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

Purkayastha, Debasree; Mishra, Umesh; Biswas, Swarup

doi:10.1016/j.jwpe.2014.05.009

“…Pre-aeration for 5mins before sedimentation helps in removal of entrained particles and improves flocculation. Various studies have been done to determine the effect of pH, turbidity and quantity of coagulants on removals of impurities by this process [2,3].…”

Section: Coagulation/ Flocculationmentioning

confidence: 99%

A Review on Removal of Heavy Metal Ions from Waste Water using Natural/ Modified Bentonite

Prabhu

¹

,

Prabhu

²

2018

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Abstract. The pollution of water due to various toxic components especially heavy metals are causing an adverse effect on the flora and fauna and also have a potential effect on the human well-being. Due to this there is an immediate requirement to find various techniques for the removal of lethal toxins in wastewater. Amongst all of the existing methods, adsorption is one of the most effective and efficient technique for the elimination of contaminants such as heavy metals from wastewater. The increasing number of research publications on adsorption of heavy metals using modified bentonite leads to the fact that there has been a surging importance in the production of a variety of economical adsorbents for water treatment. Outcome from the latest advances in using bentonites and modified bentonite shows the adaptable nature of the clay and its environment friendly nature. The present review shows the removal of heavy metals using modified bentonite. The main purpose of this review is to describe the flexible way of natural bentonite and modified bentonite and its ability to absorb array of inorganic pollutants, which are present in the waste water. It is apparent from the review that modified bentonite have displayed high removal potential for certain kind of inorganic contaminants from wastewater.

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“…They are commercially available in hollow fiber, tubular plate and frame and spiral wound configurations. The typical feed pressure is 4-100 psig [2,3].…”

Section: Ultrafiltrationmentioning

confidence: 99%

“…This process finds application in various industrial applications such as removal of heavy metals or organics from industrial waste water from industries such as textile industry, pulp and paper industry, electroplating industry, fertilizer industry, leather tanning industry, rubber industry, detergent industry etc. [2,3].…”

Section: Reverse Osmosismentioning

confidence: 99%

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A Review on Removal of Heavy Metal Ions from Waste Water using Natural/ Modified Bentonite

Prabhu

¹

,

Prabhu

²

2018

View full text Add to dashboard Cite

Abstract. The pollution of water due to various toxic components especially heavy metals are causing an adverse effect on the flora and fauna and also have a potential effect on the human well-being. Due to this there is an immediate requirement to find various techniques for the removal of lethal toxins in wastewater. Amongst all of the existing methods, adsorption is one of the most effective and efficient technique for the elimination of contaminants such as heavy metals from wastewater. The increasing number of research publications on adsorption of heavy metals using modified bentonite leads to the fact that there has been a surging importance in the production of a variety of economical adsorbents for water treatment. Outcome from the latest advances in using bentonites and modified bentonite shows the adaptable nature of the clay and its environment friendly nature. The present review shows the removal of heavy metals using modified bentonite. The main purpose of this review is to describe the flexible way of natural bentonite and modified bentonite and its ability to absorb array of inorganic pollutants, which are present in the waste water. It is apparent from the review that modified bentonite have displayed high removal potential for certain kind of inorganic contaminants from wastewater.

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“…The most widely used techniques for removing metal ions from wastewater include chemical precipitation, ion exchange, reverse osmosis and solvent extraction and adsorption [2][3][4][5][6][7][8][9][10][11][12][13][14]. Several studies have reported that significant amounts of heavy metals are removed from solution by adsorption on fly ash [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

A Case Study of Landfill Leachate Using Coal Bottom Ash for the Removal of Cd2+, Zn2+ and Ni2+

Ayala

¹

,

Fernández

²

2016

Metals

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Abstract:The removal of Cd 2+ , Zn 2+ and Ni 2+ by coal bottom ash has been investigated. In single metal system, metal uptake was studied in batch adsorption experiments as a function of pH (2-3), contact time (5-180 min), initial metal concentration (50-400 mg/L), adsorbent concentration (5-40 g/L), particle size, and ionic strength (0-1 M NaCl). Removal percentages of metals ions increased with increasing pH and dosage. Removal efficiency at lower concentrations was greater than at higher values. The maximum amount of metal ion adsorbed in milligrams per gram was 35.4, 35.1 and 34.6 mg/g for Zn 2+ , Cd 2+ and Ni 2+ , respectively, starting out from an initial solution at pH 3. Simultaneous removal of Zn 2+ , Cd 2+ and Ni 2+ ions from ternary systems was also investigated and compared with that from single systems. Cd 2+ uptake was significantly affected by the presence of competing ions at pH 2. The results obtained in the tests with landfill leachate showed that bottom ash is effective in simultaneously removing several heavy metals such as Ni, Zn, Cd, As, Mn, Cu, Co, Se, Hg, Ag, and Pb.

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

Cited by 156 publications

References 185 publications

A Review on Removal of Heavy Metal Ions from Waste Water using Natural/ Modified Bentonite

A Review on Removal of Heavy Metal Ions from Waste Water using Natural/ Modified Bentonite

A Review on Removal of Heavy Metal Ions from Waste Water using Natural/ Modified Bentonite

A Case Study of Landfill Leachate Using Coal Bottom Ash for the Removal of Cd2+, Zn2+ and Ni2+

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