Synthesis of activated carbons from water hyacinth biomass and its application as adsorbents in water pollution control

IF 1 4区化学 Q4 CHEMISTRY, MULTIDISCIPLINARY

Journal of The Serbian Chemical Society Pub Date : 2022-01-01 DOI:10.2298/jsc212121006m

Ahmad Mohammaad, M. Kijevčanin

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引用次数: 2

Abstract

The water hyacinth biomass was used for the synthesis of activated carbons in process of chemical activation with ZnCl2, followed by controlled pyrolysis. The applied impregnation weight ratios ZnCl2 and dry hyacinth biomass were in the range of 0.5 - 3.5. The carbonization was conducted at four different temperatures (T= 400-700?C) under an inert atmosphere. The highest yield of activated carbon was obtained for the impregnation ratio of 0.5 and carbonization temperature of 400?C. The samples were characterized using elemental analysis, adsorption-desorption isotherms of nitrogen and SEM analysis. The activated carbon obtained with an impregnation ratio 2.0 and carbonization temperature of 500?C (2.0AC500) showed the highest values of specific surface area and total pore volume of 1317 m2 g-1 and 0.697 cm3 g-1, respectively. The adsorption of glyphosate, pesticide with a strong negative environmental impact, was fast process, with equilibrium time of 120 min. The adsorption isotherms were fitted with Langmuir and Freundlich model. The Langmuir adsorption capacity of qmax=240.8 mg g-1 for 2.0AC500 classified the selected adsorbent as a very efficient one. The tested adsorption process followed the kinetics of the pseudo-second-order model.

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水葫芦生物质活性炭的合成及其吸附剂在水污染控制中的应用

以水葫芦生物量为原料，通过ZnCl2化学活化合成活性炭，然后进行可控热解。ZnCl2与干风信子生物量的浸渍质量比在0.5 ~ 3.5之间。在惰性气氛下，在4种不同温度(T= 400-700℃)下进行炭化。浸渍比为0.5、炭化温度为400℃时，活性炭得率最高。采用元素分析、氮的吸附-解吸等温线和扫描电镜对样品进行了表征。浸渍比为2.0，炭化温度为500?C (2.0AC500)的比表面积和总孔体积最高，分别为1317 m2 g-1和0.697 cm3 g-1。吸附过程快速，平衡时间为120 min，吸附等温线符合Langmuir和Freundlich模型。对2.0AC500的Langmuir吸附量qmax=240.8 mg g-1，为高效吸附剂。吸附过程符合准二阶动力学模型。

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来源期刊

Journal of The Serbian Chemical Society 化学-化学综合

CiteScore

1.80

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： The Journal of the Serbian Chemical Society -JSCS (formerly Glasnik Hemijskog društva Beograd) publishes articles original papers that have not been published previously, from the fields of fundamental and applied chemistry: Theoretical Chemistry, Organic Chemistry, Biochemistry and Biotechnology, Food Chemistry, Technology and Engineering, Inorganic Chemistry, Polymers, Analytical Chemistry, Physical Chemistry, Spectroscopy, Electrochemistry, Thermodynamics, Chemical Engineering, Textile Engineering, Materials, Ceramics, Metallurgy, Geochemistry, Environmental Chemistry, History of and Education in Chemistry.