摘要：采用低温水热法在硅藻土上原位生长花片状纳米氧化锰制成吸附剂,采用X射线衍射、扫描电镜、透射电镜、高分辨透射电镜、N₂吸脱附等对样品进行分析、表征。结果表明,反应时间为8 h时,所得样品比表面积为141 m²/g,累积体积分数为50%时对应的颗粒粒径d₅₀为35.14μm,对质量浓度为10 mg/L的Cr(Ⅵ)、As(Ⅴ)污水的去除率分别为100%、99.98%,最大吸附量分别为157.6、93.2 mg/g。

关键词：硅藻土；原位生长；纳米氧化锰；吸附

Abstract: The adsorbents of flowerlike nano-sized MnO2 in-situ grown on diatomite were prepared using the hydrothermal method. The samples were characterized by XRD， SEM， TEM， HRTEM， and N₂ adsorptiondesorption methods. The results indicate that the sample obtained after hydrothermal treatment for 8 h shows the surface area of 141 m²/g and the particle diameter corresponding to accumulate volume fraction of 50% （d₅₀）is 35.14 μm. The Cr（VI） and As（V） removal efficiencies are 100% and 99.98% with the aqueous solution mass concentration of 10 mg/L. The maximum capacities for Cr （VI） and As （V） adsorption are respectively 157.6 and 93.2 mg/g. 

Keywords: diatomite; in-situ growth; flowerlike nano-sized MnO2; adsorption