香蕉皮的氨氮吸附性能。
Ammonia-nitrogen sorptional properties of banana peels.
机构信息
School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou Jiangxi 341000, PR China.
出版信息
Water Environ Res. 2011 Apr;83(4):368-72. doi: 10.2175/106143010x12851009156042.
Using modified banana peel as a biosorbent to treat water containing ammonia-nitrogen (NH4(+)-N) was studied. Related parameters in the sorptional process, such as chemical modification, pH, and contact time were investigated. The experimental results showed that banana peel modified by 30% sodium hydroxide (NaOH) and mesothermal microwaves (NMBPs) can greatly improve the sorption removal for NH4(+)-N. The kinetics study revealed that the sorption behavior better fit the pseudo-second-order equation than the Lagergren first-order equation. Fourier transform infrared absorption spectrum analysis of banana peels and NMBPs before and after NH4(+)-N sorption revealed that the activity of hydroxyl groups at the surface of the banana peels was strengthened after modification, and nitrogenous groups appeared after biosorpting the NH4(+)-N. In the end, metallurgical wastewater containing a low concentration of NH4(+)-N was treated by NMBPs. The initial NH4(+)-N concentration of 138 mg/L was reduced to 13 mg/L in 25 minutes by 4 g/L NMBPs at pH 10.
采用改性香蕉皮作为生物吸附剂来处理含氨氮（NH4(+)-N）的水。考察了吸附过程中的相关参数，如化学改性、pH 值和接触时间。实验结果表明，用 30%氢氧化钠（NaOH）和中温热微波（NMBPs）改性的香蕉皮可以大大提高对 NH4(+)-N 的吸附去除率。动力学研究表明，吸附行为更符合准二级方程而不是 Lagergren 一级方程。吸附 NH4(+)-N 前后香蕉皮和 NMBPs 的傅里叶变换红外吸收光谱分析表明，改性后香蕉皮表面羟基的活性增强，并且在吸附 NH4(+)-N 后出现了含氮基团。最后，采用 NMBPs 处理含低浓度 NH4(+)-N 的冶金废水。在 pH 值为 10 时，4 g/L 的 NMBPs 在 25 分钟内将初始 NH4(+)-N 浓度从 138 mg/L 降低至 13 mg/L。
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