Removal of Cu(II) and Cd(II) ions from aqueous solutions using local raw material as adsorbent: a study in binary systems (original) (raw)
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Adsorbent for Removal of Cd (II) and Ni (II) Ions from Binary System
2017
This study involves the preparation of copper oxide nanoparticles using modified sol-gel method. Different techniques such as XRD, SEM, TEM, and AFM were used to characterize and surface studies of it. From XRD analysis, all the reflection peak with relative intensities of different planes, specify the presence of CuO and spectrum revealed that particle size obtained was around (21.11 nm), which agreed fairly well with those estimated from SEM and TEM. SEM, TEM, and AFM analysis of the CuO showed that the diameters of the particles is in a nanometer range. These oxide were used to separate Cd (II) and Ni (II) ions from its aqueous solutions (binary system) via adsorption batch method. The effect of contact time, adsorbent dosage, initial concentration, pH, and temperature have been studied and finally the thermodynamic parameters for the influence of temperature were calculated.
2015
Environmental protection becomes a difficult task as many industries produce wastes that cause serious pollution. An industrial solid waste of sugarcane had been converted into an inexpensive and effective adsorbent to be used for the removal of some metal from aqueous solution. Effect of various parameters e.g., metal ion concentration, adsorbent dose, solution pH, and contacting time on the removal of Cu (II), Ni (II), and Co (II) ions had been studied. Maximum adsorption of Cu (II), Ni (II), and Co (II) ions were 78 %, 72%, and 69 %, occurred at metal ion concentration 70 ppm and at pH value of 6.5, 6.0 and 6.0, respectively. A dose of 14 g/l of adsorbent was sufficient for the optimum removal of metal ions. The material exhibits good adsorption capacity and the adsorption data follow the Langmuir model better than the Freundlich model. Kinetic parameters of adsorbent for the removal of each metal ion from wastewater were studied.
Water Air and Soil Pollution - WATER AIR SOIL POLLUT, 2003
The sorption of copper and cadmium ions using activated carbon,kaolin, bentonite, diatomite and waste materials such as compost,cellulose pulp waste and anaerobic sludge as sorbents is reported. Equilibrium isotherms were obtained for the adsorption of these metals in single and binary solutions. Bentonite presented the highest adsorption capacities for both copper and cadmium. A competitive uptake was observed when both metals are present; copper being preferentially adsorbed by all materials with theexception of anaerobic sludge. Equilibrium data were fitted toLangmuir and Freundlich models, with satisfactory results for most of the adsorbent-metal systems studied.Of all the adsorbents studied, bentonite and compost presentedthe highest removal efficiencies, reaching 99% for copper whencadmium is also present, for initial solution concentrations ofup to 100 mg L-1. Anaerobic sludge has a greater preferencefor cadmium, even in the presence of copper, with removal efficiencies of 98...
Cu (II) Removal from Synthetic Waste Water by Ion Exchange Process
Proceedings of the …, 2011
The objective of this study was to investigate the potential of acid activated South Africa clinoptilolite as an adsorbent in the ion-exchange process for the removal of cations from aqueous solutions. The kinetic parameters affecting the adsorption of Cu (II) ions were studied. The adsorption of Cu (II) from synthetic waste water was found to be dependent on pH, temperature, contact time and initial adsorbate concentration. The pH was varied from 2.5 to 6 and the optimum pH for Cu (II) removal was found to be 4.0. The removal of Cu (II) ions increased with time and attained saturation in about 60-70 min. The equilibrium data showed that the adsorption was endothermic nature. Kinetics data showed that at higher temperatures, the rate of adsorption is higher for the clinoptilolite natural zeolite and that Langmuir equation successfully described the adsorption process.
Cu(II) removal from aqueous solutions: A Review
Copper is a widely known toxic as well as poisonous metal to the living organism with a permissible concentration of 50 μg/litre in aqueous solutions. It is necessary to provide a suitable, environment friendly and cost effective copper removal process to save the world. The biosorption technique was found to be an effective method for the treatment and removal of copper from aqueous solution. The use of eco-friendly and low-cost biosorbent as well as biosorbent regeneration are the effective means of using biosorption techniques for the removal of copper from aqueous solutions. However, this review present the various techniques used in the treatment and removal of copper from aqueous solution with emphasis on biosorption technique.
Colloids and Surfaces B: Biointerfaces, 2013
The potentiality of low cost natural/agricultural waste biomasses for the removal of Cu(II) ion from aqueous solution has been investigated in batch experiments. The effect of various physico-chemical parameters such as initial pH, initial Cu(II) concentration, adsorbent dosage, contact time and temperature has been studied. The optimum pH for adsorption was found to be 6 for all adsorbents used. Kinetics data were best described by the pseudo-2nd-order model. The experimental data were fitted well with Freundlich and Halsey isotherm models. The diffusion coefficient and sorption energy indicated that the adsorption process was chemical in nature. Thermodynamic parameters such as G • , H • and S • were calculated, and it was observed that the adsorption process was spontaneous and endothermic. The mean sorption energy was calculated using Dubinin-Radushkevich isotherm model and it confirmed that the sorption process was chemical in nature. Different active functional groups were identified by FTIR studies which were responsible for Cu(II) ion adsorption process. Application study using electroplating industrial waste water and regeneration experiment of the adsorbent were also investigated. Design procedure for the batch process was also reported.
Removal of copper (II) from aqueous solution by adsorption onto low-cost adsorbents
Journal of Environmental Management, 2008
The use of low-cost adsorbents was investigated as a replacement for current costly methods of removing metals from aqueous solution. Removal of copper (II) from aqueous solution by different adsorbents such as shells of lentil (LS), wheat (WS), and rice (RS) was investigated. The equilibrium adsorption level was determined as a function of the solution pH, temperature, contact time, initial adsorbate concentration and adsorbent doses. Adsorption isotherms of Cu (II) on adsorbents were determined and correlated with common isotherm equations such as Langmuir and Freundlich models. The maximum adsorption capacities for Cu (II) on LS, WS and RS adsorbents at 293, 313 and 333 K temperature were found to be 8. 977, 9.510, and 9.588; 7.391, 16.077, and 17.422; 1.854, 2.314, and 2.954 mg g À1 , respectively. The thermodynamic parameters such as free energy (DG 0 ), enthalpy (DH 0 ) and entropy changes (DS 0 ) for the adsorption of Cu (II) were computed to predict the nature of adsorption process. The kinetics and the factors controlling the adsorption process were also studied. Locally available adsorbents were found to be low-cost and promising for the removal of Cu (II) from aqueous solution. r
2017
Çalışmada, manyetik poli(etilenglikoldimetakrilat-N-vinil-2-pirolidon) [m-p(EG-VPN)] mikrokürelerinin bakır (II) iyonlarının sulu ortamdan uzaklaştırılmasında adsorbent olarak kullanılabilirliği incelenmiştir. Manyetik polimer mikroküreler, elementel analiz, N2 adsorpsiyon-desorpsiyon izoterm testleri, şişme testleri, taramalı elektron mikroskobu (SEM), titreşimli örnek manyetometresi (VSM) ile karakterize edilmiştir. Adsorpsiyon çalışmaları sonucunda m-p(EG-VPN) mikrokürelerinin maksimum adsorpsiyon kapasitesi 270.3 mg/g olarak belirlenmiştir. Ayrıca adsorpsiyon işlemlerinin kinetik, izotermal ve termodinamik özellikleri araştırılmıştır.