Kołodyńska Dorota, Ju Yongming, Franus Małgorzata, Franus Wojciech
Department of Inorganic Chemistry, Faculty of Chemistry, Institute of Chemical Sciences, Maria Curie-Skłodowska University, Maria Curie Skłodowska Square 2, 20-031 Lublin, Poland.
Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment (MEE), Nanjing 210042, China.
Materials (Basel). 2021 May 12;14(10):2518. doi: 10.3390/ma14102518.
The possibility of application of chitosan-modified zeolite as sorbent for Cu(II), Zn(II), Mn(II), and Fe(III) ions and their mixtures in the presence of -(1,2-dicarboxyethyl)-D,L-aspartic acid, IDHA) under different experimental conditions were investigated. Chitosan-modified zeolite belongs to the group of biodegradable complexing agents used in fertilizer production. NaP1CS as a carrier forms a barrier to the spontaneous release of the fertilizer into soil. The obtained materials were characterized by Fourier transform infrared spectroscopy (FTIR); surface area determination (ASAP); scanning electron microscopy (SEM-EDS); X-ray fluorescence (XRF); X-ray diffraction (XRD); and carbon, hydrogen, and nitrogen (CHN), as well as thermogravimetric (TGA) methods. The concentrations of Cu(II), Zn(II), Mn(II), and Fe(III) complexes with IDHA varied from 5-20 mg/dm for Cu(II), 10-40 mg/dm for Fe(III), 20-80 mg/dm for Mn(II), and 10-40 mg/dm for Zn(II), respectively; pH value (3-6), time (1-120 min), and temperature (293-333 K) on the sorption efficiency were tested. The Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin adsorption models were applied to describe experimental data. The pH 5 proved to be appropriate for adsorption. The pseudo-second order and Langmuir models were consistent with the experimental data. The thermodynamic parameters indicate that adsorption is spontaneous and endothermic. The highest desorption percentage was achieved using the HCl solution, therefore, proving that method can be used to design slow-release fertilizers.
研究了壳聚糖改性沸石作为吸附剂在不同实验条件下对Cu(II)、Zn(II)、Mn(II)和Fe(III)离子及其混合物的吸附可能性，实验中存在-(1,2-二羧乙基)-D,L-天冬氨酸（IDHA）。壳聚糖改性沸石属于用于肥料生产的可生物降解络合剂。以NaP1CS为载体可形成一道屏障，防止肥料自发释放到土壤中。通过傅里叶变换红外光谱（FTIR）、比表面积测定（ASAP）、扫描电子显微镜（SEM-EDS）、X射线荧光光谱（XRF）、X射线衍射（XRD）以及碳、氢、氮（CHN）分析和热重分析（TGA）等方法对所得材料进行了表征。Cu(II)、Fe(III)、Mn(II)和Zn(II)与IDHA形成的络合物浓度分别为5 - 20 mg/dm³、10 - 40 mg/dm³、20 - 80 mg/dm³和10 - 40 mg/dm³；测试了pH值（3 - 6）、时间（1 - 120分钟）和温度（293 - 333 K）对吸附效率的影响。应用朗缪尔、弗伦德利希、杜比宁-拉杜舍维奇和坦金吸附模型来描述实验数据。结果表明pH为5时适合吸附。准二级动力学模型和朗缪尔模型与实验数据相符。热力学参数表明吸附是自发的且为吸热过程。使用HCl溶液可实现最高的解吸率，因此证明该方法可用于设计缓释肥料。
