Enhanced photocatalytic oxidation of humic acids using Fe3+-Zn2+ co-doped TiO2: The effects of ions in aqueous solutions

Yuan, Rongfang; Liú, Dan; Wang, Shaona; Zhou, Beihai; Ma, Fangshu

doi:10.4491/eer.2017.062

Cited by 14 publications

(4 citation statements)

References 25 publications

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“…Various TiO 2 -based photocatalysts by metallic or/and nonmetallic ions doping and codoping have been successfully used for the degradation of organic pollutants [26][27][28][29][30]. Among various doping methods, nitrogen doping has been considered as one of the most encouraging due to comparable atomic size to oxygen and small ionization energy of nitrogen atom [31].…”

Section: •−mentioning

confidence: 99%

Photocatalytic degradation of flumequine by N-doped TiO2 catalysts under simulated sunlight

Zeng

Sun

Wang

2020

Environmental Engineering Research

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Flumequine (FLU) is one of the most used fluoroquinolone antibiotics in intensive aquaculture, however, it has become a typical pollutant in water environment at present due to inappropriate use. Therefore, it is necessary to develop facile techniques for efficient degradation of FLU. In this work, three N-doped TiO2 photocatalysts were synthesized for degradation of FLU. The obtained photocatalysts were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectrum and UV-Vis diffuse reflection spectra (UV-Vis-DRS). The XRD and XPS results from NH4NO3-doped catalyst (TiO2/AN) confirmed that NO3- ions were successfully incorporated into the lattice of TiO2. The TiO2/AN sample exhibited higher photocatalytic performance than other N-doped catalysts under simulated sunlight irradiation, and 100% removal efficiency of FLU was achieved after 4 hours of illumination. The photogenerated holes (h+) and hydroxyl radicals (•OH) are main reactive species involved in the photocatalytic degradation of FLU. Eight intermediates for photocatalytic degradation of FLU were detected and their toxicities to aquatic organisms were predicted. This study might have important implications for further research on the removal of fluoroquinolone antibiotics in wastewater.

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Section: •−mentioning

confidence: 99%

Photocatalytic degradation of flumequine by N-doped TiO2 catalysts under simulated sunlight

Zeng

Sun

Wang

2020

Environmental Engineering Research

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“…Metode lain yang efektif adalah codoping: logam, nonlogam, atau secara bersamaan logam-nonlogam. Co-doping ion Fe 3+ dan Zn 2+ pada TiO2 menghasilkan sifat fotokatalitik yang lebih baik dibandingkan dengan bahan yang didoping ion besi atau seng saja (Yuan et al, 2018). Contoh lain dari co-doping logam adalah TiO2 yang didoping dengan logam Fe dan Ni (Lin et al, 2017).…”

Section: Pendahuluanunclassified

Studi Density Functional Theory (DFT) Pengaruh Co-doping Zn dan N pada TiO2 Anatas

Shofiyullah

Udaibah

Fitriani

2020

WJC

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Titanium dioksida (TiO2) merupakan salah satu bahan yang menjanjikan yang memenuhi persyaratan fotokatalis. Penelitian ini mempelajari pengaruh doping Zn dan N pada struktur geometri dan elektronik TiO2 anatas. Untuk mengetahui struktur dan proses kinerja fotokatalitik digunakan perhitungan density functional theory (DFT) dengan algoritma generalized gradient approximation (GGA) menggunakan parameterisasi Perdew-Burke-Ernzerhof (PBEsol). Perhitungan struktur elektronik menggunakan parameter Hubbard U. Setelah optimasi terjadi distorsi volume kisi doping Zn 1,011 Å, doping N 1,209 Å dan co-doping Zn-N 1,646 Å. Data tersebut menunjukkan bahwa doping dapat mempengaruhi perubahan struktural. Perhitungan struktur elektronik menghasilkan celah pita TiO2 murni sebesar 3,18 eV, kemudian terjadi penyempitan celah pita yang disebabkan oleh dopan. Celah pita doping Zn 2,9 eV, doping N 2,78 eV dan co-doping Zn-N 2,74 eV. Struktur elektronik baru hasil doping tidak hanya menyebabkan penyempitan celah pita tapi juga dapat menghambat rekombinasi pasangan elektron-hole, secara signifikan dapat meningkatkan aktivitas fotokatalitik TiO2 di daerah cahaya tampak.

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“…The lower residual color after oxidation with H2O2/O3 as the H2O2/O3 ratio increased was attributed to the increased formation of OH radicals [20][21][22][23]. Other studies have reported increased H2O2/O3 ratios and biodegradability after wastewater treatment with O3 and H2O2 [24,25].…”

Section: Optimization Of H2o2/o3 Ratiomentioning

confidence: 99%

Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce

2018

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Currently, the ozone (O3) oxidation efficiency in the treatment of waste soy sauce provides 34.2% color removal and a 27.4% reduction in its chemical oxygen demand (COD). To improve the O3 oxidation efficiency, hydrogen peroxide (H2O2) is used to cause a H2O2/O3 process. In H2O2/O3 process experiments, a previously optimized pH of 11 and applied O3 dose of 50 mg L−1 were used and the H2O2/O3 ratio was varied between 0.1 and 0.9 in intervals of 0.2. The results show that an H2O2/O3 ratio of 0.3 results in the highest efficiencies in terms of color removal (51.6%) and COD reduction (33.8%). Nanofiltration (NF) was used to pretreat the waste soy sauce to improve color removal and COD reduction. The results showed that NF with an NE-70 membrane results in 80.8% color removal and 79.6% COD reduction. Finally, the combination of NF and H2O2/O3 process resulted in the best treatment efficiency: 98.1% color removal and 98.2% COD reduction. Thus, NF & H2O2/O3 process can be considered as one of the best treatment methods for waste soy sauce, which requires high intrinsic color removal and COD reduction efficiencies.

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Enhanced photocatalytic oxidation of humic acids using Fe3+-Zn2+ co-doped TiO2: The effects of ions in aqueous solutions

Cited by 14 publications

References 25 publications

Photocatalytic degradation of flumequine by N-doped TiO2 catalysts under simulated sunlight

Photocatalytic degradation of flumequine by N-doped TiO2 catalysts under simulated sunlight

Studi Density Functional Theory (DFT) Pengaruh Co-doping Zn dan N pada TiO2 Anatas

Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce

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