期刊
NANOMATERIALS
卷 12, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/nano12010160
关键词
carboxymethylation; cellulose nanofibrils; aerogel; adsorption
类别
资金
- National Key R&D Program of China [2017YFB0307900]
- Foundation [ZZ20200107]
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Natural Science Foundation of Shandong Province, China [ZR2021QC158]
Carboxymethyl cellulose nanofibrils (CMCNFs) with different carboxyl content were prepared and used to prepare CMCFs-PEI aerogels. The adsorption capacity of CMCFs-PEI aerogels for Cu2+ was found to be efficient, suggesting their potential application in wastewater treatment.
In the present study, carboxymethyl cellulose nanofibrils (CMCNFs) with different carboxyl content (0.99-2.01 mmol/g) were prepared via controlling the ratio of monochloroacetic acid (MCA) and sodium hydroxide to Eucalyptus bleached pulp (EBP). CMCFs-PEI aerogels were obtained using the crosslinking reaction of polyethyleneimine (PEI) and CMCNFs with the aid of glutaraldehyde (GA). The effects of pH, contact time, temperature, and initial Cu2+ concentration on the Cu2+ removal performance of CMCNFs-PEI aerogels was highlighted. Experimental data showed that the maximum adsorption capacity of CMCNF30-PEI for Cu2+ was 380.03 +/- 23 mg/g, and the adsorption results were consistent with Langmuir isotherm (R-2 > 0.99). The theoretical maximum adsorption capacity was 616.48 mg/g. After being treated with 0.05 M EDTA solution, the aerogel retained an 85% removal performance after three adsorption-desorption cycles. X-ray photoelectron spectroscopy (XPS) results demonstrated that complexation was the main Cu2+ adsorption mechanism. The excellent Cu2+ adsorption capacity of CMCNFs-PEI aerogels provided another avenue for the utilization of cellulose nanofibrils in the wastewater treatment field.
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