Improving Effect of MnO&lt;sub&gt;2&lt;/sub&gt; Addition on TiO&lt;sub&gt;2&lt;/sub&gt;-Photocatalytic Removal of Lead Ion from Water

Kobayashi, Yasukazu; Kanasaki, Ryo; Nozaki, Takashi; Shoji, Ryo; Sato, Kazunori

doi:10.2965/jwet.16-021

Cited by 9 publications

(5 citation statements)

References 19 publications

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“…That is why the photocatalytic activity of the macroporous CeO2 with ZnO was increased compared to that of CeO2 only. Comparing an our previous study [7], the ZnO loaded macroporous CeO2 shows higher performance for removing lead ions than TiO2 photocatalysts, though the BET surface area of them are almost same. Figure 8 shows the amount of zinc ions dissolved against the amount of removed lead ions.…”

Section: Removal Of Lead Ionscontrasting

confidence: 47%

“…(1) Template method, and (2) Impregnation method [7,8]. In the template method, macroporous cerium oxides were prepared by the template method, using commercial silica microspheres (Sciqas Series, Sakai Chemical Industry Co. Ltd.) as a template material.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…Generally, photocatalytic activity can be increased by good crystallinity, large specific sur-face area and the addition of materials such as metal oxides. In our previous studies, we reported that macroporous TiO2 which has various pore sizes was prepared by PMMAtemplating method, and the highest activity was shown with possessing the smallest pore size and highest surface area among the various-sized photocatalysts and the addition of MnO2 onto the porous TiO2 accelerated the photocatalytic oxidation of Pb(II) ions [6] [7]. However, it is necessary to improve the photocatalytic activity for practical usages such as water treatment.…”

Section: Introductionmentioning

confidence: 99%

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Feasibility of Macroporous CeO2 Photocatalysts for Removal of Lead Ions from Water

Nozaki

Shoji

Kobayashi

et al. 2017

Bull. Chem. React. Eng. Catal.

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Removal of lead ions from water was conducted by a coupling approach of adsorption and photoelectrodeposition over a macroporous CeO2 photocatalyst loaded with ZnO. The photocatalyst was prepared by the hard template method and the impregnation method. The various size of silica spheres (0.05-0.4 µm) were used as a template for the photocatalyst, and the highest BET surface area (73.8 m 2 /g) was given in the sample prepared with the smallest silica sphere (0.05 µm). In the removal of lead ions, the porous sample showed a large amount of removal of lead ions. In addition, the ZnO loaded catalysts showed a larger amount of removal for lead ions than an unloaded catalyst under the UV light irradiation. In the reaction, since zinc ions were simultaneously dissolved to the solution, it was suggested that this reaction was the ion-exchange reaction between lead ions and zinc ions and was promoted by the UV light irradiation.

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Section: Removal Of Lead Ionscontrasting

confidence: 47%

Section: Catalyst Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Feasibility of Macroporous CeO2 Photocatalysts for Removal of Lead Ions from Water

Nozaki

Shoji

Kobayashi

et al. 2017

Bull. Chem. React. Eng. Catal.

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“…The inclusion of MnO 2 alongside TiO 2 remarkably enhanced the elimination of Pb 2+ ions, despite a reduction in surface area. This alteration fostered appealing interactions between the dopant and ions, resulting in heightened ion adsorption by the photocatalyst [248]. Furthermore, the elimination of heavy metals present in nuclear wastes, like Cs + and Sr 2+ , was achieved through doping titanium dioxide nanotubes with chromium ions.…”

Section: Tio 2 -Based Photocatalysts For Effective Elimination Of Hea...mentioning

confidence: 99%

Photocatalytic TiO2-Based Nanostructures as a Promising Material for Diverse Environmental Applications: A Review

Gatou,

Syrrakou,

Lagopati

et al. 2024

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Contemporary technological and industrial advancements have led to increased reliance on chemicals for product innovation, leading to heightened contamination of water sources by traditional pollutants (organic dyes, heavy metals) and disease-causing microorganisms. Wastewater treatment processes now reveal “emerging pollutants”, including pharmaceuticals, endocrine disruptors, and agricultural chemicals. While some are benign, certain emerging pollutants can harm diverse organisms. Researchers seek cost-effective water purification methods that completely degrade pollutants without generating harmful by-products. Semiconductor-based photocatalytic degradation, particularly using titanium dioxide (TiO2), is popular for addressing water pollution. This study focuses on recent applications of TiO2 nanostructures in photocatalysis for eliminating various water pollutants. Structural modifications, like doping and nanocomposite formation, enhance photocatalyst performance. The study emphasizes photocatalytic elimination mechanisms and comprehensively discusses factors impacting both the mechanism and performance of nano-TiO2-based photocatalysts. Characteristics of TiO2, such as crystal structure and energy band-gap, along with its photocatalytic activity mechanism, are presented. The review covers the advantages and limitations of different TiO2 nanostructure production approaches and addresses potential toxicity to human health and the environment. In summary, this review provides a holistic perspective on applying nano-TiO2 materials to mitigate water pollution.

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“…The Mn-2p peaks may be weak, but contributions from higher oxidations states clearly distinguish. The fact that these peaks appear in the spectrum, confirms the photocatalytic phenomenon and furthermore the use of the devices not only as sensors but also as devices for oxidation and deactivation of heavy metal ions [7,105,[110][111][112][113][114]. Both bare catalysts (TiO2 and TiOxNy) are active in capturing Mn 2+ ions from the solution and transforming them to stable Mn 3+ and Mn 4+ deposits.…”

Section: Photocatalytic Runsmentioning

confidence: 74%

Development and self - assembly of plasmonic particles for applications in molecular sensors

Pliatsikas¹

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Σκοπός της διατριβής ήταν η μελέτη, ανάπτυξη, μορφοποίηση με αυτό-οργάνωση και ο χαρακτηρισμός πλασμονικών νανοδομών, δηλαδή νανοσωματιδίων μετάλλων, και συσκευών για οπτικές και φωτονικές εφαρμογές. Συγκεκριμένα, στην παρούσα διδακτορική διατριβή αναπτύχθηκαν και μελετήθηκαν συστήματα νανοδομών από μεταλλικά νανοσωματίδια αργυρού και χρυσού ανεπτυγμένα πάνω σε υποστρώματα πυριτίου και τιτανίας. Η ανάπτυξη των μεταλλικών νανοσωματιδίων έγινε: (α) με χημικές μεθόδους όπως η Ηλεκτρολυτική Εναπόθεση Μετάλλου, μία γρήγορη και επαναλήψιμη χαμηλού κόστους διαδικασία, και (β) με φυσικές μεθόδους εναπόθεσης ατμών, όπως η Ιοντοβολή Εκκένωσης Αίγλης για την ανάπτυξη αρχικά λεπτών υμενίων μετάλλων και στην συνεχεία τον σχηματισμό των μεταλλικών νανοσωματιδίων με ανόπτηση με τη χρήση παλμικού λέιζερ, η οποία μας επέτρεψε να δημιουργήσουμε νανοσωματίδια διαφορετικών μεγεθών και κατανομών που εμφανίζουν το φαινόμενο του Τοπικού Επιφανειακού Πλασμονικού Συντονισμού σε συχνότητες που καλύπτουν όλο το φάσμα του ορατού φωτός. Οι πλασμονικές νανοδομές δοκιμάστηκαν επιτυχώς για την καταλληλότητα τους στην ανίχνευση και παγίδευση χαμηλής συγκέντρωσης μορίων ροδαμίνης ως υποστρώματα επιφανειακής ενίσχυσης σκέδασης Ράμαν μέσω της Φασματοσκοπίας Ράμαν και σε πειράματα Επιφανειακής Ενίσχυσης Φωταύγειας. Επιπροσθέτως, αναπτύχθηκαν πλασμονικές νανοδομές στην επιφάνεια τροποποιημένης τιτανίας και ελέγθηκε η απόδοσής τους στην φωτοκαταλυτική ανίχνευση και παγίδευση ιόντων βαρέων μετάλλων (ιόντων μαγγανίου), και επιτεύχθηκε η αύξηση της απόδοσης, ώστε η διαδικασία αυτή να επιτυγχάνεται με την χρήση απλών οικιακών λαμπτήρων τύπου φωτοδιόδου σε μικρό χρονικό διάστημα κατάλληλο για τη χρήση τους στη βιομηχανία.

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Improving Effect of MnO<sub>2</sub> Addition on TiO<sub>2</sub>-Photocatalytic Removal of Lead Ion from Water

Cited by 9 publications

References 19 publications

Feasibility of Macroporous CeO2 Photocatalysts for Removal of Lead Ions from Water

Feasibility of Macroporous CeO2 Photocatalysts for Removal of Lead Ions from Water

Photocatalytic TiO2-Based Nanostructures as a Promising Material for Diverse Environmental Applications: A Review

Development and self - assembly of plasmonic particles for applications in molecular sensors

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