Immobilized Nanopillars-TiO2 in the efficient removal of micro-pollutants from aqueous solutions: Physico-chemical studies

Lalhriatpuia, C.; Tiwari, Diwakar; Tiwari, Alka; Lee, Seung Mok

doi:10.1016/j.cej.2015.07.032

Cited by 50 publications

(14 citation statements)

References 58 publications

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“…Additionally, 19.4% of PC efficiency for degradation of aspirin was obtained, suggesting H2O2 was involved in the aspirin degradation [39]. Similarly, BQ exhibited considerable inhibition of the PC degradation of aspirin (16.3%) [40]. Moreover, with the addition of K2Cr2O7 during the PC process [41], the PC efficiency of aspirin (13.1%) was partially suppressed, suggesting that the role of electron (e − ) was smaller than that of H2O2 in our PC system.…”

Section: Analysis Of Degradation Intermediatesmentioning

confidence: 91%

Photocatalytic Performance and Degradation Mechanism of Aspirin by TiO2 through Response Surface Methodology

Wang

et al. 2018

Catalysts

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Abstract:In the present work, the photocatalytic performance of P25TiO 2 was investigated by means of the degradation of aspirin, while the reaction system was systematically optimized by central composite design (CCD) based on the response surface methodology (RSM). In addition, three variables of initial pH value, initial aspirin concentration and P25 concentration were selected to assess the dependence of degradation efficiencies of aspirin. Meanwhile, a predicted model of degradation efficiency was estimated and checked using analysis of variance (ANOVA). The results indicated that the PC removal of aspirin by P25 was significantly influenced by all these variables in descending order as follows: P25 concentration > initial aspirin concentration > initial pH value. Moreover, the parameters were optimized by the CCD method. Under the conditions of an initial pH value of 5, initial aspirin concentration of 10 mg/L and P25 concentration of 50 mg/L, the degradation efficiency of aspirin was 98.9%with 60 min of Xenon lamp irradiation. Besides, based on the liquid chromatography-mass spectrometry measurements, two main PC degradation pathways of aspirin by TiO 2 were deduced and the tentative degradation mechanism was also proposed.

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Section: Analysis Of Degradation Intermediatesmentioning

confidence: 91%

Photocatalytic Performance and Degradation Mechanism of Aspirin by TiO2 through Response Surface Methodology

Wang

et al. 2018

Catalysts

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“…Further, the kinetics of the photocatalytic degradation of tetracycline were studied. It was been reported that degradation of tetracycline followed pseudo first order kinetics [34][35]. According to the following equation, the Ln (C 0 /C t ) values are obtained and graphically presented in Fig.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Hydrothermal synthesis of novel flower-like BiVO 4 /Bi 2 Ti 2 O 7 with superior photocatalytic activity toward tetracycline removal

Han

Guo

et al. 2016

Applied Catalysis A: General

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“…Photocatalysts in the immobilised form are far less common in the literature, and many reports dealing with TiO 2 and ZnO immobilization do not report reuse efficiency of the immobilised photocatalyst [23,[40][41][42][43], despite reusability being one of the main advantages of immobilised HPC over suspension based one [43]. Lalhriatpuia et al [44] reported encouraging results of reusability of immobilised titania. This catalyst used five times against tetracycline and diclofenac showed minor reduction in removal rates for the former compound and low reduction of activity for the latter compound.…”

Section: Photocatalytic Degradation Of Antibioticsmentioning

confidence: 99%

Immobilised Cerium-Doped Zinc Oxide as a Photocatalyst for the Degradation of Antibiotics and the Inactivation of Antibiotic-Resistant Bacteria

et al. 2019

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The threat of antibiotic resistance to the wellbeing of societies is well established. Urban wastewater treatment plants (UWTPs) are recognised sources for antibiotic resistance dissemination in the environment. Herein a novel cerium-doped zinc oxide (Ce-ZnO) photocatalyst is compared to ZnO and the benchmark TiO2-P25 in the immobilised form on a metallic support, to evaluate a photocatalytic process as a possible tertiary treatment in UWTPs. The catalysts were compared for the removal of two antibiotics, trimethoprim (TMP) and sulfamethoxazole (SMX), and for the inactivation of Escherichia coli (E. coli) strain DH5-Alpha in isotonic sodium chloride solution and of autochthonous bacteria in real secondary wastewater. In real wastewater, E. coli and other coliforms were monitored, as well as the respective fractions resistant to ofloxacin and azithromycin. In parallel, Pseudomonas aeruginosa and the respective sub-population resistant to ofloxacin or ciprofloxacin were also monitored. Photocatalysis with both ZnO and Ce-ZnO was faster than using TiO2-P25 at degrading the antibiotics, with Ce-ZnO the fastest against SMX but slower than undoped ZnO in the removal of TMP. Ce-ZnO catalyst reuse in the immobilised form produced somewhat slower kinetics maintained >50% of the initial activity, even after five cycles of use. Approximately 3 log10 inactivation of E. coli in isotonic sodium chloride water was recorded with reproducible results. In the removal of autochthonous bacteria in real wastewater, Ce-ZnO performed better (more than 2 log values higher) than TiO2-P25. In all cases, E. coli and other coliforms, including their resistant subpopulations, were inactivated at a higher rate than P. aeruginosa. With short reaction times no evidence for enrichment of resistance was observed, yet with extended reaction times low levels of bacterial loads were not further inactivated. Overall, Ce-ZnO is an easy and cheap photocatalyst to produce and immobilise and the one that showed higher activity than the industry standard TiO2-P25 against the tested antibiotics and bacteria, including antibiotic-resistant bacteria.

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Immobilized Nanopillars-TiO2 in the efficient removal of micro-pollutants from aqueous solutions: Physico-chemical studies

Cited by 50 publications

References 58 publications

Photocatalytic Performance and Degradation Mechanism of Aspirin by TiO2 through Response Surface Methodology

Photocatalytic Performance and Degradation Mechanism of Aspirin by TiO2 through Response Surface Methodology

Hydrothermal synthesis of novel flower-like BiVO 4 /Bi 2 Ti 2 O 7 with superior photocatalytic activity toward tetracycline removal

Immobilised Cerium-Doped Zinc Oxide as a Photocatalyst for the Degradation of Antibiotics and the Inactivation of Antibiotic-Resistant Bacteria

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