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沸石蔗渣粉煤灰作为一种低成本的吸附剂用于捕获对硝基苯酚:平衡、动力学和柱研究。

Zeolitic bagasse fly ash as a low-cost sorbent for the sequestration of p-nitrophenol: equilibrium, kinetics, and column studies.

机构信息

Department of Chemistry, Veer Narmad South Gujarat University, Surat 395007, Gujarat, India.

出版信息

Environ Sci Pollut Res Int. 2012 May;19(4):1171-86. doi: 10.1007/s11356-011-0638-6. Epub 2011 Oct 19.

Abstract

PURPOSE

The purpose of the research is to investigate the application of bagasse fly ash, a sugar industry solid waste for the synthesis of zeolites and their behavior for the sorption of p-nitrophenol (p-NP).

METHODS

Zeolitic materials were prepared from bagasse fly ash using alkaline hydrothermal (CZBFA) and fusion (FZBFA) treatment. Comparative batch sorption studies of prepared zeolitic material and virgin material were undertaken to determine their capacities for removal of p-nitrophenol.

RESULTS

PXRD patterns revealed that zeolite P and analcime were the dominant contents of synthesized zeolitic material. Chemical composition, morphology, and crystalline nature of CZBFA and FZBFA were characterized by XRF, FTIR, and SEM. The Langmuir, Freundlich, Dubinin Redushkwich, and Temkin sorption isotherms were applied to compare the sorption nature and capacity of synthesized CZBFA and FZBFA with virgin BFA. For each sorbent-p-NP system, a pseudo-second-order kinetic model described the sorption kinetics accurately. The thermodynamics of the p-NP-sorbent systems exhibit an exothermic sorption process. Intraparticle diffusion model shows that the sorption rate was controlled by film diffusion followed by pore diffusion. Regeneration of sorbents was carried out by desorption studies with HCl, NaOH, and SDS detergent. The column studies were performed for the practical utility of sorbents, and breakthrough curve were obtained, which exhibit higher sorption capacity than batch method.

CONCLUSION

The sorption capacities of the synthesized zeolites had improved sorption capacities for the sequestration of p-NP and can be utilized as low-cost sorbents for treatment of p-nitrophenolic wastewater.

摘要

目的

本研究的目的是探讨糖业固体废弃物蔗渣飞灰在合成沸石及其对 p-硝基苯酚(p-NP)吸附行为中的应用。

方法

采用碱性水热(CZBFA)和熔融(FZBFA)处理,从蔗渣飞灰中制备沸石材料。进行了制备的沸石材料和原始材料的比较批处理吸附研究,以确定它们对 p-硝基苯酚的去除能力。

结果

粉末 X 射线衍射(PXRD)图谱表明,合成沸石材料的主要成分是沸石 P 和方沸石。CZBFA 和 FZBFA 的化学组成、形态和晶体性质通过 X 射线荧光(XRF)、傅里叶变换红外光谱(FTIR)和扫描电子显微镜(SEM)进行了表征。应用 Langmuir、Freundlich、Dubinin Redushkwich 和 Temkin 吸附等温线比较了合成 CZBFA 和 FZBFA 与原始 BFA 的吸附性质和容量。对于每个吸附剂-p-NP 体系,准二级动力学模型准确描述了吸附动力学。p-NP-吸附剂体系的热力学表明吸附过程是放热的。内扩散模型表明,吸附速率受膜扩散控制,然后是孔扩散。通过使用 HCl、NaOH 和 SDS 洗涤剂进行解吸研究来进行吸附剂的再生。进行了柱研究以实现吸附剂的实际应用,并获得了穿透曲线,其显示出比批处理方法更高的吸附容量。

结论

合成沸石的吸附容量提高了对 p-NP 的螯合能力,可用作处理 p-硝基苯酚废水的低成本吸附剂。

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