Photodegradation of phenol in water using silica-supported titania catalysts

Alemany, Luı́s J.; Bañares, Miguel Á.; Pardo, Emilio; Martı́n, Francisco; Galán-Fereres, Mercedes; Blasco, J. M.

doi:10.1016/s0926-3373(97)00006-4

Cited by 99 publications

(43 citation statements)

References 21 publications

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“…Figure 2 shows the XRD patterns of the catalyst ME-2 calcined for 6 h at different temperatures. It is well known that calcination plays an important role in the phase transformation of samples, and can improve the crystallinity of the catalysts [9][10]. As shown in Fig.…”

Section: Photodecomposition Of Methylene Blue (Mb)mentioning

confidence: 99%

Synthesis of nanosized TiO2/SiO2 catalysts by the ultrasonic microemulsion method and their photocatalytic activity

Yang

Zhu

Jun

et al. 2007

React Kinet Catal Lett

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Nanosized TiO 2 /SiO 2 catalysts prepared by hydrolysis of titanium n-butoxide in microemulsion showed enhanced photocatalytic activity. In the presence of catalyst ME-2 and after 90 min irradiation by UV light, methylene blue was completely converted evidenced by the absence of its absorption band in the UV-Vis spectra. This catalyst demonstrated much better degradation ability than P-25 and naked TiO 2 .

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Section: Photodecomposition Of Methylene Blue (Mb)mentioning

confidence: 99%

Synthesis of nanosized TiO2/SiO2 catalysts by the ultrasonic microemulsion method and their photocatalytic activity

Yang

Zhu

Jun

et al. 2007

React Kinet Catal Lett

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“…Penggunaan TiO2 untuk meningkatkan reaksi fotodegradasi zat warna telah dilaporkan [12,13]. TiO2 juga telah dibuktikan dapat mempercepat reaksi fotodegradsi fenol [14,15], p-klorofenol [16,17], pestisida [18], asam-asam karboksilat seperti asam oksalat dan asam malonat [19]. Secara umum hasil penelitian tersebut menunjukkan bahwa metode ini sangat efektif untuk mengoksidasi dan mendetoksi polutan-polutan organik tersebut.…”

Section: Pendahuluanunclassified

Efektivitas Fotodegradasi Amoksisilin yang Dikatalisis dengan TiO2 dengan Keberadaan Ion Ag(I)

Anggraini¹,

Pujilestari²

2017

J. Kim. Sains Apl.

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An intensive use of medicines and their product provides not only benefits for human health but also carries side effect, such as an accumulation of waste. In the water environment, amoxicillin waste could mix with inorganic waste, such as Ag(I) ion. In this research, the study on amoxicillin photodegradation was conducted by combining UV-irradiation, semiconductor particles as the photocatalyst, and the presence of Ag(I) ions. This research aimed to determine the influence of UV-irradiation time, initial Ag(I) concentration, and the optimum conditions of amoxicillin photodegradation catalyzed by TiO2 in the presence of Ag(I) ions. Amoxicillin photodegradation process was conducted in a closed reactor equipped with a magnetic stirrer and UV light. The results are then analyzed by UV spectrophotometer to determine the remaining amoxicillin concentration and atomic absorption spectrophotometer (AAS) to evaluate the concentration of the unreduced Ag(I) ions. The results showed that the degraded amoxicillin increased with increasing duration of irradiation due to the long contact between the TiO2 photocatalyst and the UV light, and the contact between amoxicillin and the radical •OH. The presence of Ag(I) ions might increase the effectiveness of amoxicillin photodegradation due to the prevention of the recombination between radical •OH from hole species and the excited electron. The optimum condition of amoxicillin photodegradation is reached 32.40 % when 25 mL amoxicillin 200 mg/L and 25 mL of Ag(I) solution 40 mg/L, were added by 20 mg of TiO2 and irradiated by UV light for 90 minutes. Under the same condition, Ag(I) ion was reduced up to 70.40 %. A b s t r a kKata kunci: amoksisilinelektron, radikal •OH, fotodegradasi, ion Ag(I).Pemakaian obat dan sediaannya secara intensif, selain memberikan keuntungan dalam pelayanan kesehatan juga memiliki efek sekunder yaitu akumulasi limbah yang tidak diinginkan. Akumulasi zat antibiotik seperti amoksisilin di perairan dapat menyebabkan resistensi. Di lingkungan, limbah amoksisilin dapat bersama-sama dengan limbah anorganik seperti ion Ag(I). Kajian tentang fotodegradasi dilakukan dengan menggabungkan cahaya ultraviolet dan partikel semikonduktor sebagai fotokatalis. Hal tersebut dilakukan untuk mengetahui pengaruh penyinaran, keberadaan ion Ag(I), dan kondisi optimum terhadap efektivitas fotodegradasi amoksisilin yang dikatalisis TiO2 dengan kehadiran ion Ag(I). Proses fotodegradasi amoksisilin dilakukan dalam suatu reaktor tertutup dilengkapi dengan satu set alat pengaduk magnetik dan lampu UV. Hasil kemudian dianalisis dengan Spektrofotometer UV untuk mengetahui konsentrasi amoksisilin sisa dan Spektrofotometer Serapan Atom (SSA) untuk mengetahui konsentrasi ion Ag(I) sisa. Hasil penelitian menunjukkan bahwa amoksisilin yang terdegradasi meningkat dengan semakin lamanya waktu penyinaran karena lamanya

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“…[9][10][11] Besides, it has been proved that Ce ion, as one of the rare earth metals, has the ability to enhance the photocatalytic activity of titania. 12,13 In order to eliminate the second problem, many techniques were proposed for the immobilization of TiO 2 on solid supports such as silica, 14 alumina, 15 zeolites, 16 activated carbon (AC) 17,18 and activated carbon fiber (ACF). 19,20 But these methods largely make surface area of TiO 2 to decrease, which is not disadvantage for it to decompose waste.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ce‐doped TiO₂ Hollow Fibers and Their Photocatalytic Degradation Properties for Dye Compound

Shi

Zhou

Zheng

et al. 2013

J Chinese Chemical Soc

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Cerium-doped titanium dioxide (TiO 2 ) with a hollow fiber structure was successfully prepared using ammonium ceric nitrate and tetrabutyltitanate as precursors and cotton fiber as the template. The effects of cerium (Ce)-doping on the crystallite sizes, crystal pattern, and optical property of the prepared catalysts were investigated by means of techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD), BET surface area, and UV-vis diffuse absorption spectroscopy. SEM observation showed that the prepared TiO 2 fibers possessed fibrous shape inherited from the cotton fiber and had a hollow structure. As confirmed by XRD and UV-vis diffuse absorption spectroscopy examinations, Ce-doping restrained the growth of grain size and extended the photoabsorption edge of TiO 2 hollow fiber into the visible light region. The present photocatalyst showed higher photocatalytic reactivity in photodegradation of highly concentrated methylene blue (MB) solutions than pure TiO 2 under UV and visible light, and the amount of Ce-doped significantly affected the catalytic property. In the experiment condition, the photocatalytic activity of 0.5 mol% Ce-doped TiO 2 fiber was optimal of all the prepared samples. In addition, the possibility of cyclic usage of the photocatalyst was also confirmed. The material was easily removed by centrifugal separation. Therefore, using the template method and by doping with cerium, TiO 2 may hopefully become a low-energy consuming, high activity and green environmentally friendly catalytic material.

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Photodegradation of phenol in water using silica-supported titania catalysts

Cited by 99 publications

References 21 publications

Synthesis of nanosized TiO2/SiO2 catalysts by the ultrasonic microemulsion method and their photocatalytic activity

Synthesis of nanosized TiO2/SiO2 catalysts by the ultrasonic microemulsion method and their photocatalytic activity

Efektivitas Fotodegradasi Amoksisilin yang Dikatalisis dengan TiO2 dengan Keberadaan Ion Ag(I)

Preparation of Ce‐doped TiO₂ Hollow Fibers and Their Photocatalytic Degradation Properties for Dye Compound

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Photodegradation of phenol in water using silica-supported titania catalysts

Cited by 99 publications

References 21 publications

Synthesis of nanosized TiO2/SiO2 catalysts by the ultrasonic microemulsion method and their photocatalytic activity

Synthesis of nanosized TiO2/SiO2 catalysts by the ultrasonic microemulsion method and their photocatalytic activity

Efektivitas Fotodegradasi Amoksisilin yang Dikatalisis dengan TiO2 dengan Keberadaan Ion Ag(I)

Preparation of Ce‐doped TiO2 Hollow Fibers and Their Photocatalytic Degradation Properties for Dye Compound

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Preparation of Ce‐doped TiO₂ Hollow Fibers and Their Photocatalytic Degradation Properties for Dye Compound