纳米硫化锰的生物制备、性能表征及其形貌调控

发布时间：2018-06-05 12:48

  本文选题：生物制备 + 纳米硫化锰　； 参考：《北京理工大学》2015年硕士论文

【摘要】：硫化锰（MnS）是一种具有反铁磁性的金属硫化物，并且是具有较宽禁带宽度的半导体材料，在短波长磁光性纳米器件、稀磁材料、光化学材料等领域有重要应用。 CdS，ZnS，As2S3等金属硫化物已经成功实现生物制备，然而针对MnS的微生物合成方法尚未见报道。这是由于CdS，ZnS，As2S3具有极低的溶度积常数，在溶液中很容易生成沉淀；而MnS的Mn2+溶度积高于对应的磷酸盐和氢氧化物，溶液中的PO43-和OH-很容易与S2-争夺Mn2+，形成Mn3(PO4)2和Mn(OH)2杂质，降低反应产物的纯度。 本研究选育出了一种新型高效硫酸盐还原菌Clostridiaceae sp.，并且通过两种途径实现高纯度MnS的生物制备：第一，严格控制培养基的PO43-浓度和pH值，从而阻止Mn3(PO4)2和Mn(OH)2的生成，，获得边长2~3μm、厚度200~300nm的六边形MnS颗粒；第二，通过以Mn2+与铬黑T的络合物作为锰源，利用空间位阻效应阻止PO43-和OH-对Mn2+的进攻，从而在高磷酸根浓度和pH下通过选择性沉淀获得高纯度棱台状MnS颗粒。本实验对生物制备所得MnS材料的光学性能和磁学性能进行了表征。
[Abstract]:Manganese sulphide (MNS) is an antiferromagnetic metal sulfide and a semiconductor material with wide bandgap. It has important applications in the field of short-wavelength magneto-optical nanodevices dilute magnetic materials photochemical materials and so on. The biosynthesis of metal sulfides such as CDs and ZnSN As2S3 has been carried out successfully. However, the method of microbial synthesis for MnS has not been reported. This is due to the extremely low solubility product constant of CdSZZN As2S3, which makes it easy to precipitate in solution, while the solubility product of Mn2 of MnS is higher than that of corresponding phosphate and hydroxide. PO43- and OH- in solution easily compete for Mn2 with S2- to form Mn3(PO4)2 and Mn(OH)2 impurities. The purity of the product was reduced. In this study, a new type of high efficient sulfate reducing bacteria Clostridiaceae sp., was selected, and the biological preparation of high purity MnS was realized by two ways: firstly, the concentration and pH of PO43- in the medium were strictly controlled, so as to prevent the formation of Mn3(PO4)2 and Mn(OH)2. The hexagonal MnS particles with 2 渭 m in length and 3 渭 m in thickness of 200~300nm were obtained. Secondly, by using the complex of Mn2 and chrome black T as manganese source, the space steric resistance effect was used to prevent the attack of PO43- and OH- on Mn2. Therefore, high purity MnS particles were obtained by selective precipitation at high phosphate concentration and pH. The optical and magnetic properties of biologically prepared MnS materials were characterized.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ137.12

【参考文献】

相关期刊论文 前1条

1 高善民,孙树声,刘兆明;纳米材料的应用前景展望[J];化学世界;2000年11期

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