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Title: Removal of cadmium from aqueous solution using adsorptive bubble separation techniques

Abstract

Cadmium ion was removed from aqueous solutions using adsorptive bubble separation techniques. The effect of pH, coagulant and activator concentrations and ionic strength on separation efficiency was studied. Adsorbing colloid flotation using ferric hydroxide and aluminum hydroxide as the coprecipitant and sodium lauryl sulfate as the collector and frother was found to be very effective provided that the ionic strength of the solution was no greater than 0.01 M. The residual cadmium concentration was less than 0.02 ppm after foaming for 10 min from a solution containing 20 ppm cadmium initially. Effective separation can be achieved from solutions containing 0.1 M NaNO/sub 3/ or 0.05 M Na/sub 2/SO/sub 4/ when zinc ion is used as the activator. The results of foam flotation were compared with the zeta potential of the floc. It was found that the zeta potential of the floc decreases with increasing ionic strength of the solution. The zeta potential of the floc is more positive when activators (aluminum and zinc ions) were added, which presumably gives the floc a stronger affinity for anionic surfactant adsorption, resulting in better separation efficiency. Adsorbing colloid flotation becomes less effective with increasing inert salt concentration of the solution; this effect canmore » be compensated for to quite a large extent with the aid of activators, and the applicability of foam separation techniques for heavy metal removal from wastewater is thus greatly extended.« less

Authors:
;
Publication Date:
Research Org.:
National Tsing Hua Univ., Hsinchu (Taiwan)
OSTI Identifier:
5995456
Resource Type:
Journal Article
Journal Name:
Sep. Sci. Technol.; (United States)
Additional Journal Information:
Journal Volume: 23:10-11
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 54 ENVIRONMENTAL SCIENCES; CADMIUM; ADSORPTION; AQUEOUS SOLUTIONS; BUBBLES; COLLOIDS; EFFICIENCY; EXPERIMENTAL DATA; PH VALUE; QUANTITY RATIO; DATA; DISPERSIONS; ELEMENTS; INFORMATION; METALS; MIXTURES; NUMERICAL DATA; SOLUTIONS; SORPTION; 400105* - Separation Procedures; 520200 - Environment, Aquatic- Chemicals Monitoring & Transport- (-1989)

Citation Formats

Huang, S D, and Wang, T F. Removal of cadmium from aqueous solution using adsorptive bubble separation techniques. United States: N. p., 1988. Web. doi:10.1080/01496398808058440.
Huang, S D, & Wang, T F. Removal of cadmium from aqueous solution using adsorptive bubble separation techniques. United States. doi:10.1080/01496398808058440.
Huang, S D, and Wang, T F. Mon . "Removal of cadmium from aqueous solution using adsorptive bubble separation techniques". United States. doi:10.1080/01496398808058440.
@article{osti_5995456,
title = {Removal of cadmium from aqueous solution using adsorptive bubble separation techniques},
author = {Huang, S D and Wang, T F},
abstractNote = {Cadmium ion was removed from aqueous solutions using adsorptive bubble separation techniques. The effect of pH, coagulant and activator concentrations and ionic strength on separation efficiency was studied. Adsorbing colloid flotation using ferric hydroxide and aluminum hydroxide as the coprecipitant and sodium lauryl sulfate as the collector and frother was found to be very effective provided that the ionic strength of the solution was no greater than 0.01 M. The residual cadmium concentration was less than 0.02 ppm after foaming for 10 min from a solution containing 20 ppm cadmium initially. Effective separation can be achieved from solutions containing 0.1 M NaNO/sub 3/ or 0.05 M Na/sub 2/SO/sub 4/ when zinc ion is used as the activator. The results of foam flotation were compared with the zeta potential of the floc. It was found that the zeta potential of the floc decreases with increasing ionic strength of the solution. The zeta potential of the floc is more positive when activators (aluminum and zinc ions) were added, which presumably gives the floc a stronger affinity for anionic surfactant adsorption, resulting in better separation efficiency. Adsorbing colloid flotation becomes less effective with increasing inert salt concentration of the solution; this effect can be compensated for to quite a large extent with the aid of activators, and the applicability of foam separation techniques for heavy metal removal from wastewater is thus greatly extended.},
doi = {10.1080/01496398808058440},
journal = {Sep. Sci. Technol.; (United States)},
number = ,
volume = 23:10-11,
place = {United States},
year = {1988},
month = {8}
}