| TiO2/生物炭复合材料处理低浓度氨氮废水 |
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| 引用本文： | 张梦媚,何世颖,唐婉莹,冯彦房,杨林章.TiO2/生物炭复合材料处理低浓度氨氮废水[J].环境科学研究,2017,30(9):1440-1447. |
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| 作者姓名： | 张梦媚 何世颖 唐婉莹 冯彦房 杨林章 |
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| 作者单位： | 1.江苏省农业科学院农业资源与环境研究所, 江苏 南京 210014 |
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| 基金项目： | 江苏省农业科技自主创新资金项目〔CX(14)2050〕；国家自然科学基金项目(41301267,41401345) |
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| 摘 要： | 为研究功能复合材料对低浓度氨氮〔ρ(NH4+-N)≤50 mg/L〕废水的处理效果，采用水热法制备TiO2/生物炭复合材料，并在自制光催化反应装置中对低浓度氨氮废水进行处理，考察TiO2负载量、温度、pH等因素对NH4+-N去除过程的影响以及催化的最终降解产物.结果表明，TiO2/生物炭复合材料能有效催化去除废水中的NH4+-N，其优化处理条件:ρ(NH4+-N)为50 mg/L，TiO2/生物炭复合材料投加量为1.5 g/L，254 nm紫外灯照射120 min，TiO2负载量为20%，废水初始pH为11.0，曝气量为150 mL/min.在优化处理条件下，当温度为60 ℃时NH4+-N去除率可达100%，常温(30 ℃)下可达67%.反应最终产物中ρ(NO2--N)非常低，并且无NO3--N生成.研究显示，TiO2/生物炭复合材料具有将NH4+-N转化为N2的良好光催化氧化选择性.
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| 关 键 词： | TiO2 生物炭 低浓度氨氮废水 |
| 收稿时间： | 2016/6/22 0:00:00 |
| 修稿时间： | 2017/5/19 0:00:00 |
Disposal of Low Concentration Ammonia-Nitrogen Wastewater Using TiO2/Biochar Composite |
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| ZHANG Mengmei,HE Shiying,TANG Wanying,FENG Yanfang and YANG Linzhang.Disposal of Low Concentration Ammonia-Nitrogen Wastewater Using TiO2/Biochar Composite[J].Research of Environmental Sciences,2017,30(9):1440-1447. |
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| Authors: | ZHANG Mengmei HE Shiying TANG Wanying FENG Yanfang and YANG Linzhang |
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| Affiliation: | 1.Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China2.School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China |
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| Abstract: | In order to investigate the disposal of low concentration ammonia-nitrogen wastewater (concentration less than or equal to 50 mg/L) using a functional composite, a new photocatalyst, TiO2/biochar composite, was prepared by immobilizing TiO2 nanoparticles onto biochar synthesized by the hydrothermal method. The properties of the as-prepared TiO2/biochar were further characterized by X-ray diffraction, scanning electron microscopy, and UV-Vis diffuse reflectance spectroscopy. The photocatalytic degradation of ammonia-nitrogen from water was evaluated along the gradients of load ratio, pH, temperature and initial concentrations of ammonia-nitrogen. The results showed that TiO2 nanoparticles were well dispersed on the biochar, which prevented the agglomeration of TiO2 and enhanced the instability. The highest ammonia-nitrogen removal efficiency (100% at 60 ℃ and over 70% at 30 ℃)was observed at the conditions of 20% TiO2 loading, 150 mL/min aeration rate, pH 11.0, and under 254 nm UV light irradiation. The final product contained little nitrite and exclusive nitrate, indicating the excellent catalytic selectivity of TiO2/biochar composite, which can oxide ammonia-nitrogen to N2. In conclusion, TiO2/biochar composite is anenvironmentally-friendly and highly efficient photocatalyst complex for the removal of ammonia-nitrogen at low concentrations. |
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| Keywords: | TiO2 biochar low concentration of ammonia-nitrogen wastewater |
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