Formulation and optimization of a novel TiO2/calcium alginate floating photocatalyst

Dalponte, Ithiara; Sousa, Bianca Cristina de; Mathias, Álvaro Luiz; Jorge, Regina Maria Matos

doi:10.1016/j.ijbiomac.2019.07.020

Cited by 49 publications

(16 citation statements)

References 33 publications

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“…XRD patterns showed a similarity of the composite aerogels' diffraction peaks to those of the pure TiO2, The preparation of aerogels with immobilized TiO 2 nanoparticles for wastewater remediation practices is an additional application of alginate salts. Exploring once again homogeneous dispersion and ionic crosslinking pathways, Dai et al [35] fabricated TiO 2alginate aerogels for oil/water separation. After the formation of hybrid sodium alginate-TiO 2 sol with the aid of ultra-sonication, the sol was freeze-dried, while the formed hybrid aerogel was immersed latter into a CaCl 2 solution for the cross-linking step.…”

Section: Or Peer Review 17mentioning

confidence: 99%

“…The irradiation was carried out under two main sources, UV light or sunlight for a time range between 45-340 min. Photocatalytic materials based on alginate showed a high recyclability with a range of 3-7 cycles [16,[33][34][35][36][37][38]. Furthermore, for the better understanding of the exporting photocatalytic results and merits of alginate matrix, selected studies are presented below.…”

Section: Photocatalytic Performancementioning

confidence: 99%

“…The observed high degradation efficiency was attributed to the excellent distribution of TiO 2 onto SAT aerogel structure. Moreover, the alginate substrate covered with photocatalyst was characterized as durable against photoinduced corrosion and it could be reused for six photocatalytic cycles [35].…”

Section: Photocatalytic Performancementioning

confidence: 99%

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Insights into Biodegradable Polymer-Supported Titanium Dioxide Photocatalysts for Environmental Remediation

et al. 2021

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During the past two decades, immobilization of titanium dioxide (TiO2), a well-known photocatalyst, on several polymeric substrates has extensively gained ground since it limits the need of post-treatment separation stages. Taking into account the numerous substrates tested for supporting TiO2 photocatalysts, the use of biodegradable polymer seems a hopeful option owing to its considerable merits, including the flexible nature, low price, chemical inertness, mechanical stability and wide feasibility. The present review places its emphasis on recently published research articles (2011–2021) and exhibits the most innovative studies facilitating the eco-friendly biodegradable polymers to fabricate polymer-based photocatalysts, while the preparation details, photocatalytic performance and reuse of the TiO2/polymer photocatalysts is also debated. The biodegradable polymers examined herein comprise of chitosan (CS), cellulose, alginate, starch, poly(lactid acid) (PLA), polycaprolactone (PCL) and poly(lactide-co-glycolide) (PLGA), while an emphasis on the synthetical pathway (dip-coating, electrospinning, etc.) of the photocatalysts is provided.

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Section: Or Peer Review 17mentioning

confidence: 99%

Section: Photocatalytic Performancementioning

confidence: 99%

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Insights into Biodegradable Polymer-Supported Titanium Dioxide Photocatalysts for Environmental Remediation

et al. 2021

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“…In the current work, alginate, a natural, stable gel-forming, linear biopolymer extracted from brown algae, was employed as template to develop novel structured photocatalytic systems in the shape of ceramic beads using commercially available photocatalysts via cross-linking technique. Alginate beads as supporting matrixes for photocatalysts are good candidates for cationic dye adsorption [ 14 , 17 ] and degradation [ 25 ], heavy metals and pigments removal [ 26 , 27 , 28 ], and release of effective antibacterial agents [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Engineering Commercial TiO2 Powder into Tailored Beads for Efficient Water Purification

et al. 2022

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In this study, efficient commercial photocatalyst (Degussa P25) nanoparticles were effectively dispersed and stabilized in alginate, a metal binding biopolymer. Taking advantage of alginate’s superior metal chelating properties, copper nanoparticle-decorated photocatalysts were developed after a pyrolytic or calcination-sintering procedure, yielding ceramic beads with enhanced photocatalytic and mechanical properties, excellent resistance to attrition, and optimized handling compared to powdered photocatalysts. The morphological and structural characteristics were studied using LN2 porosimetry, SEM, and XRD. The abatement of an organic pollutant (Methyl Orange, MO) was explored in the dark and under UV irradiation via batch experiments. The final properties of the photocatalytic beads were defined by both the synthesis procedure and the heat treatment conditions, allowing for their further optimization. It was found that the pyrolytic carbon residuals enabled the adhesion of the TiO2 nanoparticles, acting as binder, and increased the MO adsorption capacity, leading to increased local concentration in the photocatalyst vicinity. Well dispersed Cu nanoparticles were also found to enhance photocatalytic activity. The prepared photocatalysts exhibited increased MO adsorption capacity (up to 3.0 mg/g) and also high photocatalytic efficiency of about 50% MO removal from water solutions, reaching an overall MO rejection of about 80%, at short contact times (3 h). Finally, the prepared photocatalysts kept their efficiency for at least four successive photocatalytic cycles.

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“…Moreover, buoyant immobilization material is highly desirable for applications with sunlight as the irradiation source. 3,[12][13][14] Therefore, novel supporting materials with intensied adhesion of catalysts, super adsorption capacity, and controllable interconversion between buoyancy and suspension are needed for versatile applications of photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Immobilizing a visible light-responsive photocatalyst on a recyclable polymeric composite for floating and suspended applications in water treatment

Mehmood

Zhong

Zhou³

et al. 2020

RSC Adv.

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Formulation and optimization of a novel TiO2/calcium alginate floating photocatalyst

Cited by 49 publications

References 33 publications

Insights into Biodegradable Polymer-Supported Titanium Dioxide Photocatalysts for Environmental Remediation

Insights into Biodegradable Polymer-Supported Titanium Dioxide Photocatalysts for Environmental Remediation

Engineering Commercial TiO2 Powder into Tailored Beads for Efficient Water Purification

Immobilizing a visible light-responsive photocatalyst on a recyclable polymeric composite for floating and suspended applications in water treatment

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