Document Details Document Type : Article In Journal  Document Title : Isoelectric point and adsorption activity of porous g-C3N4 Isoelectric point and adsorption activity of porous g-C3N4   Subject : physics  Document Language : English  Abstract : 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  ISSN : 0169-4332  Journal Name : APPLIED SURFACE SCIENCE  Volume : 344  Issue Number : 1  Publishing Year : 1435 AH 2015 AD  Article Type : Article  Added Date : Sunday, August 20, 2017  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email B.C Zhu Zhu, B.C Investigator Doctorate   P Xia Xia, P Researcher Doctorate   W.K Ho Ho, W.K Researcher Doctorate   J.G Yu Yu, J.G Researcher Doctorate jiaguoyu@yahoo.com Files File Name Type Description  42696.pdf pdf   Back To Researches Page