تفاصيل الوثيقة نوع الوثيقة : مقال في مجلة دورية  عنوان الوثيقة : Isoelectric point and adsorption activity of porous g-C3N4 Isoelectric point and adsorption activity of porous g-C3N4   الموضوع : physics  لغة الوثيقة : الانجليزية  المستخلص : The isoelectric point (IEP) is an important physicochemical parameter of many compounds, such as oxides, hydroxides, and nitrides, and can contribute to estimation of the surface charges of compound particles at various pH conditions. In this work, three types of graphitic carbon nitrides (g-C3N4) were synthesized by directly heating melamine, thiourea, and urea. The prepared samples showed different microstructures and IEPs that influenced their adsorption activity. Differences in microstructure resulted from the various precursors used during synthesis. The IEPs of the obtained g-C3N4 were measured to be approximately 4-5, which is due to the equilibrium of chemical reactions between hydrogen ions, hydroxyl ions, and amine groups on the g-C3N4 surface. The IEP of g-C3N4 prepared from thiourea was lower than those of the corresponding samples prepared from melamine and urea. The adsorption activity of methylene blue on g-C3N4 prepared from urea and thiourea was excellent, which indicates that g-C3N4 is a promising adsorbent. This work provides a useful reference for choosing precursors with which to prepare g-C3N4 and combining g-C3N4 with other compounds in solution  ردمد : 0169-4332  اسم الدورية : APPLIED SURFACE SCIENCE  المجلد : 344  العدد : 1  سنة النشر : 1435 هـ 2015 م  نوع المقالة : مقالة علمية  تاريخ الاضافة على الموقع : Sunday, August 20, 2017  الباحثون اسم الباحث (عربي) اسم الباحث (انجليزي) نوع الباحث المرتبة العلمية البريد الالكتروني B.C Zhu Zhu, B.C باحث رئيسي دكتوراه   P Xia Xia, P باحث مشارك دكتوراه   W.K Ho Ho, W.K باحث مشارك دكتوراه   J.G Yu Yu, J.G باحث مشارك دكتوراه jiaguoyu@yahoo.com الملفات اسم الملف النوع الوصف  42696.pdf pdf   الرجوع إلى صفحة الأبحاث