title: High performance agar/graphene oxide composite aerogel for methylene blue removal.
abstract: A novel three-dimensional (3D) agar/graphene oxide (AGO) composite aerogel was prepared by a vacuum freeze drying method. The AGO aerogel was tested for its adsorption capacity of methylene blue (MB) and was found to have a maximum adsorption capacity of 578mg/g, as determined from the Langmuir isotherm. The adsorption kinetic studies revealed that adsorption followed pseudo-second-order model. The thermodynamic parameters calculated from the Van't Hoff equation indicate that the adsorption was an endothermic and spontaneous process. The adsorption mechanism may be attributed to electrostatic interaction between MB and AGO aerogel. Furthermore, the AGO aerogel can easily be recycled with a dilute NaOH solution wash, retaining over 91% of the adsorption capacity after recycling three times.
authors.affiliation: Laboratory of Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.
authors.forename: Long
authors.initials: L
authors.lastname: Chen
authors.affiliation: Laboratory of Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, 308 Ningxia Road, Qingdao 266071, China; College of Mechanical and Electrical Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, China. Electronic address: liyanhui@tsinghua.org.cn.
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Li
authors.affiliation: Laboratory of Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.
authors.forename: Qiuju
authors.initials: Q
authors.lastname: Du
authors.affiliation: Laboratory of Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.
authors.forename: Zonghua
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Laboratory of Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.
authors.forename: Yanzhi
authors.initials: Y
authors.lastname: Xia
authors.affiliation: SDU& Rice Joint Center for Carbon Nanomaterials, Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA.
authors.forename: Emily
authors.initials: E
authors.lastname: Yedinak
authors.affiliation: SDU& Rice Joint Center for Carbon Nanomaterials, Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA.
authors.forename: Jun
authors.initials: J
authors.lastname: Lou
authors.affiliation: SDU& Rice Joint Center for Carbon Nanomaterials, Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, China. Electronic address: lci@sdu.edu.cn.
authors.forename: Lijie
authors.initials: L
authors.lastname: Ci
keywords: Adsorption; Aerogel; Agar (PubChem CID: 76645041); Desorption; Graphene oxide; Graphite (PubChem CID: 5462310); Hydrochloric acid (PubChem CID: 313); Hydrogen bromide (PubChem CID: 784); Methylene blue; Methylene blue (PubChem CID: 6099); Nitric acid (PubChem CID: 944); Potassium permanganate (PubChem CID: 516875); Sodium hydroxide (PubChem CID: 14798); Sodium nitrate (PubChem CID: 24268); Sulphuric acid (PubChem CID: 1118)