Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 364, Issue -, Pages 192-205Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.10.024
Keywords
Wastewater treatment; Selective heavy metal ions removal; Microfluidic technology; CS microspheres; Integrated adsorption mechanism analytic system; DFT analysis
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Funding
- National Basic Research Program of China (973 Program) [2014CB748500]
- National Natural Science Foundation of China [51406057, 51578239, 51322805]
- Research Fund for the Doctoral Program of Higher Education of China [20130074120019]
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Many industrial wastewater streams contain heavy metals, posing serious and irreversible damage to humans and living organisms, even at low concentrations due to their high toxicity and persistence in the environment. In this study, high-performance monodispersed chitosan (CS) microspheres were prepared using a simple microfluidic method and evaluated for metal removal from contaminated water. Batch experiments were carried out to evaluate the adsorption characteristics for the removal of copper ions, one representative heavy metal, from aqueous solutions. The inherent advantages of microfluidics enabled a precise control of particle size (CV = 2.3%), while exhibiting outstanding selectivity towards target ions (adsorption capacity 75.52 mg g(-1)) and fair regeneration (re adsorption efficiency 74% after 5 cycles). An integrated adsorption mechanism analytic system was developed based on different adsorption kinetics and isotherms models, providing an excellent adsorption prediction model with pseudo-second order kinetics (R-2 = 0.999), while the isotherm was fitted best to the Langmuir model (R-2 = 0.998). The multi-step adsorption process was revealed via quantitative measurements and schematically described. Selective adsorption performance of CS microspheres in the present of other competitive metal ions with different valence states has been demonstrated and studied by both experimental and density functional theory (DFT) analysis.
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