Simultaneous removal of Cd (II) and p-cresol from wastewater by micellar-enhanced ultrafiltration using rhamnolipid: Flux decline, adsorption kinetics and isotherm studies

Verma, Satya Pal; Sarkar, Biswajit

doi:10.1016/j.jenvman.2018.02.069

Cited by 30 publications

(17 citation statements)

References 32 publications

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“…Similar values of Δ G 0 for adsorption of methylene blue and eosin yellow by saponin micelles were reported by previous authors . Also in our previous studies, the Δ G 0 for adsorption of Cd +2 by RHL vesicles was found to be −32.23 kJ/mol, based on Langmuir constant …”

Section: Resultssupporting

confidence: 90%

“…The membrane permeability was determined from the slop of the permeate flux‐transmembrane pressure plot, by measuring pure water permeate flux at different pressure. The schematic diagram of ultrafiltration setup was shown elsewhere . The permeate flux (V w ) was obtained by following equation:

V_{w} = \frac{{normalV}_{normalp}}{A_{m} . Δt},

where V p was the cumulative permeate volume collected in time duration of “Δt,” and “A m ” was an effective area (32.15 cm 2 ) of ultrafiltration membrane.…”

Section: Methodsmentioning

confidence: 99%

“…Very few MEUF studies with biosurfactants have been investigated for separation of organic and inorganic pollutants from aqueous streams . Our previous work has demonstrated the potential of RHL (rhamnolipid) in MEUF for separation of Cd(II) and p‐cresol from aqueous solution . In this study, we report the simultaneous removal of heavy metal ion (Cd +2 ) and organic dye (CV) from aqueous synthetic solution by MEUF with RHL as a glycolipid biosurfactant.…”

Section: Introductionmentioning

confidence: 96%

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Use of rhamnolipid in micellar‐enhanced ultrafiltration for simultaneous removal of Cd⁺² and crystal violet from aqueous solution

Verma

Sarkar

2019

Asia-Pacific J Chem Eng

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The application of rhamnolipid (RHL) in micellar‐enhanced ultrafiltration (MEUF) was investigated to remove both cadmium ion (Cd+2) and crystal violet (CV) simultaneously from aqueous solution. The effects of the membrane pore size, feed conditions, and operating conditions on solute removal efficiency and permeate flux were studied. Response surface methodology (RSM) was used to obtain the optimal feed conditions. Eigenvalue analysis was performed to evaluate the nature of optimal condition. Critical micelle concentration and aggregate size of RHL in the presence of Cd+2 and CV were determined. Ultrafiltration data were used to estimate the partition coefficient, distribution coefficient and relative affinity of the pollutants, and loading capacity of RHL vesicles. Compared with chemical surfactants, the use of RHL in MEUF process with larger membrane pore size performed better in terms of process throughput. About (84 ± 1)% of initial RHL was recovered from retentate stream using acid precipitation technique, at the optimal recovery condition obtained through RSM. The experimental results obtained using optimal feed condition and RHL recovery condition matched well with the predicted results. Reclaimed RHL was successfully used two times in MEUF with rejection efficiency of 96.7% for Cd+2 and 97.8% for CV, thus, significantly lower the cost of the MEUF process.

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Section: Resultssupporting

confidence: 90%

V_{w} = \frac{{normalV}_{normalp}}{A_{m} . Δt},

where V p was the cumulative permeate volume collected in time duration of “Δt,” and “A m ” was an effective area (32.15 cm 2 ) of ultrafiltration membrane.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Use of rhamnolipid in micellar‐enhanced ultrafiltration for simultaneous removal of Cd⁺² and crystal violet from aqueous solution

Verma

Sarkar

2019

Asia-Pacific J Chem Eng

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“…The above can be attributed to the homogeneous distribution of the binding sites in the adsorbents (Tatah et al, 2017). The affinity of the metal for the adsorbent surface in terms of parameter b was low, which implies a low surface energy in the process and, consequently, a weak bond between the metal ions and the adsorbent (indicating a physic-sorption mechanism) that marks the recovery of metal ions through easy desorption, which is an important criterion for selecting an adsorbent (Verma and Sarkar, 2018;Zhou et al, 2017). Based on the Langmuir isotherm, the maximum adsorption capacity (qmax) of Pb (II) was estimated at 37.883 mg / g, which is close to the results obtained using coffee residues (37.037 mg/g) (Alhogbi, 2017), and significantly higher than those obtained with tea residues (21.395 mg/g) (Nikolic et al, 2019).…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Effect of the adsorbent dose in Pb(II) removal by using sugar cane bagasse: Kinetics and isotherms

et al. 2020

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“…Despite demonstrated metal interactions, rhamnolipid-based metal recovery technologies for metalliferous solutions are in the early stages of investigation. Recent reports describe rhamnolipid's use in metal remediation applications for metalliferous solutions: micellar-enhanced ultrafiltration [27,28], precipitate flotation [29], and ion flotation [30]. Building on the last report, the present research was performed to elucidate additional operational limits of ion flotation using monorhamnolipid as a collector.…”

mentioning

confidence: 97%

Ion Flotation of La3+, Cd2+, and Cs+ using Monorhamnolipid Collector

Hogan

Curry

Maier

2018

Colloids and Interfaces

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Water scarcity is a global issue that is expected to continue increasing in importance in the coming decades. Reclaimed water is one important source available to meet future needs. The reclamation process for wastewaters, particularly from industrial sources, involves the need to remove low-level contaminants. Here we report the efficacy of an ion flotation process that uses the biosurfactant monorhamnolipid as a metal collector to recover Cs + , Cd 2+ , and La 3+ from water. These elements were tested at collector-to-colligend ratios of 2, 5, and 10. The collector-to-colligend ratio and metal valence play a large role in determining flotation success with removal efficiencies varying widely. The maximum removal efficiency for the metals when floated individually were 46.2, 99.8, and 98.6% for Cs + , Cd 2+ , and La 3+ , respectively. When mixed together at near equimolar concentrations removal efficiencies were 39.4, 98.4, and 88.1%, respectively. Removal efficiency for Cs + , Cd 2+ , and La 3+ were up to 49.9, 99.5, and 51.5% when mixed at a ratio of 200:10:1, whereas conditional stability constants predict a removal order of La 3+ > Cd 2+ > Cs + . Future research should examine parameters, including pH and ionic strength, that may affect the flotation process as well as actual metal-contaminated waste streams to evaluate the usefulness of this technology.Colloids Interfaces 2018, 2, 43 2 of 15 in wastewater treatment for their ability to remove and concentrate dissolved metal ions from solution: precipitate and ion flotation [10]. The former utilizes chemicals to precipitate dissolved metals and air bubbles to collect the resulting precipitate at the solution surface [10]. The latter concentrates dissolved, surface-inactive ions (colligends) through complexation with surfactants (collectors) and subsequent introduction of air bubbles. The ion-surfactant complexes (sublate) attach to the bubble air/water interfaces and accumulate at the solution surface as foam that can then be collected into a metal concentrate herein called foamate [18]. The solution remaining in the column then has a reduced metal concentration and is ready for additional treatment or release. Since its first description by Sebba [19] in 1959, a large body of research has demonstrated ion flotation's efficacy and optimal operating conditions for a wide variety of collector and colligend pairs (see Pinfold, Matis & Mavros, and Lemlich [15,18,20] for literature reviews). This body demonstrates two important advantages of ion flotation over other treatment approaches: (1) it can achieve high metal removal efficiencies even when metals are very dilute in solution and (2) selective metal recovery is possible by manipulating the collector and other flotation conditions. When developing a flotation process, the collector characteristics of collector-colligend selectivity, critical micelle concentration, solubility, toxicity, and biodegradability should be considered. The latter two points are particularly important because some collector will rema...

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Simultaneous removal of Cd (II) and p-cresol from wastewater by micellar-enhanced ultrafiltration using rhamnolipid: Flux decline, adsorption kinetics and isotherm studies

Cited by 30 publications

References 32 publications

Use of rhamnolipid in micellar‐enhanced ultrafiltration for simultaneous removal of Cd⁺² and crystal violet from aqueous solution

Use of rhamnolipid in micellar‐enhanced ultrafiltration for simultaneous removal of Cd⁺² and crystal violet from aqueous solution

Effect of the adsorbent dose in Pb(II) removal by using sugar cane bagasse: Kinetics and isotherms

Ion Flotation of La3+, Cd2+, and Cs+ using Monorhamnolipid Collector

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Simultaneous removal of Cd (II) and p-cresol from wastewater by micellar-enhanced ultrafiltration using rhamnolipid: Flux decline, adsorption kinetics and isotherm studies

Cited by 30 publications

References 32 publications

Use of rhamnolipid in micellar‐enhanced ultrafiltration for simultaneous removal of Cd+2 and crystal violet from aqueous solution

Use of rhamnolipid in micellar‐enhanced ultrafiltration for simultaneous removal of Cd+2 and crystal violet from aqueous solution

Effect of the adsorbent dose in Pb(II) removal by using sugar cane bagasse: Kinetics and isotherms

Ion Flotation of La3+, Cd2+, and Cs+ using Monorhamnolipid Collector

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Use of rhamnolipid in micellar‐enhanced ultrafiltration for simultaneous removal of Cd⁺² and crystal violet from aqueous solution

Use of rhamnolipid in micellar‐enhanced ultrafiltration for simultaneous removal of Cd⁺² and crystal violet from aqueous solution