Nguyen Vinh Dinh, Kynicky Jindrich, Ambrozova Pavlina, Adam Vojtech
Central European Institute of Technology, Brno University of Technology, 612 00 Brno, Czech Republic.
Faculty of Chemistry, Thai Nguyen University of Sciences, 251580 Thai Nguyen, Vietnam.
Materials (Basel). 2017 Jul 11;10(7):783. doi: 10.3390/ma10070783.
The microwave-assisted synthesis of goethite nanoparticles has been studied. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential thermal analysis (DTA) and Brunauer-Emmett-Teller (BET) method. Goethite rod-like nanoparticles have been successfully synthesized in 10 min of microwave treating at 100 °C. Particle size is in the range from 30 to 60 nm in width and from 200 to 350 nm in length. BET analysis indicated that the surface area of the product is 158.31 m²g. The feasibility of Cr(VI) removal fromaqueous solution depends on the pH of the solution and contact time. The maximum adsorptionis reached at pH 4.0 and 540 min of contact time. The adsorption kinetics was analyzedby the pseudo-first- and second-order models and the results reveal that the adsorption process obeys the pseudo-second-order model. The adsorption data were fitted well with the Langmuir adsorption isotherm.
对微波辅助合成针铁矿纳米颗粒进行了研究。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、热重分析（TGA）、差热分析（DTA）和布鲁诺尔-埃米特-特勒（BET）法对样品进行了表征。在100℃下微波处理10分钟成功合成了针铁矿棒状纳米颗粒。颗粒宽度在30至60nm范围内，长度在200至350nm范围内。BET分析表明产物的表面积为158.31m²/g。从水溶液中去除Cr(VI)的可行性取决于溶液的pH值和接触时间。在pH 4.0和接触时间540分钟时达到最大吸附量。通过准一级和二级模型分析吸附动力学，结果表明吸附过程符合准二级模型。吸附数据与朗缪尔吸附等温线拟合良好。
