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N-Doped Biochar as a New Metal-Free Activator of Peroxymonosulfate for Singlet Oxygen-Dominated Catalytic Degradation of Acid Orange 7
| Content Provider | MDPI |
|---|---|
| Author | Han, Ruirui Fang, Yingsen Sun, Ping Xie, Kai Zhai, Zhicai Liu, Hongxia Liu, Hui |
| Copyright Year | 2021 |
| Description | In this paper, using rice straw as a raw material and urea as a nitrogen precursor, a composite catalyst (a nitrogen-doped rice straw biochar at the pyrolysis temperature of 800 °C, recorded as NRSBC800) was synthesized by one-step pyrolysis. NRSBC800 was then characterized using XPS, BET, TEM and other technologies, and its catalytic performance as an activator for permonosulfate (PMS) to degrade acid orange 7 (AO7) was studied. The results show that the introduction of N-doping significantly improved the catalytic performance of NRSBC800. The NRSBC800/PMS oxidation system could fully degrade AO7 within 30 min, with the reaction rate constant (2.1 × 10$ ^{−1}$ $min^{−1}$) being 38 times that of RSBC800 (5.5 × $10^{−3}$ $min^{−1}$). Moreover, NRSBC800 not only had better catalytic performance than traditional metal oxides $(Co_{3}O_{4}$ and $Fe_{3}O_{4}$) and carbon nanomaterial (CNT) but also received less impact from environmental water factors (such as anions and humic acids) during the catalytic degradation process. In addition, a quenching test and electron paramagnetic resonance (EPR) research both indicated that AO7 degradation relied mainly on non-free radical oxidation (primarily singlet oxygen (^{1}$O_{2}$)). A recycling experiment further demonstrated NRSBC800’s high stability after recycling three times. |
| Starting Page | 2288 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano11092288 |
| Journal | Nanomaterials |
| Issue Number | 9 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-09-02 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Environmental Engineering Nitrogen-doped Biochar Permonosulfate (pms) Singlet Oxygen Acid Orange 7 |
| Content Type | Text |
| Resource Type | Article |
