Adsorption of COD in Coking Wastewater on Nitric Acid-Modified Blue Coke Activated Carbon

The blue coke activated carbon (BAC) modified by nitric acid at different concentrations was used as an adsorbent to remove COD from coking wastewater. Characterization of BAC was performed using N2 adsorption/desorption techniques, scanning electron microscope (SEM), Fourier transform infrared spec...

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Main Authors:	Xu Jiang, Xinzhe Lan, Yonghui Song, Xiangdong Xing
Format:	Article
Language:	English
Published:	Hindawi Limited 2019-01-01
Series:	Journal of Chemistry
Online Access:	http://dx.doi.org/10.1155/2019/8593742

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record_format	Article
spelling	doaj-b05cb1bf7ca64824906927a94d1acce52020-11-25T01:42:37ZengHindawi LimitedJournal of Chemistry2090-90632090-90712019-01-01201910.1155/2019/85937428593742Adsorption of COD in Coking Wastewater on Nitric Acid-Modified Blue Coke Activated CarbonXu Jiang0Xinzhe Lan1Yonghui Song2Xiangdong Xing3School of Metallurgical Engineering, Shaanxi Province Metallurgical Engineering and Technology Research Centre, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaSchool of Metallurgical Engineering, Shaanxi Province Metallurgical Engineering and Technology Research Centre, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaSchool of Metallurgical Engineering, Shaanxi Province Metallurgical Engineering and Technology Research Centre, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaSchool of Metallurgical Engineering, Shaanxi Province Metallurgical Engineering and Technology Research Centre, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaThe blue coke activated carbon (BAC) modified by nitric acid at different concentrations was used as an adsorbent to remove COD from coking wastewater. Characterization of BAC was performed using N2 adsorption/desorption techniques, scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), and Boehm titration. The results showed the Brunner–Emmet–Teller (BET) specific surface area and iodine value of BAC became higher after modification, and the adsorption capacity of BAC for coking wastewater was effectively improved with nitric acid modification. The optimal nitric acid concentration for modification was 3 mol/L (BAC-N3), which had more acid functional group contents than unmodified. The chemical oxygen demand (COD) removal rate was to reach 77.05% when 4 g BAC-N3 was added into 50 mL coking wastewater in 120 min with a shaking speed of 100 rpm at 25°C. Langmuir model could better describe equilibrium adsorption data by BAC-N3, and the kinetic study showed that the adsorption process was best fitted by the pseudo-second-order kinetic model.http://dx.doi.org/10.1155/2019/8593742
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Xu Jiang Xinzhe Lan Yonghui Song Xiangdong Xing
spellingShingle	Xu Jiang Xinzhe Lan Yonghui Song Xiangdong Xing Adsorption of COD in Coking Wastewater on Nitric Acid-Modified Blue Coke Activated Carbon Journal of Chemistry
author_facet	Xu Jiang Xinzhe Lan Yonghui Song Xiangdong Xing
author_sort	Xu Jiang
title	Adsorption of COD in Coking Wastewater on Nitric Acid-Modified Blue Coke Activated Carbon
title_short	Adsorption of COD in Coking Wastewater on Nitric Acid-Modified Blue Coke Activated Carbon
title_full	Adsorption of COD in Coking Wastewater on Nitric Acid-Modified Blue Coke Activated Carbon
title_fullStr	Adsorption of COD in Coking Wastewater on Nitric Acid-Modified Blue Coke Activated Carbon
title_full_unstemmed	Adsorption of COD in Coking Wastewater on Nitric Acid-Modified Blue Coke Activated Carbon
title_sort	adsorption of cod in coking wastewater on nitric acid-modified blue coke activated carbon
publisher	Hindawi Limited
series	Journal of Chemistry
issn	2090-9063 2090-9071
publishDate	2019-01-01
description	The blue coke activated carbon (BAC) modified by nitric acid at different concentrations was used as an adsorbent to remove COD from coking wastewater. Characterization of BAC was performed using N2 adsorption/desorption techniques, scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), and Boehm titration. The results showed the Brunner–Emmet–Teller (BET) specific surface area and iodine value of BAC became higher after modification, and the adsorption capacity of BAC for coking wastewater was effectively improved with nitric acid modification. The optimal nitric acid concentration for modification was 3 mol/L (BAC-N3), which had more acid functional group contents than unmodified. The chemical oxygen demand (COD) removal rate was to reach 77.05% when 4 g BAC-N3 was added into 50 mL coking wastewater in 120 min with a shaking speed of 100 rpm at 25°C. Langmuir model could better describe equilibrium adsorption data by BAC-N3, and the kinetic study showed that the adsorption process was best fitted by the pseudo-second-order kinetic model.
url	http://dx.doi.org/10.1155/2019/8593742
work_keys_str_mv	AT xujiang adsorptionofcodincokingwastewateronnitricacidmodifiedbluecokeactivatedcarbon AT xinzhelan adsorptionofcodincokingwastewateronnitricacidmodifiedbluecokeactivatedcarbon AT yonghuisong adsorptionofcodincokingwastewateronnitricacidmodifiedbluecokeactivatedcarbon AT xiangdongxing adsorptionofcodincokingwastewateronnitricacidmodifiedbluecokeactivatedcarbon
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Adsorption of COD in Coking Wastewater on Nitric Acid-Modified Blue Coke Activated Carbon

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