Infinity Supercritical

Supercritical Fluid Extraction Search Engine - Infinity Supercritical CO2 Extraction Publications Search Engine - Cannabis Industry - Publications On Demand - Real Time Browser Display

This SDR - Spinning Disc Reactor and Cavitation Reactor search was updated real-time via Filemaker on:

SDR - Spinning Disc Reactor and Cavitation Reactor Contents List

Previous Page View | Next Page View

Search Completed. Publication Name:


Page Number: 001

PDF Text:

7th ECCOMAS Thematic Conference on Smart Structures and Materials SMART 2015 A.L. Araújo, C.A. Mota Soares, et al. (Editors) © IDMEC 2015


Jakub Tolasz, Petr Vomáčka, Václav Štengl and Jana Bludská

Department of Materials Chemistry, Institute of Inorganic Chemistry AS CR v.v.i, Husinec-Rež, Czech Republic

Key words: Titanium oxide, Graphene, Graphene oxide, Preparation, Photocatalysis.

Summary: Titanium(IV) oxide - graphene [1] or graphene oxide nano composite [2] were prepared by one-pot thermal hydrolysis of suspension graphene or graphene oxide nanosheets and titanium oxide in three different forms as a starting materials. Graphene nanosheets were produced in a large quantity from natural graphite using a high intensity cavitation field in a pressurized ultrasonic reactor [3]. The graphene oxide was prepared by improved Hummers method [4]. The direct interaction between TiO2 nanoparticles and graphene sheet prevents the re-agregation of the exfoliated sheets of graphene. Graphene and even graphene oxide has the ability to locally reduce the titanium to active form of Ti3+ ion. The grapheme nanosheets make Ti3+ ions stable in the TiO2 matrix and form a heterojunction system with titania.

The better photocatalytic properties on the TiO2-graphene oxide nanocomposite systems irrespective of light sources could be attributed to synergy effects including the increase in specific surface area with graphene oxide amount. As well as to the formation of both π–π conjugations between organic pollutants molecules and graphene skeleton and the ionic interactions between organic pollutants and oxygen-containing functional groups at the edges or on the surfaces of graphene based nanosheets. Graphene oxide works as the adsorbent, electron acceptor and photosensitizer and efficiently enhances the organic pollutants photodecomposition.

First preparation method of titanium oxide utilized thermal homogeneous hydrolysis by urea or hydrazine monohydrate. Second method used the peroxo-complex of titania as an intermediate. All these methods have own specifications and limitations. Each method provides a various morphologies and size of primary particles and aggregates with significant effects on the photocatalytic activity.

The prepared a series of samples were characterized by surface area (BET) and porosity (BJH) determination, X-ray diffraction (XRD), infrared and Raman spectroscopy (IR, RS), scanning and transmission electron microscopy (SEM, TEM) (Fig.1). UV-VIS diffuse reflectance spectroscopy was employed to estimate the band gap energies. The relative photocatalytic activity of the as-prepared thin layers of titania-graphene and titania-graphene oxide nanocomposite in poly(hydroxyethyl methacrylate) was assessed by the photocatalytic decomposition of OrangeII under UV and visible light.

PDF Image:

 Supercritical Fluid Extraction SMART2015_122.pdf Page 001
SUPERCRITICAL CO2 EXTRACTOR FOR SALE: 5L, 10L and 20L - 2,000 psi Complete Supercritical Fluid Extraction System - closed loop. Our systems are made at our fabrication shop in the state of Washington. Systems available: 5L, 10L, 20L, 100L, and larger custom. Typical build time is 2 weeks. This is not a Apeks Supercritical or Waters Supercritical CO2 Fluid Extraction System. We believe it is a better system, since we use 1/2 inch tubing for the CO2 flow, which is 4 times the flow rate of a Apeks, and up to 64 times the flow rate of a Waters system. We believe the result is faster processing time and better yield from increased exposure to CO2 solvent. Perfect for extraction of terpenes, trichomes, and Cannabinoids. Supercritical CO2 Fluid Extraction is a art, and the operator must have experience and training to obtain results. Go to website

Search Engine Contact: