谷壳源胺基修饰的石墨烯纳米纤维对水样中酸性大红GR脱除性能研究

Husk derived amino modified graphene nanofiber absorption removal for acid brilliant scarlet GR in water

采用典型偶氮染料酸性大红GR为模板污染物,以制得的谷壳源胺基修饰的石墨烯纳米纤维(aGRNF)为吸附脱除材料,深入研究了水样中模板污染物酸性大红GR的脱除效果。分别研究了脱除时间、水样pH、aGRNF添加量及染料起始浓度等不同因素对酸性大红GR染料的脱除效果的影响。研究结果表明,制得的aGRNF与酸性大红GR间极易通过氢键、π-π键等形成弱相互作用,使得吸附脱除效果更为显著,常温下,小剂量aGRNF纳米材料即可有效脱除0.2~4.0mg/mL较宽浓度范围的水样中酸性大红GR污染物,在酸性大红GR初始浓度为1.0mg/mL,aGRNF用量为1.5mg,脱除时间为120min条件下,aGRNF对酸性大红GR的脱除效果最好,脱除率最高达到97.1%,充分展现了该纳米材料在水质净化领域的应用潜力。

The typical azo dye acid brilliant scarlet GR was chosen for the template contaminants in water.Amino functionalized graphene nanofiber（aGRNF）was used as the absorption agent for the removal of acid brilliant scarlet GR in water.Different experimental conditions such as the removal time,pH value,the amount of aGRNF agent as well as starting concentration of acid brilliant scarlet GR were studied to find optimal removal conditions for aqueous template dye.Hydrogen bonds together withπ-πbonds can be formed between the prepared aGRNF and acid brilliant scarlet GR,which was helpful for such azo dye removal.Investigations found that an optimal removal efficiency of 97.1% after 120 min can be achieved readily at acid brilliant scarlet GR concentrations range of 0.2~4.0 mg/mL.When the initial concentration of acid brilliant scarlet GR was 1.0 mg/mL,with the addition of aGRNF（1.5 mg）,the highest removal rate of 97.1% could be obtained readily when the removal time was controlled at 120 min,providing novel insights for broad potential water purification applications of prepared aGRNF nanocomposites.