水热处理凹土对硝基苯废水的吸附研究
投稿时间:2014-01-22  修订日期:2014-04-08  点此下载全文
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作者单位E-mail
许晨红  淮阴工学院
江苏省环境监测中心S南京 
xuchenhong@aliyun.com 
张静 江苏省太湖水质监测中心站S南京  
马喜君 淮阴工学院  
基金项目:淮阴工学院科研基金HGC1302
中文摘要:天然凹土由于强度低,在用于废水处理后形成泥浆难以处理。本文利用水热处理,在不改变凹土结构的情况下,形成强度较高的凹土滤料,以达到回收再利用的目的。 扫描电子显微镜(SEM)、比表面孔径测试结果表明,该滤料微观结构呈网络状,比表面积明显增大、孔径略有缩小。滤料的抗压测试显示其强度显著增大。硝基苯的吸附实验表明,在前6h处于快速吸附阶段,在8h时达到平衡,单位吸附量为24mg/g;滤料对硝基苯的吸附量随着溶液初始浓度的增加几乎成比例增加;在pH=9时吸附量最大,为23.77mg/g;对低浓度的硝基苯溶液,当投加量为51.3g/L时去除率最大,达到93%。水热处理的凹土滤料对硝基苯废水有很好的处理效果。
中文关键词:水热合成  凹土 硝基苯  吸附
 
Adsorption of Nitrobenzene in Waste Water by Hydrothermal Synthesized Attapulgite
Abstract:Natural attapulgite was difficult to recycle for low compressive strength. To increase material strength , Attapulgite-based filter was treated by hydrothermal synthesizing. Microstructure, surface area and pore size were investigated by scanning electron microscopy (SEM), Brunauer-Emmett-Teller method (BET) and Barrett-Joiner-Halenda method(BJH). SEM images showed that the attapulgite nanorods formed consecutive space network. Their BET surface area was significantly increased , BJH average pore size was slightly decreased. Their compressive strength was obviously increased. The adsorption of nitrobenzene was in fast adsorption within 6h and reached equilibrium after 8h. The maximum adsorption capacity was 24 mg/g. The adsorption capacity was almost linearly increased with the increase of nitrobenzene concentration. The adsorption of aniline was best at pH 9 . In low concentration, the removal rate for nitrobenzene reached the maximum at 93% when the dosing quantity of filter was 51.3g/L. The results demonstrated that this filter is an effective adsorbent for the removal of nitrobenzene in water.
keywords:hydrothermal  synthesis, attapulgite, nitrobenzene, adsorption
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