Billah Rachid El Kaim, Azoubi Zineb, López-Maldonado Eduardo Alberto, Majdoubi Hicham, Lgaz Hassane, Lima Eder C, Shekhawat Anita, Tamraoui Youssef, Agunaou Mahfoud, Soufiane Abdessadik, Jugade Ravin
Department of Chemistry, Faculty of Sciences, Laboratory of Coordination and Analytical Chemistry, University of Chouaib Doukkali, El Jadida 24000, Morocco.
Laboratory of Physiopathology and Molecular Genetics, Faculty of Sciences Ben M'Sick, Hassan II University of Casablanca, Casablanca 20450, Morocco.
ACS Omega. 2023 Mar 8;8(11):10051-10061. doi: 10.1021/acsomega.2c07391. eCollection 2023 Mar 21.
This work synthesized a novel chitosan-loaded MgAl-LDH (LDH = layered double hyroxide) nanocomposite, which was physicochemically characterized, and its performance in As(V) removal and antimicrobial activity was evaluated. Chitosan-loaded MgAl-LDH nanocomposite (CsC@MgAl-LDH) was prepared using cross-linked natural chitosan from shrimp waste and modified by Mg-Al. The main mechanisms predominating the separation of As(V) were elucidated. The characteristic changes confirming MgAl-LDH modification with chitosan were analyzed through Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis-differential thermal analysis, and Brunauer-Emmett-Teller measurements. Porosity and the increased surface area play an important role in arsenic adsorption and microbial activity. Adsorption kinetics follows the general order statistically confirmed by Bayesian Information Criterion differences. To understand the adsorption process, Langmuir, Freundlich, and Liu isotherms were studied at three different temperatures. It was found that Liu's isotherm model was the best-fitted model. CsC@MgAl-LDH showed the maximum adsorption capacity of 69.29 mg g toward arsenic at 60 °C. It was observed that the adsorption capacity of the material rose with the increase in temperature. The spontaneous behavior and endothermic nature of adsorption was confirmed by the thermodynamic parameters study. Minimal change in percentage removal was observed with coexisting ions. The regeneration of material and adsorption-desorption cycles revealed that the adsorbent is economically efficient. The nanocomposite was very effective against and .
本研究合成了一种新型的负载壳聚糖的MgAl层状双氢氧化物（LDH）纳米复合材料，对其进行了物理化学表征，并评估了其去除As(V)的性能和抗菌活性。采用虾壳废弃物中的交联天然壳聚糖制备了负载壳聚糖的MgAl-LDH纳米复合材料（CsC@MgAl-LDH），并进行了Mg-Al改性。阐明了As(V)分离的主要机制。通过傅里叶变换红外光谱、X射线衍射、热重分析-差示热分析和布鲁诺尔-埃米特-泰勒测量，分析了壳聚糖改性MgAl-LDH的特征变化。孔隙率和增加的表面积在砷吸附和微生物活性中起重要作用。吸附动力学遵循由贝叶斯信息准则差异统计确认的一般顺序。为了解吸附过程，在三个不同温度下研究了朗缪尔、弗伦德里希和刘等温线。发现刘等温线模型是最佳拟合模型。CsC@MgAl-LDH在60℃时对砷的最大吸附容量为69.29mg/g。观察到材料的吸附容量随温度升高而增加。热力学参数研究证实了吸附的自发行为和吸热性质。共存离子对去除率的影响最小。材料的再生和吸附-解吸循环表明该吸附剂具有经济高效性。该纳米复合材料对……和……非常有效。
