Removal of silver (I) from aqueous solutions with clinoptilolite

Akgül, Murat; Karabakan, Abdülkerim; Acar, Orhan; Yürüm, Yuda

doi:10.1016/j.micromeso.2006.02.023

Cited by 141 publications

(54 citation statements)

References 21 publications

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“…Cabe ressaltar também a importância do uso de zeólitas na recuperação de calor e energia solar (TCHERNEV 2001), na indústria de construção civil (COLELLA et al 2001), como fertilizante na agricultura (MING & ALLEN 2001), na remoção de radionuclídeos liberados acidentalmente no meio ambiente como césio (ZAMZOW et al 1990, FAGHIHIAN et al 1999, DYER et al 2000, ABUSAFA & YÜCEL 2002, BOSCH et al 2004) e radio (ELEJALDE et al 2007), na recuperação de metais como prata (BARRER et al 1969;AKGÜL et al 2006) A elevada superfície interna em relação à externa, dada pela estrutura microporosa das zeólitas, permite a transferência de massa entre o espaço cristalino e o meio externo. Essa transferência, por sua vez, é limitada pelo diâmetro dos poros da estrutura zeolítica (AGUIAR et al 2002).…”

Section: Principais Aplicações Das Zeólitasunclassified

Remoção de metais pesados em solução por zeólitas naturais: revisão crítica

Shinzato

2007

Rev. Inst. Geol.

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RESUMONesta síntese são discutidos os resultados de trabalhos publicados nos últimos anos referentes à aplicação das zeólitas naturais na remoção de metais pesados em solução. A seqüência de seletividade iônica, bem como os parâmetros associados à eficiên-cia de adsorção e capacidade de troca catiônica (CTC), estão inteiramente relacionados à estrutura cristalina das zeólitas e às características químicas dos íons encontrados em solução. Cabe ressaltar que, algumas variáveis externas como temperatura, pH e concentração iônica inicial podem interferir no processo de remoção de metais, assim como na seqüência de seletividade iônica. De forma geral, íons com menor energia de hidratação possuem maior preferência pelos sítios de troca disponíveis nas estruturas das zeólitas. A eficiência de remoção de íons de maior energia de hidratação, por sua vez, pode ser controlada pela sua concentração na solução: quanto menor, melhor. Verifica-se, portanto, que as zeólitas naturais possuem grande potencial de aplicação em tratamentos de efluentes contaminados com metais pesados.Palavras-chave: zeólitas naturais, adsorção, troca iônica, metais pesados. ABSTRACTRecent work on the application of natural zeolites to the removal of heavy metals in solution is discussed. Ionic selectivity sequences of natural zeolites, as well as parameters associated with their efficiency of adsorption and ionic exchange, are closely related to their crystal structure and the chemical characteristics of the ions in solution. It is noteworthy that some external variables such as temperature, pH and initial ion concentration can interfere in the process of removal of heavy metals in solution, as well as in the sequence of ionic selectivity. In general, ions with low energy of hydration have greater preference for available charged exchange sites within the zeolite framework. The efficiency of removal of ions with higher energy of hydration, in turn, can be controlled by its solution concentration: the less concentrated the better. It is evident, therefore, that natural zeolites have a great potential in the treatment of effluents contaminated by heavy metals.

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Section: Principais Aplicações Das Zeólitasunclassified

Remoção de metais pesados em solução por zeólitas naturais: revisão crítica

Shinzato

2007

Rev. Inst. Geol.

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“…It has high potential for separation, purification, adsorption and ion exchange depending on the type of exchangeable cations and their specific positions within the framework structure [4][5][6][7][8][9][10][11][12]. Additionally, high selective cation exchange capacity makes clinoptilolite rich mineral useful in waste water treatment especially in the removal of ammonium and heavy metals such as copper, cadmium, iron, lead, nickel, silver and zinc [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. For the removal of anionic heavy metals such as Cr(VI) and As(V), clinoptilolite rich mineral is not as efficient as it would be in cationic heavy metals and ammonium removal.…”

Section: Introductionmentioning

confidence: 99%

Cr(VI) sorption by using clinoptilolite and bacteria loaded clinoptilolite rich mineral

Erdoğan

Ülkü

2012

Microporous and Mesoporous Materials

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a b s t r a c tBatch sorption experiments were performed in order to understand the potential value of local clinoptilolite rich mineral and its bacteria loaded form in Cr(VI) sorption. The results indicated that Cr(VI) sorption capacities of the sorbents were increased after bacteria loading and the clinoptilolite rich mineral is a promising material in Cr(VI) sorption. Zeta potential and Fourier Transform IR (FTIR) analysis were performed to explain the possible mechanism involved in the Cr(VI) sorption. The results revealed that non-electrostatic forces played a significant role rather than the electrostatic forces. The existence of non-electrostatic forces was confirmed by the FTIR results.

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“…Natural zeolite is generally associated with grassy volcanic rock in natural deposits,, and is available in large quantities at low cost (Tominaga, 2001). Due to the ion-exchange capacity, absorption characteristics, water retention and low cost, natural zeolites have been used in various fields, such as agronomy, horticulture and industry (Akgü et al, 2006). Natural zeolite contains exchangeable cations, such as Mg 2+ , Ca 2+ , K + and Na + .…”

Section: Introductionmentioning

confidence: 99%

Desalination Behavior of Calcined Hydrotalcite From Seawater for Preparation of Agricultural Cultivation Solution Using Natural Zeolite

Wajima¹

2014

EER

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The desalination behavior of calcined hydrotalcite (CHT) from seawater used to treat seawater that was subsequently subjected to zeolite treatment prior to application of irrigation water was investigated. The results revealed that CHT removed Cl -, SO 4 2-, Mg 2+ and Ca 2+ from seawater, but that Na + and K + were almost unchanged, and that CHT treatment made the pH of the solution alkaline. As the solution temperature increased, the solution pH increased, the rate of Mg 2+ , Ca 2+ , Cl -and SO 4 2-removal improved, and greater Cl -removal was observed. Following CHT treatment, the obtained solution (CHT-solution) had a high Na + content and high pH (approximately 12), while treatment of CHT-solution with natural zeolite neutralized the pH of the CHT-solution and reduced the Na + content. Although germination of radish sprouts did not observed using seawater and CHT-solution, the growth of radish sprouts could be observed using the final solution after natural zeolite treatment of CHT-solution.

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Removal of silver (I) from aqueous solutions with clinoptilolite

Cited by 141 publications

References 21 publications

Remoção de metais pesados em solução por zeólitas naturais: revisão crítica

Remoção de metais pesados em solução por zeólitas naturais: revisão crítica

Cr(VI) sorption by using clinoptilolite and bacteria loaded clinoptilolite rich mineral

Desalination Behavior of Calcined Hydrotalcite From Seawater for Preparation of Agricultural Cultivation Solution Using Natural Zeolite

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