Removal behaviour of a thiazine, an azo and a triarylmethane dyes from polluted kaolinitic soil using electrokinetic remediation technology

Yusni, Effendi Mohd; Tanaka, Shunitz

doi:10.1016/j.electacta.2015.06.153

Cited by 24 publications

(6 citation statements)

References 30 publications

(25 reference statements)

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“…Electrokinetic extraction (EKE) is one of the emerging separation technique for extraction of inorganic and organic pollutants from soil samples using an electric field (Ahmed et al, ; Khajeh, Pedersen‐Bjergaard, Barkhordar, & Bohlooli, ; Khajeh et al, ; Peng et al, ; Yusni & Tanaka, ). It uses a voltage gradient for charged molecules in order to remove them from contaminants.…”

Section: Introductionmentioning

confidence: 99%

Extraction of caffeine and gallic acid from coffee by electrokinetic methods coupled with a hollow‐fiber membrane

Khajeh

Fard

Bohlooli

et al. 2017

J Food Process Engineering

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In this study the hollow fiber membrane coupled with electrokinetics was used, for the first time, for extraction and determination of caffeine and gallic acid from coffee prior to high performance liquid chromatography with photodiode array detection. Gallic acid (as an acid) and caffeine (as a base) were extracted from coffee at pH 5. In this work, several variables including applied voltage, coffee pH, acceptor phase pH, and extraction time were investigated. Our results showed that the extraction efficiency was increased when the applied voltage and extraction time were increased. The optimum conditions were pH 5 for the coffee, applied voltage of 20 V, and extraction time of 5 h. Gallic acid as an acid and caffeine as a base migrated to anode and cathode, respectively. Under the optimum conditions, gallic acid and caffeine were extracted with extraction efficiency of 21.3 and 23.4%, respectively. The intra‐day and inter‐day precisions (%) were found to be 7.6 and 4.8%, respectively. Therefore, this set‐up for electrokinetics was potentially considered as a selective and simple preparation method for simultaneous extraction and analysis of basic and acid compounds in various matrices. Practical applications This study would benefit for extraction and separation of caffeine and gallic acid from coffee and other naturel samples. In this procedure, the new set‐up for EKE based on two hollow fibers were employed for simultaneous removal of basic and acidic compounds. The EKE is used for extraction of organic compounds from food/soils with low permeability. The practical applications of this procedure have become extensive in a variety of fields, including electrokinetic waste remediation, biomaterials, radionuclides, and organic materials.

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Section: Introductionmentioning

confidence: 99%

Extraction of caffeine and gallic acid from coffee by electrokinetic methods coupled with a hollow‐fiber membrane

Khajeh

Fard

Bohlooli

et al. 2017

J Food Process Engineering

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“…Aromatic azo compounds are important chemical products that have been widely applied in industrial production and everyday household items, but they lead to environmental pollution due to their biorecalcitrance, color, and potential toxicity to mankind and wildlife [37][38][39][40]. The physical and chemical methods for decomposition of aromatic azo compounds have several shortcomings, such as high cost and the generation of toxic substances and voluminous sludge [41,42]. Therefore, it is necessary to devise and study new synthetic methods that meet the new requirements, especially environmentally benign methods.…”

Section: Introductionmentioning

confidence: 99%

New Insight into the Synthesis of Aromatic Azo Compounds Assisted by Surface Plasmon Resonance

Wang

Song

et al. 2016

Plasmonics

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The application of surface plasmon resonance (SPR)-assisted catalysis to synthesize aromatic azo compounds was first reported in 2010. The feasibility of SPRassisted catalytic decomposition of aromatic azo compounds has also been confirmed, both experimentally and theoretically. Compared with traditional chemical synthesis methods, SPR-assisted catalysis has many advantages, such as high efficiency, low energy consumption, and high selectivity. The synthetic route to aromatic azo compounds and the kinetics thereof can be efficiently monitored by Raman spectroscopy. In this way, it has been confirmed that SPR-assisted catalysis occurs on the surface of noble metal nanoparticles (NPs). Mechanistically, the process involves transfer of electrons excited by the incident laser from noble metal NPs to 3 O 2 in air to form 2 O 2 − for the generation of SPR on the surface of the noble metal nanoparticles. The 2 O 2 − can then react with the metal to form metal oxides or hydroxides, which in turn can react with the substrate molecule. The substrate molecule can gain a proton from a proton donor or lose a proton to form a radical, which can react further. This mechanism accounts for the conversion of 4-aminothiophenol (PATP) into 4, 4-dimercaptoazobenzene (DMAB). The metal oxide or hydroxide formed reacts with PATP in an acid-base neutralization process. PATP radicals (PATP · ) are formed by the loss of a proton, and pairing of two PATP · leads to the intermediate product DMHAB. Deprotonation DMHAB then gives the final product DMAB.

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“…1). Electrokinetic extraction has been applied to soil to remove various pollutants, such as heavy metals (Jensen et al, 2007) and various neutral, cationic, and anionic organic contaminants (Guedes et al, 2014;López-Vizcaíno et al, 2017a;Yusni and Tanaka, 2015) (see Table S1 in Supporting Information (SI)). However, to our knowledge, the technology has not previously been evaluated for PFASs.…”

Section: Introductionmentioning

confidence: 99%

Electrodialytic per- and polyfluoroalkyl substances (PFASs) removal mechanism for contaminated soil

et al. 2019

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Contamination of soils with per-and polyfluoroalkyl substances (PFASs) is a global problem, in particular at fire-fighter training sites due to the usage of PFAS-containing aqueous fire-fighting foams (AFFFs). In this study, an electrodialytic remediation method was applied for the first time to remove PFASs from contaminated soil. The electrodialytic remediation system was evaluated in a laboratoryscale experiment with current densities of 0.19 mA cm -2 and 0.38 mA cm -2 over 21 days, using PFAScontaminated soil from a fire-fighter training site at Stockholm Arlanda Airport, Sweden. Of the 23 PFASs targeted, significant (p<0.05) PFAS electromigration towards the anode was observed for C3-C7 perfluoroalkyl carboxylates (PFCAs) (PFBA, PFPeA, PFHxA, PFOA) and C4, C6, and C8 perfluoroalkane sulfonates (PFSAs) (PFBS, PFHxS, PFOS) since these PFASs were predominantly negatively charged. In contrast to the electromigration of the charged PFASs, N-methyl perfluorooctane sulfonamide (MeFOSA), perfluorooctane sulfonamidoacetic acid (FOSAA) and ethyl FOSAA (EtFOSAA) showed significant (p<0.05) transport towards the cathode, which is probably attributed due to electro-osmotic flow of these predominantly neutral PFASs. Mass balance calculations showed that for the shortestchained PFASs (i.e., PFBA, PFPeA, PFHxA, PFBS, and PFHxS), up to 20% was extracted from the soil to the anolyte, which showed that electrodialytic is a possible in-situ remediation technique for PFAScontaminated soil.

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Removal behaviour of a thiazine, an azo and a triarylmethane dyes from polluted kaolinitic soil using electrokinetic remediation technology

Cited by 24 publications

References 30 publications

Extraction of caffeine and gallic acid from coffee by electrokinetic methods coupled with a hollow‐fiber membrane

Extraction of caffeine and gallic acid from coffee by electrokinetic methods coupled with a hollow‐fiber membrane

New Insight into the Synthesis of Aromatic Azo Compounds Assisted by Surface Plasmon Resonance

Electrodialytic per- and polyfluoroalkyl substances (PFASs) removal mechanism for contaminated soil

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