Mandal S, Mayadevi S
Chemical Engineering and Process Development Division, National Chemical Laboratory, Pune, India.
Chemosphere. 2008 Jun;72(6):995-8. doi: 10.1016/j.chemosphere.2008.03.053. Epub 2008 May 12.
Cellulose supported layered double hydroxides (CSLDHs) were synthesized and tested for adsorption of fluoride in aqueous medium. Three samples of cellulose supported LDHs were synthesized by varying the LDH loading on cellulose. The raw cellulose, unsupported LDH and cellulose supported LDHs were characterized by XRD, SEM and BET surface area. Batch adsorption as well as fixed-bed column experiments were performed for determining the fluoride adsorption characteristics of CSLDHs. The fluoride adsorption properties of CSLDHs were found to be superior to that of reported adsorbents, including activated alumina and carbon nanotubes. Defluoridation capacity of the CSLDHs was 2-4 times higher than that of unsupported LDH. The cellulose supported LDH, CSLDH-50, having an LDH loading of 27% showed maximum fluoride uptake capacity (5.29 mg g(-1) of CSLDH, 25.18 mg g(-1) of LDH) in fixed-bed column study.
合成了纤维素负载层状双氢氧化物（CSLDHs），并对其在水介质中吸附氟化物的性能进行了测试。通过改变纤维素上LDH的负载量，合成了三个纤维素负载LDHs样品。采用X射线衍射（XRD）、扫描电子显微镜（SEM）和比表面积分析仪（BET）对原始纤维素、未负载LDH和纤维素负载LDHs进行了表征。进行了间歇吸附和固定床柱实验，以确定CSLDHs对氟化物的吸附特性。结果表明，CSLDHs对氟化物的吸附性能优于已报道的吸附剂，如活性氧化铝和碳纳米管。CSLDHs的除氟能力比未负载LDH高2-4倍。在固定床柱实验中，负载量为27%的纤维素负载LDH（CSLDH-50）表现出最大的氟化物吸附容量（每克CSLDH为5.29毫克，每克LDH为25.18毫克）。
