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Green Synthesis of Carbon Nanotubes
Published in Soney C. George, Jacob Philip, Ann Rose Abraham, A. K. Haghi, Carbon Nanotubes for Energy and Environmental Applications, 2023
K. C. Nimitha, Jiji Abraham, Arunima Reghunadhan, Soney C. George, Sabu Thomas
Poultry feather is an abundant and inexpensive source of carbon and can be used for the synthesis of doped CNTs. Nowadays, poultry feathers are deposited in landfills without proper waste management. This will lead to environment problems. Efficient utilization of these waste materials can give astounding results. Chicken feathers can be effectively used for the synthesis of N-doped CNTs. Chicken feathers are good source of nitrogen too. In super critical carbon dioxide systems, chicken feathers are dissociated to simple molecules and the process resembles the CVD method. Here, when we use a transition metal catalyst like Ni, N-doped CNTs are formed. Usually, nickel acetate tetrahydrate is used as the precursor for Ni and when it enters the system, this will decompose to form Ni nanoparticles.25Figure 11.11 represents the whole process by which N-doped CNTs are prepared from chicken feathers.
Synthesis of Mn/NiO and Mn/BiOCl nanoparticles for degradation of Nile blue dye contaminated water under visible light illumination
Published in Particulate Science and Technology, 2020
Bhawna Sarwan, Brijesh Pare, A. D. Acharya
Neat and Mn/NiO samples were synthesized by chemical precipitation. In this process, 0.1 M of nickel acetate tetrahydrate (Ni(CH3COO)2·4H2O) was dissolved in 100 ml of distilled water under vigorous stirring to obtain Ni(OH)2. Precipitates were successfully formed when the pH value of the solution was adjusted between 8 and 12 with NaOH. The obtained precipitates were collected and washed with distilled water and also with absolute ethanol several times then dried at 120 °C for 12 h. Further, the light green colored nickel oxide was obtained by calcining the dried precipitate at 500 °C for 1 h. Mn-doped NiO particles were prepared in a similar manner. The typical amount for particular dopant concentration of MnCl2 was added into Ni(OH)2 aqueous solution under continuous stirring. The final product was then centrifuged and washed several times by the ethanol and double distilled (DD) water. Then dried at 120 °C for 12 h and again calcined at 500 °C for 1 h to obtain the light green colored Mn/NiO nanopowders (Wu, Munoz, and Montero 2010).
A greener tetraphenylporphyrin synthesis and metallation: an undergraduate teaching experiment
Published in Green Chemistry Letters and Reviews, 2023
Matthew A. Nitka, Katarina E. Zerbee, Julianne M. Dee, Matthew A. Cranswick, Edward P. Zovinka, John R. De Backere
Proper protective equipment (e.g. goggles, lab coat, nitrile gloves, etc.) should be worn at all times and work performed in a fume hood where possible. Ethyl acetate (EtOAc), ethanol (EtOH), methanol (MeOH), and propionic acid are highly flammable. Refluxing solvent and hotplates can cause burns. Metal salts are generally toxic and environmentally hazardous, and the cobalt and nickel acetate salts are suspected carcinogens. Propionic acid is corrosive and can cause severe skin and eye irritation or damage.