Titania/C TAB Nanoskeleton as adsorbent and photocatalyst for removal of alkylphenols dissolved in water

Sakai, Toshio; Loves, Albar Da; Okada, Tomohiko; Mishima, Shozi

doi:10.1016/j.jhazmat.2013.01.043

Cited by 13 publications

(5 citation statements)

References 39 publications

(47 reference statements)

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“…The crux of photocatalytic technology was the development of highly efficient photocatalysts [3][4][5][6][7][8]. In accordance with previous reports, many metal oxides such as TiO 2 and ZnO 2 [9,10] had been developed as photocatalysts. Because single photocatalysts had some inherent characteristics, such as photo-etching and wide band gaps, their applications were limited [11,12].…”

Section: Introductionsupporting

confidence: 66%

Synthesis, Property Characterization and Photocatalytic Activity of the Ag3PO4/Gd2BiTaO7 Heterojunction Catalyst under Visible Light Irradiation

et al. 2021

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A new type of Gd2BiTaO7 nanocatalyst (GBT) was synthesized by a high-temperature solid-phase method, and a heterojunction photocatalyst, which was composed of GBT and silver phosphate (AP), was prepared by the facile in-situ precipitation method for the first time. The photocatalytic property of GBT or the Ag3PO4/Gd2BiTaO7 heterojunction photocatalyst (AGHP) was reported. The structural properties of GBT and AGHP were characterized by an X-ray diffractometer, scanning electron microscope–X-ray energy dispersive spectra, an X-ray photoelectron spectrograph, a synchrotron-based ultraviolet photoelectron spectroscope, a Fourier transform infrared spectrometer, an UV-Vis diffuse reflectance spectrophotometer and an electron paramagnetic resonance spectrometer. The results displayed that GBT was well crystallized with a stable cubic crystal system and space group Fd3m. The lattice parameter or band gap energy of GBT was found to be a = 10.740051 Å or 2.35 eV, respectively. After visible light irradiation of 30 min, the removal rate of bisphenol A (BPA) reached 99.52%, 95.53% or 37.00% with AGHP as the photocatalyst, with Ag3PO4 and potassium persulfate (AP-PS) as photocatalysts or with N-doped TiO2 (NT) as a photocatalyst, respectively. According to the experimental data, it could be found that the removal rate of BPA with AGHP as a photocatalyst was 2.69 times higher than that with NT as a photocatalyst. AGHP showed higher photocatalytic activity for photocatalytic degradation of BPA under visible light irradiation compared with GBT or AP-PS or NT. The removal rate of total organic carbon (TOC) was 96.21%, 88.10% or 30.55% with AGHP as a photocatalyst, with AP-PS as photocatalysts or with NT as a photocatalyst after visible light irradiation of 30 min. The above results indicated that AGHP possessed the maximal mineralization percentage ratio during the process of degrading BPA compared with GBT or AP-PS or NT. The results indicated that the main oxidation radical was •OH during the process of degrading BPA. The photocatalytic degradation of BPA with AGHP as a photocatalyst conformed to the first-order reaction kinetics. This study provided inspiration for obtaining visible light-responsive heterojunction photocatalysts with high catalytic activity and efficient removal technologies for organic pollutants and toxic pollutants, and as a result, the potential practical applications of visible light-responsive heterojunction photocatalysts were widened. The subsequent research of thin-film plating of the heterojunction catalysts and the construction of complete photoluminescent thin-film catalytic reaction systems, which utilized visible light irradiation, could provide new technologies and perspectives for the pharmaceutical wastewater treatment industry.

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Section: Introductionsupporting

confidence: 66%

Synthesis, Property Characterization and Photocatalytic Activity of the Ag3PO4/Gd2BiTaO7 Heterojunction Catalyst under Visible Light Irradiation

et al. 2021

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“…The fastest degradation by photo-Fenton in the presence of iron-impregnated faujasite may arise from the larger amount of adsorbed micropollutants and/ or the higher production of radicals. A correlation between the time needed to degrade the pollutant and the contaminant surface coverage was already reported for both photocatalysis and photo-Fenton processes [34,43,44]. The previous studies highlighted that a high adsorption of contaminant increases the efficiency of the degradation process.…”

Section: Degradation Of the Micropollutants Through Photocatalysis Anmentioning

confidence: 79%

Comparison of the removal of 21 micropollutants at actual concentration from river water using photocatalysis and photo-Fenton

et al. 2019

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The development of technologies capable of eliminating a wide spectrum of micropollutants of diverse nature from waters becomes essential. Advanced oxidation processes (AOPs) seem to be the most promising technologies but the most appropriate AOP to remove the micropollutants is still under debate. In this study, for the first time, the comparison of the efficiency of TiO 2 heterogeneous photocatalysis and iron-impregnated faujasite heterogeneous photo-Fenton process is conducted towards the removal of a mixture of 21 micropollutants from a real river at low concentrations. The sampling area is situated on the Meurthe River, downstream the wastewater treatment plant of the city of Nancy in the northeast of France. To assess the impact of the micropollutants concentration and the matrix composition, two sampling campaigns have been performed at different periods of the year. Among the targeted micropollutants, 14 pharmaceuticals, 1 personal care product, 4 endocrine disruptors and 2 perfluorinated molecules are specifically followed. Their concentrations range from few ng L −1 to hundreds ng L −1. The adsorption of all the micropollutants is higher onto the iron-impregnated faujasite compared to that onto TiO 2 due to the larger surface area of the iron-impregnated faujasite. The iron-impregnated faujasite offers superior photo-Fenton oxidation efficiency towards the degradation of the micropollutants over the TiO 2 photocatalysis system. For almost all the micropollutants, the contaminants are totally removed after 30 min by photo-Fenton while a longer period is necessary by photocatalysis. A relationship between the removal efficiencies and the octanol-water partition coefficient (log Kow) of each micropollutant has been extracted from the data. A further economic evaluation confirms that the photo-Fenton process is also the better in terms of cost.

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“…TiO 2 banyak digunakan sebagai semikonduktor untuk degradasi karena mampu mendegradasi senyawa-senyawa organik dan non-organik. Sampai saat ini banyak penelitian yang membuktikan kemampuan fotokatalisis dengan semikonduktor TiO 2 pada degradasi limbah organik dan non-organik seperti zat pewarna sintetik [14,16,17], fenol [1,18] dan krom [2,3].…”

Section: Pendahuluanunclassified

“…Dengan menggabungkan fotokatalis dan adsorben, diharapkan kontak fotokatalis dengan polutan menjadi lebih optimal. Polutan yang teradsorbsi oleh penyangga dapat langsung dioksidasi oleh fotokatalis menjadi CO 2 dan H 2 O dalam waktu yang cukup lama untuk menjadi jenuh sehingga proses degradasi polutan dapat berlangsung lebih efisien [18].…”

Section: Pendahuluanunclassified

EFEKTIVITAS NANOKOMPOSIT TiO2/ZEOLIT PADA PANEL KERAMIK DALAM PENURUNAN LIMBAH FENOL

Naimah

Aviandharie

Ermawati

2018

jsmi

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Telah dilakukan penelitian mengenai efektivitas nanokomposit TiO 2 /zeolit (nanokomposit TZ) pada panel keramik dalam penurunan limbah fenol. Penelitian aplikasi nanokomposit TZ telah banyak dilakukan dalam menurunkan limbah cair organik secara fotokatalisis. Jenis nanokomposit yang banyak digunakan dalam bentuk serbuk, granul, lapisan tipis pada kaca dan stainless steel. Oleh karena itu, penelitian ini akan memanfaatkan panel keramik jenis water base dan solvent base sebagai media menempelnya nanokomposit TZ. Hasil penelitian menunjukkan keramik solvent base memiliki tekstur yang mudah melekatkan nanokomposit TZ sehingga komposit tidak mudah terkelupas selama proses aplikasi, proses aktivasi dan reaktivasi komposit serta tahan pada suhu 350°C sedangkan keramik water base hanya tahan pada suhu 200°C di bawah suhu yang diperlukan untuk aktivasi komposit yaitu 350°C. Keramik solvent base dibuat dengan ketebalan 0,5 mm dan luas area 0,12 m 2 . Variabel flow rate yang digunakan adalah 15 mL/menit, 20 mL/menit, 25 mL/menit, 30 mL/menit, 35 mL/menit, 40 mL/menit, 45 mL/menit, 50 mL/menit dan diperoleh hasil penurunan fenol terbaik 3,59 mg/L pada flow rate 20 mL/menit. Flow rate optimum tersebut digunakan dalam menguji efektivitas nanokomposit TZ pada panel keramik solvent base setelah dipakai beberapa kali. Persentase penurunan limbah fenol setiap pengulangan tidak berbeda signifikan yaitu pemakaian pertama 63,8%, kedua 63,7% dan ketiga 63,2%. Hal ini menunjukkan bahwa lapisan komposit masih melekat kuat pada keramik dan masih efektif. Panel keramik dapat menjadi alternatif sebagai media nanokomposit karena ringan, kuat, mudah dibentuk, tahan panas sehingga akan mempermudah penggunaan nanokomposit dalam aplikasinya.

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Titania/C TAB Nanoskeleton as adsorbent and photocatalyst for removal of alkylphenols dissolved in water

Cited by 13 publications

References 39 publications

Synthesis, Property Characterization and Photocatalytic Activity of the Ag3PO4/Gd2BiTaO7 Heterojunction Catalyst under Visible Light Irradiation

Synthesis, Property Characterization and Photocatalytic Activity of the Ag3PO4/Gd2BiTaO7 Heterojunction Catalyst under Visible Light Irradiation

Comparison of the removal of 21 micropollutants at actual concentration from river water using photocatalysis and photo-Fenton

EFEKTIVITAS NANOKOMPOSIT TiO2/ZEOLIT PADA PANEL KERAMIK DALAM PENURUNAN LIMBAH FENOL

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