Adsorption Cadmium Ions
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Adsorption of Calcium(II), Cadmium(II) and Copper(II) Ions from Water by Prepared Silicon-Aluminum-Zirconium Oxide Using Sol-Gel Process
Ternary oxide silica-alumina-zirconia (SiO2/Al2O3/ZrO2) obtained by the sol-gel process was applied as novel adsorbent of ions in aqueous solution. Batch isotherms were performed using standard CuII, CdII and CaII solutions at variable pH and different concentrations. Adsorption capacity was best at weakly acidic pH. The maximum adsorption capacities were 2.
J. Braz. Chem. Soc.. Publicado em: 2021-07
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2. Application of a Novel Ion-Imprinted Polymer to the Separation of Traces of CdII Ions in Natural Water: Optimization by Box-Behnken Design
This study describes the preparation of a novel ion-imprinted polymer (IIP) to apply pre-concentration of cadmium ions in water samples of the Pontal Bay in Ilhéus, Brazil. First, cadmium ion was complexed with 2-(2-thiazolylazo)-p-cresol (TAC). Subsequently, there was the polymerization using ethylene glycol dimethacrylate and methacrylic acid monomers alo
J. Braz. Chem. Soc.. Publicado em: 2019-04
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3. Catalytic hydrogen generation from NaBH 4 /H 2 O system: effects of catalyst and promoters
Abstract A hydrogen generation system based on NaBH4 hydrolysis is affected by the nature of the catalyst and catalyst promoter. Various catalyst promoters such as Al2O3 nanoparticles, Al2O3 particles, ZrO2 sand, SiO2, MMT clay, CNT and zeolite are compared with respect to hydrogen generation (HG) and hydrogen generation rate (HGR). The highest HG and HGR ar
Braz. J. Chem. Eng.. Publicado em: 2018-01
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4. A Kinetic, Equilibrium, and Thermodynamic Study on the Biosorption of Tl+ and Cd2+ by Eichhornia crassipes Roots Using Carbon Paste Electrode
In this work, Eichhornia crassipes roots were used as a modifier for carbon paste electrode in a biosorption study of thallium (Tl+) and cadmium (Cd2+) ions. The ions were accumulated on modified electrode surfaces at open circuit potential and analyzed by square wave anodic stripping voltammetry. Before the biosorption study, the effect of ratio of biomass
J. Braz. Chem. Soc.. Publicado em: 2016-09
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5. Removal of Cadmium(II) and Lead(II) ions from aqueous phase on sodic bentonite
This paper describes the adsorption of Cd2+and Pb2+ions using sodic bentonite clay type Fluidgel modified. The Fluidgelbefore and after chemical modification and thermal activation was characterized by different techniques including X-ray diffraction, thermal analysis, Fourier transform infrared, surface area, helium pycnometry, cation exchange capacity and
Mat. Res.. Publicado em: 28/01/2013
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6. Removal of lead and cadmium ions in different adsorption systems / ion exchange in bentonite clay type Fluidgel / Remoção de íons de chumbo e cádmio em diferentes sistemas de adsorção/troca iônica em argila bentonítica tipo Fluidgel
Neste trabalho foi avaliada a capacidade de remoção de metais pesados comumente encontrados em efluentes e aterros sanitários da região metropolitana de Campinas, mais especificamente o chumbo e o cádmio, utilizando argila bentonítica sódica tipo Fluidgel extraída de jazias do nordeste brasileiro (Boa Vista - PB). A argila Fluidgel foi fornecida na f
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/08/2012
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7. Adsorção de chumbo, cádmio e prata em óxido de nióbio (V) hidratado preparado pelo método da precipitação em solução homogênea
This paper describes the adsorption of heavy metals ions from aqueous solution by hydrous niobium oxide. Three heavy metals were selected for this study: cadmium, lead and silver. Adsorption isotherms were well fitted by Langmuir model. Maximum adsorption capacity (Q0) for Pb2 +, Ag+ and Cd2 + was found to be 452.5, 188.68 and 8.85 mg g-1, respectively.
Química Nova. Publicado em: 2011
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8. Removal of cadmium and nickel from aqueous solution using expanded perlite
The adsorption characteristics of cadmium and nickel onto expanded perlite from aqueous solution have been investigated with respect to changes in pH of solution, adsorbent dosage, contact time and temperature of the solution. The maximum removal efficiency of Cd (II) is 88.8% at pH 6 and exposure to 10 g/L expanded perlite, while for Ni (II), it is 93.3% at
Brazilian Journal of Chemical Engineering. Publicado em: 2010-06
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9. Thermodynamic and kinetic studies of cadmium adsorption from aqueous solution onto rice husk
The adsorption behavior of rice husk for cadmium ions from aqueous solutions has been investigated as a function of appropriate equilibrium time, adsorbent dose, temperature, adsorbate concentrations and pH in a batch system. Studies showed that the pH of aqueous solutions affected cadmium removal with the result that removal efficiency increased with increa
Brazilian Journal of Chemical Engineering. Publicado em: 2010-06
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10. MODIFICATION OF SILICA PROPILETILENODIAMINA WITH FORMALDEHYDE - A STUDY OF EQUILIBRIUM AND THE KINETICS OF ADSORPTION OF CADMIUM, LEAD AND CHROMATE IONS. / Modificação da sílica propiletilenodiamina com formaldeído, estudo do equilíbrio e da cinética de adsorção dos íons cádmio, chumbo e cromato
In this work, modified silica gel with the group aminopropiletanoimina was used as retention capacity for the ions cadmium, lead and cromate. The tests were accomplished in aqueous solutions under different conditions of pH, in constant temperature of 2981 K. The number of mol of the organic chain anchored to the matrix was 0,97mmol /g. The analysis of the c
Publicado em: 2009
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11. Equilibrium study of binaries and ternary ion exchange systems envolving copper, cadmium and calcium ions by alginate biopolymer / Estudo do equilibrio dos sistemas binarios e ternario de troca ionica dos ions cobre, cadmio e calcio pelo biopolimero alginato
In this work, it was studied the ion exchange process involving copper, cadmium and calcium ions. The heavy metals, copper and cadmium, were evaluated due to its high toxicity, its presence in industrial effluent and difficulty in its removal when in low concentrations, however, above permitted levels by law. Alginate was used as ionic exchanger. In the pres
Publicado em: 2009
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12. Influence of chemical modification of the surface of iron oxides in adsorption of cadmium and lead / Influência da modificação química de superfície de óxidos de ferro na adsorção de cádmio e chumbo
The treatment of wastewater from industrial processes is of paramount importance to avoid contamination of ecosystems. The development of methods of low cost sewage treatment aims to help companies to adapt to new times. Given that this study sought to produce a new adsorbent of low cost, by modifying a surface of iron oxide and assess whether it had potenti
Publicado em: 2009