天然闪锌矿矿物学特征与光催化性能

发布时间：2018-06-15 19:27

本文选题：天然闪锌矿 + 禁带宽度　；参考：《岩石矿物学杂志》2017年06期

【摘要】：本文采集了我国19个产地的天然闪锌矿进行矿物学和光催化性能研究。样品皆为立方Zn S结构,化学成分变化较大,其中Fe对闪锌矿中Zn的替代范围为0.235%~14.826%(质量分数,下同),Cd对闪锌矿中Zn的替代范围为0.133%~1.576%。闪锌矿中Fe含量由低到高,导致颜色由浅变深直至呈黑色,半导体禁带宽度由大变小,估算获得天然闪锌矿的禁带宽度范围为3.18~2.28 e V,明显低于纯Zn S禁带宽度3.68 e V,光催化响应均在可见光范围。验证光催化实验结果表明含Fe较低、含Cd较高的天然闪锌矿可见光催化还原降解甲基橙的效果较佳,如可见光下1 g/L闪锌矿样品(含铁4.262%,含镉1.576%)对30 mg/L甲基橙催化反应4 h后的脱色降解率达到82.11%。天然闪锌矿中Fe含量影响着禁带宽度和光响应范围,Cd含量影响着光催化性能,为高附加值开发利用贱金属资源天然闪锌矿提供了科学依据。
[Abstract]:In this paper, the mineralogical and photocatalytic properties of 19 natural sphalerite from China were studied. The samples all have cubic ZnS structure, and the chemical composition changes greatly. The substitution range of Fe for Zn in sphalerite is 0.235 and 14.826 (mass fraction, the substitution range of CD for Zn in sphalerite is 0.133 and 1.576). The content of Fe in sphalerite is from low to high, which results in the color changing from light to deep to black, and the band gap of semiconductor decreases from large to small. The band gap of natural sphalerite is estimated to be 3.18 ~ 2.28 EV, which is obviously lower than that of pure Zn S (3.68 EV), and the photocatalytic response is in the visible range. The results of photocatalytic experiments showed that natural sphalerite with lower Fe content and higher CD content could be used to reduce methyl orange by visible light. For example, the decolorization and degradation rate of 1 g / L sphalerite (containing iron 4.262, cadmium 1.576) to 30 mg / L methyl orange for 4 h is 82.11. The content of Fe in natural sphalerite affects the width of band gap and the range of photoresponse, and the content of CD affects the photocatalytic performance, which provides a scientific basis for the exploitation and utilization of natural sphalerite of base metal resources with high added value.
【作者单位】：有色金属成矿预测与地质环境监测教育部重点实验室中南大学地球科学与信息物理学院;
【基金】：国家重点基础研究发展计划“973项目”(410020010)~~
【分类号】：P578.23

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