Ruidas Santu, Chowdhury Avik, Ghosh Anirban, Ghosh Avik, Mondal Sujan, Wonanke A D Dinga, Addicoat Matthew, Das Abhijit Kumar, Modak Arindam, Bhaumik Asim
School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
School of Mathematical & Computational Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
Langmuir. 2023 Mar 21;39(11):4071-4081. doi: 10.1021/acs.langmuir.2c03379. Epub 2023 Mar 11.
Exploring a covalent organic framework (COF) material as an efficient metal-free photocatalyst and as an adsorbent for the removal of pollutants from contaminated water is very challenging in the context of sustainable chemistry. Herein, we report a new porous crystalline COF, C-TRZ-TPA COF, via segregation of donor-acceptor moieties through the extended Schiff base condensation between tris(4-formylphenyl)amine and 4,4',4″-(1,3,5-triazine-2,4,6-triyl)trianiline. This COF displayed a Brunauer-Emmett-Teller (BET) surface area of 1058 m g with a pore volume of 0.73 cc g. Again, extended π-conjugation, the presence of heteroatoms throughout the framework, and a narrow band gap of 2.2 eV, all these features collectively work for the environmental remediation in two different perspectives: it could harness solar energy for environmental clean-up, where the COF has been explored as a robust metal-free photocatalyst for wastewater treatment and as an adsorbent for iodine capture. In our endeavor of wastewater treatment, we have conducted the photodegradation of rose bengal (RB) and methylene blue (MB) as model pollutants since these are extremely toxic, are health hazard, and bioaccumulative in nature. The catalyst C-TRZ-TPA COF showed a very high catalytic efficiency of 99% towards the degradation of 250 parts per million (ppm) of RB solution in 80 min under visible light irradiation with the rate constant of 0.05 min. Further, C-TRZ-TPA COF is found to be an excellent adsorbent as it efficiently adsorbed radioactive iodine from its solution as well as from the vapor phase. The material exhibits a very rapid iodine capturing tendency with an outstanding iodine vapor uptake capacity of 4832 mg g.
在可持续化学的背景下，探索一种共价有机框架（COF）材料作为高效的无金属光催化剂以及用于去除污水中污染物的吸附剂极具挑战性。在此，我们通过三（4-甲酰基苯基）胺与4,4',4″-（1,3,5-三嗪-2,4,6-三基）三苯胺之间的扩展席夫碱缩合，通过供体-受体部分的分离，报道了一种新型多孔晶体COF，即C-TRZ-TPA COF。这种COF的布鲁诺尔-埃米特-特勒（BET）表面积为1058 m²/g，孔体积为0.73 cc/g。此外，扩展的π共轭、整个框架中杂原子的存在以及2.2 eV的窄带隙，所有这些特征共同从两个不同角度助力环境修复：它可以利用太阳能进行环境清理，其中COF已被探索作为用于废水处理的强大无金属光催化剂以及用于碘捕获的吸附剂。在我们的废水处理工作中，我们以孟加拉玫瑰红（RB）和亚甲基蓝（MB）作为模型污染物进行了光降解，因为它们具有极高的毒性、对健康有害且具有生物累积性。催化剂C-TRZ-TPA COF在可见光照射下80分钟内对250 ppm的RB溶液降解显示出99%的极高催化效率，速率常数为0.05 min⁻¹。此外，发现C-TRZ-TPA COF是一种出色的吸附剂，因为它能有效地从其溶液以及气相中吸附放射性碘。该材料表现出非常快速的碘捕获趋势，碘蒸汽吸收容量高达4832 mg/g。
