Simultaneous Adsorption of Tri- and Hexavalent Chromium by Organoclay Mixtures

Sarkar, Binoy; Naidu, Ravi; Megharaj, Mallavarapu

doi:10.1007/s11270-013-1704-0

Cited by 23 publications

(5 citation statements)

References 42 publications

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“…The primary diffraction peak attributed to 001 plane for natural bentonite appeared at 2θ value of seven, and the corresponding spacing value is 1.26 nm (Figure 1a), which is near to the range commonly reported for natural bentonite (~1-1.2 nm) (Sarkar, Naidu, and Megharaj 2013). With modification of Fe and Al, the (001) diffraction peak shifts toward low angle, i.e., the d(001) spacing increased.…”

Section: Sample Characteristicssupporting

confidence: 68%

Adsorption Behavior of Cr(VI) on Al-Fe Cointercalated Bentonite

Cao

Liang

Yin

et al. 2015

Marine Georesources & Geotechnology

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An efficient Al-Fe co-intercalated bentonite composite material (Al-Fe/Bent) able to remove hexavalent chromium (Cr(VI)) from aqueous solutions was prepared. The batch experiments studies were conducted to evaluate the adsorption performance of Cr(VI) contained in aqueous solution. The XRD results showed the spacing of layers of bentonite was increased due to the Downloaded by [University of Otago] at 14:26 08 October 2015 aluminum and iron polycation intercalated into the layer of bentonite. The removal rate of Cr(VI) from the aqueous solution could be up 87.4% under the condition of the dosage of Al-Fe/Bent 8 g/L, pH 4, and contact time 60 min. The equilibrium data fitted well to the Freundlich model.The adsorption process could be well described by the pseudo-second-order kinetic model.

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Section: Sample Characteristicssupporting

confidence: 68%

Adsorption Behavior of Cr(VI) on Al-Fe Cointercalated Bentonite

Cao

Liang

Yin

et al. 2015

Marine Georesources & Geotechnology

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“…This pH range is also suitable for illite formation as an Al, Mg and Fe-bearing phyllosilicate clay mineral [88]. Moreover, Hg absorption into the soil is also enhanced by the presence of these clay minerals [89]. Studies from [90] indicated that trace elements such as Cr, Co, Cu, Fe, Mg, V and Ni turn to be trapped within the duricrust layer along the soil profile even though they are normally mobile in the weathering environment.…”

Section: Petrogenetic Significancementioning

confidence: 99%

Heavy Metal Contamination and Ecological Risk Assessment in Soils of the Pawara Gold Mining Area, Eastern Cameroon

Ismaila

Yannah

Wirmvem

et al. 2022

Earth

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Pawara area is a mining district in the eastern region of Cameroon. Mining in the area is generally artisanal and semi-mechanized, practiced by the local miners and immigrants from neighboring African countries and China. The lack of strict regulations and control of mining activities permits the miners to use illegal substances, especially Hg in gold separation. These expose the area to toxic and heavy metals pollution. This study highlights the source of heavy metals concentration in the Pawara soils and the potential adverse effects of Hg on gold separation to the environment and health. Three mining sites and one control site were investigated, namely Site A, Site B and Site C. The control Site 0 (background) is an area where no mining and agricultural activities have taken place. Soil samples were collected at depth of 20 cm, with six from each site (24 samples). Samples were analyzed for Al, Cd, Cr, Cu, Fe, Hg, Pb, Cd and Zn content using atomic absorption spectrophotometry in a graphite furnace. The metals, except for Fe, show high values for all three sites exceeding the background levels in the soils. Hg shows the highest concentration on Site A with a value of 1590 mg kg−1. Pb is highest on Site B with a concentration of 12,274 mg kg−1. The contamination degree was assessed with the help of contamination indices (Igeo—index of geo-accumulation; PLI—pollution load index; RI—potential ecological risk; Eri—ecological risk; Pi—single pollution index; CF—contamination factor) and all parameters show a high degree of contamination on all three sites compared to the control site. Hg, Pb, Cd, Cr and Cu as single pollutants show the highest ecological risk on Site A and Site B where intense mining is taking place. The absence of industrial and large-scale agricultural activities in the Pawara area, the nonexistence of contaminants on the control site and the presence of contaminants on Site C where farming is high and mining is low jointly show that the discharge of mine wastes onto the soils and stream channels are the main source of contaminants and potential pollutants of the Pawara ecological environment.

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“…Recent works have shown that many materials such as functionalized nanomaterials, magnetic particles, functionalized silica, nanotubes, etc. [1-8, [16][17][18][19][20][21][22][23] have been used as effective adsorbents for the removal of Cu(II) or Cr 2 O 7 2À from wastewater. However, to the best of our knowledge, most of published works on these adsorbents only focus on the excellent selectivity of Cu(II) cations [1, 5,6,[20][21][22] or the perfect extraction of Cr 2 O 7 2À metalloid anions [2][3][4][16][17][18][19].…”

Section: àmentioning

confidence: 99%

Efficient simultaneous removal of Cu(II) and Cr2O72− from aqueous solution by a renewable amphoteric functionalized mesoporous silica

You

et al. 2015

Chemical Engineering Journal

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Simultaneous Adsorption of Tri- and Hexavalent Chromium by Organoclay Mixtures

Cited by 23 publications

References 42 publications

Adsorption Behavior of Cr(VI) on Al-Fe Cointercalated Bentonite

Adsorption Behavior of Cr(VI) on Al-Fe Cointercalated Bentonite

Heavy Metal Contamination and Ecological Risk Assessment in Soils of the Pawara Gold Mining Area, Eastern Cameroon

Efficient simultaneous removal of Cu(II) and Cr2O72− from aqueous solution by a renewable amphoteric functionalized mesoporous silica

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