Sonochemical/hydration—dehydration synthesis of Pt—TiO2 NPs/decorated carbon nanotubes with enhanced photocatalytic hydrogen production activity

Abdulrazzak, Firas H.; Hussein, Falah H.; Alkaim, Ayad F.; Ivanova, I. I.; Emeline, Alexei V.; Bahnemann, Detlef W.

doi:10.1039/c6pp00240d

Cited by 48 publications

(12 citation statements)

References 68 publications

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“…Moreover, no activity for the H 2 evolution was observed during the illumination of pristine and platinized TiO 2 in the absence of naphthalene. This can be assigned to the fast recombination of the photogenerated charge carriers in the absence of a suitable hole scavenger, i.e., naphthalene, and the presence of an overpotential in the production of H 2 on the surfaces of the pristine photocatalysts [22].…”

Section: Photocatalytic Reforming Of Naphthalenementioning

confidence: 99%

“…Loading the surface of TiO 2 with noble metals, in particular, platinum (Pt) nanoparticles, plays an essential role in enhancing the photocatalytic conversion process [4,20]. Interestingly, Pt nanoparticles on the surface of TiO 2 act as electron acceptors for the accumulated electrons, enhancing the formation of molecular hydrogen by reducing the overpotential of proton reduction [4,21,22].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic H2 Production from Naphthalene by Various TiO2 Photocatalysts: Impact of Pt Loading and Formation of Intermediates

et al. 2021

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This work presents a comparative study of the efficiency of two commercial TiO2 photocatalysts, Aeroxide P25 (ATiO2) and Sachtleben Hombikat UV100 (HTiO2), in H2 production from an aqueous solution of naphthalene. The TiO2 photocatalysts were platinized by the photodeposition method varying the platinum content of the suspension to 0.5, 1.0, and 5.0 wt%. A full physicochemical characterization for these materials was performed, showing no structural effects from the deposition method, and confirming a well dispersion of nanosized-Pt0 particles on the surface of both photocatalysts. Pristine ATiO2 shows around 14% higher photocatalytic fractional conversion of naphthalene than pristine HTiO2 after 240 min of irradiation, while both materials exhibit negligible activity for H2 formation. The 0.5 wt% Pt- HTiO2 increases the photocatalytic fractional conversion of naphthalene from 71% to 82% and produces 6 µmol of H2. However, using a higher Pt content than the optimal platinization ratio of 0.5 wt% dramatically inhibits both processes. On the other hand, regardless of the fractional ratio of Pt, the platinization of ATiO2 results in a decrease in the fractional conversion of naphthalene by 4% to 33% of the pristine value. Although the presence of Pt islands on the surface of the ATiO2 is essential for the H2 evolution, no dependency between the Pt ratio and the H2 formation rate was observed since all the platinized materials show a similar H2 formation of around 3 µmol. Based on the EPR results, the higher photocatalytic activity of the Pt-HTiO2 is attributed to the efficient charge carrier separation and its larger surface area. The recyclability test confirms that the inhibition of the photocatalytic process is related to the deactivation of the photocatalyst surface by the adsorption of the photoformed intermediates. A strong relationship between the photocatalytic activity and the kind of the aromatic compounds was observed. The H2 evolution and the photooxidation of the aromatic hydrocarbons exhibit higher photonic efficiencies than that of their corresponding hydroxylated compounds over the Pt-HTiO2.

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Section: Photocatalytic Reforming Of Naphthalenementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic H2 Production from Naphthalene by Various TiO2 Photocatalysts: Impact of Pt Loading and Formation of Intermediates

et al. 2021

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“…SDT has shown great potential to remove proliferative scars, kill pathogenic microorganisms, as well as remarkable efficacy in treating solid tumors, leukemia, and atherosclerosis [ 357 , 358 , 359 ]. Considerable effort has been made to explore MSN applications in synthesizing more effective sonosensitizers, for example, the TiO 2 MSNs chelated with heavy metals Au, Pt, or Ag [ 360 , 361 , 362 ]. Another method commonly used to produce sufficient ROS for tumor growth suppression is the cavitation-inducible sono-theragnostic MSNs.…”

Section: Update On Msn Applications In Nanomedicinesmentioning

confidence: 99%

An Update on Mesoporous Silica Nanoparticle Applications in Nanomedicine

et al. 2021

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The efficient and safe delivery of therapeutic drugs, proteins, and nucleic acids are essential for meaningful therapeutic benefits. The field of nanomedicine shows promising implications in the development of therapeutics by delivering diagnostic and therapeutic compounds. Nanomedicine development has led to significant advances in the design and engineering of nanocarrier systems with supra-molecular structures. Smart mesoporous silica nanoparticles (MSNs), with excellent biocompatibility, tunable physicochemical properties, and site-specific functionalization, offer efficient and high loading capacity as well as robust and targeted delivery of a variety of payloads in a controlled fashion. Such unique nanocarriers should have great potential for challenging biomedical applications, such as tissue engineering, bioimaging techniques, stem cell research, and cancer therapies. However, in vivo applications of these nanocarriers should be further validated before clinical translation. To this end, this review begins with a brief introduction of MSNs properties, targeted drug delivery, and controlled release with a particular emphasis on their most recent diagnostic and therapeutic applications.

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“…For instance, TiO 2 NPs have been modified by the chelation of heavy metals, including Au, Pt, and Ag. [ 21–23 ] Nevertheless, there have been no studies on developing TiO 2 NPs capable of amplifying cavitation by using the exogenous energy.…”

Section: Introductionmentioning

confidence: 99%

Cavitation‐Inducible Mesoporous Silica–Titania Nanoparticles for Cancer Sonotheranostics

Lee

Kim

You

et al. 2020

Adv Healthcare Materials

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Sonodynamic therapy has received increasing attention for cancer treatments as an alternative to photodynamic therapy. However, its clinical applications have been limited by the lack of a sonosensitizer that is capable of producing sufficient amounts of reactive oxygen species (ROS) in response to ultrasound (US) exposure. Herein, PEGylated mesoporous silica-titania nanoparticles (P-MSTNs) are prepared and used as US-responsive nanocarriers for cancer sonotheranostics. Perfluorohexane (PFH), which is chosen as the gas precursor, is physically encapsulated into P-MSTNs using the oil-in-water emulsion method.

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Sonochemical/hydration—dehydration synthesis of Pt—TiO2 NPs/decorated carbon nanotubes with enhanced photocatalytic hydrogen production activity

Cited by 48 publications

References 68 publications

Photocatalytic H2 Production from Naphthalene by Various TiO2 Photocatalysts: Impact of Pt Loading and Formation of Intermediates

Photocatalytic H2 Production from Naphthalene by Various TiO2 Photocatalysts: Impact of Pt Loading and Formation of Intermediates

An Update on Mesoporous Silica Nanoparticle Applications in Nanomedicine

Cavitation‐Inducible Mesoporous Silica–Titania Nanoparticles for Cancer Sonotheranostics

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