Removal of cadmium (II) from aqueous solutions by two kinds of manganese coagulants

Xu, Yunhua; Lei-san, Yang; Yang, Jingkun

doi:10.4314/ijest.v2i7.63733

Cited by 9 publications

(8 citation statements)

References 19 publications

(18 reference statements)

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“…The concentration of Cd was reduced to low levels by both the precipitants. Xu [33] carried out batch studies with two types of manganese coagulants, HMO prepared from KMnO 4 and Na 2 S 2 O 3 and HMFO prepared from KMnO 4 and Fe 2 SO 4 . Results revealed that HMO is an efficient coagulant for removal of trace Cd from water.…”

Section: Coagulation/flocculationmentioning

confidence: 99%

A comprehensive review on Cd(II) removal from aqueous solution

Purkayastha

Mishra

Biswas

2014

Journal of Water Process Engineering

167

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Section: Coagulation/flocculationmentioning

confidence: 99%

A comprehensive review on Cd(II) removal from aqueous solution

Purkayastha

Mishra

Biswas

2014

Journal of Water Process Engineering

167

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“…Although many different methods such as chemical precipitation [7,16], ion exchange [17], solvent extraction [18,19], reverse osmosis [20], dialysis/electrodialysis [21], supported liquid membrane [22] and adsorption [23][24][25] have been documented for the removal of heavy metal ions, the process based on adsorption methods is promising, due to its low cost and high removal efficiency [26]. Many low-cost materials [27][28][29][30][31][32][33][34][35][36] have been reported for Cd(II) removal from water and wastewater systems, but they are not very popular because of various limitation like cost, removal efficiency and maintenance.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Equilibrium and kinetic studies of Cd(II) ion adsorption from aqueous solution by activated red mud

Sahu

Mandal

Yadav

et al. 2015

Desalination and Water Treatment

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Red mud is an undesirable by-product of bauxite in Bayer process has been used as a low-cost adsorbent for the removal of Cd(II) from aqueous solution by batch mode of experiment. The red mud was activated by acid dilution followed by ammonia precipitation for better adsorption of Cd(II). To achieve optimum condition for adsorption, different variable parameters were studied. X-ray diffraction, SEM and EDX were used to characterize the adsorbent before and after cadmium adsorption. The maximum adsorption capacities of Cd(II) on activated red mud (ARM) were found to be 12.046 and 12.548 mg g −1 at temperature 293 and 303 K, respectively. Adsorption data of Cd(II) are best fitted to linearly transformed Langmuir isotherm with R 2 > 0.99. The pseudo-second-order model describes the kinetics of Cd(II) adsorption successfully to predict the rate constant of adsorption. Thermodynamic parameters reveal the endothermic, spontaneous and feasible nature of adsorption of Cd(II) onto ARM. The mass transfer study led to compute the external mass transfer coefficient (k f ) by the equation of McKay et al. and Weber-Mathews at temperature 293 and 303 K. The desorption efficiency of Cd(II) ions from ARM was 91.29% using 0.2-mol L −1 HCl.

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“…Large IL to water ratio quantity (1:1) was also employed (Earle and Seddon, 2000;Sereshti et al, 2014). Moreover, the extraction activities using ionic liquids were carried out from water samples containing far greater concentrations (Hernandez et al, 2010) than the metal ions found in real samples (Xu et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Removal of cadmium ions from aqueous solution using very small ionic liquids to water ratio without metal chelator and pH modifications

Abebe¹,

Tilahun²,

Mesfine³

et al. 2017

Eth J Sci & Technol

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Solvent extraction is an energy-efficient technology which uses two immiscible phases. In this regard, solvents like hydrophobic 1-butyl-3-methylimidazolium hexafluorophosphate based ionic liquids have been used. The hydrophilicity of the metal ions is a challenge to use this method. Coordinating the metal ions by ligands, lowering the pH of the aqueous phase, modifying the ionic liquid itself in such a way that it can coordinate with the metal ions, employment of large ionic liquid to aqueous phase ratio (minimum of 1:1) were also the attempts made to improve the distribution coefficient of the ionic liquids. All these efforts are problematic in hindering the applications of ionic liquids in extraction. In this report, the extraction efficiencies of ionic liquids ]) from water samples containing Cd 2+ using very small ionic liquid to water ratio (1:6 and 1:12) from a solution of concentrations 0.005 mg/L with out using any coordinating agent as an extractant and the need of changing the pH are disclosed. While ionic liquids to aqueous phase ratio 1:12 demonstrated extraction efficiencies of 75%, 83.75%, 87.50% and 100%, respectively; the 1:6 ratio extracted 87.50%, 100%, 100% and 100%, respectively which shows suitability of the later ratio for better extraction. Moreover, the recyclabilities of [C 6 mim] [PF 6 ] and [C 8 mim] [PF 6 ] was investigated and the result showed that they can be used at least for five cycles. A Linear calibration curve with good coefficient of determination was obtained during the analysis for determination of the metal in the extracts.

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Removal of cadmium (II) from aqueous solutions by two kinds of manganese coagulants

Cited by 9 publications

References 19 publications

A comprehensive review on Cd(II) removal from aqueous solution

A comprehensive review on Cd(II) removal from aqueous solution

Equilibrium and kinetic studies of Cd(II) ion adsorption from aqueous solution by activated red mud

Removal of cadmium ions from aqueous solution using very small ionic liquids to water ratio without metal chelator and pH modifications

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