کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6306706 1618817 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Comparative electrochemical degradation of salicylic and aminosalicylic acids: Influence of functional groups on decay kinetics and mineralization
ترجمه فارسی عنوان
تداخل الکتروشیمیایی مقایسه ای از اسید سالیسیلیک و آمینوسالسیلیک: تأثیر گروه های کاربردی بر روی سینتیک و کانی سازی
کلمات کلیدی
4-آمینوسایلسیلیک اسید، اسید 5 آمینوسالیسیلیک، اکسیداسیون آنودیک، الکترو فنتون، فوتوالکترو-فنتون، اسید سالیسیلیک،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


- Salicylic, 4-aminosalicylic and 5-aminosalicylic acids treated in a BDD/air-diffusion cell.
- Faster pseudo-first-order decay for 4-aminosalicylic acid by AO-H2O2, EF and PEF.
- Quicker mineralization rate and current efficiency for salicylic acid in EF and PEF.
- More than 98% mineralization for all the drugs by the most powerful PEF treatment.
- Detection of oxalic acid as product of all the drugs and oxamic acid for both aminosalicylic acids.

Solutions of 100 mL with 1.20 mM of salicylic acid (SA), 4-aminosalicylic acid (4-ASA) or 5-aminosalicylic acid (5-ASA) have been comparatively degraded by anodic oxidation with electrogenerated H2O2 (AO-H2O2), electro-Fenton (EF) and photoelectro-Fenton (PEF). Trials were carried out with a stirred tank reactor with a BDD anode and an air-diffusion cathode for continuous H2O2 production. A marked influence of the functional groups of the drugs was observed in their decay kinetics, increasing in the order SA < 5-ASA < 4-ASA in AO-H2O2 and 5-ASA < SA < 4-ASA in EF and PEF, due to the different attack of OH generated at the BDD surface and in the bulk from Fenton's reaction, respectively. This effect was clearly observed when varying the current density between 16.7 and 100 mA cm−2. The relative mineralization power of the processes always followed the sequence: AO-H2O2 < EF < PEF. The three drugs underwent analogous mineralization abatement up to 88% by AO-H2O2 at 100 mA cm−2. The mineralization rate in EF and PEF grew in the order: 4-ASA < 5-ASA < SA. The most powerful process was PEF, attaining >98% mineralization for all the drugs at 100 mA cm−2. Oxalic and oxamic acids were detected as final short-linear aliphatic carboxylic acids by ion-exclusion HPLC, allowing the fast photolysis of their Fe(III) complexes by UVA light to justify the high power of PEF.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 154, July 2016, Pages 171-178
نویسندگان
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