Cr(VI) and Pb(II) capture on pH-responsive polyethyleneimine and chloroacetic acid functionalized chitosan microspheres
| Autor: | Qifeng Dang, Guozhu Chang, Chengsheng Liu, Dongsu Cha, Wenjing Zhu, Dejun Yu, Bonian Zhang, Hantian Sun, Xiaoying Pu, Qiongqiong Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Polymers and Plastics
Conductometry Chemistry Organic Chemistry Chloroacetic acid 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Adsorption X-ray photoelectron spectroscopy Specific surface area Monolayer Materials Chemistry medicine Fourier transform infrared spectroscopy Swelling medicine.symptom 0210 nano-technology Nuclear chemistry |
| Zdroj: | Carbohydrate polymers. 219 |
| ISSN: | 1879-1344 |
| Popis: | PEI-ECH-CMCS microspheres (MPs) were first constructed via elaborately programmed procedures. Fourier transform infrared spectroscopy, conductometric titration, Brunauer−Emmett−Teller, X-ray diffraction, pH at zero point of charge (pHzpc), scanning electron microscopy, X-ray photoelectron spectroscopy, and swelling results demonstrated that chitosan-based adsorbent had ample −NH2 and −COOH, specific surface area of 29.040 m2/g, porous 3D architectures, pHzpc of 4.2, uniform spherical surfaces, narrow size distribution (19–33 μm), and pH-responsive swelling features, advantageous to Cr(VI) and Pb(II) capture. Adsorption parameters were obtained from batch experiments and pH 3 and 5 were chosen for Cr(VI) and Pb(II) capture. Pseudo-second-order kinetic and Liu isotherm models well interpreted adsorption behavior, and thermodynamic, isotherm, and kinetic studies revealed an exothermic, spontaneous, monolayer, and chemical adsorption process. Maximum adsorption capacity for Cr(VI) or Pb(II) was 331.32 or 302.56 mg/g, exceeding CS-based adsorbents reported. Excellent reusability and feasibility were evidenced by adsorption capacity loss |
| Databáze: | OpenAIRE |
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