Degradation of industrial surfactants by photocatalysis combined with ozonation

Zsilák, Zoltán; Fónagy, Orsolya; Szabó-Bárdos, Erzsébet; Horváth, Ottó; Horváth, Krisztián; Hajós, Péter

doi:10.1007/s11356-014-2527-2

Cited by 14 publications

(8 citation statements)

References 36 publications

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“…The combination with photocatalysis led to the same mineralization efficiency (54%), as in the case of the air/UV/TiO 2 system, and to an initial rate (1.44 mg·dm −3 ·min −1 ), which is just slightly lower than the corresponding value measured without ozonation. These data suggest that ozonation, deviating from our observations regarding ionic surfactants [ 30 , 31 ], does not increase the efficiency of the photocatalytic mineralization of Triton X-100. However, contrary to persulfate, O 3 does not show any significant hindering effect either, probably because it cannot occupy the active sites on the surface of the catalyst.…”

Section: Resultssupporting

confidence: 79%

“…Our current investigations indicated TiO 2 -mediated photocatalysis to be successfully applicable to the mineralization of various ionic detergents [ 26 , 27 , 28 ] and amino acids [ 29 ]; besides, its combination with ozonation resulted in a synergistic effect [ 30 , 31 ]. On the basis of the earlier, partly inconsistent observations, our present paper deals with the oxidation and mineralization of Triton X-100 under various circumstances, focusing on the heterogeneous photocatalysis, in order to get more insight into the degradation mechanism.…”

Section: Introductionmentioning

confidence: 99%

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TiO2-Mediated Photocatalytic Mineralization of a Non-Ionic Detergent: Comparison and Combination with Other Advanced Oxidation Procedures

et al. 2015

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Triton X-100 is one of the most widely-applied man-made non-ionic surfactants. This detergent can hardly be degraded by biological treatment. Hence, a more efficient degradation method is indispensable for the total mineralization of this pollutant. Application of heterogeneous photocatalysis based on a TiO2 suspension is a possible solution. Its efficiency may be improved by the addition of various reagents. We have thoroughly examined the photocatalytic degradation of Triton X-100 under various circumstances. For comparison, the efficiencies of ozonation and treatment with peroxydisulfate were also determined under the same conditions. Besides, the combination of these advanced oxidation procedures (AOPs) were also studied. The mineralization of this surfactant was monitored by following the TOC and pH values, as well as the absorption and emission spectra of the reaction mixture. An ultra-high-performance liquid chromatography (UHPLC) method was developed and optimized for monitoring the degradation of Triton X-100. Intermediates were also detected by GC-MS analysis and followed during the photocatalysis, contributing to the elucidation of the degradation mechanism. This non-ionic surfactant could be efficiently degraded by TiO2-mediated heterogeneous photocatalysis. However, surprisingly, its combination with the AOPs applied in this study did not enhance the rate of the mineralization. Moreover, the presence of persulfate hindered the photocatalytic degradation.

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Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

TiO2-Mediated Photocatalytic Mineralization of a Non-Ionic Detergent: Comparison and Combination with Other Advanced Oxidation Procedures

et al. 2015

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“…Currently, there are a few techniques to remove surfactant from wastewater, which include biosorption [5], biodegradation [3], oxidation [6], adsorption [7], ultra-filtration, and ion-exchange [8]. Among these techniques, the adsorption method is easy to implement and low in cost while some of the adsorbents can be reused.…”

Section: -2506mentioning

confidence: 99%

Preparation of Date Seed Activation for Surfactant Recovery

Jamion¹,

Haziqah²,

Huda³

et al. 2017

MJAS

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Surfactants also known as surface-active agents are one of the water pollutants that can lead to the deterioration of the environment. In this study, activated carbon was prepared from date seeds (DAC) by using phosphoric acid as an activating agent. The activation process was carried out at 500 °C for two hours. DAC was characterized by Fourier-Transformed Infrared Spectrometer (FTIR), Field Emission Scanning Electron Microscopy (FESEM), Energy-Dispersive X-Ray Spectroscopy (EDX) and Nitrogen Adsorption at 77 K. The BET surface area of DAC was 1187 m 2 /g. The adsorption capacities of surfactants (CTAB and TX-100) were determined. This study showed that the adsorption capacity of CTAB (23.0724 mg/g) onto DAC was greater than TX-100 (11.3868 mg/g). The adsorption process between both surfactants onto DAC was done by physisorption through electrostatic forces. Thus, this study showed that the date seeds have a greater tendency to be microporous activated carbon and an adsorbent for surfactants recovery.Keywords: activated carbon, phosphoric acid, date seed Abstrak Bahan aktif permukaan juga dikenali sebagai surfaktan adalah salah satu bahan pencemar air yang boleh membawa kepada kemerosotan alam sekitar. Dalam kajian ini, karbon teraktif telah disediakan daripada biji kurma (DAC) dengan menggunakan asid fosforik sebagai ejen pengaktifan. Proses pengaktifan telah dilakukan pada suhu 500 °C selama dua jam. Karbon teraktif (DAC) telah dicirikan oleh Spektroskopi Inframerah Transformasi Fourier (FTIR), Mikroskopi Medan Pancaran Imbasan Elektron (FESEM), Sebaran Tenaga Sinar-X (EDX) dan penjerapan gas nitrogen pada suhu 77 K. Luas permukaan BET kawasan DAC adalah 1187 m 2 /g. Kapasiti penjerapan surfaktan (CTAB dan TX-100) telah dikaji. Kajian ini menunjukkan bahawa kapasiti penjerapan CTAB (23.0724 mg/g) pada DAC adalah lebih tinggi daripada TX-100 (11.3868 mg/g). Proses penjerapan antara bagi kedua-dua surfaktan DAC adalah secara penjerapan fizikal melalui daya elektrostatik. Oleh itu, kajian ini menunjukkan bahawa biji kurma mempunyai kecenderungan yang lebih besar sebagai karbon teraktif berliang mikro dan bahan penjerap yang baik untuk pemulihan surfaktan.

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“…On the basis of the characteristic molar absorbances of 4hydroxybenzenesulfonic acid (4-HBS) (λ max =277 nm, ε=868 M -1 cm -1 ) and 2,5-dihydroxybenzenesulfonic acid (λ max =302 nm, ε=3300 M -1 cm -1 ) as commercially available standards, the appearance of a shoulder at 280-300 nm suggests the formation of hydroxylated intermediates. The results indicate that the initial step of the degradation is hydroxylation of the starting surfactant, resulting in the production of hydroxy-and dihydroxybenzenesulfonates [5][6][7]. Therefore, liquid chromatography-mass spectrometry analysis was utilized for the detection of intermediates.…”

Section: Photodegradation Of Model Compoundsmentioning

confidence: 99%

Improvement Possibilities of Heterogeneous Photocatalysis with the Aim of In-Field Use

Fónagy¹,

Hegedűs²,

Szabó-Bárdos³

et al. 2017

Hungarian Journal of Industry and Chemistry

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Heterogeneous photocatalysis can be successfully applied for the degradation of organic pollutants, although the efficiency of this method is insufficient. It can be increased by modification of the catalyst with precious metals (e.g. silver) or heterogeneous catalysis can be combined with other oxidative procedures such as ozonation. Another obstacle to the infield use of the method is that separating the catalyst from the liquid phase is difficult. This problem can be eliminated by the immobilization of the catalyst. The poly(vinyl alcohol)-TiO2 immobilized catalyst has been prepared for this purpose. During TiO2-based photocatalysis, active oxygen species such as the hydroxyl radical, superoxide radical and hydrogen peroxide are produced. The formation rate of the oxidative •OH radicals was also determined in the case of the previously mentioned techniques. As a scavenger of this radical, coumarin was added.

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Degradation of industrial surfactants by photocatalysis combined with ozonation

Cited by 14 publications

References 36 publications

TiO2-Mediated Photocatalytic Mineralization of a Non-Ionic Detergent: Comparison and Combination with Other Advanced Oxidation Procedures

TiO2-Mediated Photocatalytic Mineralization of a Non-Ionic Detergent: Comparison and Combination with Other Advanced Oxidation Procedures

Preparation of Date Seed Activation for Surfactant Recovery

Improvement Possibilities of Heterogeneous Photocatalysis with the Aim of In-Field Use

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