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Adsorption of CrVI in Aqueous Solution Using a Surfactant-Modified Bentonite Clay minerals can be modified organically by a cationic surfactant resulting in materials known as organoclays. The organoclays have been used as adsorbents of most of the organic contaminants in the aqueous solution and oxyanions of the heavy metal.
Langmuir and Freundich adsorption isotherm models were applies to analyze adsorption data and both were found to be applicable to these adsorption process. Thermodynamic parameters e.g. G , S and H ofthe adsorption process was found to be endothermic. Finally it can be seen that bentonite
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Mar 01, 2000 The adsorption process was significantly influenced by the solvent type in which phenol was dissolved. The affinity of phenol to bentonite in the presence of cyclohexane was greater than that in water and was lowest in the presence of methanol. Methanol was used to extract phenol from bentonite.
30 min for adsorption. After adsorption reaction, put PAM into beaker and string for a few minutes, then n- co tent settle for 30 min, the supernatant in the was beaker taken out and used for the analyses. The chemical oxygen demand CODcr of the water sample was determined by colorimetric methods. The
Oct 20, 2020 The specific surface areas and the total pore volumes of the composites were considerably increased in comparison with matrix of bentonite. The products gave superior adsorption of NR dye, for example, 145 mgg onto BC2 and attained good reusability of adsorbent where 90 of NR dye was removed on the third run at pH 5 and temperature of 25 C.
Apr 01, 2012 At the given adsorption conditions T 25 C, pH 7.0, contact time 24 h, CR concentration 1000 mg L 1 and bentonite dosage 10 g L 1, ATA bentonite received the highest increase in adsorption capacity of 74.5 mg g 1, followed by AA bentonite 61.5 mg g 1 and TA bentonite 52.6 mg g 1, which were significantly ...
The adsorption bands in the range of 400-4,000 cm-1 were recorded. The bentonite samples were coated with Au under vacuum in an argon atmosphere for scanning electron microscopy SEM by Philips series XL30 Scanning Electron Microscope Holland. General phosphate adsorption procedure
The adsorption of CdII onto HACCbentonite was examined in aqueous solution with respect to the pH, adsorbent dosage, contact time, temperature and initial concentration.
The adsorption ability of natural bentonite of Slovak provenience was compared with that of composite material based on bentonite. The magnetic composite material was prepared using the method of ...
determine the adsorption capacity and the removal efficiency 6. Bentonites tested The clay that we used is a rich montmorillonite . bentonite and from south-eastern Tunisian deposits Hicha El Hamma. It is a calcium, grey bentonite and in powder form. Its specific surface area is around 70 m. 2 g. Table 2 presents some characteristics.
Apr 22, 2020 The adsorption capacity of bentonite is substantial at low humidity levels and increases with increasing relative humidity. Silica gel behaves similarly, but becomes even more adsorbent at higher levels of relative humidity. At these higher humidity levels, its very high rate of adsorption can, at times, make silica gel more difficult to handle.
In a fixed-bed column test, the adsorption capacities of 5 modified bentonite with 95 sand, and 10 modified bentonite with 90 sand were 0.31 mg g1 and 0.35 mg g1, respectively.
In this work, the adsorption desulfurization technique was applied for heavy crude oil Baghdad east field with 4.31 sulfur content and treated with modified Iraqi bentonite Fe and H-bentonite ...
Thus, the sodium bentonite use is suggested for the adsorption of the lactose as tertiary treatment of the effluent one of the dairy industry. The evidence of this event as well as its quantification was carried through two distinct techniques thermal analysis and x-ray diffraction.
the SP-bentonite section Figure 2C and in the scan- ning electron micrographs of Figure 1. The surface area of the SP-bentonite was practically identical to that of the bentonite powder--634 and 644 m2g, respectively, calculated on the basis of 0.286 m2 mg EGME ethylene glycol monoethyl ether adsorbed.
Oct 05, 2011 Adsorption was studied through batch adsorption tests. The effect of the nature of the bentonite sodium versus calcium activated was studied. Results obtained in this study show that, contrary to what has been observed for volatile organic compounds VOCs, the adsorption
Mar 30, 2016 Results show that samples adsorption capacity for phosphate is in the order of, unmodified bentonite acid thermoactivation Rewoquate calcium Irasoft Fe Al Fe-Al. The phosphate adsorption with Fe-Al-bentonite FAB modification was more than 99 and the phosphate removal reached the peak value in the initial 30 min.
The removal of three basic dyes by adsorption onto bentonite was investigated for single, binary, and ternary solutions in a batch system. Before and after dye adsorption, bentonite samples were analyzed by using Xray fluorescence spectrometer, SEM, and Fourier transform IR spectrometry.
The adsorption of AsV was strongly dependent on solution pH, and the maximum adsorption of modified bentonites was obtained in the pH 3.0 for Fe-bentonite and the pH 4.0 for Al-bentonite. The equilibrium adsorption study showed that the data were well fit by the Langmuir isotherm model.
a bentonite amp PAM particle flocculation system was em-ployed in recycled fiber pulping wastewater treatment. Bentonite, clay, coke, activated sludge and some other materials were used as adsorption aids to improve floc-culation efficiency 6,7. Bentonite, which is available in large quantities, can be used as an adsorbent for the re-
Energy storage through adsorption and desorption of water vapour in raw Saudi bentonite. ... K2 were 0.0003 for Ca-kaolinite and 0.0017 for Ca-bentonite. The, values of adsorption maximum X ...
The adsorption experimentwas carried out in the batch system bentonite was added to 100 ml of synthetic solution of dyes and mixed on an orbital shaker at 160 rpm. Four parameters were considered to assess the adsorption capacity of the bentonite clay these included the adsorbent particle
Key words Clay based sorbents, sorption of uranium, langmuir and freundlich adsorption models, adsorption capacity. 1. Introduction Exploitation andor disturbance of natural reserves of U Uranium in Norway, as shale deposits from the Cambrian era could release significant amounts of radionuclides to the environment during and after
The adsorption capacity of bentonite is substantial at low humidity levels and increases with increasing relative humidity. Silica gel behaves similarly, but becomes even more adsorbent at higher levels of relative humidity. At these higher humidity levels, its very high rate of adsorption can, at times, make silica gel more difficult to handle.
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