eng
Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
2636-3305
2020-06-01
31
Issue 1-A
1
9
10.21608/absb.2020.111459
111459
Original Article
PREPARATION AND ELECTROCHEMICAL BEHAVIOR OF THE ACTIVATED CARBON FROM POMEGRANATE PEELS AS ENERGY-STORAGE MATERIALS
Mona Morad
monyam19@yahoo.com
1
Sayed Attia
sayed2ya@yahoo.com
2
Saad Mohamed
sgmmohamed@gmail.com
3
M. Moharam
4
R. AbouShahba
5
M. Rashad
6
Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Egypt.
Chemical Engineering Department, Tabbin Institute for Metallurgical Studies, (TIMS), Helwan, Cairo, Egypt.
Chemical Engineering Department, Tabbin Institute for Metallurgical Studies, (TIMS), Helwan, Cairo, Egypt.
Central Metallurgical Research& Development Institute (CMRDI), Helwan, Cairo, Egypt.
Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Egypt.
Central Metallurgical Research& Development Institute (CMRDI), Helwan, Cairo, Egypt.
This study investigates the electrochemical evaluation of the activated carbon (AC) prepared from pomegranate peels which were collected, dried, carbonized and finally activated with KOH at different temperatures. The characterization of the as-prepared AC revealed an amorphous type of carbon and densely layer-stacking sheets with an interconnected micro porous network with a remarkable 3128.86m2g-1 surface area. The as-synthesized AC displayed a remarkable capacitance of 126 F g-1 at 0.5 A g-1with a storage retention of 137 % after 2000 cycles at a current density of 2 A g-1. Meanwhile, the realistic symmetrical simulation has been installed, it shows an energy density of 4.58 W h kg-1 at a power density of 244 W kg-1 with a storage retention of 66 % of the initial capacity at a current density of 2 A g-1 after 2000 cycles. Overall, these results demonstrate that for supercapacitors evaluation, the AC electrode can be considered a successful electrode material.
https://absb.journals.ekb.eg/article_111459_0a87a2480b36880640d0c2ac08dbc0a5.pdf
Activated carbon
pomegranate peels
Supercapacitors
Symmetric device
energy storage
eng
Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
2636-3305
2020-06-01
31
Issue 1-A
11
18
10.21608/absb.2020.111463
111463
Original Article
CORROSION INHIBITION OF CASEIN AS A NATURAL PROTEIN FOR 316L STAINLESS STEEL IN SIMULATED BODY FLUID
Aisha Hendy
aisha.hendy298@gmail.com
1
Jehan Elnady
j.elnady@gmail.com
2
Nazly Hassan
na_hassan12@yahoo.com
3
T. Tamer
4
Amal Ahmed
profdramalelroby@yahoo.com
5
Rabab Abou Shahba
mmbelsabbah@gmail.com
6
Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Nasr City, Cairo, Egypt
Electronic Materials Department, Advanced Technologies and New Materials Research, Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt
Composites and Nano Structured Materials Research Department, Advanced Technologies and New Materials Research, Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt.
Polymer Materials Research Department, Advanced Technologies and New Materials Research Institute, (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt.
Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Nasr City, Cairo, Egypt
Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Nasr City, Cairo, Egypt.
The importance of biomaterials is increased steadily with the augmentation of population and aging. In this research, casein, a protein present in milk, used to modify the 316L stainless steel (316L SS) alloy surface, used in medical application, against corrosion in the corrosive body fluid. Due to the presence of hetero-atoms in its moiety, casein has the ability to form a protective thin layer. Self-assembled monolayers (SAMs) technique is a common tool providing a well ordered thin film on the metallic surface. Casein was assumed to form SAMs on the 316L SS surface and the corrosion inhibition efficiency was examined electrochemically. The results proved the formation of SAMs and displayed that casein reduce the corrosion rate and serves as a mixed type inhibitor. The inhibition efficiency is increased by increasing the casein’s concentration and immersion time in the casein’s solution. A maximum inhibition efficiency obtained at 1000 ppm with immersion time equals 120 minutes. Further modification is undertaken to increase the inhibition efficiency.
https://absb.journals.ekb.eg/article_111463_a1fe4fb91b2b376385a9ea84c2aa0889.pdf
biomaterial
Corrosion inhibition
SAMs
natural protein
casein
316L stainless steel
SBF
eng
Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
2636-3305
2020-06-01
31
Issue 1-A
19
32
10.21608/absb.2020.111464
111464
Original Article
ION CHROMATOGRAPHIC DETERMINATION OF YTTRIUM AFTER SEPARATION FROM DYSPROSIUM SIMULTANEOUSLY WITH INDIVIDUAL QUANTIFICATION OF RARE EARTH ELEMENTS
Sherien Ahmed
boutey@yahoo.com
1
Nuclear Materials Authority, Cairo, Egypt
A particular ion chromatographic method for yttrium determination after separation from dysprosium simultaneously with individual quantification of rare earth elements has been modified. Selective separation of yttrium from dysprosium plus the other thirteen rare earth elements was achieved by gradient elution using oxalic / diglycolic acid eluent mixture on IonPac CS5A separating column. The separated ions were then detected using 4-(2-pyridylazo)resorcinol (PAR) at 530 nm. The optimized method was subsequently validated by the analysis of a reference sample from Abu Rusheid area followed by its application on two geological materials from Wadi Khuda-Wadi Shut area and Abu Tartour phosphate deposits. Relative standard deviation (RSD) calculated for the analyzed samples were expressed with very low values the matter which confirms the precision of the developed method. The present work allowed the individual determination of lanthanide elements including yttrium and six heavy metal ions in an absolute time of about 110 minutes.
https://absb.journals.ekb.eg/article_111464_40183ad1a4074f6819b064cb5de2b7fd.pdf
Ion chromatography
Yttrium
Rare earth elements
Heavy metals
Gradient Elution
eng
Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
2636-3305
2020-06-01
31
Issue 1-A
33
49
10.21608/absb.2020.111469
111469
Original Article
PREPARATION OF ACTIVATED CARBON FROM ION EXCHANGE RESIN WASTE AND ITS APPLICATION FOR MANGANESE REMOVAL FROM GROUNDWATER
A. Swelam
1
Yahia Gedamy
yahiagedamy2014@yahoo.com
2
Ahmed El.shahed
ahmedelshahed2018@gmail.com
3
Chemistry Department, Faculty of Science, Al-Azhar University, Cairo, Egypt.
Hydrogeochemistry Dept., Desert Research Center, El-Matareya, Cairo, Egypt.
Physical chemistry .faculty of science Al.azhar univercity Cairo.Egypt
The present study aims to synthesize an activated carbon adsorbent (S-AC, P-AC and OH-AC) from polystyrene divinyl benzene waste under different carbonization temperature (450oC and 900 oC and activation conditions (H2SO4, H3PO4 or NaOH). It being characterized and applied as an adsorbent for manganese removal from groundwater. FTIR results indicate that the changes in the peak intensities clear that the binding process was occurring on the surface of the adsorbent. Different factors such as solution pH, adsorbent dosage, contact time, temperature and Mn(II) initial concentration were investigated. The results showed that manganese adsorption capacity decreases with the increase of the carbonization temperature (900oC) and of activating agent H2SO4 > H3PO4 >NaOH. Kinetically, it was shown that the activation temperature of 450oC is the best temperature for activating the adsorbent carbons. The pseudo-first-order model is appropriate for predicting the adsorption process of Mn(II) onto the P-AC 450oC, P-AC 900oC and OH-AC 900oC, while the pseudo-second-order model is appropriate for predicting the adsorption process of Mn(II) onto the both S-AC 450oC, S-AC 900oC, OH-AC 450oCand OH-AC 900oC. Thermodynamic calculations affirmed that Mn(II) adsorption onto S-AC and P-AC was an endothermic process while onto OH-AC was exothermic process. Finally, the results suggested that the prepared S-AC has high adsorption capacities for Mn(II) compared with other adsorbents, such as P-AC and OH-AC. Therefore, S-AC 450oCcan be used in the groundwater treatment unit.
https://absb.journals.ekb.eg/article_111469_59fc7d4fa1daf0903aa43aa59aef466a.pdf
Activated carbon
Ion exchange resin
ground water
eng
Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
2636-3305
2020-06-01
31
Issue 1-A
51
58
10.21608/absb.2020.111474
111474
Original Article
PLASMA POWER IMPACT ON ELECTROCHEMICAL PERFORMANCE OF LOW CARBON STEEL COATED BY PLASMA THIN TEOS FILMS
Amr Gangan
amr_gangan@azhar.edu.eg
1
Mansour ElSabbagh
2
M. Bedair
3
M. El-Sabbah
4
Alaa Fahmy
alaa.fahmy@azhar.edu.eg
5
Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City 11884, Cairo, Egypt.
Physics Department and Plasma Center, Faculty of Science, Al Azhar University, 11884 Cairo, Egypt.
Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City 11884, Cairo, Egypt.
Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City 11884, Cairo, Egypt.
Chemistry Department, Faculty of Science, Al Azhar University
Electrochemical properties of thin silicon oxy carbide films were investigated as anticorrosive coatings. The film was deposited on low carbon steel substrate by radio frequency capacitive coupled plasma technique using tetraethyl ortho silicate (TEOS) as a precursor and Ar was used as a carrier gas in dependence on the applied power. The chemical composition and morphological of the deposited films were examined by energy-dispersive X-ray spectroscopy (EDX) coupled with scanning electron microscopy (SEM). The SEM results confirm a pinhole-free layer of oxy carbide was formed on the steel surface after plasma treatment. The corrosion resistance of the coatings was analyzed by potentiodynamic polarization and electrochemical spectroscopy (EIS) in 3.5% NaCl solution at room temperature. The electrochemical results show remarkable corrosion resistance enhancement after plasma treatments. The corrosion current (icorr) is significantly reduced from 12 µA/cm2 for the blank sample to 1 and 0.3 µA/cm2 for treated samples at 50, and 100 W, respectively. A marked increase of the protective properties was detected by 100 W sample with protective efficiency more than 98 % at room temperature.
https://absb.journals.ekb.eg/article_111474_fb7f98e1239d492bd79f917b422990d7.pdf
Corrosion Resistance
mild steel
Plasma treatments
Tetraethyl ortho silicate
Thin film
eng
Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
2636-3305
2020-06-01
31
Issue 1-A
59
68
10.21608/absb.2020.111477
111477
Original Article
REMOVAL OF SOME ADVANCED DYES FROM AQUEOUS SOLUTION USING MODIFIED KAOLINITE CLAY
Abeer Emam
1
Mohamed Abdel Khalek
2
Department of Chemistry, Faculty of Science, Al-Azhar University (Girls), Nasr City, Cairo, Egypt.
Central Metallurgical Research & Development Institute (CMRDI), Cairo, Egypt.
Kaolin mineral and its modified forms were used for dye removal from aqueous solutions. The affecting parameters such as pH, dye concentration and contact time on the removal performance were investigated. Three different dyes (acid Green 25, Basic Blue 3 and Disperse Orange 13) were studied. The removal has a higher rate at initial period of contact time. The equilibrium is achieved at 120 min. The adsorption is occurring through transport of dye molecules from solution to solid surface. Then, they diffused into the pores. The order of adsorption was: Basic blue 3 > Acid Green 25 > Disperse Orange 13. The adsorption process follows the pseudo-second-order kinetics. The rate controlling step is not depending on the intra-particle diffusion. A Freundlich isotherm model could describe the adsorption. The calculated (RL) factor confirmed the variability of the adsorption process.
https://absb.journals.ekb.eg/article_111477_7a3cf5492eafb62f9fbcfc63582e8838.pdf
kaolin
Treatment
Adsorption
dyes
Kinetics