Adsorption of Ni(II) on clays

Gupta, Sanjay; Bhattacharyya, Krishna G.

doi:10.1016/j.jcis.2005.07.073

Cited by 324 publications

(160 citation statements)

References 58 publications

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“…Chien and Clayton [28] later introduced it into soil chemistry, and the parameters of α and β were used to estimate the reaction rate. Though questioned by Sparks [29], the concept that the increase in α corresponds to the increase in reaction rate has still been adopted by some latest literatures [30,31]. In this study the good fit (r 2 > 0.939) of Elovich equation for both samples (Table 2) implied that a diffusion process was involved in the Cu and Cd adsorption.…”

Section: Adsorption Kineticsmentioning

confidence: 68%

Surface modification of goethite by phosphate for enhancement of Cu and Cd adsorption

Zhang

Shan

2007

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Section: Adsorption Kineticsmentioning

confidence: 68%

Surface modification of goethite by phosphate for enhancement of Cu and Cd adsorption

Zhang

Shan

2007

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…min from a saprolitic laterite ore containig nickel-substituted lizardite (Luo et al, 2009(Luo et al, , 2010. Prolonged leaching decreases nickel extraction due to re-adsorption by re-precipitated amorphous silica (Luo et al, 2009;Gupta and Bhattacharyya, 2006).…”

Section: Requirement For Different Acid Strengthsmentioning

confidence: 99%

Reductive acid leaching of laterite and metal oxides — A review with new data for Fe(Ni,Co)OOH and a limonitic ore

et al. 2011

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The reductive leaching of nickel laterite has attracted the interest of many researchers due to the enhanced kinetics of nickel and cobalt dissolution in the presence of acids and reducing agents during atmospheric, pressure, heap or bio leaching processes. Systematic studies on synthetic oxides and natural ores can shed light on the reaction mechanism and lead to investigations of beneficial reagents for further studies. This paper briefly reviews the literature and describes a comparative study of metal leaching from synthetic goethite spiked with nickel or cobalt and a limonitic laterite ore to rationalise the role of reducing agents in acid media. Results are discussed on the basis of the effect of speciation, surface chemical reactivity of oxides and heterogeneous kinetic models.Key words: Laterite, synthetic oxides, reductive leaching, kinetics, adsorption. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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“…The experiment was conducted by agitating 50 ml of mixed metal solutions containing Cd, Cr, Pb, Cu, and Ni with different initial concentrations (0.8 to 8 mg l -1 of each metal) with chitosan clay adsorbents for 3 hours (Gupta and Bhattacharyya, 2006;Sen Gupta and Bhattacharyya, 2008). The pH of the different sollutions was controlled to be at 6 using either 0.1 M HCl or 0.1M NaCl.…”

Section: Batch Adsorption Experimentsmentioning

confidence: 99%

Exploratory study to assess the impact of chitosan /bentonite ratio on the metal removal capacity of chitosan modified bentonite clay

2016

Global NEST Journal

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Adsorption is one of the methods that can be used for metal removal. In this study five metals were used cadmium, chromium, lead, copper and nickel (Cd, Cr, Pb, Cu, and Ni) over a concentration range from 0.8 to about 7 mg l -1 for each metal. Adsorbents were prepared with increasing chitosan to bentonite ratio from 0 to 0.67 g chitosan/g bentonite. The study showed that adsorption of metals on plain bentonite and chitosan modified bentonite can fit well with Langmuir and Freundlich adsorption isotherms. Furthermore, the bentonite adsorption capacity will decrease with the increase of chitosan/bentonite ratio. This study concluded that bentonite is a good adsorbent. However, the applicability of bentonite as potential adsorbent may be limited by its physical properties such as slow settling rate and difficulty to use it as an adsorbent in adsorption columns. Despite the decrease of maximum theoretical adsorption capacity as a result of chitosan modification, the addition of small amount of chitosan can improve the physical characteristics of bentonite clay to be used as an adsorbent.

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Adsorption of Ni(II) on clays

Cited by 324 publications

References 58 publications

Surface modification of goethite by phosphate for enhancement of Cu and Cd adsorption

Surface modification of goethite by phosphate for enhancement of Cu and Cd adsorption

Reductive acid leaching of laterite and metal oxides — A review with new data for Fe(Ni,Co)OOH and a limonitic ore

Exploratory study to assess the impact of chitosan /bentonite ratio on the metal removal capacity of chitosan modified bentonite clay

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