Experimental analysis of a photoreactor packed with Pd‐BiVO₄‐Coated glass beads

Abstract

A photoreactor packed with glass beads coated by palladium nanoparticles-modified BiVO 4 was tested and analyzed in phenol degradation under UV-Visible light. The photocatalytic activity of Pd-BiVO 4 under visible light is higher than TiO 2 under UV light, as we previously reported. In this work, we try to use the Pd-BiVO 4 in a large scale by coating the glass beads with it, a potentially industrial-scale use. For comparison, a flat-plate reactor and a slurry reactor were also examined. The photocatalytic activity of Pd-BiVO 4 in phenol degradation was found to be higher than that of TiO 2 in all systems (slurry, flat-plate, and packed beads reactor [PBR]). Furthermore, PBR exhibited higher energy efficiency compared to the flat-plate reactor in phenol oxidation. The superior performance of this reactor is due primarily to the highly exposed catalyst surface area, high mass transfer coefficient, and effective delivery of both photons and reactants to the catalyst surfaces.

Recent Advances of Photocatalytic Application in Water Treatment: A Review

“…The reactor has sufficient stability, high photocatalytic activity, long-term durability, regeneration and reusability, and easy separation. Meng et al [108] designed a palladium-vanadium tetroxide glass bead-filled photoreactor, which is 132% faster than the flat plate reactor and more energy efficient in the photocatalytic degradation of phenol. The excellent performance of the reactor is mainly attributed to the highly exposed catalyst surface area, high mass transfer coefficient and the effective transfer of photons and reactants to the catalyst surface, but the cost of the reactor is much higher than TiO2.…”

“…Uniformly morphological and oriented TiO2 nanowires on the Ti substrate were prepared by one-step hydrothermal synthesis, which can be recyclable without secondary pollution. Rahmani et al [110] prepared TiO2/SiO2 thin films by a sol-gel method, which were coated on the inner wall of the outer shell of the Meng et al [108] designed a palladium-vanadium tetroxide glass bead-filled photoreactor, which is 132% faster than the flat plate reactor and more energy efficient in the photocatalytic degradation of phenol. The excellent performance of the reactor is mainly attributed to the highly exposed catalyst surface area, high mass transfer coefficient and the effective transfer of photons and reactants to the catalyst surface, but the cost of the reactor is much higher than TiO 2 .…”

Removal of 1-naphthol from Water via Photocatalytic Degradation Over N,S-TiO2/ Silica Sulfuric Acid under visible Light

“…Many studies report that the TiO 2 photocatalysts are immobilized on surfaces such as glass Microspheres (MS) [22,23], silica [24], zeolites, and nanotubes because of problems such as repetitive mixing throughout work, the expensive filtration and centrifugation of solutions for catalyst recovery, nanoparticles dispersion in solution and blockage of light, and the like. In the literature, the use of glass beads for catalyst deposition has been of considerable interest [25,26]. In this study, the new catalyst N, S-TiO 2 coated on Silica Sulfuric Acid (SSA) was prepared.…”

An intrinsic kinetic model for liquid‐phase photocatalytic hydrogen production

“…Photocatalytic reactions have been considered as a promising alternative for future chemical conversion, since the discovery of water photolysis on a TiO 2 electrode by Fujishima and Honda . Titanium‐based photocatalysts are the most recognized and alternative photocatalysts are not still reliable due to issues such as their stability, cost, toxicity, availability, and activity under full solar spectrum . Deposition of cocatalysts on semiconductor is one of the best‐known approaches to increase the efficiency of photocatalysts and platinum is the most common cocatalyst for hydrogen production .…”

“…8 Photocatalytic reactions have been considered as a promising alternative for future chemical conversion, since the discovery of water photolysis on a TiO 2 electrode by Fujishima and Honda. 9 Titanium-based photocatalysts are the most recognized [10][11][12][13] and alternative photocatalysts are not still reliable due to issues such as their stability, cost, toxicity, availability, and activity under full solar spectrum. 14…”