Advanced Materials and Process Engineering Laboratory, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia.
Department of Chemical Engineering, School of Science and Engineering, Manipal International University (MIU), 71800, Nilai, Negeri Sembilan, Malaysia.
Environ Sci Pollut Res Int. 2020 Jun;27(16):20173-20186. doi: 10.1007/s11356-019-06507-x. Epub 2020 Apr 1.
The utilization of natural zeolite (NZ) as an adsorbent for NH removal was investigated. Three types of NZ (i.e., NZ01, NZ02, and NZ03) were characterized, and their NH adsorption process in aqueous solution was evaluated. The effect of pH towards NH adsorption showed that the NZ01 has the highest NH adsorption capacity compared with other natural zeolites used. The application of NZ01 for a simultaneous removal of NH and turbidity in synthetic NH-kaolin suspension by adsorptive coagulation process for treating drinking water was studied. The addition of NZ01 into the system increased the NH removal efficiency (η) from 11.64% without NZ01 to 41.86% with the addition of 0.2 g L of NZ01. The turbidity removal (η), however, was insignificantly affected since the η was already higher than 98.0% over all studied parameter's ranges. The thermodynamic and kinetic data analyses suggested that the removal of NH4 obeyed the Temkin isotherm model and pseudo-second-order kinetic model, respectively. Generally, the turbidity removal was due to the flocculation of destabilized solid particles by alum in the suspension system. The η in surface water was 29.31%, which is lower compared with the removal in the synthetic NH-kaolin suspension, but a high η (98.65%) was observed. It was found that the addition of the NZ01 could enhance the removal of NH as well as other pollutants in the surface water.
研究了天然沸石 (NZ) 作为 NH 去除吸附剂的应用。对三种类型的 NZ（即 NZ01、NZ02 和 NZ03）进行了表征，并评估了它们在水溶液中的 NH 吸附过程。pH 值对 NH 吸附的影响表明，与其他所用天然沸石相比，NZ01 具有最高的 NH 吸附容量。研究了 NZ01 在通过吸附混凝工艺处理饮用水的合成 NH-高岭土悬浮液中同时去除 NH 和浊度的应用。向系统中添加 NZ01 可将 NH 去除效率 (η) 从无 NZ01 时的 11.64%提高到添加 0.2 g/L NZ01 时的 41.86%。然而，浊度去除 (η) 没有受到显著影响，因为在所有研究参数范围内，η 均高于 98.0%。热力学和动力学数据分析表明，NH4 的去除符合 Temkin 等温模型和拟二级动力学模型。一般来说，浊度的去除是由于悬浮体系中的明矾使不稳定的固体颗粒絮凝。地表水的 η 为 29.31%，低于合成 NH-高岭土悬浮液中的去除率，但观察到高的 η（98.65%）。结果发现，添加 NZ01 可以增强地表水对 NH 及其他污染物的去除效果。
