کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
628255 1455486 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Carrier-mediated transport of Cr(III) across Lasalocid A-NPOE supported liquid membrane
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Carrier-mediated transport of Cr(III) across Lasalocid A-NPOE supported liquid membrane
چکیده انگلیسی

A weak amount of Cr(III), not exceeding 5%, was transported through a flat sheet supported liquid membrane (FSSLM) using Lasalocid A as carrier and nitric acid as stripping agent. This inefficient transport was mainly due to a driving force disappearance caused by a nitric acid leakage through the flat sheet membrane and then a feed pH decrease. Three experimental solutions have been proposed to overcome, at least partially, this hindrance. Firstly, Cr(III) was transported across a hollow-fiber supported liquid membrane (HFSLM) working as a column system, i.e., by recirculating the feed solution and the stripping solution separately and successively. A transport rate of 19% has been found when each solution was recirculated for 24 h. Secondly, tributyl phosphate (TBP) was used as modifier of the organic membrane solution to accelerate reaction kinetics to interfaces. The addition of TBP permits the transport of 17% of the initial Cr(III) amount in feed after 79 h of the transport process. Thirdly, the feed pH was kept constant by the addition of concentrated NaOH solution. This addition led to a complete Cr(III) transport and an initial flux of 4.1×10−7 mol.m−2.s−1 was obtained.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 204, Issues 1–3, 5 February 2007, Pages 234-240