Honeycomb-like cork activated carbon modified with carbon dots for high-efficient adsorption of Pb(Ⅱ) and rhodamine B

被引：19

作者：

Wang Q. ^{[1
]}

He D. ^{[1
]}

Li C. ^{[1
]}

Sun Z. ^{[1
]}

Mu J. ^{[1
]}

机构：

[1] Key Laboratory of Wood Material Science and Application (Beijing Forestry University), Ministry of Education, Beijing

来源：

Industrial Crops and Products | 2023年 / 196卷

关键词：

Carbon dots; Cork activated carbon; Dyes; Heavy metal ions; Multifunctional adsorbent;

D O I：

10.1016/j.indcrop.2023.116485

中图分类号：

学科分类号：

摘要：

Adsorption is the most promising method for wastewater purification, but it is limited by the low adsorption efficiency and single adsorption performance of the present adsorbents. Herein, a novel multifunctional adsorbent (CAC@CDs-BPEI) for high-efficient adsorption of heavy metal ions and dyes was synthesized using cork activated carbon (CAC) and branched polyethylenimine (BPEI)-modified carbon dots (CDs). CAC is an excellent carrier for CDs-BPEI and can provide strong driving force for the adsorption of contaminants, while CDs-BPEI with numerous amino groups can improve the adsorption capacity and selectivity of the adsorbent for metal ions. The obtained CAC@CDs-BPEI had unique honeycomb structure, ultrathin carbon nanosheet wall layer (∼200 nm), well hierarchical porous structure, high specific surface area (1088.97 m2/g). In addition, it contained abundant amino and oxygen-containing groups. The unique structure and surface chemistry of CAC@CDs-BPEI contributed to its ultra-high adsorption efficiency for Pb(Ⅱ) (231.48 mg/g, 10 min) and RhB (1734.55 mg/g, 180 min). It is worth mentioning that the adsorption capacity of CAC@CDs-BPEI for Pb(Ⅱ) increased by more than 200% compared with that of CAC. Moreover, the resorption efficiency of CAC@CDs-BPEI for Pb(Ⅱ) and RhB can reach approximately 82% and 70%, respectively, after five consecutive adsorption-desorption cycles. The high adsorption efficiency, excellent recyclability, and good stability make the CAC@CDs-BPEI an ideal adsorbent for wastewater treatment. © 2023 Elsevier B.V.

引用

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