Institute for Sanitary Engineering, Water Quality and Solid Waste Management, University of Stuttgart, Bandtäle 2, 70569 Stuttgart, Germany E-mail:
Water Sci Technol. 2020 Jan;81(1):10-20. doi: 10.2166/wst.2020.055.
Phosphonates are widely used in various industries. It is desirable to remove them before discharging phosphonate-containing wastewater. This study describes a large number of batch experiments with adsorbents that are likely suitable for the removal of phosphonates. For this, adsorption isotherms for four different granular ferric hydroxide (GFH) adsorbents were determined at different pH values in order to identify the best performing material. Additionally, the influence of temperature was studied for this GFH. A maximum loading for nitrilotrimethylphosphonic acid (NTMP) was found to be ∼12 mg P/g with an initial concentration of 1 mg/L NTMP-P and a contact time of 7 days at room temperature. Then, the adsorption of six different phosphonates was investigated as a function of pH. It was shown that GFH could be used to remove all investigated phosphonates from water and, with an increasing pH, the adsorption capacity decreased for all six phosphonates. Finally, five adsorption-desorption cycles were carried out to check the suitability of the material for multiple re-use. Even after five cycles, the adsorption process still performed well.
膦酸盐被广泛应用于各个行业。在排放含膦酸盐的废水之前，将其去除是很有必要的。本研究描述了大量的吸附剂批量实验，这些吸附剂可能适合用于去除膦酸盐。为此，在不同的 pH 值下确定了四种不同的颗粒状氢氧化铁 (GFH) 吸附剂的吸附等温线，以确定性能最佳的材料。此外，还研究了温度对这种 GFH 的影响。在室温下，当起始浓度为 1mg/L 的 NTMP-P 接触 7 天后，发现最大的亚氨基三亚甲基膦酸 (NTMP) 负载量约为 12mg P/g。然后，研究了六种不同的膦酸盐的吸附与 pH 值的关系。结果表明，GFH 可用于从水中去除所有研究的膦酸盐，随着 pH 值的增加，所有六种膦酸盐的吸附容量都降低了。最后，进行了五次吸附-解吸循环实验，以检查材料的多次重复使用的适用性。即使经过五次循环，吸附过程仍然表现良好。
