Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
2636-3305
31
Issue 1-A
2020
06
01
PREPARATION AND ELECTROCHEMICAL BEHAVIOR OF THE ACTIVATED CARBON FROM POMEGRANATE PEELS AS ENERGY-STORAGE MATERIALS
1
9
EN
Mona
M.
Morad
Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Egypt.
monyam19@yahoo.com
Sayed
Y.
Attia
Chemical Engineering Department, Tabbin Institute for Metallurgical Studies, (TIMS), Helwan, Cairo, Egypt.
sayed2ya@yahoo.com
Saad
G.
Mohamed
0000-0001-7465-4582
Chemical Engineering Department, Tabbin Institute for Metallurgical Studies, (TIMS), Helwan, Cairo, Egypt.
sgmmohamed@gmail.com
M.
M.
Moharam
Central Metallurgical Research& Development Institute (CMRDI), Helwan, Cairo, Egypt.
R.
M.
AbouShahba
Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Egypt.
M.
M.
Rashad
Central Metallurgical Research& Development Institute (CMRDI), Helwan, Cairo, Egypt.
10.21608/absb.2020.111459
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 3128.86m<sup>2</sup>g<sup>-1</sup> surface area. The as-synthesized AC displayed a remarkable capacitance of 126 F g<sup>-1</sup> at 0.5 A g<sup>-1</sup>with a storage retention of 137 % after 2000 cycles at a current density of 2 A g<sup>-1</sup>. Meanwhile, the realistic symmetrical simulation has been installed, it shows an energy density of 4.58 W h kg<sup>-1</sup> at a power density of 244 W kg<sup>-1</sup> with a storage retention of 66 % of the initial capacity at a current density of 2 A g<sup>-1</sup> after 2000 cycles. Overall, these results demonstrate that for supercapacitors evaluation, the AC electrode can be considered a successful electrode material.
Activated carbon,pomegranate peels,Supercapacitors,Symmetric device,energy storage
https://absb.journals.ekb.eg/article_111459.html
https://absb.journals.ekb.eg/article_111459_0a87a2480b36880640d0c2ac08dbc0a5.pdf
Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
2636-3305
31
Issue 1-A
2020
06
01
CORROSION INHIBITION OF CASEIN AS A NATURAL PROTEIN FOR 316L STAINLESS STEEL IN SIMULATED BODY FLUID
11
18
EN
Aisha
Hendy
Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Nasr City, Cairo, Egypt
aisha.hendy298@gmail.com
Jehan
Mohamed
Elnady
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
j.elnady@gmail.com
Nazly
Hassan
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.
na_hassan12@yahoo.com
T.
M.
Tamer
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.
Amal
S.
Ahmed
Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Nasr City, Cairo, Egypt
profdramalelroby@yahoo.com
Rabab
M.
Abou Shahba
Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Nasr City, Cairo, Egypt.
mmbelsabbah@gmail.com
10.21608/absb.2020.111463
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<sup>’</sup>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.
biomaterial,Corrosion inhibition,SAMs,natural protein,casein,316L stainless steel,SBF
https://absb.journals.ekb.eg/article_111463.html
https://absb.journals.ekb.eg/article_111463_a1fe4fb91b2b376385a9ea84c2aa0889.pdf
Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
2636-3305
31
Issue 1-A
2020
06
01
ION CHROMATOGRAPHIC DETERMINATION OF YTTRIUM AFTER SEPARATION FROM DYSPROSIUM SIMULTANEOUSLY WITH INDIVIDUAL QUANTIFICATION OF RARE EARTH ELEMENTS
19
32
EN
Sherien
H.
Ahmed
0000-0003-3983-4064
Nuclear Materials Authority, Cairo, Egypt
boutey@yahoo.com
10.21608/absb.2020.111464
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.
Ion chromatography,Yttrium,Rare earth elements,Heavy metals,Gradient Elution
https://absb.journals.ekb.eg/article_111464.html
https://absb.journals.ekb.eg/article_111464_40183ad1a4074f6819b064cb5de2b7fd.pdf
Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
2636-3305
31
Issue 1-A
2020
06
01
PREPARATION OF ACTIVATED CARBON FROM ION EXCHANGE RESIN WASTE AND ITS APPLICATION FOR MANGANESE REMOVAL FROM GROUNDWATER
33
49
EN
A.
A.
Swelam
Chemistry Department, Faculty of Science, Al-Azhar University, Cairo, Egypt.
Yahia
R.
Gedamy
Hydrogeochemistry Dept., Desert Research Center, El-Matareya, Cairo, Egypt.
yahiagedamy2014@yahoo.com
Ahmed
A.
El.shahed
Physical chemistry .faculty of science Al.azhar univercity Cairo.Egypt
ahmedelshahed2018@gmail.com
10.21608/absb.2020.111469
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 (450<sup>o</sup>C and 900 <sup>o</sup>C and activation conditions (H<sub>2</sub>SO4, H<sub>3</sub>PO<sub>4</sub> 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 (900<sup>o</sup>C) and of activating agent H<sub>2</sub>SO4 > H<sub>3</sub>PO4 >NaOH. Kinetically, it was shown that the activation temperature of 450<sup>o</sup>C 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 450<sup>o</sup>C, P-AC 900<sup>o</sup>C and OH-AC 900<sup>o</sup>C, while the pseudo-second-order model is appropriate for predicting the adsorption process of Mn(II) onto the both S-AC 450<sup>o</sup>C, S-AC 900<sup>o</sup>C, OH-AC 450<sup>o</sup>Cand OH-AC 900<sup>o</sup>C. 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 450<sup>o</sup>Ccan be used in the groundwater treatment unit.
Activated carbon,Ion exchange resin,ground water
https://absb.journals.ekb.eg/article_111469.html
https://absb.journals.ekb.eg/article_111469_59fc7d4fa1daf0903aa43aa59aef466a.pdf
Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
2636-3305
31
Issue 1-A
2020
06
01
PLASMA POWER IMPACT ON ELECTROCHEMICAL PERFORMANCE OF LOW CARBON STEEL COATED BY PLASMA THIN TEOS FILMS
51
58
EN
Amr
Gangan
Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City 11884, Cairo, Egypt.
amr_gangan@azhar.edu.eg
Mansour
ElSabbagh
Physics Department and Plasma Center, Faculty of Science, Al Azhar University, 11884 Cairo, Egypt.
M.
Bedair
Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City 11884, Cairo, Egypt.
M.
B.
El-Sabbah
Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City 11884, Cairo, Egypt.
Alaa
Fahmy
0000-0002-9060-0135
Chemistry Department, Faculty of Science, Al Azhar University
alaa.fahmy@azhar.edu.eg
10.21608/absb.2020.111474
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 (i<sub>corr</sub>) is significantly reduced from 12 µA/cm<sup>2 </sup>for the blank sample to 1 and 0.3 µA/cm<sup>2</sup> 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.
Corrosion Resistance,mild steel,Plasma treatments,Tetraethyl ortho silicate,Thin film
https://absb.journals.ekb.eg/article_111474.html
https://absb.journals.ekb.eg/article_111474_fb7f98e1239d492bd79f917b422990d7.pdf
Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
2636-3305
31
Issue 1-A
2020
06
01
REMOVAL OF SOME ADVANCED DYES FROM AQUEOUS SOLUTION USING MODIFIED KAOLINITE CLAY
59
68
EN
Abeer
A.
Emam
Department of Chemistry, Faculty of Science, Al-Azhar University (Girls), Nasr City, Cairo, Egypt.
Mohamed
A.
Abdel Khalek
Central Metallurgical Research & Development Institute (CMRDI), Cairo, Egypt.
10.21608/absb.2020.111477
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 (<em>R</em><sub>L</sub>) factor confirmed the variability of the adsorption process.
kaolin,Treatment,Adsorption,dyes,Kinetics
https://absb.journals.ekb.eg/article_111477.html
https://absb.journals.ekb.eg/article_111477_7a3cf5492eafb62f9fbcfc63582e8838.pdf