Treatment of arsenic-contaminated groundwater by a low cost activated alumina adsorbent prepared by partial thermal dehydration
Treatment of arsenic-contaminated groundwater by a low cost activated alumina adsorbent prepared by partial thermal dehydration
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DOI：
10.5004/dwt.2009.857
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发表时间：
2009-11
影响因子：
1.1
通讯作者：
M. Sen;P. Pal
中科院分区：
文献类型：
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作者：
M. Sen;P. Pal
采用部分热脱水法制备低成本活性氧化铝基吸附剂，对受污染地下水中的砷进行了去除实验研究。对三水铝石前驱体进行部分热脱水，制备了具有高比表面积的活性氧化铝基吸附剂，并研究了脱水温度、停留时间、升温速率和粒径对吸附剂活性比表面积发展的影响。研究发现，操作参数对有效表面积开发有显著影响。测定了所有样品的表面积（氮吸附法）和着火损失。结果表明，在500℃快速加热系统中（升温速率200℃/min），脱水时间为30 min，吸附剂粒径为200目（85%），吸附剂表面积约为335 ~ 340m2 /g。测定了该吸附剂对砷的吸附量。
Experimental investigations were carried out to remove arsenic from contaminated groundwater by low cost activated alumina based adsorbent prepared by partial thermal dehydration. Activated alumina based adsorbent with high surface area was prepared following partial thermal dehydration of gibbsite precursor and an attempt was made to study the effects of dehydration temperature, residence time, rate of increase of temperature and particle size on development of active surface area of the adsorbent. The operating parameters were found to have significant effect on active surface area development. BET Surface area (by nitrogen adsorption) and ignition losses were determined for all the samples. It was found that an adsorbent of surface area of around 335–340 m2/g could be developed when dehydrated at 500°C for a residence time of 30 min in a rapid heating system (rate of increase of temperature 200°C/min) with particle size of 200 mesh (85%). The arsenic adsorption capacity of this adsorbent was determined...