Removal of metallic ions at the parts per billion level from aqueous solutions using the polymer-surfactant aggregate process

Shen, Liang-Chi; Hankins, Nicholas P.

doi:10.1016/j.jwpe.2017.09.001

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…Ionic flotation can be used both for the treatment of wastewater and for the recovery of precious or rare metal ions. As surfactants/collectors were studied sodium dodecyl sulfate [42], polyethylenimine [43], hexadecyltrimethyl ammonium bromide [44], 4-thiazolidinone derivatives [45], etc. This treatment method does not require high energy consumption and sophisticated and large equipment, it is easy to operate, and can be used for selective separations presenting high efficiency and obtaining low amounts of sludge.…”

Section: Ion-flotationmentioning

confidence: 99%

Heavy Metals Removal from Water and Wastewater

Lupa¹,

Cocheci²

2023

Heavy Metals - Recent Advances

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The chapter summarizes the main treatment processes used for the removal of heavy metals from water and wastewater. Heavy metals present a recalcitrant and persistent character, a bioaccumulating ability in the environment, therefore their removal from water and wastewater represents a worldwide concern. This chapter reviews the recent advances and technical applicability of the methods that have been used to treat heavy metal-containing water. The discussed technologies include chemical precipitation, coagulation-flocculation, flotation, ion exchange, adsorption, membrane filtration, and electrochemical methods. The main advantages/disadvantages and limits of each method are evaluated. It was observed that even if are made a lot of research on each mentioned method in practice is still necessary for intensive work for each case. In all methods, there are things that could be improved; therefore, future studies must be focused on the development of cost-effective materials and methods that involve low treatment costs, high efficiency, and minimal impact on the environment.

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Section: Ion-flotationmentioning

confidence: 99%

Heavy Metals Removal from Water and Wastewater

Lupa¹,

Cocheci²

2023

Heavy Metals - Recent Advances

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“…Several approaches have been investigated to resolve this issue, including applying mixed surfactants to decrease the CMC [118], utilizing adsorption methods on the permeate to remove the surfactant in the permeate [119], synthesizing cross-linked micelles [116], and using surfactant and polymer mixture, which forms colloidal aggregates [120]. A list of suggested improvements of MEUF is shown in Table 5.…”

Section: Suggested Improvements In Meufmentioning

confidence: 99%

Inorganic anion removal using micellar enhanced ultrafiltration (MEUF), modeling anion distribution and suggested improvements of MEUF: A review

Chen

Jafvert

et al. 2020

Chemical Engineering Journal

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Surfactants have been used often in environmental remediation strategies due to their special amphiphilic nature which alters surface and water interfacial properties. When the aqueous concentration of a cationic surfactant far exceeds the critical micelle concentration (CMC), a large concentration of cationic micelles will form in water. These micelles each consist of tens to hundreds of surfactant monomers, and collectively can be utilized as nano-sized ion exchangers to assist with ultrafiltration separation (i.e., removal) of anionic pollutants from natural waters or wastewaters. Target anionic pollutants include nitrate, phosphate, arsenate and chromate. However, most polluted waters contain a complex mixture of anions, with these different anions competing for the micellar pseudo-phase, thus potentially reducing the overall removal efficiency of the target anions.Further, loss of surfactant monomers through the membrane also reduces process efficiency as replenishment of surfactant over time is required. In this review, the existing research on inorganic anion removal by micellar enhanced ultrafiltration (MEUF) and similar processes

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“…In previous studies, branched polyethylenimine (PEI) and sodium dodecyl sulphate (SDS) were used to form PSAs to remove and recover metals from metallic effluents. Shen et al [14,16] reported that up to 99% of Cd 2+ , Zn 2+ , and Cr 3+ ions were removed at ppm contamination levels under optimum dosages of PSAs in the presence of inorganic and organic contaminants. Furthermore, 97% of Cd 2+ was removed at ppb contamination levels.…”

Section: Introductionmentioning

confidence: 99%

“…In previous studies, PEI has been used as the cationic polymer to form PSAs [14][15][16]. As is known, PEI, with repeated amino groups, presents as a positively charged polyelectrolyte in an acidic environment, while it presents as a neutral polyelectrolyte at high pH; consequently, its interactions with surfactants or with metals can vary depending on the pH.…”

Section: Introductionmentioning

confidence: 99%