Isoelectric point and adsorption activity of porous g-C3N4
Isoelectric point and adsorption activity of porous g-C3N4
复制标题
多孔g-C3N4的等电点和吸附活性
DOI：
10.1016/j.apsusc.2015.03.086
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发表时间：
2015-07
影响因子：
6.7
通讯作者：
Yu, Jiaguo
中科院分区：
文献类型：
--
作者：
Zhu, Bicheng;Xia, Pengfei;Ho, Wingkei;Yu, Jiaguo
等电点（IEP）是许多化合物（例如氧化物、氢氧化物和氮化物）的重要物理化学参数，并且可以有助于估计化合物颗粒在各种pH条件下的表面电荷。本文采用三聚氰胺、硫脲和尿素直接加热法合成了三种类型的石墨碳氮化物（g-C3 N4）。制备的样品表现出不同的微观结构和IEPs，影响其吸附活性。在微观结构的差异导致在合成过程中使用的各种前体。所得g-C3 N4的IEP约为4-5，这是由于g-C3 N4表面上的氢离子、氢氧根离子和胺基之间的化学反应平衡。由硫脲制备的g-C3 N4的IEP低于由三聚氰胺和尿素制备的相应样品。以尿素和硫脲为原料制备的g-C3 N4对亚甲基蓝具有良好的吸附性能，是一种很有前途的吸附剂。本工作为合成g-C3 N4的前驱体的选择以及g-C3 N4与其他化合物在溶液中的合成提供了有益的参考。
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-C3N4were 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-C3N4surface. The IEP of g-C3N4prepared from thiourea was lower than those of the corresponding samples prepared from melamine and urea. The adsorption activity of methylene blue on g-C3N4prepared from urea and thiourea was excellent, which indicates that g-C3N4is a promising adsorbent. This work provides a useful reference for choosing precursors with which to prepare g-C3N4and combining g-C3N4with other compounds in solution.
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