研究目的
Investigating the photocatalytic degradation of phenol in synthetic pharmaceutical wastewater using LaFeO3 nanocrystalline synthesized by gel combustion method via citric acid route under visible light irradiation.
研究成果
LaFeO3 nanocrystalline synthesized by gel combustion method exhibited high photocatalytic activity for phenol degradation under visible light, with optimal conditions at pH4, 0.3g catalyst loading, and 50mg/L initial phenol concentration achieving 92% removal. The mechanism involves holes and superoxide radicals as dominant species. This catalyst shows promise for pharmaceutical wastewater treatment.
研究不足
The study is limited to synthetic wastewater and may not fully represent real pharmaceutical wastewater conditions. The scalability of the gel combustion method and long-term stability of the catalyst were not extensively explored. Potential formation of intermediate compounds during degradation could affect efficiency.
1：Experimental Design and Method Selection:
The study employed a gel combustion method for synthesizing LaFeO3 nanocrystalline using citric acid as a sacrificial agent, with characterization via XRD, BET, EDS, and UV-Vis spectroscopy. Photocatalytic degradation experiments were conducted in a customized photo reactor under visible light.
2：Sample Selection and Data Sources:
Synthetic pharmaceutical wastewater containing phenol was used, with variations in pH, catalyst dosage, and initial phenol concentration.
3：List of Experimental Equipment and Materials:
Equipment included XRD (PANalytical XPERT-PRO), BET (BELSORP-max Ver 1.3.0), TEM (JEOL JEM-ARM200F ACCELARM), UV-Vis spectrophotometer (Shimadzu UV3600Plus), and a customized photo reactor with 100 W LED light. Materials included lanthanum(III) nitrate hexahydrate, iron(III) nitrate nonahydrate, citric acid monohydrate, ammonia solution, hydrogen peroxide, hydrochloric acid, sodium hydroxide, phenol, and scavengers like 1-propanol, ammonium oxalate, and p-benzoquinone.
4：0), TEM (JEOL JEM-ARM200F ACCELARM), UV-Vis spectrophotometer (Shimadzu UV3600Plus), and a customized photo reactor with 100 W LED light. Materials included lanthanum(III) nitrate hexahydrate, iron(III) nitrate nonahydrate, citric acid monohydrate, ammonia solution, hydrogen peroxide, hydrochloric acid, sodium hydroxide, phenol, and scavengers like 1-propanol, ammonium oxalate, and p-benzoquinone.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Synthesis involved dissolving metal nitrates in citric acid, adjusting pH to 7, heating to form dry gel, and reacting at 200°C for 24h. Photocatalytic tests involved suspending catalyst in phenol solution with H2O2, stirring in dark for 2h, irradiating with visible light for 4h, sampling every 60min, and analyzing phenol concentration via UV-Vis spectrometry at 270nm.
5：4h. Photocatalytic tests involved suspending catalyst in phenol solution with H2O2, stirring in dark for 2h, irradiating with visible light for 4h, sampling every 60min, and analyzing phenol concentration via UV-Vis spectrometry at 270nm.
Data Analysis Methods:
5. Data Analysis Methods: Phenol removal percentage was calculated using (C0 - Ct)/C0 * 100. Particle size was estimated using Scherrer formula. Band gap was determined using Kubelka-Munk function.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
