Citation: RUAN Chang-Ping, AI Ke-Long, LU Le-Hui. An Acid-resistant Magnetic Co/C Nanocomposite for Adsorption and Separation of Organic Contaminants from Water[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(2): 224-231. doi: 10.11895/j.issn.0253-3820.150537 shu

An Acid-resistant Magnetic Co/C Nanocomposite for Adsorption and Separation of Organic Contaminants from Water

1.
¹ State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
2.
² University of the Chinese Academy of Sciences, Beijing 100039, China

Corresponding author: AI Ke-Long,
Received Date: 6 July 2015
Available Online: 16 July 2015
Fund Project: 本文系国家自然科学基(No. 21125521) (No. 21125521)国家重大科学研究计划项目(973项目, No. 2010CB933600) (973项目, No. 2010CB933600)吉林省青年基金(No. 20130522131JH)项目资助 (No. 20130522131JH)

Magnetic adsorbents have recently been extensively investigated and applied in the field of water purification, because of their magnetic characters which are advantageous for the separation and recycle of these materials. Unfortunately, common magnetic materials are unstable and prone to dissolution in acid environment, thus limiting their practical applications in wide pH range, particularly in acidic condition. Therefore, it is highly imperative to exploit a novel magnetic adsorbent that is acid-resistant, to simplify the separation process during the water purification. In the present work, an acid-resistant magnetic Co/C nanocomposite was synthesized by using ZIF-67 as both template and precursor. The ZIF-67 was carbonized in an argon atmosphere at 800℃ for 1 hour, and then treated with acid. Upon calcination at appropriate temperature in inert atmosphere, the generated Co nanoparticles were uniformly wrapped by graphite layers, due to the graphitization of carbon upon the catalysis effect of Co. The formed graphite layers were able to protect the Co particles from oxidation and acid environment, thus resulting in the generation of an acid-resistant magnetic adsorbent that could be applied in a wide pH range (pH 1-13). Remarkably, the as-synthesized magnetic Co/C nanocomposite demonstrated excellent adsorption performance towards two typical organic dyes (Rhodamine B and malachite green) over a wide pH range. The adsorption isotherms of Rhodamine B and malachite green on Co/C nanocomposite were well fitted with the Langmuir model. Impressively, the maximum adsorption capacities towards Rhodamine B and malachite green were estimated to be 400 mg/g and 561.8 mg/g, respectively, far exceeding many previously reported adsorbents. Moreover, the adsorbent could be easily regenerated by washing with ethylene glycol (EG), suggesting its excellent reusability. Even after 5 cycles of reuse, no obvious capacity degradation was observed. Furthermore, practical application of the magnetic adsorbent was demonstrated by the removal of organic dyes from domestic wastewater with a superior removal efficiency of higher than 97%.
- Magnetic adsorbent,
- Acid resistance,
- Organic contaminants,
- Water purification
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