Effect of formate and methanol on photoreduction/removal of toxic cadmium ions using TiO2 semiconductor as photocatalyst

Nguyen, Vi Nu Hoai; Amal, Rose; Beydoun, Donia

doi:10.1016/s0009-2509(03)00336-1

Cited by 119 publications

(57 citation statements)

References 34 publications

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“…The thus-formed electrons and holes participate in redox processes at the semiconductor/water interface [Eqs. (1) and (2) [45] Such high photonic efficiencies of the mesoporous TiO 2 as compared with P-25 can be attributed to several effects, such as a lower light-scattering effect of the ordered mesopores, an accumulated local concentration of COH, or fast transport of the target molecule CH 3 OH to the active sites due to the facile diffusion of the CH 3 OH through the mesoporous network. In the presence of RuO 2 , the valance-band holes migrate to the surface of the particles where they react with adsorbed hydroxide ions, generating adsorbed COH radicals.…”

Section: Proposed Reaction Mechanismmentioning

confidence: 99%

Study of the Efficiency of UV and Visible‐Light Photocatalytic Oxidation of Methanol on Mesoporous RuO₂–TiO₂ Nanocomposites

2011

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Mesoporous RuO(2)-TiO(2) nanocomposites at different RuO(2) concentrations (0-10 wt%) are prepared through a simple one-step sol-gel reaction of tetrabutyl orthotitanate with ruthenium(III) acetylacetonate in the presence of an F127 triblock copolymer as structure-directing agent. The thus-formed RuO(2)-TiO(2) network gels are calcined at 450 °C for 4 h leading to mesoporous RuO(2)-TiO(2) nanocomposites. The photocatalytic CH(3)OH oxidation to HCHO is chosen as the test reaction to examine the photocatalytic activity of the mesoporous RuO(2)-TiO(2) nanocomposites under UV and visible light. The photooxidation of CH(3)OH is substantially affected by the loading amount and the degree of dispersion of RuO(2) particles onto the TiO(2), which indicates the exclusive effect of the RuO(2) nanoparticles on this photocatalytic reaction under visible light. The measured photonic efficiency ξ=0.53% of 0.5 wt% RuO(2)-TiO(2) nanocomposite for CH(3)OH oxidation is maximal and the further increase of RuO(2) loading up to 10 wt% gradually decreases this value. The cause of the visible-light photocatalytic behavior is the incorporation of small amounts of Ru(4+) into the anatase lattice. On the other hand, under UV light, undoped TiO(2) shows a very good photonic efficiency, which is more than three times that for commercial photocatalyst, P-25 (Evonik-Degussa); however, addition of RuO(2) suppresses the photonic efficiency of TiO(2). The proposed reaction mechanism based on the observed behavior of RuO(2)-TiO(2) photocatalysts under UV and visible light is explored.

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Section: Proposed Reaction Mechanismmentioning

confidence: 99%

Study of the Efficiency of UV and Visible‐Light Photocatalytic Oxidation of Methanol on Mesoporous RuO₂–TiO₂ Nanocomposites

2011

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“…It is well established that morphological and structural parameters strongly affect the adsorption and photocatalytic activity of TiO 2 materials [6][7][8][9]. TiO 2 can exist in three crystalline modifications: rutile (tetragonal), anatase (tetragonal), and brookite (orthorhombic).…”

Section: Introductionmentioning

confidence: 99%

Removal of aqueous toxic Hg(II) by synthesized TiO2 nanoparticles and TiO2/montmorillonite

Dou

Dupont

Pan

et al. 2011

Chemical Engineering Journal

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Abstract:The adsorption and photocatalytic reduction of toxic Hg(II) in aqueous solutions at different temperatures were investigated with synthesized TiO 2 nanoparticles and TiO 2 /montmorillonite. The latter were tested by TGA, BET, TEM and XRD methods. The 9.1nm diameter TiO 2 nanoparticles had a specific surface area exceeding 200 m 2 g -1 . High purity anatase TiO 2 nanoparticles were produced at 500 C.

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“…Senyawa sianida adalah salah satu bahan organik yang terdapat dalam limbah tapioka yang merupakan suatu substansi yang sangat beracun bagi kehidupan makhluk hidup (Ariesyady, 1996) (Slamet, 2008). Ada beberapa hal yang mempengaruhi aktifitas fotokatalis TiO 2 yaitu konsentrasi senyawaan organik, pH dari medium, serta sumber sinar yang digunakan (Dingwang, 1999 ;Nguyen, 2003). Diharapkan penelitian ini dapat memberikan informasi tentang penggunaan fotokatalis TiO 2 dalam menurunkan kadar sianida dan sebagai metode alternatif dalam menangani pencemaran lingkungan.…”

Section: Pendahuluanunclassified

PENURUNAN KADAR SIANIDA DALAM LIMBAH CAIR TAPIOKA MENGGUNAKAN FOTOKATALIS TiO2

Riyani

Setyaningtyas

2010

Molekul

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Cyanide compound is one of the organic material contained in wastewater of tapioca production, which is a highly toxic substance for life. According to the results of physical and chemical properties of liquid waste samples of tapioca starch in the deposition process in the industry taken from Pancasan Village, Ajibarang, Banyumas, cyanide concentration in the effluent was 3.8 mg/L while the maximum level of cyanide allowed in industrial wastewater are 0.5 mg/L. Therefore, a method to reduce the concentration of cyanide is needed. One of the method is using of TiO 2 catalyst. This study was aimed to determine the effect of the pH and UV irradiation time on photocatalytic activity of TiO 2 to reduce the levels of cyanide on tapioca wastewater from PT. HARUM BUNGA, Purbalingga.This study uses a thin layer of TiO 2 photocatalyst prepared by suspension of TiO 2 coating on the glass plate that was dried at 120ºC and conducted with variations of pH that were 2, 5, 7, 8, 9, 10, and 13 in the wastewater to determine the optimum pH, continued by time variation of UV radiation for 1, 2, 4, 6, 8, 10, and 12 hours. The results showed that the largest percentage decrease in the concentration of cyanide occurs at pH 9 that is equal to 88.6361% and the largest percentage decrease in the concentration of cyanide by irradiation with UV light occurs after 10 hours irradiation, up to 93.7929%.Keyword: photocatalyst, cyanide, TiO 2 PENDAHULUANIndustri tapioka adalah salah satu industri yang berkembang pesat di Indonesia. Industri ini menghasilkan limbah padat dan cair. Limbah padat ini dapat dimanfaatkan untuk berbagai keperluan, seperti; limbah padat yang berasal dari proses pengupasan ketela pohon dari kulitnya yaitu berupa kotoran dan kulit serta pada waktu pemrosesan yang berupa ampas dimana sebagian besar berupa serat dan pati dapat dimanfaatkan sebagai makanan ternak, pupuk, bahan campuran saus, dan obat nyamuk bakar. Sedangkan Limbah cair yang dihasilkan dari proses pembuatan, baik dari pencucian bahan baku sampai pada proses pemisahan pati dari airnya dapat dimanfaatkan untuk minuman nata de cassava. Limbah industri tapioka yang mempunyai kandungan bahan organik yang tinggi, apabila tidak diolah dengan baik dan benar dapat menimbulkan berbagai masalah bagi kesehatan, misalnya: gatal-gatal, timbul bau yang tidak sedap, air limbah bila masuk ke dalam tambak akan merusak tambak sehingga ikan mati, estetika sungai berubah dan lain-lain (Wahyuadhy, 1996). Senyawa sianida adalah salah satu bahan organik yang terdapat dalam limbah tapioka yang merupakan suatu substansi yang sangat beracun bagi kehidupan makhluk hidup (Ariesyady, 1996). Sianida terdapat di alam yang secara alamiah memang ada ataupun menjadi ada karena kesengajaan dari manusia dalam memenuhi kebutuhan hidupnya. Menurut hasil pemeriksaan sifat fisika kimia contoh air limbah tapioka pada proses pengendapan pati di pabrik tapioka Desa Pancasan,

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Effect of formate and methanol on photoreduction/removal of toxic cadmium ions using TiO2 semiconductor as photocatalyst

Cited by 119 publications

References 34 publications

Study of the Efficiency of UV and Visible‐Light Photocatalytic Oxidation of Methanol on Mesoporous RuO₂–TiO₂ Nanocomposites

Study of the Efficiency of UV and Visible‐Light Photocatalytic Oxidation of Methanol on Mesoporous RuO₂–TiO₂ Nanocomposites

Removal of aqueous toxic Hg(II) by synthesized TiO2 nanoparticles and TiO2/montmorillonite

PENURUNAN KADAR SIANIDA DALAM LIMBAH CAIR TAPIOKA MENGGUNAKAN FOTOKATALIS TiO2

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Effect of formate and methanol on photoreduction/removal of toxic cadmium ions using TiO2 semiconductor as photocatalyst

Cited by 119 publications

References 34 publications

Study of the Efficiency of UV and Visible‐Light Photocatalytic Oxidation of Methanol on Mesoporous RuO2–TiO2 Nanocomposites

Study of the Efficiency of UV and Visible‐Light Photocatalytic Oxidation of Methanol on Mesoporous RuO2–TiO2 Nanocomposites

Removal of aqueous toxic Hg(II) by synthesized TiO2 nanoparticles and TiO2/montmorillonite

PENURUNAN KADAR SIANIDA DALAM LIMBAH CAIR TAPIOKA MENGGUNAKAN FOTOKATALIS TiO2

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Product

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Study of the Efficiency of UV and Visible‐Light Photocatalytic Oxidation of Methanol on Mesoporous RuO₂–TiO₂ Nanocomposites

Study of the Efficiency of UV and Visible‐Light Photocatalytic Oxidation of Methanol on Mesoporous RuO₂–TiO₂ Nanocomposites