Highly efficient removal of toxic organic dyes, chemical solvents and oils by mesoporous exfoliated graphite: Synthesis and mechanism

Exfoliated graphite (EG) has been receiving much global attention in the last decade because of the growing number of potential applications. However, the production of EG has several disadvantages such as, requiring more than one chemical compound, consuming more chemical quantity, time and energy, etc. Here, we report a simple low cost one compound based rapid and efficient production of EG using microwave irradiation technique. As prepared EG material shows multifunctional outstanding performance including adsorption of various toxic organic dyes and absorption of various organic solvents, as well as, oils. The maximum adsorption capacity reaches 384.6 (+/- 10.2), 222.32 (+/- 8.6), 151.51 (+/- 9.2) and 196.08 (+/- 5.4) mg/g for malachite green (MG), methylene blue (MB), rhodamine 6 g (Rh6 g) and congo red (CR) dyes at equilibrium. It shows an efficient flow through filtration of dye contaminated water, showing potential as the best technique for industrial waste water treatment. It absorbs 40-120 g of various chemical solvents and oils per one gram of EG. To the best of our knowledge, this is the first report on single compound based rapid and efficient synthesis of EG in about one minute with multifunctional outstanding application performance

Exfoliation of graphite as flexible SERS substrate with high dye adsorption capacity for Rhodamine 6G

Adsorption is one of the most important processes in wastewater treatment, especially for dye removal. In addition to adsorption, there must be a vigilant technique, such as Surface Enhanced Raman spectroscopy (SERS), for detection of low concentration of dye molecules to detect water foiling. Herein, we report a simple, low cost, rapid and efficient technique for the production of exfoliated graphite (EG) under microwave irradiation at 800 W in 1 min, as excellent adsorption material for Rhodamine 6G (R6G) dye. The effect of adsorption process parameters such as pH, contact time, isotherm models (Langmuir and Freundlich) and kinetic models (pseudo-first and pseudo-second-order) on dye removal under aqueous solutions, were investigated. The maximum adsorption capacity for R6G dye is 212.72 (+/- 5.3) mg/g. Meanwhile compressing of EG, into a flexible graphite sheet (FGS) demonstrates responsive SEAS for R6G molecules up to detection limit of 10(-7) mol/L. However, with silver nanoparticle incorporation, the detection limit increases up to 10(-)(12) mol/L. Performance of flexible sheet checked over a month by rubbing sheet through paper and cloth doesn't have any impact on the synthesis of exfoliated graphite. Aging factor of the sheet also shows reproducible SEAS spectra after a month. These are the highest reported values fill today, for adsorption of R6G dye on Exfoliated graphite, with reasonable SEAS detection

The Children's Home Finder

Monthly newspaper published by the Oklahoma and Indian Territory Children's Home Society in Guthrie, Okla. The paper "seeks to save the orphans and other dependent children and make useful citizens of them, by placing them in select family homes with moral, educational and Christian advantages." Included are articles and editorials relating to children and adoption, along with advertising