Bhatt Rahul, Kushwaha Shilpi, Bojja Sreedhar, Padmaja P
Department of Chemistry, Faculty of Science, M. S. University of Baroda, Sayajigunj, Vadodara 390002, Gujarat, India.
Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India.
ACS Omega. 2018 Oct 15;3(10):13183-13194. doi: 10.1021/acsomega.8b01837. eCollection 2018 Oct 31.
In the present investigation, chitosan (CH) was supramolecularly cross-linked with thiobarbituric acid to form CT. CT was well characterized by UV, scanning electron microscopy-energy-dispersive X-ray analysis, Fourier transform infrared, NMR, differential scanning calorimetry, thermogravimetric analysis, and X-ray diffraction analyses, and its adsorption potential for elemental mercury (Hg), inorganic mercury (Hg), and methyl mercury (CHHg) was investigated. Adsorption experiments were conducted to optimize the parameters for removal of the mercury species under study, and the data were analyzed using Langmuir, Freundlich, and Temkin adsorption isotherm models. CT was found to have high adsorption capacities of 1357.69, 2504.86, and 2475.38 mg/g for Hg, Hg, and CHHg, respectively. The adsorbent CT could be reused up to three cycles by eluting elemental mercury using 0.01 N thiourea, inorganic mercury using 0.01 N perchloric acid, and methyl mercury with 0.2 N NaCl.
在本研究中，壳聚糖（CH）与硫代巴比妥酸进行超分子交联以形成CT。通过紫外可见光谱、扫描电子显微镜-能量色散X射线分析、傅里叶变换红外光谱、核磁共振、差示扫描量热法、热重分析和X射线衍射分析对CT进行了充分表征，并研究了其对元素汞（Hg）、无机汞（Hg）和甲基汞（CHHg）的吸附潜力。进行吸附实验以优化去除所研究汞物种的参数，并使用朗缪尔、弗伦德里希和坦金吸附等温线模型对数据进行分析。结果发现CT对Hg、Hg和CHHg的吸附容量分别高达1357.69、2504.86和2475.38 mg/g。通过用0.01 N硫脲洗脱元素汞、用0.01 N高氯酸洗脱无机汞以及用0.2 N氯化钠洗脱甲基汞，吸附剂CT可重复使用多达三个循环。
