• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Removal of phosphate from aqueous solution by SiO2–biochar nanocomposites prepared by pyrolysis of vermiculite treated algal biomass
【24h】

Removal of phosphate from aqueous solution by SiO2–biochar nanocomposites prepared by pyrolysis of vermiculite treated algal biomass

机译：通过SiO2-Biochar纳米复合材料从水溶液中除去磷酸盐，通过蛭石处理的藻类生物量热解制备

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The present work describes the fabrication of SiO _(2) –biochar nanocomposites by pyrolysis of vermiculite treated algal biomass. Physicochemical properties of the SiO _(2) –biochar nanocomposites were studied systematically by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and energy-dispersive X-ray analysis (EDX). Structure and morphology analysis of the sample showed that the SiO _(2) particles were nanosized and uniformly formed on the carbon surface of the biochar. Effects of initial phosphate concentration, contact time, and pH on the adsorption capacity of SiO _(2) –biochar nanocomposites were investigated in detail. Adsorption experiments revealed that the initial pH of solution could affect the adsorption of phosphate onto the SiO _(2) –biochar nanocomposite. Of the mathematical models used to describe the adsorption kinetics of phosphate removal by the biochars, the pseudo-second-order model showed the best fit. Langmuir isotherm fitted the experimental data of phosphate adsorption onto the biochars better than the Freundlich and Redlich–Peterson adsorption model. Compared to the unmodified biochar, the SiO _(2) –biochar nanocomposite showed a much greater ability to remove phosphate from aqueous solution, probably because the SiO _(2) particles on the carbon surface served as sorption sites through electrostatic interactions. In addition, the adsorbed SiO _(2) –biochar nanocomposites could be effectively regenerated by NaOH solution. Our results suggest that SiO _(2) –biochar nanocomposites converted from vermiculite-treated algal biomass are promising alternative adsorbents, which can be used to reduce phosphate from water.
机译：本作者通过对蛭石处理藻类生物量的热解来描述SiO _（2）-BiOchar纳米复合材料的制备。通过X射线衍射（XRD），傅里叶变换红外光谱（FT-IR），扫描电子显微镜（SEM）和能量分散X射线分析（X射线）和能量分散X射线分析系统系统地研究了SiO _（2）-Biochar纳米复合材料的物理化学性质。 EDX）。样品的结构和形态学分析表明，SiO _（2）颗粒在BioChar的碳表面上纳米颗粒和均匀形成。详细研究了初始磷酸盐浓度，接触时间和pH对SiO_（2）-BiOchar纳米复合材料的吸附能力的影响。吸附实验表明，溶液的初始pH可能会影响磷酸盐在SiO_（2）-BiOchar纳米复合材料上的吸附。用于描述Biochars的磷酸盐除去的吸附动力学的数学模型，伪二阶模型显示出最合适的。 Langmuir等温机比Freundlich和Redlich-Peterson吸附模型更好地拟合磷酸盐吸附到Biochars上的实验数据。与未经修改的生物炭相比，SiO_（2）-Biochar纳米复合材料显示出从水溶液中除去磷酸盐的更大能力，可能是通过静电相互作用用作吸附位点的SiO_（2）颗粒。另外，吸附的SiO_（2）-Biochar纳米复合材料可以通过NaOH溶液有效地再生。我们的研究结果表明，从蛭石处理的藻类生物量转化的SiO _（2）-Biochar纳米复合材料是有前途的替代吸附剂，可用于减少水中的磷酸盐。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号