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Optimum synthesis of an amino functionalized microcrystalline cellulose from corn stalk for removal of aqueous Cu2+

Author:
Wu, Yumeng, Jiang, Yihua, Li, Yuejun, Wang, Rong
Source:
Cellulose 2019 v.26 no.2 pp. 805-821
ISSN:
0969-0239
Subject:
Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, adsorbents, adsorption, cellulose, copper, corn stover, emulsifiers, metal ions, moieties, pH, pollution control, potassium persulfate, scanning electron microscopes, secondary amines, sorption isotherms, thermogravimetry, toxicity, wastewater, water pollution
Abstract:
An amino functionalized microcrystalline cellulose from corn stalk was prepared and its synthesis and operation conditions were optimized to remove Cu²⁺ from wastewater. To prepare this adsorbent, cellulose was grafted by glycidyl methacrylate in the presence of OP-10 as emulsifiers and potassium persulfate as initiators, then the grafted cellulose was aminated by diethylenetriamine. Batch experiments were performed to evaluate its adsorption capacity for Cu²⁺. Its adsorption process for Cu²⁺ was spontaneous and well fitted with pseudo-second-order kinetics and Langmuir isotherm. The maximum adsorption capacity of this modified cellulose for Cu²⁺ was demonstrated to be 343 mg/g at 45 °C and pH 4.5. The adsorbent showed a promising future due to its high performance in the removal of toxic Cu²⁺ and reusability. From the characterization results of scanning electron microscope, X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, the adsorbent structure and adsorption mechanism could be inferred. The adsorption mechanism revealed that the primary and secondary amines were the main functional groups to adsorb Cu²⁺. The study results could provide a new route for the utilization of waste corn stalk to control water pollution caused by toxic metal ions.
Agid:
6314451