摘要
以硝酸镍为催化剂前驱体,C2H2为碳源,H2为还原气,N2为载气,采用化学气相沉积法(CVD)在活性炭纤维(ACFs)毡体的纤维表面催化生长碳纳米管(CNTs),制备ACF/CNT复合材料。经测定,所制复合材料比表面积可达62.56 m2/g;扫描电镜分析表明,CNTs在ACFs表面分布均匀而致密,经过表面修饰可以作为1种良好的吸附材料。选择低浓度的六价铬(Cr(Ⅵ))溶液进行吸附研究,考察振荡时间、溶液pH值以及溶液的初始浓度等因素对吸附行为的影响。实验结果表明,初始Cr(Ⅵ)浓度为1 mg/L,在25℃时,随着振荡时间的增长溶液中Cr(Ⅵ)的脱除率逐渐增加,在150 min时达到最大值49.48%。溶液中Cr(Ⅵ)的脱除率随着pH的减小而增大,当pH值为2.0时脱除率达91.50%,对Cr(Ⅵ)的吸附量随着溶液初始浓度的增加而增大,但是当初始浓度到达5.0 mg/L时,脱除效率到达最大值后开始降低。并对ACF/CNT复合材料的吸附机制进行了探讨。
ACF/CNT composites were prepared by carbon nanotubes（CNTs） growing on the surface of activated carbon fibers（ACFs） through chemical vapor deposition（CVD）,using Ni（NO3）2-6H2O as catalyst precursor,C2H2 as carbon source,H2 as reduction gas and N2 as carrier gas.Specific surface area of the composite is quite great and reaches 62.56 m2/g.SEM analysis shows that CNTs are well-distributed and densified on the surface of ACFs and ACF/CNT composites can become a good adsorption material by being surface modified.A research was carried out with low concentration Cr（Ⅵ） as adsorbate and effects of agitation time,solution pH and initial concentration of Cr（Ⅵ） on adsorption ability were explored.The results show that the removal ratio of Cr（Ⅵ） increases with increasing agitation time when the initial concentration is 1 mg/L and the temperature is 25 ℃,and the maximum value of 49.48% is achieved at the agitation time of 150 minutes.The removal ratio of Cr（Ⅵ） increases with decreasing pH value,and the removal ratio achieves 91.50% when pH value is 2.0.The adsorption capacity of Cr（Ⅵ） increases with increasing initial Cr（Ⅵ） concentration,but the removal ratio reaches maximum value then decreases when the initial concentration is 5.0 mg/L.Adsorption mechanism of ACF/CNT composites is discussed according to experiment results.
出处
《粉末冶金材料科学与工程》
EI
2011年第2期285-289,共5页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(50802115)
国家自然科学基金委员会创新研究团体科学基金资助项目(50721003)
