Developing a Novel Layered Boron Nitride-Carbon Nitride Composite with High Efficiency and Selectivity To Remove Protonated Dyes from Water
Developing a Novel Layered Boron Nitride-Carbon Nitride Composite with High Efficiency and Selectivity To Remove Protonated Dyes from Water
复制标题
开发一种新型层状氮化硼-氮化碳复合材料，可高效、高选择性地去除水中的质子化染料
DOI：
10.1021/acssuschemeng.8b05150
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发表时间：
2019-03-18
影响因子：
8.4
通讯作者：
Wang, Chao
中科院分区：
文献类型：
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作者：
Guo, Yong;Wang, Ruxia;Wang, Chao
层状氮化硼(BN)-氮化碳(CN)复合材料是由尿素在焙烧过程中的热聚合反应在600℃下焙烧而成。透射电子显微镜分析证实了BN-CN复合材料具有不同于BN纳米颗粒和CN纳米颗粒的层状结构。FTIR、X射线衍射和核磁共振结果表明，层状BN-CN复合材料很可能是在焙烧过程中BN纳米粒子中的-OH基团与CN中的-NH2基团发生脱水反应而形成的，从而将BN纳米粒子与CN连接在一起形成层状复合材料。层状BN-CN复合材料对水中中性红(NR)和孔雀石绿(MG)的去除效果较好(NR的去除量为1350.1 mg/g，浓度为220 mg/L；MG的去除量为1040.6 mg/g，浓度为120 mg/L)，而层状BN-CN复合材料对水中的甲基橙(MO)、亚甲基蓝(MB)和结晶紫(CV)的去除效率较低。在120 mg/L的浓度下，MO、MB和CV的去除量都在60 mg/g左右，NR和MG都是质子化染料，它们的正电荷来自于结合的H+。层状BN-CN复合材料对H+具有很高的亲和力，可以使去离子水的pH从最初的6.82提高到8.89。这可能是层状BN-CN复合材料对NR和MG具有较高的去除效率的原因。此外，层状BN-CN复合材料可以选择性地去除NR-MO和NR-MB溶液(或MG-MO和MG-MB溶液)中的NR(或MG)。
A layered boron nitride (BN)-carbon nitride (CN) composite has been successfully synthesized by calcinating a mixture of BN nanoparticles and urea at 600 degrees C, wherein CN is formed from the thermal polymerization of urea during the calcination process. TEM analyses confirm that the BN-CN composite has a layered structure, being different from the morphologies of BN nanoparticles and CN. FTIR, XRD, and NMR results support that the layered BN-CN composite is most likely formed via the dehydration reaction between the-OH groups in the BN nanoparticles and the -NH2 groups in CN during the calcination process, which links BN nanoparticles and CN together to form the layered composite. The layered BN-CN composite can, with high efficiency, remove Neutral Red (NR) and Malachite Green (MG) from water (NR removal quantity: 1350.1 mg/g, concentration: 220 mg/L; MG removal quantity: 1040.6 mg/g, concentration: 120 mg/L), whereas the layered BN-CN composite has low efficiency to remove Methyl Orange (MO), Methylene Blue (MB), and Crystal Violet (CV) from water. The quantities of MO, MB, and CV removed are all just around 60 mg/g with a concentration of 120 mg/L. NR and MG are both protonated dyes, and their positive charges are from the bound H+. The layered BN-CN composite has high affinity for H+, which can cause the pH of the deionized water to increase to 8.89 from the initial 6.82. This may be responsible for the high removal efficiency of the layered BN-CN composite for NR and MG. Furthermore, the layered BN-CN composite can selectively remove NR (or MG) from NR-MO and NR-MB solutions (or MG-MO and MG-MB solutions).