Mengyao Li, Hongying Hao, Huiqiang Zeng, Manyi Yin, Yinfeng Xia, Kun Du, Ziqiang Shao
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引用次数: 0
Abstract
A new biomass-based carboxymethyl inulin modified chitosan material was designed and synthesized as an adsorbent for the Cu (II) removal from aqueous solutions, in which carboxymethyl inulin (CMI) with specific degree of substitution (DS) was prepared by optimal three steps alkalization-etherification processes, and then moderately crosslinked with chitosan by DMTMM. The structure and morphology of CMI-CS were characterized using fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), brunauer–emmett–teller (BET) and thermogravimetric analysis (TGA) analyses. The effects of CMI dosage, adsorption time, adsorption temperature, pH and initial Cu (II) concentration on the adsorption capability of CMI-CS to Cu (II) were investigated. The adsorption capacity of the adsorbent for Cu (II) was 49.4 mg/g under the conditions of CMI and CS mass ratio 3:2, pH 6, and adsorption time for 90 min. Its adsorption kinetics fitted the pseudo-second-order model, and adsorption isotherms followed by the Freundlich and the Temkin models well. XPS, FTIR, and SEM were used to explore the adsorption mechanism. The results demonstrated chemisorption and physisorption coexist in the adsorption process. The nitrogen-containing groups and oxygen-containing functional groups of CMI-CS adsorbent participated in the adsorption of Cu (II) through electrostatic interaction and chelation. Based on the above traits, the biomass-based adsorbent shows promising application in wastewater treatment.
期刊介绍：
The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.
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