Molten NaCl-induced MOF-derived carbon-polyhedron decorated carbon-nanosheet with high defects and high N-doping for boosting the removal of carbamazepine from water,Environmental Science: Nano

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Molten NaCl-induced MOF-derived carbon-polyhedron decorated carbon-nanosheet with high defects and high N-doping for boosting the removal of carbamazepine from water
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-02-26 , DOI: 10.1039/c9en01408j
Dezhi Chen _{1,

2,

3,

4,

5} , Shoujun Wang _{1,

2,

3,

4,

5} , Zhiming Zhang _{1,

2,

3,

4,

5} , Hongying Quan _{1,

2,

3,

4,

5} , Yachao Wang _{1,

2,

3,

4,

5} , Yijie Jiang _{1,

2,

3,

4,

5} , Matthew J. Hurlock _{6,

7,

8,

9} , Qiang Zhang _{6,

7,

8,

9}

Affiliation

The efficient removal of endocrine-disrupting pollutants (EDCs) from water is a crucial issue for improving the quality of drinking water. Herein, hierarchically structured carbon composites (HCCs) composed of carbon-polyhedron decorated carbon nanosheets were fabricated using the zeolite imidazole framework-8 (ZIF-8) as the precursor in the presence of molten NaCl. The as-prepared hierarchical carbon composites showed higher specific surface areas, more defects, high N-doping, and hydrophilicity compared with the NaCl-free ZIF-8-derived carbon polyhedrons (CPs). In addition, the as-prepared HCCs exhibited boosted adsorption performances for the removal of the model EDC, namely carbamazepine (CBZ), surpassing CPs and commercial powdered activated carbon (AC). The adsorption kinetics showed that HCCs possessed a higher sorption rate as compared to CPs and AC. In the initial 5 min, the adsorption amount of CBZ on HCCs reached 94.9% of the adsorption quantity at equilibrium. Furthermore, the maximum adsorption capacity of CBZ on HCCs is 248.7 mg g⁻¹, which is superior to that of CPs and AC. X-ray photoelectron spectroscopy characterizations indicated that the predominant factors for controlling the adsorption of CBZ on HCCs are π–π electron donor–acceptor interactions and hydrogen bonding, although, some of the adsorbed CBZ molecules were decomposed by oxidation. Finally, a fixed-bed experiment demonstrated that the HCCs have great potential as a filler for the purification of tap water.

中文翻译：

熔融NaCl诱导的MOF衍生的碳多面体装饰的碳纳米片具有高缺陷和高N掺杂，可促进从水中去除卡马西平

从水中有效去除内分泌干扰物（EDC）是提高饮用水质量的关键问题。在此，在熔融的NaCl存在下，使用沸石咪唑骨架8（ZIF-8）作为前体，制备了由碳多面体装饰的碳纳米片组成的分层结构的碳复合物（HCC）。与不含NaCl的ZIF-8衍生的碳多面体（CP）相比，所制备的分层碳复合材料显示出更高的比表面积，更多的缺陷，更高的N掺杂和亲水性。此外，所制备的HCC在去除模型EDC（即卡马西平（CBZ）），超过CP和商业粉状活性炭（AC）方面显示出更高的吸附性能。吸附动力学表明，与CP和AC相比，HCC具有更高的吸附速率。在开始的5分钟内，CBZ在HCC上的吸附量达到平衡时吸附量的94.9％。此外，CBZ在HCC上的最大吸附容量为248.7 mg g^-1，优于CP和AC。X射线光电子能谱表征表明，控制CBZ在HCC上吸附的主要因素是π-π电子供体-受体相互作用和氢键，尽管某些吸附的CBZ分子会被氧化分解。最后，固定床实验表明，HCC具有作为自来水净化填料的巨大潜力。

更新日期：2020-02-26

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