CAJ | 학술논문

以聚乙二醇(PEG)为模板剂,氯化锡为锡源,尿素为沉淀剂,采用水热法合成出高比表面积的蠕虫状介孔四方相金红石型SnO_2.考察了PEG分子量及其浓度、水热温度和焙烧温度对SnO_2孔结构和形貌的影响.采用X射线衍射、N2吸附-脱附、透射电镜、红外光谱和紫外-可见光谱等技术对样品进行了表征.结果表明,模板剂可被水洗除去,PEG分子量对介孔SnO_2的比表面积影响不大,而PEG浓度、水热温度和焙烧温度的影响较大.在以分子量为6000的PEG与Sn的摩尔比为0.01的条件下,于120℃水热处理29h后可合成出比表面积高达161m~2/g和平均孔径为2.6nm的蠕虫状介孔SnO_2.所制得样品具有较好的紫外光吸收件能,适宜用作催化剂、载体和气体传感器等.
이취을이순(PEG)위모판제,록화석위석원,뇨소위침정제,채용수열법합성출고비표면적적연충상개공사방상금홍석형SnO_2.고찰료PEG분자량급기농도、수열온도화배소온도대SnO_2공결구화형모적영향.채용X사선연사、N2흡부-탈부、투사전경、홍외광보화자외-가견광보등기술대양품진행료표정.결과표명,모판제가피수세제거,PEG분자량대개공SnO_2적비표면적영향불대,이PEG농도、수열온도화배소온도적영향교대.재이분자량위6000적PEG여Sn적마이비위0.01적조건하,우120℃수열처리29h후가합성출비표면적고체161m~2/g화평균공경위2.6nm적연충상개공SnO_2.소제득양품구유교호적자외광흡수건능,괄의용작최화제、재체화기체전감기등.
High-surface-area wormhole-like mesoporous SnO_2 with a tetragonal mille-type structure was fabricated adopting the hydrothermal strategy using poly(ethylene glycol) (PEG) as the template, tin chloride as the tin source, and urea as the precipitating agent. The effects of PEG with different molecular weights and its concentration, hydrothermal temperature, and calcination temperature on the pore structure and morphology of SnO_2 were examined. The physical properties of these materials were characterized by X-ray diffraction, nitrogen adsorption-desorption, transmission electron microscopy, selected-aren electron diffraction, infrared spectroscopy, and ultraviolet-visible diffuse reflection spectroscopy. It is shown that the PEG template could be removed by washing, no significant impact of PEG molecular weight was observed on the surface area of the mesoporous SnO_2 samples, but the factors such as PEG concentration, hydrothermal temperature, and calcination temperature exerted considerable influence on the pore structure of the SnO_2 samples. After the hydrothermal treatment at 120℃ for 29 h with the molar ratio of PEG (with a molecular weight of 6000 g/mol) to Sn of 0.01, a wormhole-like mesoporous SnO_2 sample with a high surface area of 161 m~2/g and an average pore size of 2.6 nm was generated. The SnO_2 samples exhibited good behavior in UV-light absorption. These porous materials are suitable for use as catalysts, supports, and gas sensors.