| A liquid phase deposited porous flower-like HNaV6O16·4H2O film developed for a novel adsorbent to remove Pb2+, Cu2+, Mn2+ and Cd2+ |
| Hai Yan Xu1,2, Yi Cai Yang1, Dong Cai Li1, Ran Ran Wu1, Ai Guo Wang1, Dao Sheng Sun1, Feng Jun Zhang2, Won-Chun Oh3 |
1Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, People’s Republic of China
2Key Laboratory of Functional Molecule Design and Interface Process, Anhui Jianzhu University, Hefei 230601, People’s Republic of China
3Department of Advanced Materials Science and Engineering, Hanseo University, Seosan 31962, South Korea |
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Received: March 17, 2022; Revised: June 6, 2022 Accepted: June 19, 2022. Published online: July 18, 2022. |
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| ABSTRACT |
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Heavy metal ion pollution of water resources is becoming increasingly serious, and adsorption is one of the most effective strategies for removing heavy metal ions. In the paper, hydrated hydrogen sodium vanadium oxide (HNaV6O16·4H2O) film developed for heavy metal ion adsorption was prepared directly via a low-temperature liquid-phase deposition approach. The prepared film shows an interesting porous flower-like morphology and has large spacing (d = 10.87 Å). The highest adsorption capacity of the obtained HNaV6O16ᜃ4H2O film for Pb2+, Cu2+, Cd2+ and Mn2+ is 513 mg/g (2565 mg/m2), 430 mg/g (2150 mg/m2), 134 mg/g (875 mg/m2) and 175 mg/g (670 mg/m2), respectively. The adsorption percentage of the sample decreased from 92.2 to 86.3% after 4 cycles. The adsorption process follows the Langmuir adsorption isotherm and the pseudo second-order dynamic model, indicating that heavy metal ion adsorption by the film is a single molecular layer chemical adsorption. In combination with various characterizations and comparison tests of samples after adsorption, the adsorption mechanisms include surface electrostatic attraction, complexation, and cation exchange. The results indicate that the film is a potential material to remove heavy metal ions from the aqueous solution. |
| Key words:
HNaV6O16·4H2O film · Large layer spacing · Film adsorbent · Adsorption model |
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