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Microwave-assisted synthesis of coal fly ash-based zeolites for removal of ammonium from urine

机译：微波辅助合成煤粉煤灰基沸石去除尿液中的铵

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摘要

Zeolites synthesized from biomass waste materials offer a great opportunity in the sustainable utilization of the waste. In this work, energy-efficient processes (i.e. microwave and ultrasound irradiation) were used to synthesize pure phase sodalite (zeolite) from coal fly ash obtained from a power plant in South Africa. The pure-phase sodalite was obtained with a comparatively higher surface area (16 m(2) g(-1)) and cation exchange capacity (2.92 meq. g(-1)) with 40 min total reaction time. The removal of ammonium from urine was carried out using (i) the coal fly ash-derived sodalite, (ii) raw coal fly ash and (iii) a commercially available natural zeolite (clinoptilolite). The pure phase sodalite exhibited the highest removal efficiency of about 82% and 73% in synthetic and real hydrolyzed urine respectively. The adsorption process followed the pseudo second-order kinetic model and the Freundlich adsorption isotherm, indicating that the adsorption process occurred on a heterogeneous surface.
机译：从生物质废料中合成的沸石在垃圾的可持续利用中提供了一个很好的机会。在这项工作中，使用节能的方法（即微波和超声波照射），用于将纯相钠（沸石）合成从南非的发电厂获得的煤粉煤灰。用相对较高的表面积（16m（2 )g（-1））和阳离子交换容量（2.92meq.g（-1）），得到40分钟的总反应时间，得到纯相索索罗石。使用（i）煤粉煤灰衍生的钠盐，（ii）原煤飞灰和（iii）市售天然沸石（Clinoptilolite）来进行尿​​液中的尿液中的除去铵。纯相索索罗石分别在合成和实际水解尿液中表现出约82％和73％的最高去除效率。吸附过程跟随伪二阶动力学模型和Freundlich吸附等温线，表明吸附过程在异质表面上发生。

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  • 来源
    《RSC Advances》 |2020年第4期|共12页
  • 作者

    Makgabutlane Boitumelo; Nthunya Lebea N.; Musyoka Nicholas; Dladla Bongumusa S.; Nxumalo Edward N.; Mhlanga Sabelo D.;

  • 作者单位

    Univ South Africa Coll Sci Engn &

    Technol Nanotechnol &

    Water Sustainabil Res Unit ZA-1709 Johannesburg South Africa;

    Tshwane Univ Technol Dept Chem Met &

    Mat Engn Private Bag X680 ZA-0001 Pretoria South Africa;

    CSIR Energy Ctr HySA Infrastruct Ctr Competence Meiring Naude Rd ZA-0001 Pretoria South Africa;

    Univ South Africa Coll Sci Engn &

    Technol Dept Chem ZA-1709 Johannesburg South Africa;

    Univ South Africa Coll Sci Engn &

    Technol Nanotechnol &

    Water Sustainabil Res Unit ZA-1709 Johannesburg South Africa;

    Univ South Africa Coll Sci Engn &

    Technol Nanotechnol &

    Water Sustainabil Res Unit ZA-1709 Johannesburg South Africa;

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  • 正文语种 eng
  • 中图分类 化学;
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