Use of Tunisian raw clay to remove dye from aqueous solution (original) (raw)
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Treatment of Tannery Effluent by Tunisian Clay
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The tannery effluent from the wet finishing stage is a complex, highly charged rejected of organic and mineral matter. It has variable characteristics over time and is not readily biodegradable. Its physicochemical treatment by adsorption on the smectitic clay of Khledia proves to be effective. The reduction of dye, BOD, COD, heavy metals are remarkable. The decrease of the conductivity is due to the phenomenon of the cations adsorption on the negatively charged support colloids.
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.
2017
The treatment of textile effluents is still a great challenge and constant research is done to find sustainable efficient processes. Natural clays are promising adsorbents for removal of pollutants, particularly dyes from effluents. But there is a need of better understanding the mechanisms of adsorption, especially in the case of anionic dyes. In this study, we investigated the adsorption capacities for RR120 anionic dye, of raw clays such as Tabarka (kaolinite and illite), Fouchana (smectite, kaolinite and illite), a standard kaolinite (KGa-2), and a standard palygorskite (PFl-1). Batch experiments were performed by varying different parameters. Electrophoretic mobility and streaming induced potentials (SIP) measures were done to investigate the clays surface charges and the dye-clay interactions during adsorption. The results showed that although palygorskite exhibits the highest porosity and specific surface, its capacity to adsorb RR120 is the lowest compared to the other clays...
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...
A STUDY OF THE REMOVE CATIONIC AND ANIONIC DYES IN AQUEOUS SOLUTION BY A NEW NATURAL CLAY
The objective of this work is to study the possibility of eliminating both dyes Methylene Blue (MB) and Congo Red (CR) by adsorption on natural clay of the region of Agadir and determine the different reaction parameters effect on the proceeds. Orientation tests have been carried out in distilled water solutions. The results of the kinetics of adsorption showed that optimal contact time is 60 min; it corresponds to a maximum removal rate of MB and CR respectively of the order of 99% and 75%. Increased adsorbent ratio (0,1 à 2 g / l) improves the removal efficiency of the CR especially dyes for an initial concentration of 10 mg/l. NaNO3 salt and pH of the medium greatly influence the CR of retention. Whatever the reaction parameter tested; it appears that the clay has a good efficiency for the retention of two dyes.
A Brief Comparative Study on Removal of Toxic Dyes by Different Types of Clay
Dyes and Pigments - Novel Applications and Waste Treatment, 2021
Increasing amount of organic dyes in the ecosystem particularly in wastewater has propelled the search for more efficient low-cost bio adsorbents. Different techniques have been used for the treatment of wastewater containing toxic dyes such as: biological degradation, oxidation, adsorption, reverse osmosis, and membrane filtration. Among all these processes mentioned, adsorption with low cost adsorbents has been recognized as one of the cost effective and efficient techniques for treatment of industrial wastewater from organic and inorganic pollutants. Clays as material adsorbents for the removal of various toxic dyes from aqueous solutions as potential alternatives to activated carbons has recently received widespread attention because of the environmental-friendly nature of clay materials. This chapter presents a comprehensive account of the techniques used for the removal of industrial cationic and anionic dyes from water during the last 10 years with special reference to the ad...
Pre-treated Moroccan natural clays: application to the wastewater treatment of textile industry
DESALINATION AND WATER TREATMENT, 2021
The current study was carried out to examine the pre-treated Moroccan natural clays for the removal of methylene blue dye by the adsorption method. The adsorbent was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy. After performing the experiment and analyzing the data, it was found that the optimum conditions for fixing yellow marl and kaolinite (0.05 mm) are 93%-98%. The adsorption kinetics of methylene blue on kaolinite (C = 300 ppm, 50 µm) and on yellow marl (C = 500 ppm, 50 µm) is very efficient. Kaolinite adsorbed better towards basic pH. The equilibrium adsorbed amounts reached 27.5 mg g-1 for yellow marl and 16 mg g-1 for kaolinite. Application of the membranes developed in the treatment of dyes shows that the rejection rates obtained depend on the charge of the ions, their sizes, the charge of the membrane linked to the pH of the filtered solution. The difference in adsorption capacity between the two clays studied is due to the percentage of the clay phase in each and its composition.
Journal of African Earth Sciences, 2019
The aim of the present work was to study the application of natural clays to remove a cationic dye (methylene blue (MB) chosen as a pollutant model) from wastewater. Rhassoul-clay and Red clay investigated in this study were extracted from two different sites in Morocco. These clays have different swelling properties. A comparison of their affinity towards cationic dye help to understand the limiting factors controlling the adsorption process. Rhassoul clay and Red clay were characterized using powder X-ray diffraction, Scanning Electron Microscopy, Xray Fluorescence spectroscopy and surface area measurement (BET). The adsorption capacities of the solids were measured using batch sorption studies as a function of contact time, pH, temperature and initial concentration. Pseudo-second-order model and intraparticle diffusion model were applicables to describe the MB adsorption on both adsorbents. Langmuir and Freundlich isotherms were employed to determine adsorption mechanism. According to the results, the Langmuir model was more suitable to describe MB adsorption on both adsorbents. The maximum monolayer adsorption evaluated with this model is 166.7 mg g −1 and 18.7 mg g −1 for Rhassoulclay and Red clay, respectively. The temperature exhibited a positive effect on MB adsorption. According to Gibbs energy and enthalpy, the adsorption process was spontaneous and endothermic for both clays, but was more favorable for Rhassoul clay. Hence, Rhassoul clay exhibits much higher adsorption capacity than Red clay. The both clays studied could be potentially used for the removal of cationic dye from wastewater.
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.
Valorization of Tunisian Pottery Clay onto Basic Dyes Adsorption
International Journal of Environmental Research, 2014
This study examined the adsorption behavior of two cationic dyes used in textile industries (CIBasic Red 46 and CI Basic Blue 3) on Tunisian clay used in pottery. The ability of pottery clay to remove thebasic dyes from aqueous solution was compared to that of the commercial powdered activated carbon (PAC)and raw clay. Physicochemical characteristics of these adsorbents were performed by Boehm dosage, pHPZCand CEC determination, particle size distribution and spectroscopic analysis (FTIR and UV-Vis). The pHPZCof the pottery clay was about 9.86 and the CEC was about 15.6 meq/g. The empirical kinetic data fitted verywell the pseudo second order model for the adsorbent studied. The isotherm data fitted rightly to the Langmuirisotherm model. The maximum adsorption capacities of the raw clay, pottery clay and PAC onto CI Basic Red46 (CI Basic Blue 3) were respectively2806 mmol/g(785 mmol/g), 2114mmol/g (116.2mmol/g) and 2123mmol/g (343.9 mmol/g). These results showed the large adsorption...