Removal of cyanide from aqueous solutions by plain and metal-impregnated granular activated carbons

Deveci, Hacı; Yazıcı, Ersin; Alp, İbrahi̇m; Uslu, T.

doi:10.1016/j.minpro.2006.03.002

Cited by 84 publications

(38 citation statements)

References 16 publications

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“…There are several reports on the treatment cyanide compounds by adsorption on plain and metal-impregnated activated carbons [14][15][16][17][18][19]. Huff et al examined the feasibility of removing cyanide from refinery wastewater with powdered activated carbon [14].…”

Section: Background Of These Methodsmentioning

confidence: 99%

Treatment of metal cyanide bearing wastewater by simultaneous adsorption and biodegradation (SAB)

Dash

Balomajumder

Kumar

2008

Journal of Hazardous Materials

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Section: Background Of These Methodsmentioning

confidence: 99%

Treatment of metal cyanide bearing wastewater by simultaneous adsorption and biodegradation (SAB)

Dash

Balomajumder

Kumar

2008

Journal of Hazardous Materials

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“…Activated carbon has a relatively high affinity for many metal-cyanide complexes, including the soluble cyanide complexes of copper, iron, nickel and zinc [41,68,69]. Cyanide is adsorbed at various sites through chelation, ion exchange, solvation and coulombic interactions.…”

Section: Activated Carbonmentioning

confidence: 99%

Review of the Impact on Water Quality and Treatment Options of Cyanide Used in Gold Ore Processing

Nyamunda¹

2017

Water Quality

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Cyanide has been widely used in several industrial applications such as electroplating photography, metal processing, agriculture, food and the production of organic chemicals, plastics, paints and insecticides. The strong affinity of cyanide for metals such as gold and silver makes it suitable for selective leaching of these metals from ores. Cyanide is highly toxic; hence, there is a need to regulate and limit the amount of cyanide that may be discharged into the environment. Technologies focusing on the use of physical, chemical and biological methods have been developed to reduce the concentration of cyanide and cyanide compounds in wastewaters to permissible limits. This chapter reviews the current and emerging technologies for treatment of cyanide from wastewaters generated in gold mining processes.

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“…The results indicate that the adsorption capacity of dextrin decreased with increase adsorbent dosage. This implies that the amount of the number of binding site increased which resulted in a split of the flux of dextrin aqueous solution concentration on the surface area of dextrin [10].This decrease may be described by the electrostatic interaction and interference of binding site which have an influence to reduce adsorbent density [14].…”

Section: Effect Of Adsorbent Dosagementioning

confidence: 99%

Thermodynamic and Equilibrium Studies of Dextrin Adsorption on Modified Coal

Nkechi

Okolie

Okorocha

2016

ILCPA

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Abstract. Dextrin produced from cassava was investigated for adsorption on coal during processing. Aluminium ion (Al 3+ ) and nitrate ion (NO 3 -) were employed for adsorption test to improve coal surfaces. The effect of initial concentration, adsorbent dose and pH on dextrin adsorption onto modified coal surface was investigated. Studies concerning the adsorption equilibrium and thermodynamics were presented; the equilibrium data was modelled using Langmuir and Freundlich isotherms. The adsorption equilibrium data was well explained by Freundlich isotherm. The percentage removal was found to be 93.75% and 90.75% at adsorbent dose of 0.2 g for both aluminium sulphate coal bituminous (ACB) and aluminium sulphate coal lignite (ACL) respectively. There was a rapid increase in adsorption of dextrin from low pH of 2 to about pH of 4 with a plateau region from pH 4 to pH 6. Adsorption capacity of 61.25 mg/g and 55.00 mg/g was achieved at initial concentration of 200 mg/L for ACB and ACL respectively. For a better interpretation, the nature of the adsorption of dextrin on the prepared coal samples was predicted from thermodynamic point of view by estimating the thermodynamic parameters. The determination of basic thermodynamic parameters: enthalpy of adsorption, Gibb's free energy and entropy of adsorption are important. The negative value of ∆G ad indicates the feasibility and spontaneity of the adsorption process and the magnitude is an indication of the involvement of salt link, electrostatic interaction and hydrophobic bonding in the adsorption.

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Removal of cyanide from aqueous solutions by plain and metal-impregnated granular activated carbons

Cited by 84 publications

References 16 publications

Treatment of metal cyanide bearing wastewater by simultaneous adsorption and biodegradation (SAB)

Treatment of metal cyanide bearing wastewater by simultaneous adsorption and biodegradation (SAB)

Review of the Impact on Water Quality and Treatment Options of Cyanide Used in Gold Ore Processing

Thermodynamic and Equilibrium Studies of Dextrin Adsorption on Modified Coal

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