Blend compatibility of waste materials—Cellulose acetate (from sugarcane bagasse) with polystyrene (from plastic cups): Diffusion of water, FTIR, DSC, TGA, and SEM study

2007 ◽  
Vol 104 (2) ◽  
pp. 909-914 ◽  
Author(s):  
Carla da Silva Meireles ◽  
Guimes R. Filho ◽  
Rosana M. N. de Assunção ◽  
Mara Zeni ◽  
Kátia Mello
2010 ◽  
Vol 66 (3) ◽  
pp. 377-389 ◽  
Author(s):  
Moacir Fernandes Ferreira Júnior ◽  
Elaine Angélica Ribeiro Mundim ◽  
Guimes Rodrigues Filho ◽  
Carla da Silva Meireles ◽  
Daniel Alves Cerqueira ◽  
...  

2008 ◽  
Vol 48 (8) ◽  
pp. 1443-1448 ◽  
Author(s):  
Carla da Silva Meireles ◽  
Guimes Rodrigues Filho ◽  
Rosana Maria Nascimento de Assunção ◽  
Daniel Alves Cerqueira ◽  
Mara Zeni ◽  
...  

Author(s):  
Kamlesh Dashora ◽  
Shailendra Saraf ◽  
Swarnalata Saraf

Sustained released tablets of diclofenac sodium (DIC) and tizanidine hydrochloride (TIZ) were prepared by using different proportions of cellulose acetate (CA) as the retardant material. Nine formulations of tablets having different proportion of microparticles developed by varied proportions of polymer: drug ratio ‘’i.e.’’; 1:9 -1:3 for DIC and 1:1 – 3:1 for TIZ. Each tablet contained equivalent to 100 mg of DIC and 6mg of TIZ. The prepared microparticles were white, free flowing and spherical in shape (SEM study), with  the particle size varying from 78.8±1.94 to 103.33±1.28 µm and 175.92± 9.82 to 194.94±14.28µm for DIC  and TIZ, respectively.  The first order rate constant K1 of formulations were found to be in the range of  K1 = 0.117-0.272 and 0.083- 0.189 %hr-1for DIC and TIZ, respectively. The value of exponent coefficient (n) was found to be in the range of 0.6328-0.9412  and 0.8589-1.1954 for DIC and TIZ respectively indicates anomalous  to  non anomalous transport type of diffusions among different formulations


2015 ◽  
Vol 42 (7) ◽  
pp. 1066-1072 ◽  
Author(s):  
Guimes Rodrigues Filho ◽  
Flávia Almeida ◽  
Sabrina D. Ribeiro ◽  
Thiago F. Tormin ◽  
Rodrigo A. A. Muñoz ◽  
...  

2011 ◽  
Vol 33 (3) ◽  
pp. 566-571 ◽  
Author(s):  
Guimes Rodrigues Filho ◽  
Sabrina Dias Ribeiro ◽  
Carla da Silva Meireles ◽  
Leandro Gustavo da Silva ◽  
Reinaldo Ruggiero ◽  
...  

2015 ◽  
Vol 754-755 ◽  
pp. 369-372
Author(s):  
Muhamad Azani Yahya ◽  
Mohammed Alias Yusof ◽  
Norita Ridzuan ◽  
Mohamad Yusrin Yahya ◽  
Ahmad Azizi Ab Aziz

Discovering about sustainability, construction sector should be a part of participant in utilizing waste materials for the benefits of the industry. The idea of converting waste materials into some application can contribute to sustainability and greening the earth. Apart from that, research must be done to promote the waste material into economic and useful construction material. A concept of going green must be adopted rather than just thinking of the rapid construction as the whole project aim. This paper promotes sugarcane bagasse as an additive for construction material in 3 ways which are on concrete strength improver, a concrete retarder and composite brick. The sugarcane bagasse were blended and mixed with 30MPa concrete with certain ratio and tested for compressive, flexural, water absorption and penetration. From the tests, it shows that the sugarcane bagasse gives a positive impact to concrete. Therefore, the usage of sugarcane bagasse can be considered as a concept of utilizing waste material for sustainable approach.


2005 ◽  
Vol 96 (2) ◽  
pp. 516-522 ◽  
Author(s):  
Guimes Rodrigues Filho ◽  
Ricardo Chagas da Silva ◽  
Carla da Silva Meireles ◽  
Rosana Maria Nascimento de Assunção ◽  
Harumi Otaguro

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2501
Author(s):  
Ali Aldalbahi ◽  
Mehrez El-Naggar ◽  
Tawfik Khattab ◽  
Meram Abdelrahman ◽  
Mostafizur Rahaman ◽  
...  

Novel ecofriendly adsorbents, cellulose acetate/graphene oxide (CA-GO) nanocomposite, were prepared from sugarcane bagasse agro-waste for removing Ni2+ ions from wastewater. Graphene oxide (GO) was prepared by the oxidation of sugarcane bagasse using ferrocene under air atmosphere. Cellulose acetate (CA) was also prepared from sugarcane bagasse by extraction of cellulose through a successive treatments with sulfuric acid (10% v/v), sodium hydroxide (5% w/v), ethylenediaminetetraacetic acid, and hydrogen peroxide, and finally, followed by acetylation. CA-GO was prepared via mixing of GO and CA in the presence of calcium carbonate and different concentrations of GO, including 5, 10, 15, 20, 25, and 30 wt% relative to the weight of CA. The CA-GO nanocomposite showed porous microstructures with high surface area, which enhance their ability towars the adsorption of Ni2+ ions from wastewater. The morphological properties of the prepared adsorbents were explored by scanning electron microscope (SEM) and Fourier-transform infrared spectroscopy (FT-IR). The efficiency of the CA-GO towards the adsorption of Ni2+ ions from wastewater was explored against as time, temperature, and total content of Ni2+ ions. The adsorption measurements of Ni2+ ions were investigated within the concentration range of 10–40 mg/L, time range between 15 and 90 min, and temperature range between 25 °C and 55 °C. The results displayed a considerable improvement in the adsorption process of Ni2+ ions by CA-GO-2 with a removal efficiency of 96.77%. The isotherms were monitored to best fit the Langmuir model. Finally, the adsorption performance of the prepared CA-GO nanocomposite films demonstrated promising properties as green, sustainable and cheap adsorbents for water pollutants.


2017 ◽  
Vol 167 ◽  
pp. 280-289 ◽  
Author(s):  
R.G. Candido ◽  
G.G. Godoy ◽  
Adilson R. Gonçalves

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