화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.36, No.6, 942-953, June, 2019
DOI10.1007/s11814-019-0267-1  Export Citation
Adsorption of p-chlorophenol and p-nitrophenol in single and binary systems from solution using magnetic activated carbon
Yachan Rong, and Runping Han†
  • College of Chemistry and Molecular Engineering, Zhengzhou University, No 100 of Kexue Road, Zhengzhou, 450001 P. R. China
E-mail:
Magnetic activated carbon (MAC) was prepared by co-precipitation. These particles had attractive adsorption capacity and could be easily separated from aqueous. MAC was used as adsorbent to remove p-chlorophenol (p- CP) and p-nitrophenol (p-NP) from solution in single and binary systems. In a single system, the equilibrium time was 60 min, the best initial pH was 3-8 and 3-6 for p-CP or p-NP adsorption, respectively. The existence of salt ions had little influence on the adsorption process, while surfactant had negative influence. The adsorption quantity from experiments was up to 97.3mg·g-1 for p-CP and 116mg·g-1 for p-NP at 293 K, respectively. Freundlich model and pseudosecond- order kinetic model fitted well the adsorption behavior. Thermodynamic parameters were calculated and the results showed that the process was spontaneous, exothermic and entropy production in nature. In addition, p-CP or p- NP-loaded MAC could be well reused by 0.01 mol·L-1 sodium hydroxide solution as regeneration agent. Kinetic process of desorption was fitted best by pseudo-second-order kinetic model. Results from the binary system showed that competitive adsorption existed during the process, and p-NP adsorption on MAC was easier than p-CP. Freundlich model well fitted the adsorption behavior in the binary system. Hydrogen-bonding, electron donor-acceptor and π-π interactions may be the main mechanisms of adsorption. MAC proved to be an excellent adsorbent for the removal of p-CP and p-NP from solution.
Keywords:Magnetic Activated Carbon;p-Chlorophenol;p-Nitrophenol;Competitive Adsorption;Desorption
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