Removal of trace Cd2+ using continuous multistage ion foam fractionation: Part I—The effect of feed SDS/Cd molar ratio

Rujirawanich, Visarut; Chavadej, Sumaeth; O’Haver, John H.; Rujiravanit, Ratana

doi:10.1016/j.jhazmat.2010.06.111

Cited by 45 publications

(20 citation statements)

References 25 publications

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“…Cd 2 þ concentration is decreased to 0.0015 mg L À 1 , which is far lower than the drinking water quality standards (0.005 mg L À 1 ) set by WHO [32]. However, most reports basically have been focused on the removal of high concentration Cd 2 þ from water and the final Cd 2 þ concentration is still higher than 0.06 mg L À 1 after treatment [33][34][35][36]. Furthermore, we also study the adsorption dynamics of the mesoporous TiN microspheres, as shown in Fig.…”

Section: þ Removal Testmentioning

confidence: 89%

Facile preparation of mesoporous titanium nitride microspheres as novel adsorbent for trace Cd2+ removal from aqueous solution

Sun

Zhang

et al. 2015

Journal of Physics and Chemistry of Solids

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Section: þ Removal Testmentioning

confidence: 89%

Facile preparation of mesoporous titanium nitride microspheres as novel adsorbent for trace Cd2+ removal from aqueous solution

Sun

Zhang

et al. 2015

Journal of Physics and Chemistry of Solids

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“…The concentration of Cd ions was determined by an atomic adsorption spectrophotometer (AAS, Varian, SpectrAA 300) at a recommended wave length of 228.8 nm. The procedure for determining Cd concentration was carried out with consideration of the effect of SDS interference, referring to the procedure reported in literature (14) and Part I of this work (4). A cadmium standard solution containing SDS at the same concentration as in the diluted sample was used for obtaining a calibration curve.…”

Section: Methodsmentioning

confidence: 99%

“…In this work, we extend the application of continuous multistage foam fractionation with bubble-cap trays for the removal of trace heavy metals at low concentrations. The effect of feed SDS=Cd molar ratio was discussed in Part I of this work (4). The purpose of Part II of this present work was to evaluate the effects of air flow rate, foam height, feed flow rate, and feed Cd concentration on Cd removal at low feed Cd concentrations.…”

Section: Introductionmentioning

confidence: 93%

“…The bulk liquid transport can increase the amount of a component found in the foam phase only when the concentration of the unadsorbed molecules in the bulk liquid and the volumetric flow rate of foam are significantly large. However, in general, the bulk liquid transport also carries the liquid to the foam phase, reducing both the enrichment ratio (concentration in foamate=concentration in feed) and the separation factor (concentration in foamate=concentration in effluent) in contrast to the adsorptive transport (4).…”

Section: Introductionmentioning

confidence: 99%

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Removal of Trace Cd²⁺Using Continuous Multistage Ion Foam Fractionation: Part II—The Effects of Operational Parameters

Rujirawanich¹,

Chavadej²,

O’Haver³

et al. 2011

Separation Science and Technology

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A multistage ion foam fractionation column with bubble-cap trays was employed to study the removal of cadmium ions from simulated wastewater having low Cd concentrations (10-30 mg/L), examining the effects of foam height, air flow rate, feed flow rate, and feed Cd concentration. Sodium dodecyl sulfate (SDS) was used to generate foam in this study. An increase in foam height, which reduces liquid hold-up in the generated foam, resulted in the enhancement of the enrichment ratios of both SDS and Cd while the removal and residual factor of Cd showed insignificant change. An increase in air flow rate increased the foam generation rate, foamate volumetric ratio, and the removal efficiency of Cd but decreased the enrichment ratios of both Cd and SDS. The separation factors of both Cd and SDS decreased with increasing feed flow rate, which is mainly attributable to both the effects of the enhancement of foamate volumetric ratio and the increases in both SDS and Cd input rates. An increase in feed Cd concentration was found to increase Cd effluent concentration and SDS removal but to decrease the enrichment ratios of both Cd and SDS because of the increasing liquid entrainment in the produced foam.

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“…Examples include food, cosmetics, cleaning, surface treatment, building materials, reducing pollution (e.g., wastewater treatment [1] and heavy metal removal [2] by foam fractionation) and the extraction of natural resources, e.g., froth flotation [3]. Foamability and foam stability are two of the most common types of foam properties.…”

Section: Introductionmentioning

confidence: 99%

Foamability of sodium dodecyl sulfate solutions: Anomalous effect of dodecanol unexplained by conventional theories

Wang

Nguyen

Farrokhpay

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. • Antifoam efficacy of DOH and decreased bubble surface potential explain the decreased foamability of pre-CMC SDS-DOH solutions.• Complex effect of surfactant mixtures on foamability is demonstrated.4 AbstractConventional theories indicate that surfactant solutions with low surface tension, fast adsorption kinetics, and high interfacial viscoelasticity increase foamability. These theories are applicable to single surfactants of pre-CMC. Here, we examine whether these theories are applicable for surfactant mixtures. Specifically, we investigated the foamability of sodium dodecyl sulfate (SDS)-dodecanol (DOH) solutions. We found that the foamability of SDS-DOH solutions exhibited 'anomalies' that were unexplained by conventional theories. The remarkable decrease in the foamability of SDS solutions caused by the addition of DOH could not be easily explained by the theories of surface tension and surface viscoelasticity.Instead, we proposed alternative mechanisms to resolve these unexpected results. Below the DOH solubility limit, the replacement of SDS molecules by DOH molecules at the air-water interface results in a reduced surface potential, leading to a lower foamability. The antifoam effects of DOH droplets can account for the reduced foamability above this limit. This paper highlights the complex effect of surfactant mixtures on foamability.

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Removal of trace Cd2+ using continuous multistage ion foam fractionation: Part I—The effect of feed SDS/Cd molar ratio

Cited by 45 publications

References 25 publications

Facile preparation of mesoporous titanium nitride microspheres as novel adsorbent for trace Cd2+ removal from aqueous solution

Facile preparation of mesoporous titanium nitride microspheres as novel adsorbent for trace Cd2+ removal from aqueous solution

Removal of Trace Cd²⁺Using Continuous Multistage Ion Foam Fractionation: Part II—The Effects of Operational Parameters

Foamability of sodium dodecyl sulfate solutions: Anomalous effect of dodecanol unexplained by conventional theories

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Removal of trace Cd2+ using continuous multistage ion foam fractionation: Part I—The effect of feed SDS/Cd molar ratio

Cited by 45 publications

References 25 publications

Facile preparation of mesoporous titanium nitride microspheres as novel adsorbent for trace Cd2+ removal from aqueous solution

Facile preparation of mesoporous titanium nitride microspheres as novel adsorbent for trace Cd2+ removal from aqueous solution

Removal of Trace Cd2+Using Continuous Multistage Ion Foam Fractionation: Part II—The Effects of Operational Parameters

Foamability of sodium dodecyl sulfate solutions: Anomalous effect of dodecanol unexplained by conventional theories

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Removal of Trace Cd²⁺Using Continuous Multistage Ion Foam Fractionation: Part II—The Effects of Operational Parameters