Removal of chromium from aqueous solutions by diatomite treated with microemulsion

Dantas, Tereza Neuma de Castro; Neto, Afonso Avelino Dantas; Moura, M. C. P. A.

doi:10.1016/s0043-1354(00)00507-8

Cited by 119 publications

(30 citation statements)

References 16 publications

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“…Among these methods, adsorption is a widely used method for de¯uoridation which depends on ions (adsorbate) in¯uid diffusing to the surface of a solid (adsorbent), where they bond with the solid surface or are held there by weak intermolecular forces [5]. Different¯uoride adsorbents, such as activated alumina [6],¯y ash [7], bone charcoal [8], spent catalysts [9], La(III) and Y(III)-impregnated alumina [10], and aluminum-impregnated carbon [11], have been investigated and have shown that large surface area and physicochemical interaction between adsorbate and adsorbent were important factors effecting¯uoride adsorption form water.…”

Section: Materials Research Bulletin 38 (2003) 469±476mentioning

confidence: 99%

Adsorption of fluoride from water by aligned carbon nanotubes

Wang

Zhang

et al. 2003

Materials Research Bulletin

313

112

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Aligned carbon nanotubes (ACNTs), a new type of carbon material, were prepared by catalytic decomposition of xylene using ferrocene as catalyst. The kinetics experiment of ACNTs shows that¯uoride adsorption rate is fast in the ®rst 60 min and the adsorption capacity reaches 3.0 mg/g rapidly, then it decreases and adsorption achieves equilibrium gradually in about 180 min. The¯uoride adsorption of ACNTs depends slightly on the solution pH value. The highest adsorption capacity of ACNTs occurs at pH 7 and reaches 4.5 mg/g at equilibrium uoride concentration of 15 mg/l. The experimental results indicate that ACNTs are promising candidate materials for¯uoride removal. #

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Section: Materials Research Bulletin 38 (2003) 469±476mentioning

confidence: 99%

Adsorption of fluoride from water by aligned carbon nanotubes

Wang

Zhang

et al. 2003

Materials Research Bulletin

313

112

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“…With the additional value of being inexpensive and readily available, natural clay aluminosilicate possesses unique combination of physical and chemical properties which makes it suitable for a wide range of industrial applications (Wu et al 2005;De Castro Dantas et al 2001;Irani et al 2011;Khan et al 2015;Jiang et al 2010;Gupta 2006, 2008a, b;Gupta and Bhattacharyya 2008;Karaoglu et al 2010). However, it is important to increase its adsorptive capacity of natural adsorbent to meet wider range of challenges; this is usually achieved by increasing the number of chemically active sites or enlarging its surface area.…”

Section: Introductionmentioning

confidence: 99%

Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

2017

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Photocatalytically modified ceramic adsorbents were synthesized for the removal of high concentration Cu (II) and Co (II) ions from their aqueous solutions. The raw material, diatomaceous aluminosilicate mineral was modified using silver and anatase titanium oxide nanoparticles. Batch adsorption experiment was carried out on the targeted metal ions and the results were analyzed by the Langmuir and Freundlich equation at different concentrations (100-1000 mg/l) and the characteristic parameters for each adsorption isotherm were determined. As-received raw materials do not exhibit any sorption capacity for high concentration Cu 2? and Co 2? adsorbates. However, the adsorption isotherms for modified diatomaceous ceramic adsorbents could be fitted well by the Langmuir model for both Cu 2? and Co 2? with correlation coefficient (R) of up to 0.99953. The highest and lowest monolayer coverage (q max ) were 121.803 and 31.289 mg/g for Cu 2? and Co 2? , respectively. The separation factor (R L ) in the experiment was less than one (\1), indicating that the adsorption of metal ions on the Ag-TiO 2 -modified ceramic adsorbent is favorable. The highest adsorption capacity (K f ) and intensity (n) constants obtained from Freundlich model are 38.832 (Cu 2? on ZEO-T) and 5.801 (Co 2? on STOX-Z).

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“…Many methods have been developed for fluoride removal from water such as adsorption [6], ion exchange [7], membrane processes such as reverse osmosis and nanofiltration [8,9], electrodialysis [10,11], and precipitation [12]. Among these methods, adsorption is a widely used method for defluoridation which depends on ions (adsorbate) in fluid diffusing to the surface of a solid (adsorbent) when they are bound to the solid surface or are held there by weak intermolecular forces [13]. Adsorption is recognized as the most efficient, promising, and widely used fundamental approach in water and wastewater treatment processes [14].…”

Section: Introductionmentioning

confidence: 99%

Removal of Fluoride from Water by Adsorption onto Fired Clay Pots: Kinetics and Equilibrium Studies

Kofa

Gomdje

Telegang

et al. 2017

Journal of Applied Chemistry

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Excessive fluoride in potable water is a serious health problem in rural areas of many developing countries. Hence, there is a need to find a simple and cost-effective method for water defluoridation in such areas. In the northern part of Cameroon, clay pots are used for cooking food and water storage. The firing of these pots consists of intensive burning using fire wood. They were tested as a potential adsorbent for removing excess fluoride from water. Experiments were carried out in a jar test at room temperature (25 ± 2 ∘ C). Effects of contact time (0-90 min), pH (4, 5, 7, 8, and 9), stirring speed (60, 90, 120, and 200 rpm), and ionic strength (0-1000 mg/L) were investigated. Results showed that equilibrium was attained in 10 min whatever the pH. Pseudo-second-order and pore diffusion models described well the adsorption process. The highest amount of fluoride adsorbed (1.6 mg/g) was obtained at pH 4-5 and the optimum stirring speed is 120 rpm. Ionic strength has a significant effect on fluoride adsorption.

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Removal of chromium from aqueous solutions by diatomite treated with microemulsion

Cited by 119 publications

References 16 publications

Adsorption of fluoride from water by aligned carbon nanotubes

Adsorption of fluoride from water by aligned carbon nanotubes

Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

Removal of Fluoride from Water by Adsorption onto Fired Clay Pots: Kinetics and Equilibrium Studies

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