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Optimized Preparation and Cr(VI) Adsorption Property Study of Activated Blue-Coke


Affiliations
1 School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China
2 Department of Chemistry, Oakland University, Michigan, 48309, United States
3 Xi’an Gaoxin No.1 High School, Xi’an, 710065, China
 

The present work explored the use of solid waste fine blue-coke as a feedstock for the preparation of activated blue-coke and its adsorption property of Cr(VI). Chemical activation of this precursor, using KOH as activating agent, was adopted. The properties of activated blue-coke were characterized by N2 adsorption isotherms. The results show that the iodine number is 1202 mg/g, the Brunauer- Emmett-Teller (BET) surface area is 1368.18 m2/g and the total pore volume is 0.6745 cm3/g, when the activated blue-coke prepared at the optimized conditions: KOH/fine blue-coke ratio at 4, 800°C activated temperature, 60 min activated time. The adsorption properties of activated coke on Cr(VI) were discussed. The regression results show that the adsorption kinetics is more accurately expressed as a pseudo second order model. The linear correlation coefficients of the Langmuir and Freundlich isotherms were determined and the results reveal that the Freundlich isotherm fits the experimental results better.

Keywords

Coal Chemical Solid Waste, Fine Blue-Coke, KOH Activation, Adsorption, Cr(VI).
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  • Optimized Preparation and Cr(VI) Adsorption Property Study of Activated Blue-Coke

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Authors

Yuhong Tian
School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China
Shudi Hu
School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China
Xiaowei Chi
Department of Chemistry, Oakland University, Michigan, 48309, United States
Xinzhe Lan
School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China
Yonghui Song
School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China
Le Ju
Xi’an Gaoxin No.1 High School, Xi’an, 710065, China

Abstract


The present work explored the use of solid waste fine blue-coke as a feedstock for the preparation of activated blue-coke and its adsorption property of Cr(VI). Chemical activation of this precursor, using KOH as activating agent, was adopted. The properties of activated blue-coke were characterized by N2 adsorption isotherms. The results show that the iodine number is 1202 mg/g, the Brunauer- Emmett-Teller (BET) surface area is 1368.18 m2/g and the total pore volume is 0.6745 cm3/g, when the activated blue-coke prepared at the optimized conditions: KOH/fine blue-coke ratio at 4, 800°C activated temperature, 60 min activated time. The adsorption properties of activated coke on Cr(VI) were discussed. The regression results show that the adsorption kinetics is more accurately expressed as a pseudo second order model. The linear correlation coefficients of the Langmuir and Freundlich isotherms were determined and the results reveal that the Freundlich isotherm fits the experimental results better.

Keywords


Coal Chemical Solid Waste, Fine Blue-Coke, KOH Activation, Adsorption, Cr(VI).

References