title: Graphene oxide as efficient high-concentration formaldehyde scavenger and reutilization in supercapacitor.
abstract: Graphene oxide (GO) was investigated as a low-cost and high-efficient scavenger for high-concentration formaldehyde in alkali media. It showed very high removal capacity, 411 mg of formaldehyde per milligram of GO, and strong resistant to temperature changes. Additionally, the used GO can be easily renewed by a simple electrochemical method. By analyzing the componential and electrochemical characterizations of GO before and after use, the results showed that the degradation mechanism of formaldehyde is a collaborative process of chemical oxidation and physical adsorption, and the former dominates the degradation process. With the aid of oxygen-containing groups in GO, most formaldehyde can be easily oxidized by GO in alkaline media (this is equivalent to GO was reduced by formaldehyde). On the other hand, the used GO (reduced GO, noted as rGO) exhibits more ideal electronic double-layer capacitor (EDLC) feature than GO, along with higher rate capacitance (up to 136 F g(-1) at 50 A g(-1)). In short, GO is not only an efficient formaldehyde scavenger, but the used GO (rGO) can serve as promising electrical energy storage material. This study provides new insights for us to reutilize the discarded adsorbents generated from the environmental protection.
authors.affiliation: State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: zhangjunyan@licp.cas.cn.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Liang
authors.affiliation: State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Bu
authors.affiliation: Lanzhou No. 1 Senior High School Gansu, Lanzhou 730030, China.
authors.forename: Yutian
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
authors.forename: Junyan
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D025802:Electric Capacitance; D055664:Electrochemical Techniques; D005557:Formaldehyde / Q000302:isolation & purification*; D006108:Graphite / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D010087:Oxides; D014874:Water Pollutants, Chemical; D005557:Formaldehyde; D006108:Graphite
keywords: Chemical oxidation; Degradation efficiency; Graphene oxide; High-concentration formaldehyde; Physical adsorption; Supercapacitor