银负载与羟基化协同改性氮化硼及其光催化性能研究

doi:10.16552/j.cnki.issn1001-1625.2026.0017

摘要/Abstract

摘要：

为提升六方氮化硼（h-BN）的可见光催化活性，研究采用边缘羟基化与银纳米颗粒负载的协同改性策略。通过水热法在h-BN边缘引入B—OH基团，进而利用自组装与水热还原过程负载银纳米颗粒，成功制备了Ag/h-BN-OH复合材料。采用X射线衍射、透射电子显微镜、X射线光电子能谱等手段对材料的结构与组成进行表征；通过紫外-可见漫反射光谱、电化学阻抗谱、瞬态光电流响应及电子顺磁共振波谱系统分析了材料的光电化学性质。结果表明，边缘羟基化显著提高了银纳米颗粒的负载量（达5.3%），且银颗粒的等离子体共振效应将材料光吸收边红移至500 nm，表观带隙降至2.09 eV，有效拓宽了可见光响应范围。复合材料表现出优异的电荷分离效率与更强的羟基自由基生成能力。在可见光照射下，其对罗丹明B的60 min降解率高达91%。研究证实，通过构筑边缘羟基活性位点与等离子体金属的协同体系，可有效克服宽带隙h-BN中光生载流子复合速度快、可见光利用效率低等核心瓶颈，为设计高效氮化硼基光催化材料提供了新思路。

关键词: 六方氮化硼, 银纳米颗粒, 罗丹明B, 光催化, 羟基化, 表面等离子体共振, 可见光降解

Abstract:

To enhance the visible-light photocatalytic activity of hexagonal boron nitride （h-BN）， a synergistic modification strategy combining edge hydroxylation and silver nanoparticle loading was proposed and implemented. The Ag/h-BN-OH composite was successfully synthesized via a hydrothermal process to introduce B—OH groups at the h-BN edges， followed by a self-assembly and hydrothermal reduction step to anchor silver nanoparticles. The material’s structure and composition were characterized by X-ray diffraction， transmission electron microscopy， and X-ray photoelectron spectroscopy. Its optoelectrochemical properties were systematically investigated using ultraviolet-visible diffuse reflectance spectroscopy， electrochemical impedance spectroscopy， transient photocurrent response， and electron paramagnetic resonance spectroscopy. The results indicate that edge hydroxylation significantly increases the loading amount of silver nanoparticles （up to 5.3%）. The surface plasmon resonance effect of the silver nanoparticles effectively extends the light absorption edge to 500 nm and reduces the apparent band gap to 2.09 eV， thereby broadening the visible-light response. The composite demonstrates superior charge separation efficiency and enhanced generation capability of hydroxyl radicals. Under visible-light irradiation， it achieves a high degradation rate of 91% for Rhodamine B within 60 min. This study confirms that constructing a synergistic system comprising edge hydroxyl active sites and plasmonic metals can effectively address the core limitations of wide-bandgap h-BN， namely rapid recombination of photogenerated carriers and low visible-light utilization efficiency， offering a new pathway for designing efficient boron nitride-based photocatalytic materials.

Key words: hexagonal boron nitride, silver nanoparticles, Rhodamine B, photocatalysis, hydroxylation, surface plasmon resonance, vbisible-light degradation

中图分类号:

TQ426.6

盛海龙, 耿永娟, 周安杰, 李绍纯. 银负载与羟基化协同改性氮化硼及其光催化性能研究[J]. 硅酸盐通报, 2026, 45(7): 2531-2539.

SHENG Hailong, GENG Yongjuan, ZHOU Anjie, LI Shaochun. Synergistic Modification of Boron Nitride with Silver Loading and Hydroxylation for Enhanced Photocatalysis[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(7): 2531-2539.

图/表 8

图1 复合材料的Zeta电位和XRD谱

Fig.1 Zeta potential and XRD patterns of composite materials

图2 复合材料的TEM及EDS元素分布图

Fig.2 TEM images and EDS elemental mapping of composite materials

图3 复合材料的XPS全谱和高分辨谱

Fig.3 XPS survey spectra and corresponding high-resolution spectra of composite materials

图4 复合材料的BET分析

Fig.4 BET analysis of composite materials

图5 复合材料的光吸收

Fig.5 Optical absorption of composite materials

图6 复合材料的电荷分离与传输性能

Fig.6 Charge separation and transfer properties of composite materials

图7 复合材料的羟基自由基EPR谱

Fig.7 EPR spectra of hydroxyl radical of composite materials

图8 复合材料对RhB的光催化降解性能对比

Fig.8 Photocatalytic degradation performance comparison of RhB by composite materials

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