Adsorption of microamounts of silver on manganese dioxide from acid solutions

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Separation Science and Technology; (USA)

DOI:https://doi.org/10.1080/01496398908050657· OSTI ID:6011835

Hasany, S M; Habib-Ur-Rehman,; Rashid, A ^[1]

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1. Pakistan Institute of Nuclear Science and Technology, Islamabad (Pakistan)

Adsorption of microamounts of silver on manganese dioxide from nitric and perchloric acid solutions has been studied and optimized with respect to shaking time, concentrations of electrolyte, adsorbent, and adsorbate. Maximum adsorption (> 99.5%) has been achieved from 0.01 mol/dm{sup 3} acid solution using 50 mg oxide at 10{sup {minus}5} mol/dm{sup 3} silver concentration after 30 min shaking. The adsorption decreases with increasing concentration of acid and adsorbate from both the acids. The presence of a 10{sup 4}-fold greater concentration of cyanide, thiocyanate, thiosulfate, and Pb(II) than silver reduces the adsorption drastically. The adsorption of silver follows the Freundlich adsorption isotherm over the entire concentration range investigated from 9.27 {times} 10{sup {minus}6} to 2.92 {times} 10{sup {minus}3} mol/dm{sup 3} with a value of A = 49 mmol/g and 1/n = 0.93. Moreover, the Langmuir adsorption isotherm is also valid except at the lowest and highest concentrations.

• OSTI ID: 6011835
• Journal Information: Separation Science and Technology; (USA), Vol. 24:15; ISSN 0149-6395
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
SILVER
ADSORPTION
ADSORPTION ISOTHERMS
EXPERIMENTAL DATA
MANGANESE OXIDES
MICROANALYSIS
NITRIC ACID
PERCHLORIC ACID
PH VALUE
CHALCOGENIDES
DATA
ELEMENTS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
ISOTHERMS
MANGANESE COMPOUNDS
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SORPTION
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400102* - Chemical & Spectral Procedures