本文選題：生物制備 + 納米硫化錳��； 參考：《北京理工大學(xué)》2015年碩士論文

【摘要】：硫化錳（MnS）是一種具有反鐵磁性的金屬硫化物，并且是具有較寬禁帶寬度的半導(dǎo)體材料，在短波長磁光性納米器件、稀磁材料、光化學(xué)材料等領(lǐng)域有重要應(yīng)用。 CdS，ZnS，As2S3等金屬硫化物已經(jīng)成功實(shí)現(xiàn)生物制備，然而針對(duì)MnS的微生物合成方法尚未見報(bào)道。這是由于CdS，ZnS，As2S3具有極低的溶度積常數(shù)，在溶液中很容易生成沉淀；而MnS的Mn2+溶度積高于對(duì)應(yīng)的磷酸鹽和氫氧化物，溶液中的PO43-和OH-很容易與S2-爭奪Mn2+，形成Mn3(PO4)2和Mn(OH)2雜質(zhì)，降低反應(yīng)產(chǎn)物的純度。 本研究選育出了一種新型高效硫酸鹽還原菌Clostridiaceae sp.，并且通過兩種途徑實(shí)現(xiàn)高純度MnS的生物制備：第一，嚴(yán)格控制培養(yǎng)基的PO43-濃度和pH值，從而阻止Mn3(PO4)2和Mn(OH)2的生成，，獲得邊長2~3μm、厚度200~300nm的六邊形MnS顆粒；第二，通過以Mn2+與鉻黑T的絡(luò)合物作為錳源，利用空間位阻效應(yīng)阻止PO43-和OH-對(duì)Mn2+的進(jìn)攻，從而在高磷酸根濃度和pH下通過選擇性沉淀獲得高純度棱臺(tái)狀MnS顆粒。本實(shí)驗(yàn)對(duì)生物制備所得MnS材料的光學(xué)性能和磁學(xué)性能進(jìn)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.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ137.12

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 高善民,孫樹聲,劉兆明;納米材料的應(yīng)用前景展望[J];化學(xué)世界;2000年11期

本文編號(hào)：1982042