التفاصيل البيبلوغرافية
| العنوان: |
Effect of pH on the Catalytic Degradation of Rhodamine B by Synthesized CDs/g‑C 3 N 4 /Cu x O Composites |
| المؤلفون: |
Yulian Guo (7535699), Chunsun Zhou (7535696), Lijuan Fang (2182820), Zhongda Liu (7535693), Wen Li (143214), Miao Yang (328522) |
| سنة النشر: |
2021 |
| المجموعة: |
Smithsonian Institution: Digital Repository |
| مصطلحات موضوعية: |
Medicine, Microbiology, Physiology, Space Science, Environmental Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, water pollution treatment, Rh B, removal ratio, FT-IR, electron, XPS, OH, Rh B degradation, acid, XRD, Fenton, X-ray, recyclability, Rhodamine B, pH, TEM, spectroscopy, H 2 O 2, surface, Cu 2 O, performance, ESR, g-C 3 N 4 |
| الوصف: |
The narrow pH range of Fenton oxidation restricts its applicability in water pollution treatment. In this work, a CDs/g-C 3 N 4 /Cu x O composite was synthesized via a stepwise thermal polymerization method using melamine, citric acid, and Cu 2 O. Adding H 2 O 2 to form a heterogeneous Fenton system can degrade Rhodamine B (Rh B) under dark conditions. The synthesized composite was characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and N 2 adsorption/desorption isotherms. The results showed that CDs, Cu 2 O, and CuO were successfully loaded on the surface of g-C 3 N 4 . By evaluating the catalytic activity on Rh B degradation in the presence of H 2 O 2 , the optimal contents of citric acid and Cu 2 O were 3 and 2.8%, respectively. In contrast to a typical Fenton reaction, which is favored in acidic conditions, the catalytic degradation of Rh B showed a strong pH-dependent relation when the pH is raised from 3 to 11, with the removal from 45 to 96%. Moreover, the recyclability of the composite was evaluated by the removal ratio of Rhodamine B (Rh B) after each cycle. Interestingly, recyclability is also favored in alkaline conditions and shows the best performance at pH 10, with the removal ratio of Rh B kept at 95% even after eight cycles. Through free radical trapping experiments and electron spin resonance (ESR) analysis, the hydroxyl radical ( • OH) and the superoxide radical ( • O 2 – ) were identified as the main reactive species. Overall, a mechanism is proposed, explaining that the higher catalytic performance in the basic solution is due to the dominating surface reaction and favored in alkaline conditions. |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
unknown |
| Relation: |
https://figshare.com/articles/journal_contribution/Effect_of_pH_on_the_Catalytic_Degradation_of_Rhodamine_B_by_Synthesized_CDs_g_C_sub_3_sub_N_sub_4_sub_Cu_i_sub_x_sub_i_O_Composites/14219489 |
| DOI: |
10.1021/acsomega.0c05915.s001 |
| الاتاحة: |
https://doi.org/10.1021/acsomega.0c05915.s001 |
| Rights: |
CC BY-NC 4.0 |
| رقم الانضمام: |
edsbas.E3F3FB14 |
| قاعدة البيانات: |
BASE |