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Facile fabrication of magnetic phosphorylated chitosan for the removal of Co(II) in water treatment: separation properties and adsorption mechanisms

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Abstract

Magnetic phosphorylated chitosan composite (P-MCS), an excellent adsorbent for Co(II), was synthesized in this experiment via a facile fabrication. Its removal efficiency was improved by optimizing pH, contact time, and initial concentration. The adsorption isotherms and kinetic models of Co(II) by P-MCS followed the Langmuir model and the pseudo-second-order model, respectively. However, the rate of adsorption was also affected by intragranular diffusion. The maximum adsorption capacity was 46.1 mg g-1 for Co(II). The results of spectroscopic analysis also indicated that good adsorption performance of Co(II) mainly depends on surface chelation between functional groups and metal ions. The saturation magnetic susceptibilities of P-MCS and P-MCS-Co were 22.29 emu g−1 and 18.18 emu g−1, respectively. The excellent magnetic properties of P-MCS enabled the easy achievement of solid-liquid separation via the use of an external magnetic field. In complex aqueous solutions, K+, Na+, Ca2+, and Mg2+ have less influence on P-MCS adsorption Co(II), but the adsorption capacity on Co(II) is still good. This study shows the feasibility of using P-MCS to treat wastewater containing Co(II).

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Funding

This work is supported by National Water Pollution Control and Management Technology Major Project (2018ZX07110005), the National Natural Science Foundation of China (51578037), the Guangxi Province Technology Major Project (AA17202032), the Scientific Research Program of Beijing Municipal Education Commission (KM201610016001), and the Fundamental Research Funds for Beijing University of Civil Engineering and Architecture (X18288 and X18289)

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Correspondence to Yingying Kou.

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Responsible editor: Tito Roberto Cadaval Jr

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Yuan, D., Zhang, W., Cui, J. et al. Facile fabrication of magnetic phosphorylated chitosan for the removal of Co(II) in water treatment: separation properties and adsorption mechanisms. Environ Sci Pollut Res 27, 2588–2598 (2020). https://doi.org/10.1007/s11356-019-07026-5

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  • DOI: https://doi.org/10.1007/s11356-019-07026-5

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