scholarly journals Templated microwave synthesis of luminescent carbon nanofibers

RSC Advances ◽  
2018 ◽  
Vol 8 (23) ◽  
pp. 12907-12917 ◽  
Author(s):  
Clara Deeney ◽  
Suxiao Wang ◽  
Samir A. Belhout ◽  
Aoife Gowen ◽  
Brian J. Rodriguez ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Carbon Nanofibers ◽  
Microwave Synthesis ◽  
Environmentally Friendly ◽  
Microwave Pyrolysis

This work describes the preparation of luminescent carbon nanofibers by template-assisted microwave pyrolysis of environmentally friendly precursors in aqueous solution.

scholarly journals Microwave Synthesis, Characterization and Perspectives of Wood Pencil-Derived Carbon

2022 ◽  
Vol 12 (1) ◽  
pp. 410
Author(s):  
Nikolaos Chalmpes ◽  
Georgios Asimakopoulos ◽  
Maria Baikousi ◽  
Constantinos E. Salmas ◽  
Dimitrios Moschovas ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Surface Area ◽  
Microwave Synthesis ◽  
Chemical Activation ◽  
Added Value ◽  
Maximum Adsorption Capacity ◽  
Carbon Nanosheets ◽  
Process Stage ◽  
Domestic Microwave Oven ◽  
Original Length

More than 14 billion pencils are manufactured and used globally every year. On average, a pencil is discarded after 60% of its original length has been depleted. In the present work we propose a simple and affordable way of converting this non-neglectable amount of waste into added value carbon product. In particular, we demonstrate the microwave synthesis of carbon from the wood pencil with and without chemical activation. This could be a process stage before the final recycling of the expensive graphite core. In the latter case, irradiation of the wood pencil in a domestic microwave oven heats up the pencil’s graphite core, thus inducing carbonization of its wood casing. The carbonized product consists of amorphous carbon nanosheets having relatively low surface area. However, if the wood pencil is soaked in 50% KOH aqueous solution prior to microwave irradiation, a significantly higher surface area of carbon is obtained, consisting of irregular-shaped porous particles. Consequently, the obtained carbon can easily decolorize a methylene blue aqueous solution, can be used to make pocket warmers or gunpowder, and lastly, serves as an excellent adsorbent towards Cr(VI) removal from water, showing a maximum adsorption capacity of 70–75 mg/g within 24 h at 23 °C, pH = 3.

Environmentally Friendly Inorganic Magnetic Sulfide Nanoparticles for Efficient Adsorption-Based Mercury Remediation from Aqueous Solution

2018 ◽  
Vol 3 (6) ◽  
pp. 1840-1851 ◽  
Author(s):  
Khushbu Patel ◽  
Nimisha Singh ◽  
Jyotsna M. Nayak ◽  
Babli Jha ◽  
Suban K. Sahoo ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Environmentally Friendly

Reusable carbon nanofibers for efficient removal of methylene blue from aqueous solution

2018 ◽  
Vol 136 ◽  
pp. 744-752 ◽  
Author(s):  
Abdul Sameeu Ibupoto ◽  
Umair Ahmed Qureshi ◽  
Farooq Ahmed ◽  
Zeeshan Khatri ◽  
Muzamil Khatri ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Carbon Nanofibers ◽  
Efficient Removal

Removal of Organic Pollutants in Solution by Bamboo Charcoal

2013 ◽  
Vol 699 ◽  
pp. 554-556 ◽  
Author(s):  
Zi Lin Meng ◽  
Yi He Zhang ◽  
Qi An ◽  
Feng Zhu Lv ◽  
Qian Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Kinetic Model ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Organic Pollutants ◽  
Organic Contaminants ◽  
Low Cost ◽  
Environmentally Friendly ◽  
Bamboo Charcoal ◽  
Key Factors

Bamboo charcoal (BC) as an environmentally friendly and low-cost material receives widespread attention. Recently, much attention has been focused on the use of BC as adsorbent to treat wastewater. This paper provides an overview of the adsorption of organic contaminants in solution by using BC. The sorption behaviors of BC with various organic pollutants, and the kinetic model adopted to explain the adsorption rate of organic pollutants from aqueous solution were also reviewed. The adsorption capacity, the isotherm model, and several key factors such as modification, surface area, are discussed in this paper. Possible improvement of BC to treat organic contaminants in aqueous solution is also proposed.

Lead Sorption by Carbon Nanofibers Grown on Powdered Activated Carbon — Kinetics and Equilibrium

NANO ◽  
2015 ◽  
Vol 10 (02) ◽  
pp. 1550017 ◽  
Author(s):  
Abdullah Al Mamun ◽  
Yehya M. Ahmed ◽  
Ma'an Fahmi R. AlKhatib ◽  
Ahmad Tariq Jameel ◽  
Mohammed Abdul Hakeem Abdul Rahman AlSaadi
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Carbon Nanofibers ◽  
Research Work ◽  
Palm Kernel ◽  
Solid Substrate ◽  
Second Order ◽  
Powdered Activated Carbon ◽  
Palm Kernel Shell ◽  
Pseudo Second Order

Carbon nanofibers (CNFs) were synthesized by using a safe and less hazardous method, compared to using floating catalysts in chemical vapor deposition (CVD) process. This process used C 2 H 2 as carbon source and oil palm kernel shell-based powdered activated carbon (PAC) as cheap solid substrate. Use of nickel ( Ni 2+) impregnated PAC as fixed substrate for the synthesis of CNF is one of the novelties of the research work accomplished by the authors. The PAC–CNFs porous nanocomposite product was used for the sorption of lead ions ( Pb 2+) from synthetic aqueous solution. Kinetics of Pb 2+ adsorption and isotherms were investigated by varying initial concentration of lead and contact time. PAC–CNFs were found to remove Pb 2+ better at acidic pH of about 5.5. Langmuir and Freundlich isotherms were applied to the sorption equilibrium data to find the best fitted model. Langmuir isotherm model with R2 = 0.965 fitted the adsorption data better than the Freundlich isotherm. The kinetic processes of Pb 2+ adsorption on CNFs were investigated by applying different kinetic models, namely zero-order, pseudo-first-order and pseudo-second-order. The pseudo-second-order rate equation exhibited the best results with R2 = 0.999, qe = 74.79 (mg/g) and K2 = 0.029 (min ⋅ g/mg). The novel nanocomposite product seemed to have the potential to remove Pb 2+ ions from aqueous solution.

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