Hanan Ibrahim - Academia.edu (original) (raw)

Papers by Hanan Ibrahim

The objective of this study is to investigate and assess the use of in situ deposit nanosilver (n... more The objective of this study is to investigate and assess the use of in situ deposit nanosilver (nAg2O) or nanocopper oxides (nCuO)
into nonwoven polyester fabric (NWPF) as a safe and effective antibacterial filter of pollution from domestic wastewater. The
bactericidal effect of both nAg2O and nCuO was examined against Gram-negative bacteria (Escherichia coli, Salmonella typhi) and
Gram-positive bacteria (Enterococcus faecalis, Staphylococcus aureus) using agar diffusion disk method. In addition, the capability
of nAg2O and nCuO as disinfectants for secondary treated domestic wastewater was investigated as a case study. Transmission
electron microscope (TEM) confirmed the formation of nAg2O and nCuO particles with average particle sizes of 15 and 41 nm,
respectively. Disk diffusion results showed that nAg2O had a higher bactericidal effect than nCuO. Moreover, the disinfection of
secondary treated wastewater using 1.27mg/cm3 of nAg2O in the nonwoven fabric was capable of hindering 99.6% and 91.7% of
total and fecal coliforms within 10 minutes with a residual value of 18 and 15 MPN-index/100 mL, respectively. The residual total
and fecal coliform concentrations were far less than that stated in the national and international limits for wastewater reuse in
agriculture purpose.

In this study, the efficiency of metals immobilization in sludge using pozzolanic materials fly a... more In this study, the efficiency of metals immobilization in sludge using pozzolanic materials fly
ash and cement clinker dust (CCD) was investigated. Also, estimation of the optimum binder
to waste ratio was determined. Different leaching tests such as the standard European (EN)
12457-2 leaching tests; the toxicity characteristic leaching procedure; and the multiple extraction
procedure test were used to evaluate the efficiency of metals stabilization in sludge
matrix, and they showed that the availability of metals leaching (Cd, Cu, Cr, Pb, Ni, Zn)
from the stabilized sludge were lower than the permissible limit set by National and International
regulations for hazardous waste management. Examination of the solidified sample for
its compressive strength after curing for 28 days yielded a value of 1.55 and 4.57MPa for fly
ash, and CCD which indicates that the treated sludge was well solidified and safe to be used
in a wide variety of applications, for instance as a raw material for pavement blocks.

Scientific research and their educational activities commonly produce a wide variety of hazardous... more Scientific research and their educational activities commonly produce a wide
variety of hazardous wastes in relatively small volumes including new materials of unknown
toxicity and hazards. These could represent a significant risk to human health and the
environment unless it is identified, contained and disposed off in accordance with applicable
laws, regulations and best management practices. Therefore, the aim of this work is to provide
information, requirement, guidelines, and procedures for handling and disposal of hazardous
laboratory chemicals and biological wastes generated from different laboratories at the National
Research Center (NRC) of Egypt. This improved environmental performance by assisting in the
development and implementation of environmental management program that meets national
environmental requirements and minimizing pollution as well. The implementation of the
proposed management system was already started since 2006 and still ongoing according to the
guideline for management of hazardous waste.

In this study, zeolite was prepared from cheap local Egyptian clay (kaolin) and characterized by ... more In this study, zeolite was prepared from cheap local Egyptian clay (kaolin) and
characterized by X-ray diffraction, X-ray fluorescence spectroscopy, SEM. The
prepared zeolite was used as a binder for immobilization of the metals Cd2þ,
Cu2þ, Ni2þ, Pb2þ, and Zn2þ in contaminated sewage sludge. Different leaching
tests were conducted to determine the efficiency of the prepared zeolite for metal
stabilization. The leaching of the metals from stabilized sludge decreased as the
zeolite amount increased. It was found that 10% of zeolite is sufficient for the
stabilization of all metal ions under investigation. It was suggested that the metal
uptake mechanism by zeolite was by an ion-exchange mechanism. Examination of
the solidified sample for its compressive strength after curing for 28 days yielded a
value of 0.83 MPa, which indicates that the treated sludge was well solidified and
safe to be used in a wide variety of applications, for instance as a raw material for
pavement blocks.

Nano-material of calcium hydroxyapatite (n-CaHAp), with particle size ranged from 50-57 nm which ... more Nano-material of calcium hydroxyapatite (n-CaHAp), with particle size
ranged from 50-57 nm which prepared from phosphogypsum waste (PG),
was used for the removal of lead ions (Pb (II)) from aqueous solutions. It
was investigated in batch reactor under different experimental conditions.
The effects of process parameters such as pH, initial Pb ion concentration
and adsorbent dose were studied. Also, various kinetic modeling had been
studied where lead uptake was quantitatively evaluated using the
Langmuir, Freundlich and Dubinin–Kaganer–Radushkevich (DKR)
model. The Pb ions adsorption onto n-CaHAP could best fit Langmuir
isotherm model. The maximum adsorption capacity (qmax) for Pb ions was
769.23 mg/g onto n-CaHAp particles.

The process of retting flax produces a huge amount of wastewater which is characterized with bad ... more The process of retting flax produces a huge amount of wastewater which is characterized
with bad unpleasant smell and high concentration of organic materials. Treatment of such waste
had always been difficult because of the presence of refractory organic pollutants such as lignin.
In this study, treatment of retting wastewater was carried out using combined system of Fenton oxidation
process followed by adsorption on granular activated carbon (GAC). The effects of operating
condition on Fenton oxidation process such as hydrogen peroxide and iron concentration were
investigated. In addition, kinetic study of the adsorption process was elaborated. The obtained
results indicated that degradation of organic matters follows a pseudo-first order reaction with
regression coefficient of 0.98. The kinetic model suggested that the rate of reaction was highly
affected by the concentration of hydrogen peroxide. Moreover, the results indicated that the treatment
module was very efficient in removing the organic and inorganic pollutants. The average percentage
removal of chemical oxygen demand (COD), total suspended solid (TSS), oil, and grease
was 98.60%, 86.60%, and 94.22% with residual values of 44, 20, and 5 mg/L, respectively. The treated
effluent was complying with the National Regulatory Standards for wastewater discharge into
surface water or reuse in the retting process

tIn this study, cellulose acetate (CA) was modified by grafting with an equimolar binary mixture ... more tIn this study, cellulose acetate (CA) was modified by grafting with an equimolar binary mixture of acrylicacid (AA) and acrylamide (AAm) via radical polymerization technique using benzoyl peroxide as an initia-tor. Comparative studies between CA powder and modified CA [CA-g-(AA-co-AAm)] were investigated forPb(II) ions removal and recovery from wastewater. The main operating conditions such as pH, concentra-tion of Pb(II) ions and sorbent dose were also studied. Kinetic modeling has been studied and lead uptakecapacity was calculated using the Langmuir, Freundlich and Dubinin–Kaganer–Radushkevich (DKR) mod-els. The maximum sorption capacity (qemax) for Pb ions was only 9.4 mg/g for unmodified CA, while, it wasreached to 66.67 mg/g by using modified CA. Spectroscopic analysis (FTIR), SEM, EDX and XRD analysiswere investigated for CA and modified CA before and after recovery of lead ions from wastewater.