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Sandwich-like, potassium(I) doped g-C3N4 with tunable interlayer distance as a high selective extractant for the determination of Ba(II)
- Kang, Jing-Yan, Ha, Wei, Zhang, Hai-Xia, Shi, Yan-Ping
- Talanta 2020 v.215 pp. 120916
- barium, carbon nitride, graphene, marine fish, melamine, potassium, potassium hydroxide, Yellow River
- Element doping is considered as an effective strategy to adjust the interlayer distance of graphitic carbon nitride (g-C₃N₄) and the element doped g-C₃N₄ can be applied in metal extraction. Here, a series of potassium(I) doped graphitic carbon nitride (g–C₃N₄–K) materials with modulated interlayer distance ranging from 3.257 Å to 3.198 Å were successfully synthesized by calcining the different doped ratios mixture of melamine and KOH. Interestingly, g–C₃N₄–K (Q₍ₘₑₗₐₘᵢₙₑ₎:Q₍KOH₎ = 7:1) composite achieves the optimal properties and displays excellent extraction capacity and selectivity for barium [Ba(II)]. It is attributed to the correlation between K dopants and interlayer distance of g–C₃N₄–K, which highlighted the effect of doped K on the decreasing interlayer. Furthermore, an original extraction method coupled with ICP-OES based on g–C₃N₄–K was established for Ba(II) and successfully applied in detection of trace Ba(II) in water sample from Yellow River and sample of sea fish.