文档介绍：摘要
本论文以蔗糖为原料,经H2SO4碳化—氧化和中温真空干燥等简单工艺,制备了一种新型的碳@硅复合吸附剂(CMSP)。对其制备条件进行了优化,用场发射扫描电镜(SEM)、X-ray衍射(XRD)、X光电子能谱(XPS)和红外吸收光谱(FT-IR)对所制备吸附剂、进行了表征。研究了CMSP的N2等温吸附线和脱附线,结合XPS,FT-IR和荧光光谱对该吸附剂的制备及吸附机理进行了探讨,用BET方法和BJH模型考察了其表面积和孔结构。结合XPS, FT-IR 荧光谱图分析结果研究了新型碳质吸附剂的制备机理和吸附机理。
研究了该新型新型碳@硅复合吸附剂对亚甲基蓝的吸附性能。考察了各种影响因素对吸附性能的影响,结果发现溶液pH和离子强度对吸附有很大的影响。动力学研究表明对亚甲基蓝的吸附符合一级动力学方程,等温线研究结果表明新型碳质吸附剂对亚甲基蓝的吸附属于Langmuir吸附模型,计算了热力学参数。
研究了该新型碳@硅复合吸附剂对Cr(Ⅵ)的吸附性能。考察了各种影响因素对吸附性能的影响,结果发现溶液的pH和溶液中的离子强度对吸附性能的影响较大。吸附动力学研究结果表明对Cr(Ⅵ)的吸附符合二级动力学方程,并计算了活化热力学参数△G、△S*、△H*、和△E* ,吸附等温线研究结果表明对Cr(Ⅵ)的吸附属于S型吸附等温线,说明对Cr(Ⅵ)的吸附是一个多层物理吸附过程。
制备的新型的碳@硅复合吸附剂具有优异的吸附性能,并且制备工艺简单,可作为活性炭类吸附剂的廉价替代品,具有广泛的应用前景。
关键词:微硅粉;蔗糖;吸附;亚甲基蓝;Cr(Ⅵ)
Cr(Ⅵ)
Abstract
This document reported a novel ******@micro-silica power (CMSP) composite adsorbent. The posite adsorbent was prepared by carbonation and oxidization with H2SO4, and then vacuum torrefaction in middle temperature. The preparation conditions were optimized, and the scan electron microscope (SEM), X-ray diffraction (XRD), X photoelectron spectra (XPS) and infrared absorption spectroscopy (FT-IR) were utilized to characterize this reported adsorbent, and the N2 adsorption and desorption isotherms also were studied. The surface area and pore structure of this reported adsorbent were calculated with BET method and BJH model. Combining with the analysis result of XPS, FT-IR and fluorescence spectra, the preparation mechanism and adsorption mechanism of this reported adsorbent was studied.
Base on this work, the adsorption performance of methylene blue (MC) on this reported adsorbent was studied. The impact factor of MC on CMSP, such as pH and ionic strength, were investigated. The ics research had shown the adsorbing process of MC on CMSP keep to first-order ic equation. The adsorption isotherms research shown the adsorbing process belonged to Langmuir adsorption model. Then, the thermodynamics function was calculated.
The adsorption performance of Cr(Ⅵ) on this reported adsorbent also