Activated carbon xerogel–chitosan composite materials for catalytic wet peroxide oxidation under intensified process conditions

Pinho, Mónica Morado; Silva, Adrián M.T.; Fathy, Nady A.; Attia, A. A.; Gomes, Helder; Faria, Joaquim L.

doi:10.1016/j.jece.2014.10.020

Cited by 27 publications

(5 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The CWPO of 4-NP in aqueous medium was carried out in a 250 mL well-stirred glass reactor maintained at 323 K. The reactor was loaded with 100 mL of a concentrated (5.0 g/L) 4-NP aqueous solution, considered as a model system to simulate high-loaded wastewaters [2,[23][24][25]. The initial pH of the solution was adjusted to 3 by adding H 2 SO 4 and NaOH solutions (not buffered).…”

Section: Catalytic Runsmentioning

confidence: 99%

Pillared clays from natural resources as catalysts for catalytic wet peroxide oxidation: Characterization and kinetic insights

Kalmakhanova

Tuesta

Massalimova

et al. 2019

Environmental Engineering Research

View full text Add to dashboard Cite

Pillared clays with Zr and Fe/Cu/Zr polycations have been prepared from natural clays found in large deposits of Kazakhstan and assessed as catalysts for the catalytic wet peroxide oxidation (CWPO), using 4-nitrophenol (4-NP) as model compound. The performance of the catalysts was followed by measuring the concentration of 4-NP, H2O2 and the total organic carbon (TOC), considering C4-NP = 5 g L-1 , CH 2 O 2 = 17.8 g L-1 , Ccat = 2.5 g L-1 , initial pH = 3.0 and T = 50°C. At those selected conditions, the pillared clays showed higher activity than natural clays in the CWPO of 4-NP. The conversion of the model pollutant was complete when Fe/Cu/Zr-PILCs were used, with the TOC removal reaching 78.4% after 24 h with the best Fe/Cu/Zr-PILC. The H2O2, 4-NP and TOC time-evolution was well described by a kinetic model based on TOC lumps in three blocks, considering the initial TOC (corresponding to 4-NP), the production of oxidizable intermediates and the formation of refractory products.

show abstract

Section: Catalytic Runsmentioning

confidence: 99%

Pillared clays from natural resources as catalysts for catalytic wet peroxide oxidation: Characterization and kinetic insights

Kalmakhanova

Tuesta

Massalimova

et al. 2019

Environmental Engineering Research

View full text Add to dashboard Cite

show abstract

“…chelate formation) and electrostatic interactions (creation and substitution of ions) which in turn depend on the kind of metal ion used, its chemical nature, and the pH of the solution. ACXs-chitosan composite synthesized as reported by Pinho et al for the eradication of orange II (O II) dye via adsorption and CWPO with the highest adsorption, removing O II between 69 and 73% after 150 min …”

Section: Different Forms Of Carbon Xerogels and Their Application In ...mentioning

confidence: 99%

“…By conveniently choosing the different conditions of synthesis, mainly governed by the resorcinol/catalyst molar ratio, the xerogels extracted after drying and pyrolysis showed larger specific surface areas and sizable pore volumes, irrespective of the drying techniques involved. Biopolymer-based xerogels derived from chitin and chitosan, , starch, or cellulose, , are the basis of green methods of effluent treatment for the removal of heavy metal ions and dyes, even at low concentrations. Carbonized xerogels or their incorporated carbon xerogels formed by continuous pyrolysis at 500–700 °C, without the presence of inert gases, developed superb adsorbent carbon xerogels .…”

Section: Introductionmentioning

confidence: 99%

Carbon Xerogels for Effluent Treatment

Pillai

Kandasubramanian

2020

J. Chem. Eng. Data

View full text Add to dashboard Cite

The adsorption process of carbonized xerogels in the form of porous microspheres or monoliths was found to be reversible. This indicated that the xerogels could be reusable, making the process of effluent treatment in eradicating metal ions and reactive dyes cost-effective and propitious. With the outburst of several kinds of water-borne epidemics, concern for effluent treatment has become a more significant factor in the design of new advanced treatment technologies. Consequently, some higher levels of effluent treatments assisted with more advanced materials were able to remove all pollutants from sewage; in contrast, their exorbitant mechanisms created hurdles in a long term perspective. Carbon and its diverse types, such as nanotubes, activated forms, and graphene oxide-incorporated carbon gels, were all studied, and their adsorption of different metal ions, the catalytic reduction, and adsorption of reactive dyes were mentioned concisely. Carbon xerogels possess very low densities (0.04–1.3) g/cm3, micromesoporous size (<50 nm), and large surface areas (600–800) m2/g, and due to their most straightforward route of preparation and high microporous fractions, about 80% during carbonization, they are more preferred over other gels. This review paper discusses the synthesis of xerogels, carbonization processes, various carbon incorporated xerogels, appropriate adsorption isotherms, and the kinetic models they follow, and their efficacies in effluent treatment.

show abstract

“…However, due to the leaching phenomenon, these catalysts mainly suffer from limited stability [28,30]. On the other hand, carbon materials with easily tuned properties, like activated carbons [20,30,31], graphite and graphene-based materials [32,33], activated carbon xerogels [11,21,34], carbon blacks [33], glycerolbased carbon materials [35] and carbon nanotubes (CNTs) [36], have been used as active and efficient catalysts for degradation of pollutants by CWPO, however with lower efficiency compared to metal based catalysts [23]. Among the reported supported catalysts, nanomaterials such as CNTs have attracted attention due to their unique and interesting properties, important for superior catalyst support materials, including their distinctive tubular structure, low mass-transfer limitations, high mechanical strength, superior electrical properties, large specific surface area and relatively high thermal stability in oxidizing conditions [23,36,37].…”

Section: Introductionmentioning

confidence: 99%

Magnetic titanium/carbon nanotube nanocomposite catalyst for oxidative degradation of Bisphenol A from high saline polycarbonate plant effluent using catalytic wet peroxide oxidation

Mirzaee

Jaafarzadeh

Gomes

et al. 2019

Chemical Engineering Journal

Self Cite

View full text Add to dashboard Cite

The saline polycarbonate wastewater was treated by catalytic wet peroxide oxidation. • The magnetite TNT/CNT nanocomposite was developed as CWPO catalyst. • The complete BPA, 68.78% of COD and 47.14% of TOC reduction was obtained in CWPO. • The reusability of the catalyst shows with slight decline after 4 consecutive runs. • The biodegradability of treated PCW using CWPO process was improved significantly.

show abstract

Activated carbon xerogel–chitosan composite materials for catalytic wet peroxide oxidation under intensified process conditions

Cited by 27 publications

References 37 publications

Pillared clays from natural resources as catalysts for catalytic wet peroxide oxidation: Characterization and kinetic insights

Pillared clays from natural resources as catalysts for catalytic wet peroxide oxidation: Characterization and kinetic insights

Carbon Xerogels for Effluent Treatment

Magnetic titanium/carbon nanotube nanocomposite catalyst for oxidative degradation of Bisphenol A from high saline polycarbonate plant effluent using catalytic wet peroxide oxidation

Contact Info

Product

Resources

About