The rapid coagulation of graphene oxide on La-doped layered double hydroxides

Wang, Jian; Li, Yinshi; Chen, Wanying; Peng, Junxiang; Hu, Jun; Chen, Zhongshan; Wen, Tao; Su, Lu; Chen, Yuantao; Hayat, Tasawar; Ahmad, Bashir; Wang, Xiangke

doi:10.1016/j.cej.2016.10.053

Cited by 44 publications

(14 citation statements)

References 30 publications

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“…The high resolution of N 1s can be resolved into three different peaks at 400.7 eV, 399.4 eV and 398.1 eV (Figure C), which were assigned to the protonated amine (‐NH + ), the undoped amine‐like nitrogen atoms (‐NH‐) and the imine‐like (‐N≡) groups, respectively ,. Cr(VI) adsorption process, the proportion of ‐NH + sharply decreased from 44% to 31%, and ‐NH‐ decreased from 56% to 52% (Table ), which confirmed the redox reaction between ‐NH + and ‐NH‐ in PANI/AlOOH and Cr(VI) .…”

Section: Resultsmentioning

confidence: 55%

Synthesis of PANI/AlOOH composite for Cr(VI) adsorption and reduction from aqueous solutions

et al. 2019

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In this study, polyaniline rafted to the surface of AlOOH (PANI/ AlOOH) composites were successfully synthesized and applied for chromium (Cr(VI)) adsorption from aqueous solutions. Cr(VI) adsorption isotherms were described by Langmuir model well and the maximum adsorption capacity was 66.77 mg/g at pH = 5 and T = 298 K. Cr(VI) adsorption was attributed to chemisorption and outer-sphere surface complexation. The interaction mechanism was further investigated by Fourier transform infrared spectroscopy, transmission electron microscopy-energy dispersive spectroscopy and X-ray photoelectron spectroscopy techniques, and the results suggested the partially reduction of Cr(VI) to Cr(III). Cr(VI) removal was mainly related with the electrostatic attraction and chelation of different Cr(VI)/Cr(III) species with protonated nitrogen-containing functional groups (-NH + , -NH-) on PANI/AlOOH.

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Section: Resultsmentioning

confidence: 55%

Synthesis of PANI/AlOOH composite for Cr(VI) adsorption and reduction from aqueous solutions

et al. 2019

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“…Besides membranes chemically modified GO and GO based composites are effective adsorbents for removal various pollutions from wastewater [110] including heavy metal ions [111][112][113]. Moreover the GO based sorbents can be successfully regenerated for subsequent use [114,115].…”

Section: Adsorbentsmentioning

confidence: 99%

Graphene Oxide and Derivatives: The Place in Graphene Family

2019

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Graphene oxide (GO) is useful and promising material for graphene based applications in electronic, optics, chemistry, energy storage, and biology. At the beginning of graphene history GO was only a simple and cheap step for preparation of single and multilayer graphene films and bulk structures by reduction. The further studies revealed the substantial structure imperfection of graphene oxide derived materials due to the defects in initial graphite and incompletion of reducing process. However, the results of recent research demonstrated a great amount of unique chemical, optical and electronic properties of graphene oxide that allow regarding it as independent nanomaterial possessing a large area of applications. In general, it represents the ultra-large organic molecule containing 2D carbon mesh. Unlike conventional graphene it provides wide range of chemical methods for attachment of various functional groups to its surface for control optical transparency, electrical and thermal conductance. Recently developed methods for preparation of graphene oxide derivatives saturated by carboxyl groups open the new attractive application areas in green technologies including energy storage and utilizing nuclear wastes. The goal of the review is to summarize the results of recent studies of graphene oxide, derivatives and reveal the most promising directions to focus the efforts of researchers.

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“…In this sense, the presence of aromatic rings in the adsorbate molecule contributes highly to π−π interactions with graphenebased adsorbents. Hydrogen bonds and electrostatic interactions are the dominant heteroaggregation mechanism of GO with layered double hydroxides and oxides, such as TiO 2 , MgO, ZnO, and positively charged mineral clays (Wang et al, 2017e;Wang et al, 2016a;Zou et al, 2016b). Moreover, electrostatic interactions govern the adsorption of ionic species, such as metals and some small dyes, which frequently are used in their ionized form.…”

Section: Functionalized Graphene Its Interactions and Characterizationmentioning

confidence: 99%

Functionalized Graphene-Based Materials as Innovative Adsorbents of Organic Pollutants: A Concise Overview

Fraga

Carvalho

Ghislandi

et al. 2019

Braz. J. Chem. Eng.

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The functionalization of graphene nanosheets is the cutting edge of materials sciences nowadays. Such research promotes the development of innovative, low cost and highly capable sorbents. This review article aims to assemble the available information on functionalized graphene used for the adsorption of organic pollutants and establishes a critical comparison between the data reported in the literature. Various optimal experimental conditions (pH, temperature, contact time, adsorbent dosage) and adsorbent characterization methods (FTIR, Raman, XPS spectra, XRD, TEM and AFM) have been listed to enlighten adsorption mechanisms, capacity and limiting aspects. Moreover, adsorption isotherms, kinetics and thermodynamic data of different functionalized graphene-based materials towards a wide range of organic pollutants were analyzed and tabulated. In each evaluation topic, environmental and human health protection is subject for discussion, as well as the scientific breakthrough works available in high impact journals in the field.

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The rapid coagulation of graphene oxide on La-doped layered double hydroxides

Cited by 44 publications

References 30 publications

Synthesis of PANI/AlOOH composite for Cr(VI) adsorption and reduction from aqueous solutions

Synthesis of PANI/AlOOH composite for Cr(VI) adsorption and reduction from aqueous solutions

Graphene Oxide and Derivatives: The Place in Graphene Family

Functionalized Graphene-Based Materials as Innovative Adsorbents of Organic Pollutants: A Concise Overview

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