Carboxymethyl Inulin Modified Chitosan Composites for Cu (II) Removal in Aqueous Solution: Synthesis, Influencing Factors and Adsorption Mechanism

IF 4.7 3区 工程技术 Q2 ENGINEERING, ENVIRONMENTAL
Mengyao Li, Hongying Hao, Huiqiang Zeng, Manyi Yin, Yinfeng Xia, Kun Du, Ziqiang Shao
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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.

Graphical Abstract

Abstract Image

Abstract Image

用于去除水溶液中铜 (II) 的羧甲基菊粉改性壳聚糖复合材料:合成、影响因素和吸附机理
通过优化碱化-醚化三步法制备了具有特定取代度(DS)的羧甲基菊粉(CMI),然后用 DMTMM 与壳聚糖适度交联,设计并合成了一种新的生物质基羧甲基菊粉改性壳聚糖材料,用于去除水溶液中的铜(II)。利用傅立叶变换红外光谱(FTIR)、X 射线光电子能谱(XPS)、扫描电子显微镜(SEM)、布吕纳-埃米特-泰勒(BET)和热重分析(TGA)对 CMI-CS 的结构和形态进行了表征。研究了 CMI 的用量、吸附时间、吸附温度、pH 值和初始铜(II)浓度对 CMI-CS 吸附铜(II)能力的影响。在 CMI 和 CS 质量比为 3:2、pH 值为 6、吸附时间为 90 分钟的条件下,吸附剂对 Cu (II) 的吸附容量为 49.4 mg/g。其吸附动力学符合伪二阶模型,吸附等温线符合 Freundlich 和 Temkin 模型。研究人员利用 XPS、傅立叶变换红外光谱和扫描电子显微镜探索了吸附机理。结果表明,吸附过程中化学吸附和物理吸附并存。CMI-CS 吸附剂中的含氮基团和含氧官能团通过静电作用和螯合作用参与了铜(II)的吸附。基于上述特性,该生物质吸附剂在废水处理中具有广阔的应用前景。
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来源期刊
Journal of Polymers and the Environment
Journal of Polymers and the Environment 工程技术-高分子科学
CiteScore
9.50
自引率
7.50%
发文量
297
审稿时长
9 months
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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