Chongqing University, China
Scientific Tracks Abstracts: J Environ Anal Chem
With the significant increase in production and use of heavy metal (especially hexavalent chromium), it will
be inevitably released into aquatic environments, which can result in accumulating throughout the food
chain and having high toxicity to the living organisms. Therefore, developing a kind of low-cost adsorbent with
high adsorption capacity of Cr(VI) from aqueous solution have attracted extensive attention. In this study, novel
adsorbents, poly([2-(methacryloxy)ethyl]trimethylammonium chloride) modified magnetic chitosan particles
(DMCPs), were synthesized under N2 atmosphere via free radical polymerization using [2-(methacryloxy)ethyl]
trimethylammonium chloride (DMC) as grafting monomer and potassium persulfate (KPS) as initiator, and applied
to adsorb Cr(VI) from aqueous solution. The effects of pH (2-11), Cr(VI) concentration (10-200 mg/L) contact time
(0-420 min) on the adsorption performance were evaluated. The results showed that the adsorption capacity of DMCPs
was much larger than that of magnetic chitosan particles (MCPs) in the examined pH range and decreased with Clconcentration
increasing, indicating that electrostatic interaction and ion exchange are the governing mechanisms
of Cr(VI) adsorption by DMCPs. The Langmuir isotherm model and pseudo-second-order kinetic model fitted
the experimental data well, which further demonstrated heterogeneous monolayer adsorption was formed in the
adsorption process and the rate controlling step was chemisorption, respectively. The maximum adsorption capacity
of DMCPs is 153.85 mg/g. Besides, the regeneration and reusability of DMCPs were also explored. Results showed
that more than 80% adsorption capacities of DMCPs for Cr(VI) remained after five adsorption-desorption cycles,
verifying that Cr(VI)-loaded DMCPs could be easily separated and efficiently regenerated. Therefore, DMCPs are
promising candidates for Cr(VI) adsorption owing to their excellent performance in a wide pH range, easy separation
and good reusability.
1. Zheng C, Zheng H, Wang Y (2019) Modified magnetic chitosan microparticles as novel superior adsorbents with huge “force field” for capturing food dyes. Journal of Hazardous Materials 367:492-503
2. Zheng C, Zheng H, Wang Y (2018) Synthesis of novel modified magnetic chitosan particles and their adsorption performance toward Cr(VI). Bioresource Technology 267:1-8.
3. Xu B, Zheng C, Zheng H (2017) Polymer-grafted magnetic microspheres for enhanced removal of methylene blue from aqueous solutions. RSC Advances 74:47029-47037.
Chaofan Zheng, a second year PhD student at Chongqing University, has several years scientific research experience related to both the water purification and preparation of polymer-grafted biological material with the excellent adsorption performance. After several years’ exploration, she has explored a mature method for preparing polymer-grafted magnetic chitosan materials, which is a kind of promising candidates for the removal of heavy metal and dye from wastewater owing to their excellent performance in a wide pH range, easy separation and good reusability.
Journal of Environmental Analytical Chemistry received 1208 citations as per Google Scholar report