A new process for the recovery of palladium from a spent Pd/TiO2 catalyst through a combination of mild acidic leaching and photodeposition on ZnO nanoparticles

Muscetta, Marica; Pota, Giulio; Vitiello, Giuseppe; Jitan, Samar Al; Palmisano, Giovanni; Andreozzi, Roberto; Marotta, Raffaele; Somma, Ilaria Di

doi:10.1039/d2re00240j

Cited by 4 publications

(6 citation statements)

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“…The synthesis of the photocatalyst is performed by following the procedure reported by Muscetta et al [28], in which the catalyst is completely characterized. A fixed amount of TiO2 (1500 mg) is mixed in the agate milling tank (PM100, RETSCH), with agate balls and a fixed amount of Cu2O (150 mg), fixing the rotation rate to 200 rpm and the milling time to 1 minute.…”

Section: Preparation Of the Photocatalystmentioning

confidence: 99%

“…Photocatalytic tests are performed as in [28] (see Figure 1 (A,B) for the schematic illustration of the experimental setup). The Supplemental materials also include a full explanation of the reactor.…”

Section: Photocatalytic Tests and Analytical Determinationmentioning

confidence: 99%

“…To evaluate the separate contribution of the UV and visible radiation ranges in hydrogen production, some photocatalytic runs are carried out by employing a cut-off filter to eliminate radiations with wavelengths less than 400 nm. Hydrogen estimation is carried out as reported elsewhere [28,30] The pH of the solution is measured using an Orion 420 p pH-meter (Thermo). The effect of the different parameters affecting the preparation stage of the photocatalyst in the presence of methanol was previously discussed [28].…”

Section: Photocatalytic Tests and Analytical Determinationmentioning

confidence: 99%

“…Hydrogen estimation is carried out as reported elsewhere [28,30] The pH of the solution is measured using an Orion 420 p pH-meter (Thermo). The effect of the different parameters affecting the preparation stage of the photocatalyst in the presence of methanol was previously discussed [28]. The influence of methanol concentration on the photocatalytic generation of hydrogen is herein explored.…”

Section: Photocatalytic Tests and Analytical Determinationmentioning

confidence: 99%

“…The heterojunction formation by combining TiO2 and Cu2O is a viable route to improve solar light utilization [24][25][26][27]. Among the different techniques reported in literature findings to prepare Cu2O/TiO2 composite material, a simple and industrially practicable ball milling procedure to dryness was selected as an alternate strategy for preparing photocatalysts in our recent study [28]. The results of the previous study allowed the selection of the best photocatalyst for hydrogen generation prepared by mixing Cu2O and TiO2 (i.e., 1%wt.…”

Section: Introductionmentioning

confidence: 99%

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Visible – Light Driven Systems: Effect of the Parameters Affecting Hydrogen Production through Photoreforming of Organics in Presence of Cu2O/TiO2 Nanocomposite Photocatalyst

Muscetta¹,

Clarizia²,

Race³

et al. 2023

Preprint

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Several studies have shown that combining TiO2 and Cu2O enhances the photocatalytic activity of the material by generating a heterojunction capable of extending the light absorption in the visible and reducing the electron-hole recombination rate. Ball milling has been chosen as an alternative methodology for photocatalyst preparation, among the several techniques documented in the literature review. The results of a previously reported investigation enabled the identification of the most effective photocatalyst that can be prepared for hydrogen generation by combining Cu2O and TiO2 (i.e., 1%wt Cu2O in TiO2 photocatalyst prepared by ball-milling method at 200 rpm and 1 min milling time). To optimize photocatalytic hydrogen generation in the presence of the greatest photocatalyst, the effects of (i) sacrificial species and their concentration, (ii) temperature, and (iii) pH of the system are taken into account, resulting in a light-to-chemical energy efficiency of 8% under the best-tested conditions. Last but not least, the possibility of using the present photocatalytic system under direct solar light irradiation is evaluated: the results indicate that nearly 60% of the hydrogen production recorded under sunlight can be attributed to the visible component of the solar spectrum, while the remaining 40% can be attributed to the UV component.

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Section: Preparation Of the Photocatalystmentioning

confidence: 99%

Section: Photocatalytic Tests and Analytical Determinationmentioning

confidence: 99%