陕西科技大学学报（自然科学版）
陝西科技大學學報（自然科學版）
협서과기대학학보（자연과학판）
JOURNAL OF SHAANXI UNIVERSITY OF SCIENCE & TECHNOLOGY
2015年
4期
45-50
,共6页
欧阳海波%畅丽媛%李翠艳%黄剑锋%曹丽云%费杰%孔新刚
歐暘海波%暢麗媛%李翠豔%黃劍鋒%曹麗雲%費傑%孔新剛
구양해파%창려원%리취염%황검봉%조려운%비걸%공신강
纳米结构SiC%微观结构%光催化性能
納米結構SiC%微觀結構%光催化性能
납미결구SiC%미관결구%광최화성능
nanostructures SiC%microstructure%photocatalytic activity
以生物质碳为碳源，以SiO2和Si混合粉体为硅源，通过控制碳热还原合成的工艺条件分别合成了SiC微球、SiC／SiO2纳米串珠和SiC纳米线等．借助XRD、SEM 及T EM 等测试手段分析了三种纳米结构SiC材料的相组成及微观结构，并采用可见光催化分解亚甲基蓝溶液评估了三种纳米结构SiC材料的光催化性能．研究结果表明：SiC微球由SiC纳米颗粒组成、SiC／SiO2纳米串珠由SiC纳米线作为芯轴，非晶SiO2包覆在SiC纳米线外形成周期性的串珠结构；三种纳米结构SiC材料在300～800 nm的可见光范围内均有较强的吸收能力．SiC／SiO2纳米串珠的表层SiO2可以有效分离光生电子‐空穴，且SiO2层表面富集的羟基自由基更有利于光催化降解有机物的发生，提高了其催化效率，故SiC／SiO2纳米串珠较SiC微球和SiC纳米线具有更好的可见光催化能力．
以生物質碳為碳源，以SiO2和Si混閤粉體為硅源，通過控製碳熱還原閤成的工藝條件分彆閤成瞭SiC微毬、SiC／SiO2納米串珠和SiC納米線等．藉助XRD、SEM 及T EM 等測試手段分析瞭三種納米結構SiC材料的相組成及微觀結構，併採用可見光催化分解亞甲基藍溶液評估瞭三種納米結構SiC材料的光催化性能．研究結果錶明：SiC微毬由SiC納米顆粒組成、SiC／SiO2納米串珠由SiC納米線作為芯軸，非晶SiO2包覆在SiC納米線外形成週期性的串珠結構；三種納米結構SiC材料在300～800 nm的可見光範圍內均有較彊的吸收能力．SiC／SiO2納米串珠的錶層SiO2可以有效分離光生電子‐空穴，且SiO2層錶麵富集的羥基自由基更有利于光催化降解有機物的髮生，提高瞭其催化效率，故SiC／SiO2納米串珠較SiC微毬和SiC納米線具有更好的可見光催化能力．
이생물질탄위탄원，이SiO2화Si혼합분체위규원，통과공제탄열환원합성적공예조건분별합성료SiC미구、SiC／SiO2납미천주화SiC납미선등．차조XRD、SEM 급T EM 등측시수단분석료삼충납미결구SiC재료적상조성급미관결구，병채용가견광최화분해아갑기람용액평고료삼충납미결구SiC재료적광최화성능．연구결과표명：SiC미구유SiC납미과립조성、SiC／SiO2납미천주유SiC납미선작위심축，비정SiO2포복재SiC납미선외형성주기성적천주결구；삼충납미결구SiC재료재300～800 nm적가견광범위내균유교강적흡수능력．SiC／SiO2납미천주적표층SiO2가이유효분리광생전자‐공혈，차SiO2층표면부집적간기자유기경유리우광최화강해유궤물적발생，제고료기최화효솔，고SiC／SiO2납미천주교SiC미구화SiC납미선구유경호적가견광최화능력．
Based on biomass carbon as carbon source ,SiO2 and Si mixed powder as silicon source ,SiC microspheres ,SiC/SiO2 nanochains and SiC nanowires were prepared by control‐ling the carbon thermal reduction .T he phase and microstructure of the prepared nanostruc‐tures SiC are investigated by X‐ray diffraction (XRD) ,scanning electron microscopy (SEM ) and transmission electron microscopy (TEM ) .The visible‐light photocatalytic activity of the nanostructures SiC is evaluated by photocatalytic degradation of the methylene blue solution . Results show that the SiC microspheres are composed of SiC nanoparticles .The SiC/SiO2 nanochains are made up of the SiC core line and the amorphous SiO2 forming a periodic struc‐ture bead .The prepared nanostructures SiC present a strong absorbance in the visible‐light range of 300~800 nm .The photocatalytic activity of SiC/SiO2 nanochains are found to be better compared to that of the SiC microspheres and SiC nanowires ,which is due to the a‐morphous SiO2 that can form activated hydroxyl groups and effectively separate the photoge‐nerated electrons and holes .
