Preparation, characterization, and application of mesoporous silica-grafted graphene oxide for highly selective lead adsorption

Li, Xiaohong; Wang, Zheng; Li, Qing; Ma, Jiaxian; Zhu, Mingzi

doi:10.1016/j.cej.2015.03.104

Cited by 130 publications

(47 citation statements)

References 41 publications

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“…5 whereas in Table 2 literature data concerning the sorption capacity of several sorbents (for the same metals and under similar experimental conditions) are presented for comparison [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63]. Taking into consideration the literature data and the findings of this study one can conclude that the investigated MoO 3 can be used for sorption of Ba, Cs and Eu from aqueous solutions as well as is an excellent sorbent for removal of Pb and U.…”

Section: Sorption Isothermsmentioning

confidence: 74%

Thermally modified molybdenum oxide as a potential sorbent for the removal of metal cations from aqueous solutions

Kapnisti

Noli

Arvanitidis

et al. 2015

J Radioanal Nucl Chem

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The effectiveness of a low cost sorbent produced by thermal modification of ammonium heptamolybdate (AHM) in adsorption of radionuclides and heavy metals was investigated. The product was characterized by XRD, SEM and Raman spectroscopy. Sorption experiments were performed in Pb, U, Cs, Ba and Eu solutions (pH 2.0-6.0). The obtained isotherms were simulated by Langmuir and Freundlich isotherms and kinetics data were used in order to evaluate the sorption mechanism. The results showed the high and selective efficiency of the AHM-derived MoO 3 especially in Pb and U removal whereas the desorption experiments revealed its environmental applicability under real conditions for the investigated metal cations.

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Section: Sorption Isothermsmentioning

confidence: 74%

Thermally modified molybdenum oxide as a potential sorbent for the removal of metal cations from aqueous solutions

Kapnisti

Noli

Arvanitidis

et al. 2015

J Radioanal Nucl Chem

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“…As seen in the table, the adsorption coefficients of Cu(II) onto Cu(II)‐IIP reveal the fact the adsorption obeys Langmuir adsorption model with higher R 2 (0.9919–0.9946). The adsorption data of Langmuir isotherm indicates the adsorption behavior that the active sites onto absorbent can be considered to be a monolayer adsorption process . Meanwhile, the Freundlich constants 1/ n are smaller than 1 over the entire concentration range studied, indicating a well process.…”

Section: Resultsmentioning

confidence: 96%

Tailor‐made ion‐imprinted polymer based on functionalized graphene oxide for the preconcentration and determination of trace copper in food samples

Liu

Qiu

Liu

et al. 2016

J of Separation Science

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A tailor-made Cu(II) ion-imprinted polymer based on large-surface-area graphene oxide sheets has been synthesized for the preconcentration and determination of trace copper from food samples by solid-phase extraction. Attributed to the ultrahigh surface area and hydrophilicity of graphene oxide, the Cu(II) ion-imprinted polymer prepared by the surface ion-imprinting technique exhibited a high binding capacity and a fast adsorption rate under the optimized experimental conditions. In the static adsorption experiments, the maximum adsorption capacity of Cu(II) ion-imprinted polymer is 109.38 mg/g at 25°C, which is much higher than that of the nonimprinted polymer (32.12 mg/g). Meanwhile, the adsorption is very rapid and equilibrium is reached after approximately 30 min. The adsorption mechanism is found to follow Langmuir adsorption model and the pseudo-second-order adsorption process. The Cu(II) ion-imprinted polymer was used for extracting and detecting Cu(II) in food samples combined with graphite flame atomic adsorption spectrometry with high recoveries in the range of 97.6-103.3%. The relative standard deviation and limit of detection of the method were evaluated as 1.2% and 0.37 μg/L, respectively. The results showed that the novel absorbent can be utilized as an effective material for the selective enrichment and determination of Cu(II) from food samples.

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“…The absence of sharp Bragg peaks in the pattern of NMSZ, with only ab road halo centered at 2q = 248,c onfirms its amorphous character.I nc ontrast, the pattern of GO-NMSZ shows not only the amorphous halo due to NMSZ, but also a sharp intense peak at 2q = 10.58,w hich is attributedt ot he (002) plane of GO, [16] corresponding to an interlayer distance of 8.43 ,a nd confirms preservation of the layer structure. It has been reported that the peak at 2q = 10.58 shifts to around 26.18,i ndicating ad ecreased interlayer spacinga saresult of the reduction of GO, [10,17] which often happens when GO is modified with Fe 3 O 4 particles. [18] The results of the present study suggestp reservation of the oxygen containing groups in the composites.…”

Section: Resultsmentioning

confidence: 99%

Preparation of an Anti‐Aggregation Silica/Zinc/Graphene Oxide Nanocomposite with Enhanced Adsorption Capacity

Yue

Cao

Yang

et al. 2019

Chemistry A European J

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Nanomaterials play as ignificant role in adsorption treatment of dye wastewater,b ut irreversible aggregation of nanoparticles poses as ignificant problem. In this work, nanomesoporous zinc-doped silicate (NMSZ) was prepared by an in situ method. To preventa gglomeration, NMSZ was covalently bonded to grapheneo xide (GO) sheets to form a nano-silica/zinc/grapheneo xide composite (GO-NMSZ), aimed at removal of cationic dye methylene blue (MB). For comparison, undoped mesoporouss ilica (MS) was also synthesizeda nd modifiedt oo btain as ilica/graphene oxide composite (GO-MS). The materials were characterized by powderX RD, SEM, FTIR spectroscopy,T EM, nitrogen sorp-tion, and X-ray photoelectron spectroscopy (XPS). Preservation of the oxygen-containingg roups of GO in the composites led to highera dsorptioncapacities. The best GO-NMSZ composite exhibited an enhanced adsorption capacity of 100.4 mg g À1 for MB compared to those of undoped GO-MS (80.1 mg g À1 )a nd nongrafted NMSZ (55.7 mg g À1 ). The nonselectivec haracter of GO-NMSZ is demonstrated by effective adsorption of anionic dye Congo red (127.4 mg g À1 )a nd neutral dyei satin (289.0 mg g À1 ). The adsorption kinetics, adsorptioni sotherms,a nd at hermodynamic study suggested that MB adsorption occurs by chemisorptiona nd is endothermic in nature.

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Preparation, characterization, and application of mesoporous silica-grafted graphene oxide for highly selective lead adsorption

Cited by 130 publications

References 41 publications

Thermally modified molybdenum oxide as a potential sorbent for the removal of metal cations from aqueous solutions

Thermally modified molybdenum oxide as a potential sorbent for the removal of metal cations from aqueous solutions

Tailor‐made ion‐imprinted polymer based on functionalized graphene oxide for the preconcentration and determination of trace copper in food samples

Preparation of an Anti‐Aggregation Silica/Zinc/Graphene Oxide Nanocomposite with Enhanced Adsorption Capacity

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