分别采用绿色还原剂抗坏血酸(AA)和单宁酸(TA)对氧化石墨烯(GO)进行还原,制得还原氧化石墨烯(RGO)和TA修饰的还原氧化石墨烯(RGOA)。通过对RGO和RGOA进行表征和测试。结果表明:在水溶液体系中AA和TA均可有效地还原GO。制得的RGO和RGOA形貌、亲水性和导电性存在显著区别:RGO为具有较大比表面积且碎裂、无序固体结构,电导率显著提高,与RGOA相比还原程度更高,但亲水性较差;RGOA则由于TA的多酚羟基的引入,呈现为膨胀卷曲絮状结构,电导率有所提升,亲水性得到了明显的改善。
Green reducing agents,ascorbic acid (AA) and tannic acid (TA),were used to reduce graphene oxide (GO),yielding two types of reduced graphene oxide (RGO) and TA-modified reduced graphene oxide (RGOA),respectively.It was found that both AA and TA could effectively reduce GO in aqueous solutions through the characterization and testing of RGO and RGOA.The prepared RGO and RGOA exhibited significant differences in morphology,hydrophilicity,and conductivity.RGO was a fragmented and disordered solid structure with a larger specific surface area.The electrical conductivity was significantly increased,and the reduction degree was higher than RGOA,but the hydrophilicity was poor.In contrast,RGOA presented an expanded and curled flocculent structure due to the introduction of the polyphenolic hydroxyl groups of TA,and the electrical conductivity was improved slightly and the hydrophilicity was enhanced obviously.
[1] Lonkar S P,Deshmukh Y S,Abdala A A.Recent advances in chemical modifications of graphene[J].Nano Research,2015,8(4):1039-1074.
[2] Hou D,Liu Q,Cheng H,et al.Chrysanthemum extract assisted green reduction of graphene oxide[J].Materials Chemistry and Physics,2016,183:76-82.
[3] Thakur S,Karak N.Green reduction of graphene oxide by aqueous phytoextracts[J].Carbon,2012,50(14):5331-5339.
[4] De Silva K K H,Huang H H,Yoshimura M.Progress of reduction of graphene oxide by ascorbic acid[J].Applied Surface Science,2018,447:338-346.
[5] Lim M Y,Shin H,Shin D M,et al.Poly(vinyl alcohol) nanocomposites containing reduced graphene oxide coated with tannic acid for humidity sensor[J].Polymer,2016,84:89-98.
[6] Cai G,Xu Z,Yang M,et al.Functionalization of cotton fabrics through thermal reduction of graphene oxide[J].Applied Surface Science,2017,393:441-448.
[7] Zhao X,Gnanaseelan M,Jehnichen D,et al.Green and facile synthesis of polyaniline/tannic acid/rGO composites for supercapacitor purpose[J].Journal of Materials Science,2019,54(15):10809-10824.
[8] Chen H,Wang M,Wang L,et al.Enhanced separation performance of Hg2+ in desulfurization wastewater using a tannin acid reduced graphene oxide membrane[J].Separation and Purification Technology,2021,274:119017.
[9] De Silva K K H,Huang H H,Joshi R K,et al.Chemical reduction of graphene oxide using green reductants[J].Carbon,2017,119:190-199.
[10] Zhang J,Yang H,Shen G,et al.Reduction of graphene oxide vial-ascorbic acid[J].Chemical Communications,2010,46(7):1112-1114.
[11] Lei Y,Tang Z,Liao R,et al.Hydrolysable tannin as environmentally friendly reducer and stabilizer for graphene oxide[J].Green Chemistry,2011,13(7):1655-1658.
[12] Yao G,Bi W,Liu H.pH-responsive magnetic graphene oxide/poly(NVI-co-AA) hydrogel as an easily recyclable adsorbent for cationic and anionic dyes[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2020,588:124393.
[13] Yao G,Liu X,Zhang G,et al.Green synthesis of tannic acid functionalized graphene hydrogel to efficiently adsorb methylene blue[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2021,625:126972.
基金资助
国家自然科学基金(11965015);内蒙古自治区高等学校青年科技英才支持计划(NJYT22072);内蒙古科技大学优秀青年基金项目(2019YQL05)
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