Photocatalytic reduction and deposition of metallic ions in aqueous phase

Kanki, Tatsuo; Yoneda, Hiroyuki; Sano, Noriaki; Toyoda, Atsushi; Nagai, Chiaki

doi:10.1016/s1385-8947(03)00112-8

Cited by 50 publications

(32 citation statements)

References 9 publications

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“…Moreover, a linear correlation also existed between the photon flux and quantum yields for the production of $OH [64] and molecular oxygen was found to improve the formation rate of $OH [65]. In addition, the dosage of catalyst [66], pollutants concentration [67], pH [68] and temperature [69] were found to influence the photocatalytic efficiency of TiO 2 .…”

Section: Organic Pollutants Removal By Photo-catalysismentioning

confidence: 85%

Applications of hollow nanomaterials in environmental remediation and monitoring: A review

Zhang

Wang

et al. 2015

Front. Environ. Sci. Eng.

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Hollow nanomaterials have attracted significant attention because of their high chemical and thermal stability, high specific surface area, high porosity, low density, and good biocompatibility. These state-of-the-art nanomaterials have been shown to efficiently adsorb heavy metals, and volatile hazardous substances, photodegrade persistent organic pollutants, and other compounds, and inactivate bacteria. Such properties have enabled the use of these materials for environmental remediation, such as in water/wastewater treatment, soil remediation, air purification, and substance monitoring, etc. Hollow nanomaterials showed higher photocatalytic activity than those without hollow structure owing to their high active surface area, reduced diffusion resistance, and improved accessibility. And, the Doping method could improve the photocatalytic performance of hollow nanomaterials further under visible light. Moreover, the synthetic mechanisms and methods of these materials are important because their size and morphology help to determine their precise properties. This article reviews the environmental applications and potential risks of these materials, in addition to their syntheses. Finally, an outlook into the development of these materials is provided.

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Section: Organic Pollutants Removal By Photo-catalysismentioning

confidence: 85%

Applications of hollow nanomaterials in environmental remediation and monitoring: A review

Zhang

Wang

et al. 2015

Front. Environ. Sci. Eng.

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“…[29][30][31] Photocatalysis has been shown to be an attractive alternative, and using TiO 2 particles in suspension has achieved promising results. [32][33][34] The metal ions present in effluents are usually found complexed by substances such as EDTA or Cyanide, species widely used in industrial applications. The photocatalytic treatment of these solutions has shown several problems where the oxidation of the EDTA is achieved, the reduction of metal ions is not attained; 30 or when cyanide complexes are present.…”

Section: Photo-assisted Electrolytic Copper Ions Removalmentioning

confidence: 99%

“…29 Although the results obtained with particulate materials have shown that the heterogeneous photocatalysis is a promising alternative of remediation for this type of effluent, findings have also revealed disadvantages related with the separation, recovery and recycling of the catalyst and metallic deposits from the treated effluents. [29][30][31][32][33][34] An alternative and effective methodology to overcome these inconveniences is photoassisted electrolysis. 35 With this technique, the TiO 2 is supported on a conductive substrate to be used as the anode and coupled with a conductive material acting as a cathode.…”

Section: Photo-assisted Electrolytic Copper Ions Removalmentioning

confidence: 99%

Formation of TiO2 photoanodes by simultaneous electrophoretic deposition of anatase and rutile particles for photoassisted electrolytic copper ions removal

Peralta-Ruiz¹,

Lizcano-Beltrán²,

Laverde³

et al. 2012

Quím. Nova

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Recebido em 19/4/11; aceito em 16/9/11; publicado na web em 8/11/11The influence of Anatasa/Rutile ratio on TiO 2 films, grown by electrophoretic deposition was studied in the photoassisted electrolytic copper ions removal from cyanide solutions. The proper dispersant dosage allowing the simultaneous electrophoretic deposition of Anatase and Rutile was chosen based on electrokinetic measurements; evidenced by the XRD spectra of the formed films. The evaluation of films photoassisted electrolytic copper ion removal showeds that it is possible to enhance the activity of Anatase films by adding some Rutile exploiting the synergetic interaction between these two materials, achieve by its proper deposition.

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“…Keuntungan dari proses fotokatalisis adalah hanya memerlukan cahaya ultraviolet dan fotokatalis yang harganya murah sehingga metode ini efektif dan aman (Kanki et al, 2004 andWang et al, 2004). Melalui penelitian ini diharapkan limbah anorganik seperti ion Cu(II) dan organik seperti parasetamol dapat diolah secara simultan dan dihilangkan melalui metode fotokatalisis, sehingga dapat memberikan kontribusi dalam solusi pengolahan limbah yang murah dan aman bagi lingkungan sekitar.…”

Section: Introductionunclassified

PHOTOCATALYTIC REDUCTION OF Cu(II) ION AND TiO2-CATALYZED PARACETAMOL PHOTODEGRADATION AS AN ALTERNATIVE METHOD IN WASTE TREATMENT

Anggraini¹,

Hp²,

Santosa³

2016

ALCHEMY J.Pen.Kim

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ABSTRAKBaru-baru ini keberadaan limbah logam berat seperti Cu, Co, Pb, dan lain sebagainya menjadi sangat populer. Kehadiran Cu dapat berada bersama limbah farmasi seperti parasetamol. Proses fotokatalisis dapat digunakan sebagai alternatif dalam penyelesaian masalah ini. Penelitian ini mempelajari pengaruh lama penyinaran dan konsentrasi awal parasetamol terhadap fotoreduksi ion Cu(II) dengan menggunakan katalis TiO2. Tujuan dilakukan penelitian ini untuk mengembangkan metode fotoreduksi yang dikatalisis TiO2 dengan adanya parasetamol guna pengurangan konsentrasi ion Cu(II) dan parasetamol di lingkungan perairan. Proses fotoreduksi ion Cu(II) dilakukan dalam suatu reaktor tertutup dilengkapi dengan lampu UV. Hasil proses fotokatalisis dianalisis menggunakan Spektrofotometer Serapan Atom (SSA) untuk menentukan konsentrasi ion Cu(II) dan Spektrofotometer Visibel untuk menentukan konsentrasi parasetamol. Hasil penelitian menunjukkan bahwa penggunaan fotokatalis TiO2 dapat meningkatkan hasil fotoreduksi ion Cu(II). Fotoreduksi ion Cu(II) terus meningkat selama 15 hingga 45 menit pertama, namun lama penyinaran yang lebih dari 45 menit telah menurunkan fotoreduksi yang relatif kecil. Pada konsentrasi awal parasetamol dari 50 sampai 250 mg/L menghasilkan kenaikan fotodegradasi parasetamol, namun pada konsentrasi yang lebih dari 250 mg/L memberikan penurunan yang relatif besar. Adanya parasetamol dapat meningkatkan efektivitas fotoreduksi ion Cu(II) karena dapat mencegah penggabungan kembali radikal OH• dan elektron. Kondisi reaksi yang menghasilkan fotoreduksi paling efektif adalah 25 mL larutan ion Cu(II) 10 mg/L, 20 mg TiO2 dengan penyinaran selama 45 menit, dan penambahan 25 mL parasetamol 250 mg/L. Pada kondisi tersebut ion Cu(II) tereduksi sebesar 98,87 % dan parasetamol terdegradasi sebesar 14,73 %.

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Photocatalytic reduction and deposition of metallic ions in aqueous phase

Cited by 50 publications

References 9 publications

Applications of hollow nanomaterials in environmental remediation and monitoring: A review

Applications of hollow nanomaterials in environmental remediation and monitoring: A review

Formation of TiO2 photoanodes by simultaneous electrophoretic deposition of anatase and rutile particles for photoassisted electrolytic copper ions removal

PHOTOCATALYTIC REDUCTION OF Cu(II) ION AND TiO2-CATALYZED PARACETAMOL PHOTODEGRADATION AS AN ALTERNATIVE METHOD IN WASTE TREATMENT

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