National Engineering Lab of Textile Fiber Materials & Processing Technology (Zhejiang), Zhejiang Sci-Tech University, Hangzhou, 310018, PR China.
National Engineering Lab of Textile Fiber Materials & Processing Technology (Zhejiang), Zhejiang Sci-Tech University, Hangzhou, 310018, PR China; Zhejiang Provincial Innovation Center of Advanced Textile Technology, Shaoxing, 312000, PR China.
Chemosphere. 2022 Nov;306:135501. doi: 10.1016/j.chemosphere.2022.135501. Epub 2022 Jun 30.
Developing novel bifunctional materials to high efficiently degrade organic pollutants and eliminate hexavalent chromium (Cr (VI)) is significantly desired in the wastewater treatment field. The porous boron nitride (p-BN) was fabricated by a two-stage calcination strategy and was innovatively employed to support zero-valent iron (ZVI), achieving the bifunctional material (p-BN@ZVI) to degrade carbamazepine (CBZ) and eliminate Cr (VI). p-BN@ZVI could degrade more than 98% CBZ in 6 min with the high apparent first-order constant (k) of 0.536 min, almost 5 times higher than that of the ZVI/PMS system and outperformed most previous reported ZVI supported catalysts, which was mainly ascribed to the fact that the introduction of p-BN with high surface area (793.97 m/g) improved the dispersion of ZVI and exposed more active sites. Quenching tests coupled with electron paramagnetic resonance (EPR) suggested that •OH was the major reactive oxygen species with a contribution of 71.6%. Notably, the p-BN@ZVI/PMS system expressed low activation energy of 8.23 kJ/mol and reached a 65.69% TOC degradation in 20 min even at 0 °C. p-BN@ZVI possessed remarkable storage stability and could still degrade 92.3% CBZ despite three-month storage. More interestingly, p-BN@ZVI was capable to eliminate 98.1% of 50 mg/L Cr (VI) within 5 min through adsorption and reduction, where nearly 80% Cr (VI) was transformed to Cr (III), and exhibited the maximum Cr (VI) elimination capacity of 349 mg/g. This study provides new insights into the efficient organic contaminants degradation and Cr (VI) elimination in the treatment of wastewater.
开发新型双功能材料以高效降解有机污染物和去除六价铬（Cr(VI)）在废水处理领域具有重要意义。本文通过两步煅烧策略制备了多孔氮化硼（p-BN），并创新性地将其用于负载零价铁（ZVI），得到了双功能材料（p-BN@ZVI），用于降解卡马西平（CBZ）和去除 Cr(VI)。p-BN@ZVI 可在 6 min 内将 CBZ 降解超过 98%，表观一级反应速率常数（k）高达 0.536 min，几乎是 ZVI/PMS 体系的 5 倍，优于大多数先前报道的 ZVI 负载催化剂，这主要归因于高比表面积（793.97 m/g）的 p-BN 的引入提高了 ZVI 的分散性并暴露出更多的活性位点。淬灭实验结合电子顺磁共振（EPR）表明，•OH 是主要的活性氧物种，贡献了 71.6%。值得注意的是，p-BN@ZVI/PMS 体系在 0°C 下的活化能仅为 8.23 kJ/mol，20 min 内TOC 降解率达到 65.69%。p-BN@ZVI 具有良好的储存稳定性，即使经过三个月的储存，仍能降解 92.3%的 CBZ。更有趣的是，p-BN@ZVI 可在 5 min 内通过吸附和还原去除 50 mg/L 的 98.1%Cr(VI)，其中近 80%的 Cr(VI)被转化为 Cr(III)，并表现出 349 mg/g 的最大 Cr(VI)去除容量。本研究为高效处理废水中的有机污染物降解和 Cr(VI)去除提供了新的思路。
