Scientific Program

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Scientific Program Day 1

Day 13 :

  • Polymer Chemistry

Session Introduction

Badr M. Thamer

King Saud University, Saudi Arabia

Title: Alkali-activated electrospun carbon nanofibers as an efficient bifunctional adsorbent for cationic and anionic dyes
Biography:

Badr Thamer earned a bachelor's degree in chemistry from Sana’a University and a master's degree in polymers science from King Saud University. He is a PhD. Student in King Saud University. He has published more than 9 papers in reputed journals and has been serving as researcher at King Saud University.

Abstract:

Activated electrospun carbon nanofibers (A-ECNFs) with micro/mesoporous structures and high surface areas (1615 m2/g) were prepared from polyacrylonitrile (PAN) by electrospinning technique followed by carbonization and alkali activation. The adsorption of Congo red (CR) and methylene blue (MB) dyes by A-ECNFs from aqueous solutions was investigated and compared with those of pristine ECNFs. The textural characteristics and morphology of the prepared pristine and activated ECNFs were characterized using various techniques. The adsorption performance was found to be associated to the surface area, porosity, and surface charges of the prepared adsorbents; the nature and molecular size of the dyes; and the pH and temperature of the solution. Six nonlinear isotherm models were applied to analyze the adsorption equilibrium data, and the results showed that the adsorption behavior could be appropriately described using the Redlich–Peterson isotherm model. The kinetic results for the adsorption of CR and MB onto A-ECNFs were fitted reasonably well to the Elovich model, and were fitted by a pseudo-second order (PSO) model onto the pristine ECNFs. According to the thermodynamic results, the adsorption of CR and MB onto the A-ECNFs was endothermic and spontaneous. In addition, the reusability of the A-ECNFs was evaluated over five adsorption-desorption cycles. 

Annamária Tóth

University of Sopron, Hungary

Title: Copper sulfate and potassium humate modified, antimicrobial food packaging material for extending fruit shelf–life
Biography:

Ms. Annamária Tóth, 26, is a PhD student at the Jozsef Cziraki Doctoral School of Wood Sciences and Technologies at the University of Sopron. Her research projects encompass natural materials, polysaccharide films, antimicrobial materials and active packaging.

Abstract:

Preventing food waste and food-borne illnesses is an important task today, in which the development of active, shelf life-enhancing packaging plays a major role (Dashipour et al., 2014; Sahraee et al., 2017).
In our research cellulose fiber based paper was prepared by the addition of potassium humate and copper sulfate. The aim of the research was to produce paper with a higher copper content that could extend the shelf life of fruits and vegetables, thus reducing the amount of food that becomes waste, and increasing food safety. An important task of our research was to investigate and identify the bonds between copper, humate and cellulose fibers in the paper and to determine these properties by surface composition (EDX), morphology (SEM), and Fourier-transform infrared spectroscopy (FT-IR). In our research, it was determined how the copper-binding capacity of humate-containing cellulosic fiber-based paper changes as a function of the humate content. The antibacterial and antifungal properties of the paper were also investigated.
During the research, paper with a higher copper content was successfully produced. The humate-containing paper had a 79-217 percent increase in copper compared to the copper sulfate but humate-free paper. Based on the results of SEM, EDS and FT-IR, it can be stated that a bond was formed between the humate and the copper particles. The paper containing humate and copper has been demonstrated to have antibacterial and antifungal properties both in vivo and in vitro.
 
This article was made in frame of the „EFOP-3.6.1-16-2016-00018 – Improving the role of research+development+innovation in the higher education through institutional developments assisting intelligent specialization in Sopron and Szombathely".
 

Yolanda Gonzalez-Garcia

Universidad de Guadalajara, MEXICO

Title: Valorization of waste bagasse from the Tequila industry via fermentation to produce polyhydroxybutyrate
Biography:

Yolanda González-García holds a PhD degree in Biotechnological processes and has her expertise in Industrial microbiology with special focus in bacterial biopolymers such as polyhydroxyalkanoates, exopolymeric substances, and bacterial cellulose. In 2007 she received the Ernst Mach grant from the Austrian Agency for International Mobility and Cooperation in Education and Research, for research exchange at the Graz University of Technology. She is titular researcher at the University of Guadalajara (Mexico) specifically at the Department of Wood, Cellulose and Paper, where studies the feasibility of using industrial wastes and by-product streams for the biotechnological production of value added-products.

Abstract:

Polyhydroxyalkanoates (PHAs) are fully biodegradable biopolyesters produced from renewable sources by many bacterial species under nutritional stress conditions, and they have similar properties to those of some petrochemical polymers such as polypropylene. Polyhydroxybutyrate (PHB) is the main PHAs representative, its production from low-cost substrates is of great interest since the culture medium cost (mainly the carbon source) has an important influence on the PHB final price. On the other hand, the Tequila industry in Mexico generates large amounts of a waste known as agave bagasse (346,700.00 tons in 2018) which represents an environmental problem. In the present research the use agave bagasse hydrolysate to produce PHB by the bacteria Burkholderia sacchari was evaluated, and the obtained polymer was characterized. The acid hydrolysis of bagasse yielded 20.6 g/L of reducing sugars, with xylose as the main monosaccharide, followed by glucose (7:3 ratio). Growth inhibitors, such as phenolic compounds, were eliminated from the hydrolysate by different methods (physical or enzymatic) and then, it was used as culture medium for the production of PHB obtaining a yield of 6.44 g/L of biomass accumulating 44% of the polymer. The PHB structure was confirmed by NMR, and presented a molecular mass of 557 kDa, while its Tm and crystallinity were 173.6 °C and 61%, respectively. It was concluded that agave bagasse could be valorized as carbon source for producing PHB.

BENSALAH JAOUAD

Ibn Tofail University, Kenitra Faculty of Sciences, Morocco

Title: Kinetic and thermodynamic study of the adsorption of cationic dyes (methylene blue, safranin) on artificial zeolites
Biography:

BENSALAH JAOUAD is currently working in Ibn Tofail University, Kenitra Faculty of Sciences, Morocco

Abstract:

The discharges from many industries (plastics, cosmetics, paper, and particularly textiles) are heavily loaded with dyes which have dangerous toxicological impacts on the environment.
           Methyl orange is an anionic azo dye widely used in laboratories and in the textile industry. Carcinogenic and mutagenic, it is a powerful water pollutant. And also Safranin is one of the most widely used synthetic azo cationic dyes. It comes as a reddish brown water soluble powder, which is mainly used as a food coloring in flavoring candies and cookies. Safranin is also used to dye tannin, cotton, bast fibers, wool, silk, leather and paper.
        The aim of this work is the liquid-solid extraction of cationic or anionic dyes from dilute aqueous solutions of 10 mg / l of the two dyes by a material based on the zeolite. The effect of several parameters on adsorption performance were studied (contact time, mass of the support, pH, etc.).
The results obtained are as follows:
• The adsorption equilibrium was obtained after 180 min of two cationic dyes (SF and BM) with a low mass of zeolite (0.1g) and at pH = 6.5.
• The adsorption capacity of the dye by the zeolite increases slightly with increasing temperature from 25 ° to 55 ° C.
• The evolution of the adsorption capacity over time at different concentrations of the dye ranging from 10 to 200 mg / l with a maximum absorption capacity of the dye by the zeolite at such that.
 Qmax (SF) =
 Qmax (BM) =
          The study of kinetic models confirm, on the one hand, that the adsorption of the two dyes (SF) and (BM) on the zeolite follows the pseudo-first order model, and on the other hand, that the Langmuir isotherm is the appropriate model to explain the adsorption process of safranin on zeolite.