无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2021, Vol. 53 ›› Issue (3): 44-47.doi: 10.11962/1006-4990.2020-0218

• 研究与开发 • 上一篇    下一篇

不同晶型纳米二氧化锰制备及对亚甲基蓝吸附性能

许乃才1(),史丹丹2   

  1. 1.青海师范大学化学化工学院,青海西宁810008
    2.青海省科学技术信息研究所有限公司
  • 收稿日期:2020-09-22 出版日期:2021-03-10 发布日期:2021-03-11
  • 作者简介:许乃才(1984— ),男,博士,副教授,研究方向为功能无机材料;E-mail:xunc@qhnu.edu.cn
  • 基金资助:
    青海省自然科学基金(2018-ZJ-928Q);青海省高端创新人才“千人计划”项目;中国科学院“西部之光”人才项目;青海师范大学博士科研启动基金

Preparation of manganese dioxide nanomaterials with different crystalline and their adsorption properties to methylene blue

Xu Naicai1(),Shi Dandan2   

  1. 1. School of Chemistry and Chemical Engineering,Qinghai Normal University,Xining 810008,China
    2. Institute Co.Ltd.of Science and Technology Information of Qinghai Province
  • Received:2020-09-22 Online:2021-03-10 Published:2021-03-11

摘要:

以高锰酸钾(KMnO4)为氧化剂、硫酸亚铁铵[(NH42Fe(SO42]为还原剂,用水热氧化还原反应制备了层状δ-二氧化锰和隧道型α-二氧化锰纳米材料。用X射线衍射(XRD)、扫描电镜(SEM)和氮气吸-脱附技术对产物的晶型、形貌及孔结构进行了表征。实验结果表明,δ-二氧化锰呈花状微球形貌,具有介孔结构(平均孔径为3.4 nm),BET比表面积为219 m2/g;α-二氧化锰呈纳米线束形貌,具有部分介孔结构(平均孔径为35.7 nm和154.6 nm),BET比表面积为26 m2/g。研究了不同晶型纳米二氧化锰对亚甲基蓝的吸附性能。实验结果表明,在相同条件下α-二氧化锰的吸附性能优于δ-二氧化锰,且在碱性环境下吸附效果较好。当反应时间达到120 min时,α-二氧化锰和δ-二氧化锰对亚甲基蓝的去除率分别为84.4%和82.9%。

关键词: 二氧化锰, 晶型, 形貌, 吸附, 亚甲基蓝

Abstract:

:Layered manganese dioxide(δ-MnO2) and tunneling manganese dioxide(α-MnO2) nanomaterials were prepared by using hydrothermal oxidation-reduction reaction by using KMnO4 as oxidant and(NH42 Fe(SO42 as reductant.The obta-ined products were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM) and N2 adsorption-des-orption technologies in order to investigate their crystalline,morphology and pore structural properties.The above results indi-cate that δ-MnO2 has flower-like sphere morphology with mesoporous structure(average pore diameter is 3.4 nm),and its BET specific surface area is 219 m2/g.α-MnO2 has nanowire bundles shape with partial mesopore structure(average pore di-ameter is 35.7 and 154.6 nm),and its BET specific surface area is 26 m2/g.In addition,the adsorption properties of methylene blue on different crystalline of manganese dioxide were studied which demonstrate that the adsorption performance of α-MnO2 was better than that of δ-MnO2 under the same conditions,and the absorption efficiency was even better in alkaline environ-ment.When the reaction time reached 120 min,the removal rates of α-MnO2 and δ-MnO2 toward methylene blue reach to 84.4% and 82.9%,respectively.

Key words: manganese dioxide, crystalline, morphology, adsorption, methylene blue

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