A dual-strategy for the valorization and regeneration of spent activated carbon

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2024-11-23 DOI:10.1016/j.diamond.2024.111800

Wenjing Liu , Zihang Qiao , Bin Wang , Zheyu Li , Minghui Zhang

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Abstract

To accomplish the objective of reusing spent activated carbon (AC), this study achieved the in-situ regeneration of spent AC through a chemical oxidation process that produced carbon quantum dots (CQDs). The primary focus was to investigate the physical and chemical structural transformations occurring during the conversion of AC into CQDs, elucidating the in-situ regeneration mechanism of the spent AC. The ultimate aim was to develop a durable, efficient, and cost-effective activated carbon adsorbent. The findings indicate that the in-situ regenerated AC recovered 68 % of its original adsorption capacity during CQDs (with a quantum yield of 8 %) preparation process. Notably, the regenerated AC displayed a distinctive hierarchical petal-like structure and an increase in surface oxygenated functional groups, which shifted its adsorption mechanism from predominantly physical to chemical adsorption. Furthermore, the incorporation of the TiO₂ modifier reduced the band gap of the AC/CQDs to 2.13 eV, thus broadening the composite system's response spectrum under visible light and decreasing the recombination of photogenerated electron-hole pairs. Consequently, the in-situ regeneration of spent AC was enhanced and superior to that reported in existing literature.

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废活性炭的价值化和再生双重战略

为了实现废活性炭（AC）再利用的目标，本研究通过化学氧化过程实现了废活性炭的原位再生，并产生了碳量子点（CQDs）。研究的主要重点是调查活性炭转化为碳量子点过程中发生的物理和化学结构转变，阐明废活性炭的原位再生机制。最终目的是开发一种耐用、高效、经济的活性炭吸附剂。研究结果表明，在制备 CQDs（量子产率为 8%）的过程中，原位再生的 AC 恢复了 68% 的原始吸附能力。值得注意的是，再生 AC 显示出独特的分层花瓣状结构和表面含氧官能团的增加，使其吸附机制从物理吸附为主转变为化学吸附为主。此外，TiO2 改性剂的加入使 AC/CQDs 的带隙减小到 2.13 eV，从而拓宽了复合系统在可见光下的响应光谱，减少了光生电子-空穴对的重组。因此，废 AC 的原位再生能力得到了增强，优于现有文献报道的再生能力。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.