Analytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
J Hazard Mater. 2012 Jan 30;201-202:193-201. doi: 10.1016/j.jhazmat.2011.11.065. Epub 2011 Nov 28.
Fluoride related health hazards (fluorosis) are a major environmental problem in many regions of the world. It affects teeth; skeleton and its accumulation over a long period can lead to changes in the DNA structure. It is thus absolutely essential to bring down the fluoride levels to acceptable limits. Here, we present a new inorganic-organic hybrid polymer sorbent having tailored fixed-sites for fluoride sorption. The matrix supported poly (bis[2-(methacryloyloxy)-ethyl]phosphate) was prepared by photo-initiator induced graft-polymerization in fibrous and microporous (sheet) host poly(propylene) substrates. These substrates were conditioned for selective fluoride sorption by forming thorium complex with phosphate groups on bis[2-methacryloyloxy)-ethyl] phosphate (MEP). These tailored sorbents were studied for their selectivity towards fluoride in aqueous media having different chemical conditions. The fibrous sorbent was found to take up fluoride with a faster rate (15 min for ≈76% sorption) than the sheet sorbent. But, the fluoride loading capacity of sheet sorbent (4,320 mg kg(-1)), was higher than fibrous and any other sorbent reported in the literature so far. The sorbent developed in the present work was found to be reusable after desorption of fluoride using NaOH solution. It was tested for solid phase extraction of fluoride from natural water samples.
氟化物相关的健康危害（氟中毒）是世界上许多地区的一个主要环境问题。它会影响牙齿和骨骼，其在体内的长期积累会导致 DNA 结构发生变化。因此，将氟化物水平降低到可接受的限度是绝对必要的。在这里，我们提出了一种新的无机-有机杂化聚合物吸附剂，具有针对氟化物吸附的定制固定位。通过在纤维状和微孔（片状）主体聚丙烯基质上用光引发剂诱导接枝聚合制备了基质支撑的聚[双[2-（甲基丙烯酰氧基）乙基]磷酸酯]。通过在双[2-（甲基丙烯酰氧基）乙基]磷酸酯（MEP）上形成与磷酸盐的钍络合物，对这些基质进行了选择性氟吸附的条件处理。研究了这些定制吸附剂在具有不同化学条件的水介质中对氟的选择性。与片状吸附剂（15 分钟即可 ≈76%的吸附）相比，纤维状吸附剂对氟的吸附速度更快。但是，片状吸附剂的氟负载量（4320 mg kg(-1)）高于纤维状吸附剂和迄今为止文献中报道的任何其他吸附剂。使用 NaOH 溶液解吸氟化物后，发现本工作中开发的吸附剂可重复使用。它已被测试用于从天然水样中固相萃取氟化物。
