Bruzzoniti M C, De Carlo R M, Rivoira L, Del Bubba M, Pavani M, Riatti M, Onida B
Department of Chemistry, University of Turin, Via Pietro Giuria 5, 10125, Turin, Italy.
Department of Chemistry, University of Florence, Via della Lastruccia 13, 50019, Sesto Fiorentino, Italy.
Environ Sci Pollut Res Int. 2016 Mar;23(6):5399-409. doi: 10.1007/s11356-015-5755-1. Epub 2015 Nov 13.
Within the last few years, the presence of bentazone herbicide has been observed in many water resources. For the first time, removal of bentazone using mesoporous silica was investigated revealing reversible adsorption. The adsorption isotherm was well described using the Freundlich model. The affinity towards bentazone is strongly affected by pH in the range of 2-7, decreasing with the increase of the pH, becoming negligible at the neutrality. Regeneration of the adsorbent was possible, and a recovery as high as 70 % was obtained using CH3OH-NaOH solution. Furthermore, appreciable recovery (47 %) was also obtained using water. Applications on the purification of lake water and wastewaters, both characterized by a significant organic carbon load, spiked with 2 mg L(-1) bentazone were tested, observing removal yields in the range of 61-73 %. Taking advantage of the fast adsorption kinetics observed, an in-flow purification treatment was set-up, with quantitative removal of bentazone from polluted water.
在过去几年里，许多水资源中都检测到了苯达松除草剂的存在。首次研究了使用介孔二氧化硅去除苯达松，结果表明存在可逆吸附。吸附等温线用弗伦德里希模型能很好地描述。在2至7的pH范围内，对苯达松的亲和力受pH值影响很大，随pH值升高而降低，在中性时可忽略不计。吸附剂可以再生，使用甲醇 - 氢氧化钠溶液可获得高达70%的回收率。此外，用水也可获得可观的回收率（47%）。对添加了2 mg L⁻¹苯达松的、具有显著有机碳负荷的湖水和废水进行净化应用测试，观察到去除率在61%至73%之间。利用观察到的快速吸附动力学，建立了流入式净化处理方法，可从污染水中定量去除苯达松。
