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Synthesis of high-performance sodium carboxymethyl cellulose-based adsorbent for effective removal of methylene blue and Pb (II)

Chen, Yashi, Long, Yuwei, Li, Qing, Chen, Xinhong, Xu, Xi
International journal of biological macromolecules 2019 v.126 pp. 107-117
Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, adsorbents, adsorption, aqueous solutions, carboxymethylcellulose, crosslinking, ion exchange, lead, methyl orange, methylene blue, models, polyacrylamide, polyacrylic acid, sodium, wastewater treatment
In this work, a biobased adsorbent (CMC-PAMA) consisting of sodium carboxymethyl cellulose, polyacrylic acid and polyacrylamide was prepared by a simple thermal crosslinking method for the removal of methylene blue (MB) and Pb (II) from aqueous solutions. The CMC-PAMA showed excellent static adsorption capacities for MB and Pb (II) of 1611.44 mg·g−1 840.11 mg·g−1, respectively, indicating its excellent performance on dyes dynamic removal. The adsorption performance of the as-prepared CMC-PAMA could be fitted well with pseudo-second-order and Langmuir isothermal model. The adsorption mechanism between CMC-PAMA and Pb (II) was confirmed by FT-IR, XPS and ion-exchange behavior. Interestingly, CMC-PAMA showed high efficiency for separation of MB/methyl orange (MO) mixtures, low equilibrium swelling ratio (0.52 g·g−1) in distilled water, good stability and reusability. With those combined advantages, CMC-PAMA could find potential application in wastewater treatment.