Key Laboratory of Science and Technology of Eco-Textiles, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.
Shanghai Institute of Quality Inspection and Technical Research, Shanghai 200233, China.
Int J Biol Macromol. 2020 Jun 1;152:1146-1156. doi: 10.1016/j.ijbiomac.2019.10.203. Epub 2019 Nov 18.
Citrate-crosslinked chitosan salt (CSC) microspheres were prepared using chitosan as raw material and citric acid as salifying agent by microwave assisted heating method. The product was characterized by XRD, SEM, NMR, TG, FT-IR, GPC and BET. The citric acid solution concentration, microwave reaction temperature and microwave reaction time showed influence on the morphology and size of chitosan citrate salt microspheres. The prepared chitosan citrate salt microsphere showed a high-efficiency adsorption ability to remove Cr(VI) in water. The best adsorbent CSC-2-1H had an ability to absorb Cr(VI) of 172 mg⋅g and reached adsorption equilibrium at 30 min. The adsorption equilibrium data of CSC-2-1H were analyzed with Langmuir and Freundlich adsorption models. The adsorption kinetics and adsorption thermodynamics of Cr (VI) on CSC-2-1H was also analyzed using the pseudo-first-order model, pseudo-second-order model, van't Hoff equation and Arrhenius equation, respectively.
采用微波辅助加热法，以壳聚糖为原料，柠檬酸为盐化剂，制备了交联壳聚糖盐（CSC）微球。通过 XRD、SEM、NMR、TG、FT-IR、GPC 和 BET 对产物进行了表征。柠檬酸溶液浓度、微波反应温度和微波反应时间对壳聚糖柠檬酸盐微球的形态和粒径有影响。所制备的壳聚糖柠檬酸盐微球对水中的 Cr(VI)具有高效的吸附去除能力。最佳吸附剂 CSC-2-1H 对 Cr(VI)的吸附能力为 172mg⋅g，在 30min 时达到吸附平衡。用 Langmuir 和 Freundlich 吸附模型对 CSC-2-1H 的吸附平衡数据进行了分析。还分别采用准一级动力学模型、准二级动力学模型、范特霍夫方程和阿仑尼乌斯方程对 Cr(VI)在 CSC-2-1H 上的吸附动力学和吸附热力学进行了分析。
