Intimately coupled photocatalysis and biodegradation for effective simultaneous removal of sulfamethoxazole and COD from synthetic domestic wastewater

Liu, Qidi; Hou, Jun; Wu, Jun; Miao, Lingzhan; You, Guoxiang; Ao, Yanhui

doi:10.1016/j.jhazmat.2021.127063

Cited by 31 publications

(8 citation statements)

References 54 publications

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“…6a). The degradation efficiencies of TC by FO/CN (30), FO/CN (50), and FO/CN (70) in the presence of H2O2 were 76%, 78%, and 72%, respectively. Furthermore, the experiments displayed that the activities of FO/CN improved with the augment of FO content.…”

Section: Photo-fenton Catalytic Activity Under Visible Lightmentioning

confidence: 96%

“…In addition, under the same conditions, α-Fe2O3 hexagonal nanosheets were prepared without adding g-C3N4. The obtained products were named FO/CN (30), FO/CN (50), and FO/CN (70) according to α-Fe2O3/g-C3N4 with 30%, 50%, 70% mass ratios of α-Fe2O3.…”

Section: Synthesis Of G-c3n4mentioning

confidence: 99%

“…As a promising method, semiconductor photocatalysis technology can absorb optical energy to produce free radicals used for tetracycline decomposition in water [7][8][9][10][11][12][13][14][15][16][17][18][19][20] . Photocatalytic technology can degrade and mineralize organic pollutants into H2O and CO2 under a mild condition [21][22][23][24][25][26][27][28][29][30][31] . Recently, g-C3N4 received more and more in-depth research as a developed semiconductor because of its stability, special layered morphology, and favourable reduction properties.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Degradation of Tetracycline via Coupling of Photocatalysis and Photo-Fenton Processes over a 2D/2D α-Fe2O3/g-C3N4 S-scheme Heterojunction Catalyst

Wang¹,

Zhang²,

Chen³

et al. 2022

Acta Physico Chimica Sinica

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Graphitic carbon nitride (g-C3N4) has been widely used as a potential photocatalytic material for the removal of tetracycline from water. However, the poor visible light absorption ability and high recombination rate of the photogenerated charge significantly inhibit the catalytic activity of g-C3N4. Therefore, facile methods to improve the photocatalytic efficiency of g-C3N4 need to be developed. Hematite (α-Fe2O3), which has a good visible light absorption and corrosion resistance, is often used for photocatalysis and photo-Fenton reactions. Therefore, a two-dimension/two-dimension (2D/2D) S-scheme heterojunction constructed of g-C3N4 and α-Fe2O3 nanosheets could be expected to improve the degradation efficiency of tetracycline. In this study, 2D/2D Sscheme α-Fe2O3/g-C3N4 photo-Fenton catalysts were prepared using a hydrothermal strategy. The photo-Fenton catalytic activity of α-Fe2O3/g-C3N4 (α-Fe2O3 50% (w)) was significantly improved by the addition of a small amount of H2O2, removing 78% of tetracycline within 20 min, which was approximately 3.5 and 5.8 times the removal achieved using α-Fe2O3 and g-C3N4, respectively. The high catalytic activity was attributed to the synergy between the photocatalysis and Fenton reaction promoted by the continuous Fe 3+ /Fe 2+ conversion over the 2D/2D S-scheme heterojunction. The 2D/2D S-scheme heterojunction was crucial in the fabrication of the α-Fe2O3/g-C3N4 photocatalyst with a large surface area, adequate active sites, and strong oxidation-reduction capability. Furthermore, the photo-Fenton reaction provided additional hydroxyl radicals for the degradation of tetracycline with the aid of H2O2. The excess reaction product (Fe 3+ ) was reduced to Fe 2+ by the photogenerated electrons from the conduction band of α-Fe2O3. The resulting Fe 2+ could participate in the photo-Fenton reaction. The morphological structures of α-Fe2O3/g-C3N4 were analyzed using transmission electron microscopy to demonstrate the formation of a 2D/2D structure with face-to-face contact, and the optical properties of the composites were measured using ultraviolet-visible diffuse reflectance spectroscopy. α-Fe2O3/g-C3N4 possessed a significantly improved visible light absorption compared to g-C3N4. Five sequential cyclic degradation tests and X-ray diffraction (XRD) patterns obtained before and after the reaction showed that the α-Fe2O3/g-C3N4 composites possessed stable photo-Fenton catalytic activity and crystal structures. Transient photocurrent responses of α-Fe2O3/g-C3N4 demonstrated that the prepared composites exhibited a higher charge transfer efficiency compared to that of single α-Fe2O3 and g-C3N4. In addition, according to the photoluminescence analysis and active species trapping experiments, a possible S-scheme heterojunction charge transfer process in the photo-Fenton catalytic reaction was proposed. This study provided a promising method for the construction of a high-performance photo-Fenton catalytic system to remove antibiotics from wastewater.

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Section: Photo-fenton Catalytic Activity Under Visible Lightmentioning

confidence: 96%

Section: Synthesis Of G-c3n4mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient Degradation of Tetracycline via Coupling of Photocatalysis and Photo-Fenton Processes over a 2D/2D α-Fe2O3/g-C3N4 S-scheme Heterojunction Catalyst

Wang¹,

Zhang²,

Chen³

et al. 2022

Acta Physico Chimica Sinica

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“…Several Solar Photocatalytic Water Treatments Reactors have been created and tested during the previous 15 years (Enesco 2021). The following are the four most prevalent reactor designs (Baştürk and Karataş 2021;Liu et al 2022b;Alsarayreh et al 2022).…”

Section: Photocatalytic Solar Reactormentioning

confidence: 99%

The photocatalytic process in the treatment of polluted water

2022

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Wastewaters often contain toxic organic pollutants with a possible adverse effect on human health and aquatic life upon exposure. Persistent organic pollutants such as dyes and pesticides, pharmaceuticals, and other chemicals are gaining extensive attention. Water treatment utilizing photocatalysis has recently received a lot of interest. Photocatalysis is cutting-edge, alternative technology. It has various advantages, including functioning at normal temperatures and atmospheric pressure, cheap prices, no secondary waste creation, and being readily available and easily accessible. This review presented a comprehensive overview of the advances in the application of the photocatalytic process in the treatment of highly polluted industrial wastewater. The analysis of various literature revealed that TiO 2 -based photocatalysts are highly effective in degrading organic pollutants from wastewater compared to other forms of wastewater treatment technologies. The electrical structure of a semiconductor plays a vital role in the photocatalyst's mechanism. The morphology of a photocatalyst is determined by the synthesis method, chemical content, and technical characteristics. The scaled-up of the photoreactors will significantly help in curbing the effect of organic pollutants in wastewater.

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“…Over the course of the experiment, the dissolved oxygen (DO) concentration inside the MBR varied between 2.1 and 7.39 mg/L. The oxygen circulation effectiveness is hindered by the high mixed solids concentration, needing a high aeration flow rate to maintain the dissolved oxygen concentration (Liu et al 2022). The disadvantages of MBR system are minimized by selecting the best process parameters and operations.…”

Section: Key Parameters and Their Effects On The Mbr Performancementioning

confidence: 99%

Domestic wastewater treatment by membrane bioreactor system and optimization using response surface methodology

Sonawane

Murthy

2021

Int. J. Environ. Sci. Technol.

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One of the most widespread problems afflicting people throughout the world is adequate access to clean water. Problems with water are expected to grow worse in the coming decades, with water scarcity occurring globally, even in regions currently considered water-rich. Research on the effects of temperature, transmembrane pressure (TMP), and aeration rate on the quality of effluent is of great significance in the case of membrane bioreactor. By means of the box-Behnken design (BBD) response surface methodology experiments; for the experimental investigation, the three factors are selected for optimization like the temperature is optimized in the range of 27.6-37.4 °C, transmembrane pressure is 35-63 mm Hg, and aeration rate is optimized in the range of 75-90 L/min and regression models are established. The optimal control parameters of temperature, TMP, and aeration rate are found utilizing the BBD optimizer. The removal mechanism of pollutants is discussed, and GC-MS analysis of effluent of the MBR system is also reported. The results show that the aeration flow rate affected effluent quality more significantly compared to temperature and TMP. When the aeration flow rate is 90 L/min, the temperature is 37.4 °C, and TMP is 35 mm Hg, the obtained COD, BOD, TKN, and TP values achieve the standard quality governed by the Central Pollution Control Board (CPCB) of India.

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Intimately coupled photocatalysis and biodegradation for effective simultaneous removal of sulfamethoxazole and COD from synthetic domestic wastewater

Cited by 31 publications

References 54 publications

Efficient Degradation of Tetracycline <i>via</i> Coupling of Photocatalysis and Photo-Fenton Processes over a 2D/2D α-Fe<sub>2</sub>O<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> S-scheme Heterojunction Catalyst

Efficient Degradation of Tetracycline <i>via</i> Coupling of Photocatalysis and Photo-Fenton Processes over a 2D/2D α-Fe<sub>2</sub>O<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> S-scheme Heterojunction Catalyst

The photocatalytic process in the treatment of polluted water

Domestic wastewater treatment by membrane bioreactor system and optimization using response surface methodology

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