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Enhancement of surface properties of oil fly ash by chemical treatment

机译：通过化学处理提高粉煤灰的表面性能

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摘要

In this study, surface modification of oil fly ash (OFA), a by-product generated by oil power plants, was achieved by chemical treatment. A mixture of sulfuric and nitric acids was used to modify the surface in order to attach a carboxylic functional group to the surface of OFA. The goal of surface modification of OFA is to make its surface more compatible with nonpolar polymers in order to produce OFA/polymer composite materials with improved dispersion of OFA, and to increase OFA surface area in order to support its use as adsorbent materials in adsorptive separation and purification applications. Different acid compositions were used for treatment by gradually increasing the nitric acid concentration from 0 to 20%. Also, the effect of oxidation on surface modification was examined by introducing air to enhance the oxidation of OFA. FT1R analysis was performed to identify the different functional groups attached to OFA surface before and after the chemical treatment. Evaluation of different structural changes during the surface modification was investigated by XRD analysis. Surface morphology and spot analysis was studied by SEM technique to identify the composition of different elements present in the OFA such as carbon, oxygen and sulfur. BET analysis showed major increase in surface area after modification as well as pore size and micropore volume of OFA particles. The maximum increase in surface area was obtained with 15 vol.% HNO_3. Also, carboxylic functionalization of OFA was enhanced when air was injected.
机译：在这项研究中，通过化学处理实现了油粉煤灰（OFA）的表面改性，该粉煤灰是石油发电厂产生的副产品。为了将羧基官能团连接到OFA的表面，使用了硫酸和硝酸的混合物对表面进行了改性。 OFA的表面改性的目的是使其表面与非极性聚合物更相容，以生产具有改善的OFA分散性的OFA /聚合物复合材料，并增加OFA表面积以支持其在吸附分离中用作吸附材料。和净化应用。通过逐渐将硝酸浓度从0％增加到20％，可以使用不同的酸成分进行处理。此外，通过引入空气以增强OFA的氧化作用，研究了氧化对表面改性的影响。进行FT1R分析以鉴定化学处理之前和之后附着在OFA表面的不同官能团。通过XRD分析研究了表面改性过程中不同结构变化的评估。通过SEM技术研究了表面形态和斑点分析，以鉴定OFA中存在的不同元素（例如碳，氧和硫）的组成。 BET分析表明，改性后的表面积以及OFA颗粒的孔径和微孔体积均显着增加。用15体积％的HNO_3获得最大的表面积增加。另外，注入空气时，OFA的羧基官能度得到增强。

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  • 来源
    《Applied Surface Science》 |2011年第5期|p.1643-1650|共8页
  • 作者

    Reyad Shawabkeh; Muhammad J. Khan; Abdulhadi A. Al-Juhani; Hamad I. Al-Abdul Wahhab; Ibnelwaleed A. Hussein;

  • 作者单位

    Department of Chemical Engineering, KingFahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia;

    Department of Chemical Engineering, KingFahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia;

    Department of Chemical Engineering, KingFahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia;

    Department of Civil Engineering, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia;

    Department of Chemical Engineering, KingFahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    ash; acid treatment; surface modification; oxidation;

    机译：灰;酸处理表面改性;氧化;

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