Preparative Parameter Effects on Synthesis of Birnessite by O2 Oxidation

FENG Xiong-Han; ZU Yan-Qun; TAN Wen-Feng; LIU Fan

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Preparative Parameter Effects on Synthesis of Birnessite by O2 Oxidation

机译：制备参数对O2氧化合成水钠锰矿的影响

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Birnessite occurs in a wide variety of natural environments, and plays an important role in soil chemistry.A modified Stahli procedure was used to synthesize sodium birnessite in an alkali medium by O2 oxidation.The effects of preparative parameters on the synthesis of birnessite, such as pretreatment on solutions with N2,reaction temperature, O2 flow rate, fluxion velocity of the reaction suspension, and dehydration conditions were investigated. The fluxion velocity of the reactive suspension and O2 flow rate significantly influenced the synthesis of birnessite. Vigorous stirring raised the fluxion velocity of the reaction suspension and easily allowed synthesis of pure crystalline birnessite. However pretreatment of the reacting solutions with N2 and the reaction temperature had little effect on the synthesis. Diffusion of O2 was the controlling step during the course of oxidation. The optimum synthetic conditions for pure birnessite were: a NaOH to Mn molar ratio of 13.7, an O2 flow rate of 2 L min-1, and oxidation for 5 hours with vigorous stirring at normal temperatures. The chemical composition of the synthesized pure birnessite was Nao.25MnO2.07·0.66H2O.

机译：水钠锰矿存在于多种自然环境中，并且在土壤化学中起着重要作用。采用改良的Stahli程序通过O2氧化在碱性介质中合成水钠锰矿，制备参数对水钠锰矿的合成如研究了N2溶液的预处理，反应温度，O2流速，反应悬浮液的通量速度和脱水条件。反应性悬浮液的通量速度和氧气流速显着影响水钠锰矿的合成。剧烈搅拌提高了反应悬浮液的通量速度，并易于合成纯结晶水钠锰矿。然而，用N 2预处理反应溶液和反应温度对合成几乎没有影响。 O 2的扩散是氧化过程中的控制步骤。纯水钠锰矿的最佳合成条件为：NaOH与Mn的摩尔比为13.7，O2流量为2 L min-1，并在常温下剧烈搅拌氧化5小时。合成的纯水钠锰矿的化学组成为Nao.25MnO2.07·0.66H2O。

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《土壤圈（英文版）》 |2004年第1期|63-70|共8页
作者
FENG Xiong-Han; ZU Yan-Qun; TAN Wen-Feng; LIU Fan;
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作者单位

Key Laboratory of Subtropical Soil Resources and Environment,Chinese Agricultural Ministry, Huazhong Agricultural University, Wuhan 430070 China;

Key Laboratory of Subtropical Soil Resources and Environment,Chinese Agricultural Ministry, Huazhong Agricultural University, Wuhan 430070 China;

College of Resources and Environment, Yunnan Agricultural University, Yunnan 650201 China;

Key Laboratory of Subtropical Soil Resources and Environment,Chinese Agricultural Ministry, Huazhong Agricultural University, Wuhan 430070 China;

Key Laboratory of Subtropical Soil Resources and Environment,Chinese Agricultural Ministry, Huazhong Agricultural University, Wuhan 430070 China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
birnessite; buserite; manganese oxide; preparative parameter; synthesis;

机译：水钠锰矿;堇青石;氧化锰;制备参数;合成;

Preparative Parameter Effects on Synthesis of Birnessite by O2 Oxidation

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