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J Korean Soc Environ Eng > Volume 42(10); 2020 > Article
J Korean Soc Environ Eng 2020;42(10): 472-481. doi: https://doi.org/10.4491/KSEE.2020.42.10.472
MgCl2 전처리를 이용한 표면개질을 통한 바이오차의 Congo red 흡착성능 향상
오희소 , 장재수
한국해양대학교 환경공학과
Enhancement of the Congo Red Adsorption Capacity of Biochars by Surface Modification with MgCl2 Pretreatment
Hee So Oh , Jae-Soo Chang
Department of Environmental Engineering, Korea Maritime and Ocean University
Corresponding author  Jae-Soo Chang ,Tel: 051-410-4753, Fax: 051-410-4415, Email: jschang@kmou.ac.kr
Received: September 2, 2020;  Revised: September 26, 2020;  Accepted: October 5, 2020.  Published online: October 31, 2020.
ABSTRACT
Objectives
The physicochemical characteristics of Mg-biochar composites derived from kelp and pine after pretreatment with MgCl2 were analyzed, and their adsorption capacities for an anionic dye, Congo red (CR), were evaluated.
Methods
After pretreating 60 g of kelp and pine sawdust in 1 L of 0.1 M MgCl2・6H2O, the raw materials were pyrolyzed at 500℃ to produce Mg-biochar composites (kelp based KB-Mg and pine based PB-Mg). The fundamental physicochemical characteristics of the Mg-biochar composites were examined, and their adsorption capacities for CR were investigated using different initial pH values, adsorption kinetic models, and adsorption isotherm models.
Results
and discussion : The Mg-biochar composites showed the development of uniform deposits of Mg minerals primarily as MgO crystal on the surface by the surface modification with MgCl2. When the pristine biochars were surface-modified with MgCl2, their adsorption capacities for CR were significantly increased over the entire pH range tested. The CR adsorption process by all biochars was best described with the pseudo-first order kinetics model, and the adsorption isotherm characteristics were better described with the Langmuir isotherm model for all biochars. The Langmuir maximum adsorption capacities for KB-Mg and PB-Mg were 423.0 mg/g and 394.7 mg/g, respectively. It is suggested that the main mechanism for CR adsorption on the Mg-biochars is electrostatic attraction between CR and the biochars.
Conclusions
The results showed that surface modification with MgCl2 could greatly enhance the CR adsorption capacity of biochars, and the results demonstrated the great potential of KB-Mg and PB-Mg for CR removal.
Key Words: Biochar, Surface Modification, MgCl2, Congo Red, Adsorption
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