo-second-order kinetic model.
Journal of critical reviews, 2020
Global water pollution caused via dye and pollutants have been reported to need touched an alarming level. These hazardous pollutants pose important threats to ecosystem , humans , due to their carcinogenicity, mutagenicity and toxicity. Different method needed to removal of dyes from waste water, like chemical oxidation, extraction, physical adsorption, electrochemical treatments and zonation. Though, these methods conventional are constrained via little efficiency great cost ,stability, and harmful formation through-produces. Wastewater from production dyestuff is one of the main pollutants water. Different ways have been useful for the remediation of water contaminated. In the present study, the utilize of low-cost, abundantly available, greatly efficient and simply obtained ecofriendly adsorbents like clay and activated carbons have been reported as an alternative to the current expensive ways of dye removal from aqueous solution. .About of the methods depend of the several will yield from (AC). kind of AC is useful: (1) it acts as a dye adsorbent, not only in straight forward methods of the adsorption but too in AC-improved clotting and filtration membrane methods; (2) it strong produces of the oxidizing agents (typically, radicals (_OH)) in electro chemical oxidation dye; (3)it catalysis _OH production in (AOPs); (This reviews kind of clay and AC in dye de-colorization, assesses the possibility of each AC-altered de colorization method and discusses perspectives on future research.