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RISS 인기검색어
- 검색키워드
- 저자 : Khraisheh Majeda (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Photocatalytic disinfection of Escherichia coli using TiO2 P25 and Cu-doped TiO2
Majeda Khraisheh,Mohammad A. Al-Ghouti,Lijun Wu,Ala’a H. Al-Muhtaseb 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Both sol gel and wet impregnation method are used to create undoped and Cu doped TiO2 in an effort toenhance the photocatalytic activity, evaluated via the photedegradation and inactivation of Escherichiacoli. The results showed that TiO2 doped with 10% CuCl2 prepared by wet-impregnation method resultedin a complete 100% E. coli inactivation within one hour (from 106 to 0 CFU/mL). The results also showedthat pH has a negligible effect on E. coli inactivation. The use of river water confirmed that photocatalyticdisinfection could be quenched by impurities in the water, such as dissolved organic matter.
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Majeda Khraisheh,김종규,Luiza Campos,Ala’a H. Al-Muhtaseb,Alaa Al-Hawari,Mohammad Al Ghouti,Gavin M. Walker 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Photocatlytic removal of three pharmaceutical and personal care products pollutants using novel TiO2–Coconut Shell Powder (TCNSP) composite was investigated. The photocatalytic degradation rate of PPCPsgenerally increased with increasing light intensity and dissolved oxygen concentration. The degradationrate decreased with increasing initial concentration of PPCPs. The PPCPs concentration decreasedsubstantially under irradiation of UVC when used in conjunction with the TCNSP composite. A number ofcomposite/radiation types and intensities were tested. The concentration rate decrease trend was as:UVC/TCNSP > UVA/TCNSP > UVC > UVA. Under the UVC/TCNP combination, 99% removal was achievedcompared to 30% for TiO2.
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Fabrication of g-C3N4 nanosheets on stainless steel mesh for effective separation of oil from water
Al-Kindi Nada Saeed,Marzouqi Faisal Al,Khraisheh Majeda,Kim Younghun,Selvaraj Rengaraj 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.11
Most industries depend mainly on oil and oil-based processes, which resulted in producing large volumes of oily wastewater. One of the most common methods used for the treatment of oily contaminated water is filtration by modified surfaces. In this research g-C3N4 nanostructured material was prepared via thermal condensation method. The samples were characterized by advanced techniques such as XRD, XPS, FTIR scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectrophotometry (EDX). The result showed that g-C3N4 were crystallized in tri-s-triazine phases and their mean crystalline sizes of these nanostructures were 12.17 nm. The high-magnification microscopy images show that the morphology of g-C3N4 was nanosheet. A stainless-steel mesh was modified and coated with the prepared g-C3N4 nanostructured materials to be used for the separation of oil and water mixture. Due to the hydro-phobic nature of the modified meshes, oil drops spread over the mesh surface and the water drops form spherical shapes. The most efficient coating among all the modified meshes was g-C3N4, which was functionalized using silane moiety. The separation efficiency of this coated mesh reached 74.87% and it resulted in fast separation. This mesh can separate different types of oil from the oil/water mixture, such as toluene, mineral oil, 2-ethyl-1-hexanol, and n-pentane with good efficiency. Separation was repeated up to 40 times using the same mesh, and the separation efficiency was measured each time.
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Flocculation and viscoelastic behavior of industrial papermaking suspensions
Mustafa S. Nasser,Mohammed J. Al-Marri,Abdelbaki Benamor,Sagheer A. Onaizi,Majeda Khraisheh,Mohammed A. Saad 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.2
The effects of the surface charge type and density C496, C492 and A130LMW polyacrylamides (PAMs) on the rheological behavior of real industrial papermaking suspensions were quantitatively related to the degree of flocculation for the same industrial papermaking suspensions. The floc sizes were larger but less dense when anionic PAM was used, and this due to the repulsive forces between the anionic PAM and colloidal particles, leading to the development of open structure flocs of less density. On the other hand, rheological measurements showed that the papermaking suspension is thixotropic with a measurable yield stress. The results showed that the magnitude of the critical stress, τc, complex viscosity, η *, elastic modulus, G', and viscous modulus, G'', depend on the number of interactions between the PAM chains and particle surface and the strength of those interactions. Cationic PAM showed higher values of η *, G', G'' and τc compared to anionic PAM. This behavior is in good agreement with Bingham yield stress, τB, adsorption and effective floc density results. Similar to oscillatory measurements, creep measurements also showed that the deformation was much lower for the cationic PAM based suspensions than for the anionic PAM based suspensions. Furthermore, the results revealed that increasing the cationic PAM surface charge decreases the floc size but increases the adsorption rate, elasticity and effective floc density proposing differences in the floc structures, which are not revealed clearly in the Bingham yield stress measurements.
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