Bi2Ti2O7/TiO2/RGO composite for the simulated sunlight-driven photocatalytic degradation of ciprofloxacin

Li, Wenguang; Zuo, Yuanjie; Jiang, Ling; Yao, Dachuan; Chen, Zhongjing; He, Guangyu; Chen, Haiqun

doi:10.1016/j.matchemphys.2020.123650

Cited by 45 publications

(14 citation statements)

References 69 publications

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“…As such, photocatalysis is observed to be the most popular technique. It is an excellent approach to degrade the toxic pollutants from an aqueous system due to its high efficiency, nontoxicity, and the formation of nonhazardous secondary pollutants only . Several types of semiconductor photocatalysts have been documented in previous studies such as titanium dioxide (TiO 2 ), zinc oxide (ZnO), and copper oxide (CuO) .…”

Section: Introductionmentioning

confidence: 99%

Titanium Dioxide/Polyvinyl Alcohol/Cork Nanocomposite: A Floating Photocatalyst for the Degradation of Methylene Blue under Irradiation of a Visible Light Source

et al. 2021

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Photocatalytic degradation by the titanium dioxide (TiO2) photocatalyst attracts tremendous interest due to its promising strategy to eliminate pollutants from wastewater. The floating photocatalysts are explored as potential candidates for practical wastewater treatment applications that could overcome the drawbacks posed by the suspended TiO2 photocatalysis system. The problem occurs when the powdered TiO2 applied directly into the treated solution will form a slurry, making its reuse become a difficult step after treatment. In this study, the immobilization of titanium dioxide nanoparticles (TiO2 NPs) on the floating substrate (cork) employing polyvinyl alcohol (PVA) as a binder to anchor TiO2 NPs on the surface of the cork was carried out. Characterizations such as Fourier transformer infrared, X-ray diffraction (XRD), ultraviolet–visible spectroscopy (UV–vis), zeta potential, photoluminescence spectroscopy, femtosecond to millisecond time-resolved visible to mid-IR absorption spectroscopy, ion chromatography, and scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM–EDX) analyses were employed. XRD analysis revealed the formation of anatase-phase TiO2 NPs. The results demonstrated that the crystallite size was 9.36 nm. The band gap energy of TiO2 NPs was determined as 3.0 eV. PL analysis verified that TiO2 NPs possessed a slower recombination rate of electron–hole pairs as compared to anatase TiO2. The result was attributed by the behavior of photogenerated charge carriers on TiO2 NPs, which existed as shallowly trapped electrons that could survive longer than a few milliseconds in this study. Furthermore, SEM–EDX analysis indicated that TiO2 NPs were well distributed on the surface of the cork. At the optimal mole ratio of TiO2/PVA (1:8), the TiO2/PVA/cork floating photocatalyst degraded at 98.43% of methylene blue (MB) under a visible light source which performed better than under sunlight irradiation (77.09% of MB removal) for 120 min. Besides, the mineralization result has measured the presence of sulfate anions after photocatalytic activities, which achieved 86.13% (under a visible light source) and 65.34% (under sunlight). The superior photodegradation performance for MB was mainly controlled by the reactive oxygen species of the superoxide radical (•O2 –). The degradation kinetics of MB followed the first-order kinetics. Meanwhile, the Langmuir isotherm model was fitted for the adsorption isotherm. The floating photocatalyst presented good reusability, resulting in 78.13% of MB removal efficiency even after five cycles. Our TiO2/PVA/cork floating photocatalyst fabrication and high photocatalytic performance are potentially used in wastewater treatment, especially under visible light irradiation.

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Section: Introductionmentioning

confidence: 99%

Titanium Dioxide/Polyvinyl Alcohol/Cork Nanocomposite: A Floating Photocatalyst for the Degradation of Methylene Blue under Irradiation of a Visible Light Source

et al. 2021

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“…In a study performed by [85], the photocatalytic degradation of CIP by Zn-doped Cu 2 O particles in ultrapure water illuminated by visible light (>400 nm) had a calculated E EO of 35,000 kWh m −3 . Another study of photocatalytic degradation of CIP [86], using a Bi 2 Ti 2 O 7 /TiO 2 /RGO catalyst under visible light in ultrapure water had an E EO of 26,000 kWh m −3 . Degradation of SMX and TMP in urban wastewater using a TiO 2 P25 catalyst (slurry, 1000 mg/L) and UV-A LEDs obtained E EO s of 30 and 60 kWh m −3 , respectively [87].…”

Section: Electrical Energy Per Order (Eeo) Analysismentioning

confidence: 99%

Performance of TiO2/UV-LED-Based Processes for Degradation of Pharmaceuticals: Effect of Matrix Composition and Process Variables

et al. 2022

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Ultra-violet light-emitting diode (UV-LED)-based processes for water treatment have shown the potential to surpass the hurdles that prevent the adoption of photocatalysis at a large scale due to UV-LEDs’ unique features and design flexibility. In this work, the degradation of five EU Watch List 2020/1161 pharmaceutical compounds was comprehensively investigated. Initially, the UV-A and UV-C photolytic and photocatalytic degradation of individual compounds and their mixtures were explored. A design of experiments (DoE) approach was used to quantify the effects of numerous variables on the compounds’ degradation rate constant, total organic carbon abatement, and toxicity. The reaction mechanisms of UV-A photocatalysis were investigated by adding different radical scavengers to the mix. The influence of the initial pH was tested and a second DoE helped evaluate the impact of matrix constituents on degradation rates during UV-A photocatalysis. The results showed that each compound had widely different responses to each treatment/scenario, meaning that the optimized design will depend on matrix composition, target pollutant reactivity, and required effluent standards. Each situation should be analyzed individually with care. The levels of the electrical energy per order are still unfeasible for practical applications, but LEDs of lower wavelengths (UV-C) are now approaching UV-A performance levels.

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“…In 2020, Li et al [151] reported the synthesis of visible-lightdriven Bi 2 Ti 2 O 7 /TiO 2 /RGO composite using the solvothermal method for efficient photocatalytic removal of CIP with an efficiency of (∼ 90 % within 180 min) of CIP. The improved photocatalytic performance was attributed to the synergistic effects between Bi 2 Ti 2 O 7 , TiO 2 , and RGO.…”

Section: Bi-based Heterostructurementioning

confidence: 99%

“…In 2020, Li et al [151] . reported the synthesis of visible‐light‐driven Bi 2 Ti 2 O 7 /TiO 2 /RGO composite using the solvothermal method for efficient photocatalytic removal of CIP with an efficiency of (∼90 % within 180 min) of CIP.…”

Section: Different Composites and Heterostructures In Antibiotic Removalmentioning

confidence: 99%

Advancement towards Antibiotic Remediation: Heterostructure and Composite materials

2021

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Today's world is on the verge of antibiotic pollution by humans, veterinary therapeutics polluting our water body, and on account of the scarcity in advanced water treatment techniques in the wastewater treatment plants (WWTPs). It is of enormous importance to have an insight into various kinds of antibiotics and their attributes. The primary aspects of antimicrobial resistance caused by antibiotic pollution in the environment have been briefly enlightened. Here the nature and occurrence of antibiotics accumulation in the environment and a world pollution scenario have been illustrated. Adsorption and photocatalysis are the most standard techniques used for remediation. The well‐known nano photocatalyst heterostructure materials Titanium dioxide (TiO2), bismuth (Bi) materials are also utilized as the main frame materials for the composites and heterostructures. Alternatively, the porous carbon‐based materials and metal‐organic framework (MOF) materialsare entitled to their excellent adsorption capability. This review portrays comprehensive insight into the advances and breakthroughs made so far by different heterostructures and nanocomposite materials for antibiotics removal and provides a road map to future researchers towards a more efficient water treatment system.

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Bi2Ti2O7/TiO2/RGO composite for the simulated sunlight-driven photocatalytic degradation of ciprofloxacin

Cited by 45 publications

References 69 publications

Titanium Dioxide/Polyvinyl Alcohol/Cork Nanocomposite: A Floating Photocatalyst for the Degradation of Methylene Blue under Irradiation of a Visible Light Source

Titanium Dioxide/Polyvinyl Alcohol/Cork Nanocomposite: A Floating Photocatalyst for the Degradation of Methylene Blue under Irradiation of a Visible Light Source

Performance of TiO2/UV-LED-Based Processes for Degradation of Pharmaceuticals: Effect of Matrix Composition and Process Variables

Advancement towards Antibiotic Remediation: Heterostructure and Composite materials

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