Anchoring H3PW12O40 on 3-aminopropyltriethoxysilane modified graphene oxide: enhanced adsorption capacity and photocatalytic activity toward methyl orange

2015 ◽  
Vol 39 (5) ◽  
pp. 3719-3727 ◽  
Author(s):  
Weiming Xiao ◽  
Panpan Zhao ◽  
Shengjun Deng ◽  
Ning Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Methyl Orange ◽  
Adsorption Capacity ◽  
Impregnation Method ◽  
Modified Graphene Oxide ◽  
Enhanced Adsorption ◽  
Modified Graphene

A novel PW12/GO–NH2 hybrid was obtained via an impregnation method, which exhibited enhanced adsorption capacity and photocatalytic activity.

Poly(ethylene imine)-modified graphene oxide with improved colloidal stability and its adsorption of methyl orange

2014 ◽  
Vol 70 (5) ◽  
pp. 851-857 ◽  
Author(s):  
Hongxi Liu ◽  
Ting Wu ◽  
Zhimin Wu ◽  
Yong Zhang ◽  
Keqin Xuan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Methyl Orange ◽  
Adsorption Capacity ◽  
Colloidal Stability ◽  
Ethylene Imine ◽  
Chemically Modified ◽  
Modified Graphene Oxide ◽  
Infrared Spectrometer ◽  
Poly Ethylene ◽  
Modified Graphene

Graphene oxide (GO) was chemically modified with poly(ethylene imine) (PEI) to improve its colloidal stability and was investigated as a potential adsorbent for the removal of methyl orange (MO). The synthesis of PEI-GO was verified with a Fourier transform infrared spectrometer and thermogravimetric analysis. A series of adsorption experiments were carried out to investigate the adsorption capacity of PEI-GO. Adsorption kinetics and thermodynamics studies were performed, and the thermodynamic parameters were calculated. The results showed that PEI could improve the colloidal stability of GO in aqueous solution, and the obtained PEI-GO showed a macroscopically homogeneous dispersion after more than three months. After standing for 90 days, the Brunauer–Emmett–Teller specific surface area of GO decreased from 353 to 214 m2 · g−1, while that of PEI-GO remained almost unchanged (from 432 to 413 m2 · g−1). The PEI-GO exhibited significantly faster kinetic and higher adsorption capacity for MO than GO. Moreover, PEI-GO had a good adsorption capacity in the acidic range, and the highest adsorption of MO occurred at pH = 6.0. The adsorption of MO on PEI-GO was an endothermic, spontaneous and physisorption process.

Efficient and Enhanced Adsorption of Methylene Blue on Triethanolamine-Modified Graphene Oxide

2019 ◽  
Vol 64 (4) ◽  
pp. 1816-1825 ◽  
Author(s):  
Jun Xu ◽  
Sisi Li ◽  
Feng Wang ◽  
Zhouxiaoshuang Yang ◽  
Hui Liu
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Modified Graphene Oxide ◽  
Enhanced Adsorption ◽  
Modified Graphene

Synthesis and characterization of a new magnetic adsorbent for removal of 4-nitrophenol: application of response surface methodology

2019 ◽  
Vol 80 (8) ◽  
pp. 1430-1442
Author(s):  
Reza Gholamnia ◽  
Mehrnoosh Abtahi ◽  
Reza Saeedi ◽  
Shokooh Sadat Khaloo
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Response Surface ◽  
Second Order ◽  
Quadratic Model ◽  
Maximum Adsorption Capacity ◽  
Modified Graphene Oxide ◽  
Pseudo Second Order ◽  
Modified Graphene ◽  
Graphene Oxide Sheets

Abstract Magnetic modified graphene oxide was synthesized as a new modified magnetic nano-composite (MMNC) by a simple sonochemical–hydrothermal method. The sonochemical reaction was employed to exfoliate, functionalize and decorate neomycin on graphene oxide sheets. Nickel ferromagnetic particles were synthesized by hydrothermal co-precipitation method and decorated on neomycin-modified graphene oxide. The morphology and chemical structure of MMNC were characterized by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction spectroscopy. The adsorption capability of MMNC for removal of phenolic compounds was assessed through adsorption of 4-nitrophenol (4-NP) from aqueous solution. The three-factor Box–Behnken design coupled with response surface method was applied to evaluate and optimize the important variables which affect the adsorption process. A significant quadratic model (p-value <0.05, R2(adj) = 0.9593) was derived using analysis of variance. The maximum adsorption capacity of 125.4 mg 4-NP/g MMNC at pH 6 was obtained, which was comparable in some cases and higher than most adsorbents reported in the literature. The presence of neomycin on graphene oxide sheets improved the maximum adsorption capacity of the nano-sorbent up to 28% (from 98.7 to 125.4 mg 4-NP/g adsorbent). The adsorption isotherms fitted well with the Langmuir model (Langmuir constant b = 0.064 l/mg, R2 = 0.9989) and the kinetic study showed that the nitrophenol uptake process followed the pseudo-second-order rate expression (R2 ≥ 0.9960, pseudo-second-order constant K2 ≥ 1.7 × 10−3).

Surface core–shell magnetic polymer modified graphene oxide-based material for 2,4,6-trichlorophenol removal

RSC Advances ◽  
2014 ◽  
Vol 4 (108) ◽  
pp. 63494-63501 ◽  
Author(s):  
Mei-Lan Chen ◽  
Jian-Qing Min ◽  
Sheng-Dong Pan ◽  
Mi-Cong Jin
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Ring Opening ◽  
Precipitation Polymerization ◽  
Core Shell ◽  
Distillation Precipitation Polymerization ◽  
Modified Graphene Oxide ◽  
Modified Graphene

A novel well-designed graphene oxide-based magnetic polymer (GO-Fe3O4@P) has been successfully synthesizedviadistillation–precipitation polymerization, ring-opening and amidation reactions and showed good adsorption capacity to 2,4,6-TCP.

Sign in / Sign up

Export Citation Format

Share Document