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RISS 인기검색어
- 검색키워드
- 저자 : Muhammad Naveed Afridi (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Afridi, Muhammad Naveed,Lee, Won-Hee,Kim, Jong-Oh Elsevier 2019 Environmental research Vol.171 No.-
<P><B>Abstract</B></P> <P>Phosphorus is a necessary nutrient for the growth and survival of living beings. Nevertheless, an oversupply of phosphorus in wastewater results in eutrophication. Therefore, its removal from wastewater is important. However, coexisting components, such as anions, heavy metals, and organic matter, might inhibit the phosphate-adsorption mechanism by competing for the active surface sites of the adsorbent. In this study, iron oxide nanoflakes (INFs) were fabricated on iron foil via anodization. The rate of phosphate adsorption from wastewater onto INFs in the presence of three different coexisting components—anions, heavy metals, and organic matter—was evaluated. The morphology of the INFs was analyzed by X-ray diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy. The phosphate adsorption equilibrium time using INFs was found to be 1 h. The Elovich model (R<SUP>2</SUP> > 0.99) and the Langmuir model (R<SUP>2</SUP> >0.95) respectively provided the best description of the adsorption kinetics and isotherm, suggesting the chemisorption nature of adsorption. The estimated adsorption capacity of the INFs was 21.5 mg-P g<SUP>–1</SUP>. The effect of anions (chloride, sulfate, nitrate, and carbonate) and heavy metals (Cd, As, Cr, and Pb) was studied at three different molar ratios (0.5:1, 1:1, and 1.5:1). The effect of different types of organic matter, such as citric acid, humic acid, and oxalic acid at concentrations of 100 and 200 mg L<SUP>–1</SUP>, was also examined. In five regeneration cycles, the total amount of phosphate adsorbed and desorbed, and the recovery percentage were 6.51 mg-P g<SUP>–1</SUP>, 5.16 mg-P g<SUP>–1</SUP>, and 79.24%, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Iron oxide nanoflakes were synthesized via an electrochemical anodization. </LI> <LI> Effect of time, phosphate concentration, and coexisting components were tested. </LI> <LI> Phosphate uptake process was followed by the Elovich model. </LI> <LI> The maximum phosphate adsorption capacity of INF was 21.5 mg-P g<SUP>–1</SUP>. </LI> <LI> Effect of coexisting organic matter is higher followed by heavy metals and anions. </LI> </UL> </P>
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Application of synthesized bovine serum albumin-magnetic iron oxide for phosphate recovery
Muhammad Naveed Afridi,Wonhee Lee,Jong-Oh Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.86 No.-
Phosphorous is an essential nutrient that is widely used as a fertilizer in agriculture. However, itsincreased discharge from agricultural runoff contributes to eutrophication, necessitating its removalfrom wastewater. Adsorption is one of several treatment processes for this purpose. In this study, bovineserum albumin-magnetic iron oxide (BSA-MIO) was successfully synthesized using the co-precipitationmethod. Its morphology was characterized byfield emission scanning electron microscopy, energydispersive X-ray spectroscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy. Differentparameters that affect adsorption, such as initial phosphate concentration, reaction time, adsorbentdosage, pH, coexisting anions, and temperature, were investigated. The results showed that phosphateadsorption increased with reaction time and temperature while it decreased with an increase in solutionpH. The phosphate adsorption equilibrium time using BSA-MIO was 1 h. The estimated maximumadsorption capacity of BSA-MIO was 20.7 mg P g 1. Moreover, the pseudo-second-order model(R2 > 0.99) and Langmuir model (R2 > 0.99) elucidated the better description of the adsorption kineticsand isotherm, respectively, thereby suggesting the chemisorption nature of adsorption. The coexistinganions (NO3, Cl , SO42 , and CO32 ) showed no significant effect on phosphate adsorption. Moreover,the adsorbed phosphate was successfully desorbed using different concentrations and combinations ofNaOH and NaCl. © 2020 The Korean
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Ullah, Muhammad Zia,Khan, Ashraf Ullah,Afridi, Ruqayya,Rasheed, Hina,Khalid, Sidra,Naveed, Muhammad,Ali, Hussain,Kim, Yeong Shik,Khan, Salman Elsevier 2018 INTERNATIONAL IMMUNOPHARMACOLOGY Vol.61 No.-
<P><B>Abstract</B></P> <P>In the current study, the puerarin was investigated for both acute Carrageenan and chronic CFA-induced inflammatory pain models. The Puerarin treatment significantly attenuated (P < 0.001) the mechanical hyperalgesia and mechanical allodynia in both Carrageenan and CFA-induced hyperalgesia. The Puerarin treatment also remarkably reduced (<I>p</I> < 0.001) the thermal hyperalgesic responses in both acute Carrageenan as well as chronic CFA-induced models. Furthermore, the Puerarin administration was also associated with significant inhibition of (<I>p</I> < 0.001) paw edema in both Carrageenan and CFA-induced models. The inflammatory mediators such as IL-1β, IL-6, TNF-α and vascular endothelial growth factor (VEGF) are significantly enhanced during inflammatory conditions, however, the Puerarin administration significantly altered (P < 0.001) the mRNA expression levels of these mediators. Additionally, the Puerarin treatment also significantly enhanced (P < 0.001) the mRNA expressions levels of the anti-oxidant enzymes such as Nrf2, HO-1 and SOD2. The Puerarin treatment is associated with significant (P < 0.001) inhibition of the acetic acid-induced Evans blue vascular permeability. Moreover, the concentration of Puerarin in various tissues was analyzed using High-performance liquid chromatography (HPLC) and the results showed that the Puerarin was significantly distributed towards the peripheral tissues such as liver and kidney and less distributed towards the brain.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Puerarin possess strong antinociceptive properties in animal models. </LI> <LI> Puerarin inhibited various inflammatory cytokines (IL-1β, IL-6, TNF-α), and (VEGF). </LI> <LI> Vascular permeability was significant inhibited by puerarin. </LI> <LI> No apparent toxic effect of puerarin was observed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Fatima, Rida,Afridi, Muhammad Naveed,Kumar, Vanish,Lee, Jechan,Ali, Imran,Kim, Ki-Hyun,Kim, Jong-Oh Elsevier 2019 JOURNAL OF CLEANER PRODUCTION Vol.231 No.-
<P><B>Abstract</B></P> <P>Nitrophenols are used extensively in the chemical, pharmaceutical, and pesticide industries. Recently, water pollution caused by nitrophenols has gained worldwide attention. Significant efforts have been made over the past years to develop effective treatment options for the removal of nitrophenols in aqueous phase. Photocatalysis using titanium dioxide (TiO<SUB>2</SUB>) is regarded as one of the most effective options to degrade nitrophenols in contaminated water. This review deals with the performance of TiO<SUB>2</SUB> photocatalysis for the degradation of nitrophenols and related mechanisms. The performance of TiO<SUB>2</SUB> photocatalysts is assessed by comparing basic performance metrics such as quantum yields and reaction rates before and after modification (e.g., pristine vs. modified forms). Results suggest that TiO<SUB>2</SUB>-based photocatalysis is a promising treatment option for degrading nitrophenol.</P>
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