کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
221561 464260 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Application of positively-charged ethylenediamine-functionalized graphene for the sorption of anionic organic contaminants from water
ترجمه فارسی عنوان
استفاده از بار مثبت گرافن عاملدار اتیلن برای جذب آلاینده های آلی آنیونی از آب
کلمات کلیدی
ED-G، اتیلن عاملدار گرافن؛ BET، برونر- امت- تلر؛ SSA، سطح ویژه؛ XPS، طیف سنجی فوتوالکترون اشعه ایکس؛ FWHM، پهنا در نصف مقدار بیشینه؛ IBU، ایبوپروفن؛ AT، آتنولول؛ CBZ، کاربامازپین؛ GO، اکسید گرافن؛ NOM، NAT
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Graphene oxide was functionalized with ethylenediamine molecules.
• Positive surface charge on functionalized graphene promoted organic anion sorption.
• Sorption extent is strongly influenced by solution pH.
• Electrostatic interactions likely govern sorption of charged molecules.

Graphene materials represent a new carbonaceous sorbent for the removal of organic micropollutants from water, and most applications of graphene utilize an oxidized, negatively-charged surface to improve dispersibility. However, classes of anionic micropollutants may undergo less sorption than cationic or neutral compounds on graphene oxide due to electrostatic repulsion forces. This work seeks to improve the sorptive capability of graphene for anionic micropollutants through amending surfaces with positive charges. Graphene oxide was functionalized with ethylenediamine (ED-G) through an acyl chlorination and amidation process that allows a net positive surface charge at pH < 8.1. ED-G held greater sorption capacity for anionic ibuprofen compared to cationic atenolol and neutral carbamazepine for nearly all water conditions within batch reactors. Ibuprofen sorption greatly increased, and atenolol sorption decreased, at more acidic solution pH. Competitive sorption experiments showed that ibuprofen is consistently preferred on ED-G over atenolol over a wide range of concentrations, and the presence of other anionic compounds can suppress the sorption of ibuprofen. These trends in sorption extent, sorbate charge, and sorbent charge indicate electrostatic interactions largely govern the binding of sorbate molecules. Consequently, a positively-charged graphene material could enhance the removal of anionic micropollutants within water treatment systems compared to graphene oxide.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Chemical Engineering - Volume 4, Issue 3, September 2016, Pages 2941–2951
نویسندگان
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