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Journal of Ecosystem & Ecography | ISSN: 2157-7625 | Volume: 8
June 28-29, 2018 | Alexandria, Egypt
International Pre Conference Workshop on
Microbial Ecology & Eco Systems
Removal of Cr VI from water using green chemistry
Mohamed R Elsheref,
1
Abdelmonem M Ahmed,
2
Mona A Darwesh
and
3
Essam Elmelegy
1
Chemistry Department, Faculty of Science, Alexandria University, Egypt
2
Chemical Engineering Department, Faculty of Engineering, Tanta University, Egypt
3
Damanhur Central Labs, Ministry of Health, Damanhour, Egypt
R
emoval of water pollutants is one of the most global environmental challenges of the 21
st
century due to discharges of
toxic substances from anthropogenic activities. This investigation aimed at testing the kinetic and isothermal parameters
of Chromium (Cr VI) adsorption by apricot stone powder as natural adsorbent. The adsorption capacities measured as the
amount of metals adsorbed per unit mass of adsorbent and the percentage of adsorption was calculated. Using of 0.5 gm
sample size of Apricot stone powder has significant removed almost 90% of Cr VI with an initial concentration of 100 ppm
within 120 min. A significant increase in the removal of Cr VI with increase in the apricot stone sample size and increase in
media temperature. A remarkable efficiency for apricot stone powder was in the range of metal concentration of 50 to 300
ppm, and 120 min was the optimum contact time for effective adsorption. The optimum time for highest percentage removal
of Cr VI was determined by kinetics to be around 30 min, and optimum pH was 1.5. it is obvious that 1.0 gm dose is the most
efficient adsorbent dose, and the ideal temperature is 25-30
0
C.The pseudo second order kinetic model was more suitable for
describing the adsorption system and the Freundlich isotherm generates a satisfactory fit to the experimental data as indicated
by correlation coefficients and average percentage error than Langmuir isotherm. The thermodynamic parameters ∆G
o
,∆ H
o
and ∆S
o
were also studied and found that the sorption was feasible, spontaneous and endothermic in nature. The positive value
of entropy change suggested the increased randomness.
Keywords:
Pollution, Apricot stone, Adsorption, Heavy metals, Aqueous solution, pH
Biography
Mohamed R Elsheref is a biomedical and pharmaceutical representative, He worked as a Research Assistant in the Chemistry Department, Faculty of Science,
Damanhur University, Albuhera, Egypt, 2010. He is a member of Life Makers Developmental Organization, (Education is Power Project), 2013- Present. He
earned his Master in Physical Chemistry, Alexandria University in 2017, Biochemistry Diploma, 2014, Zagazig Univesity, Damanhur University, Albuhera, Egypt.
He is Member of Life Makers developmental organization, (Education is Power Project) June 2013- Present. Participate in campaigns to attract and inspire
new volunteers, and in campaigns to open literacy classes at Alexandria suburbs and underprivileged villages. He is a member of Benna group for publication,
2015-Present, and volunteering in Benna project of translating useful websites to the Arab world.
Mohamed
_elsheref@alexu.edu.egMohamed R Elsheref et al., J Ecosys Ecograph 2018, Volume: 8
DOI: 10.4172/2157-7625-C2-035