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以新型碳基纳米材料—纳米竹炭为研究对象,考察其在蒸馏水、无机盐、表面活性剂等体系中的沉降特征。试验发现,蒸馏水体系中纳米竹炭静置68 d后沉降率约为90%,而无机盐体系中不同浓度(2~50 mg/L)的纳米竹炭10 d内则大部分基本沉降完全,说明离子强度对其沉降性能影响较大。纳米竹炭沉降于试管底部,在蒸馏水体系中堆积紧密,在无机盐体系中堆积则相对蓬松。表面活性剂(十六烷基三甲基溴化铵,HTAB)的添加能降低纳米竹炭的沉降速率,且随着HTAB浓度增大沉降率越小。但表面活性剂浓度超过其临界胶束浓度后,对纳米竹炭的分散性能的增强不明显。
The new carbon-based nanomaterials, nano-bamboo charcoals, were investigated for their sedimentation characteristics in distilled water, inorganic salts and surfactants. The results showed that the sedimentation rate of nano-bamboo charcoal in distilled water was about 90% after standing for 68 days, while most of the nano-bamboo charcoals with different concentrations (2 ~ 50 mg / L) The strength of its settlement has a greater impact. Nanocrystalline bamboo charcoal settled in the bottom of the tube, packed tightly in the distilled water system, and accumulated in the inorganic salt system was relatively fluffy. The addition of surfactant (hexadecyltrimethylammonium bromide, HTAB) can reduce the sedimentation rate of nano-bamboo charcoal, and the sedimentation rate decreases with the concentration of HTAB. However, when the surfactant concentration exceeds its critical micelle concentration, the dispersibility of nano bamboo charcoal is not obviously enhanced.