توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Application of nanofiltration membranes in the separation of Amoxicillin from pharmaceutical wastewater
اطلاعات انتشار: اولین کنفرانس بین المللی تصفیه فاضلاب و بازیافت آب، فناوری ها و یافته های نو، سال
تعداد صفحات: ۸
Separation of amoxicillin from pharmaceutical wastewater by nanofiltration membranes was studied. For this purpose a membrane system including a polyamide nanofiltration (NF) membrane was evaluated for the treatment of amoxicillin wastewater. The effect of the operating conditions such as flow rate, pressure and concentration of the feed on the efficiency of the membrane was evaluated. The permeation flux and rejection of amoxicillin were the criteria for this evaluation. The rejection of the amoxicillin by the selected NF membrane is adequate and in most cases exceeds 97% whereas COD reached a maximum of 40% rejection. Permeation flux was over 1.5 lit\min.m2. The rise in pressure enhanced the transport rate of the solvents. Permeate flux of membrane increased with increasing flow rates. Experimental data indicated that concentration polarization existed in this membrane separation process. The results are consistent with the NF mechanism of pressure–driven physical processes DQGVROXWLRQ±GLIIXVLRQFKemical processes. The stable separation performance for long–time operation showed that this kind of membrane has a good solvent resistance and could have a potential application in concentrating pharmaceutical extracts<\div>

۲Fabrication and Characterization of polyimide mixed matrix membranes containing functionalized MWCNTs by beta–cyclodextrin
نویسنده(ها): ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۸
In this paper, synthesized (raw) multi–walled carbon nanotubes (MWCNTs) were functionalized with beta–cyclodextrin (bC) using Chen’s soft cutting technique. Raw multi–walled carbon nanotubes (r–MWCNTs) and functionalized multi–walled carbon nanotubes (f–MWCNTs) were characterized by transmission electron microscope (TEM). Mixed matrix membranes (MMMs) were fabricated using the phase inversion method and were characterized by permeation tests using methane and carbon dioxide as test gases. The TEM results showed that beta–cyclodextrin; as a soft cutting or functionalization agent; can attach to the outer surface of the nanotubes and wrap them axially. Permeation tests showed that addition of 2 wt. % functionalized MWCNTs into the casting dope increases CO2\CH4 ideal selectivity from 24.13 to 38.88. In addition, the glass transition temperature of MMMs containing 2 wt. % f–MWCNTs was 320.58 o C while the glass transition temperature of the neat polyimide membrane was 312.12 oC. The increase in the glass transition temperature was attributed to the good dispersion of the functionalized MWCNTs inside the polymer matrix.<\div>
نمایش نتایج ۱ تا ۲ از میان ۲ نتیجه