辐射还原-剥离法制备纳米金属/氮化硼纳米片复合催化剂  

Preparation of nano-metal/boron nitride nanosheets composite catalyst by a radiation-induced reduction-exfoliation method

作　　者：姜志文 朱文刚 许国庆 徐项鉴非 汪谟贞[1] 陈洪兵[2] 黄玮[2] 葛学武[1] 林铭章[3] JIANG Zhiwen;ZHUWengang;XU Guoqing;XU Xiangjianfei;WANG Mozhen;CHEN Hongbing;HUANGWei;GE Xuewu;LIN Mingzhang(CAS Key Laboratory of Soft Matter Chemistry,Department of Polymer Science and Engineering,University of Science and Technology of China,Hefei 230026,China;Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China;Department of Engineering and Applied Physics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院软物质化学重点实验室中国科学技术大学高分子科学与工程系,合肥230026 [2]中国工程物理研究院核物理与化学研究所,绵阳621900 [3]中国科学技术大学工程与应用物理系,合肥230026

出　　处：《辐射研究与辐射工艺学报》2020年第3期77-80,共4页Journal of Radiation Research and Radiation Processing

基　　金：科学挑战计划(TZ2018004);国家自然科学基金(51773189、51973205和51573174);中国科学技术大学与延长石油联合实验室(ES2060200084);中央高校基本科研业务费(WK6030000057和WK3450000004)资助。

摘　　要：在二维材料(TDM)制备领域,从六方氮化硼(h-BN)高效剥离制备氮化硼纳米片(BNNS)仍是一项具有挑战性的工作。本文提出了一种在醇水溶液中辐射诱导还原-剥离(Radiation-induced reductionexfoliation,RIRE)h-BN的新方法。该方法的核心思想是利用插层在h-BN晶体层间的Ni2+离子的原位辐射还原生成Ni纳米粒子过程中产生的体积膨胀效应,破坏h-BN晶体的层间相互作用,从而实现常温常压下,一步从h-BN上剥离出负载着约20 nm镍纳米粒子(NiNP),200 nm见方且厚度小于5 nm的氮化硼纳米片(Ni/BNNS)。所制备的Ni/BNNS表现出纳米镍优异的催化性能,并且具有良好的结构稳定性和磁分离性,可以回收循环利用。更值得注意的是,Ni/BNNS的甲醇/水分散液在模拟阳光照射下可以监测到氢气的生成,2 h内氢气的释放量以Ni质量计量为8404.3μmol/g。这项工作不仅为高效剥离制备BNNS提供了新思路,还为一步法制备新型TDM负载的纳米金属催化剂开辟了新途径,也为可见光催化剂的催化机制提出了新思考。The fabrication of boron nitride nanosheets(BNNS)by the exfoliation of hexagonal boron nitride(h-BN)remains a challenging task in the field of two-dimensional material(TDM)preparation.Radiation-induced reduction-exfoliation(RIRE)is a new method of preparation of BNNS from h-BN.RIRE is achieved by the disruption of the interlayer interactions in a h-BN crystal by means of the volume expansion caused by the formation of Ni nanoparticles(NiNPs).NiNPs are formed via the radiation reduction of Ni2⁺ions intercalated between the h-BN crystal layers.As a result,sheet-like NiNP(approximately 20 nm)-bound BNNS(Ni/BNNS)in 200 nm squares,with an average thickness of less than 5 nm,was successfully peeled from h-BN under ambient temperature and pressure conditions in an alcohol/water medium.The prepared Ni/BNNS exhibited excellent catalytic performance,good structural stability,and viability for magnetic separation,which make Ni/BNNS recyclable.More notably,when the water/methanol dispersion containing Ni/BNNS was exposed to simulated sunlight irradiation,H2 evolution of 8404.3μmol/g Ni within 2 h was detected.Therefore,this work provides a new means for the preparation of BNNS by the efficient exfoliation of h-BN,introduces a one-step preparation method for novel TDM-supported nano-metal catalysts,and offeres new insight into the catalytic mechanism of visible-light catalysts.

关 键 词：氮化硼纳米片 g 射线辐射 辐射还原 金属纳米催化剂 光催化产氢 

分 类 号：TL13[核科学技术—核能科学]