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| Study on Preparation of Sodium Carboxymethyl Cellulose/Adipic Dihydrazide Hydrogel and Its Adsorption Performance for Heavy Metal Ions |
| Received:December 28, 2020 |
| DOI：10.11981/j.issn.1000-6842.2021.04.38 |
| Key Words:sodium carboxymethyl cellulose （CMC）;adipic dihydrazide （ADH）;hydrogel;heavy metal ions;wastewater |
| Author Name | Affiliation | Postcode | | YUAN Qi | School of Chemistry and Food Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | WANG Yulong | School of Chemistry and Food Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | HAN Junyuan | School of Chemistry and Food Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | WEI Xinxin | School of Chemistry and Food Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | DAI Yang | School of Chemistry and Food Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | LIU Yanxin | School of Chemistry and Food Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 |
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| Abstract: |
| The sodium carboxymethyl cellulose/adipic dihydrazide （CMC/ADH） hydrogel with three-dimensional network structure was successfully prepared by using CMC as the substrate and ADH as the cross-linking agent. The adsorption performance of the CMC/ADH hydrogel on heavy metal ions （Cr6+， Cu2+， and Pb2+） in wastewater was studied. The as-prepared hydrogel was characterized through Fourier transform infrared spectroscopy （FT-IR）， scanning electron microscope （SEM）， X-ray energy spectrum analysis （EDS）， and swelling performance analysis. The effects of adsorption time， pH value， and initial concentration of heavy metal ion on the adsorption process of CMC/ADH hydrogel in simulated wastewater， and the mechanism of which were studied. The results showed that the adsorption capacities of CMC/ADH hydrogel for Cr6+， Cu2+， and Pb2+ were 31.5， 75.9， and 72.0 mg/g， respectively， at room temperature （25℃）， pH value of 3， initial concentration of heavy metal ion of 50 mg/L， and adsorption time of 300 min. The kinetic model and isothermal model fitting results of the adsorption process showed that adsorption of CMC/ADH hydrogel on heavy metal ions was a monolayer chemical process. |
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