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首页> 外文期刊>Journal of Applied Polymer Science >Removal of ammonium-nitrogen from aqueous solution using chitosan-coated bentonite: Mechanism and effect of operating parameters
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Removal of ammonium-nitrogen from aqueous solution using chitosan-coated bentonite: Mechanism and effect of operating parameters

机译：使用壳聚糖涂覆的膨润土从水溶液中除去氮铵：操作参数的机理和效果

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摘要

Wastewater containing high concentration of ammonium-nitrogen (NH4+-N) is not effectively addressed by biological treatment and when released into water bodies can cause eutrophication. In this study, the removal of NH4+-N from simulated wastewater using chitosan-coated bentonite (CCB) was investigated. The effects of NH4+ salt used, pH, CCB dosage, agitation rate, and temperature on the removal of NH4+-N were studied. The highest NH4+-N removal of 67.5% was attained at the following conditions: initial pH 4.0, CCB dose of 8.0 g, agitation rate of 150 rpm, and temperature of 35 degrees C. Fourier transform infrared analysis indicated two mechanisms: NH4+-N adsorption onto CCB involving hydrogen bonding with hydroxyl groups (-OH) and ion exchange between NH4+-N and cations present in the interlayer of bentonite. Experimental data follows the pseudo-second-order kinetic model (R-2=0.9964) and Koble-Corrigan isotherm (R 250.9705). Thermodynamic studies showed that the adsorption process is spontaneous (Delta G degrees < 0), endothermic (Delta H degrees > 0) in nature, and leads to an increase in randomness at the solid-solution interface (Delta S degrees > 0). (C) 2017 Wiley Periodicals, Inc.
机译：通过生物处理没有有效地解决含有高浓度的氮氮（NH4 + -N）的废水，并且当释放到水体中会导致富营养化。在该研究中，研究了使用壳聚糖涂覆的膨润土（CCB）从模拟废水中除去NH 4 + -N。研究了NH4 +盐的影响，pH，CCB剂量，搅拌速率和温度对NH 4 + -N的去除。在下列条件下实现了最高的NH 4 + -N去除67.5％：初始pH 4.0，CCB剂量为8.0g，搅拌速率为150 rpm，温度为35℃。傅里叶变换红外分析表明两种机制：NH4 + -N在膨润土中与羟基（-OH）和NH4 + -NN和阳离子之间存在的离子交换，吸附涉及氢键合的CCB和在膨润土中的邻孔中的离子交换。实验数据遵循伪二阶动力学模型（R-2 = 0.9964）和Koble-Colrigan等温线（R 250.9705）。热力学研究表明，吸附过程是自发性的（ΔG度<0），本质上吸热（Delta H度> 0），并导致固溶界面的随机性增加（ΔS度值> 0）。 （c）2017 Wiley期刊，Inc。

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