Effects of solution chemistry on the attachment of graphene oxide onto clay minerals

Lu, Xiaoyan; Lu, Taotao; Zhang, Haojing; Shang, Zhongbo; Chen, Jiuyan; Wang, Ying; Li, Deliang; Zhou, Yanmei; Qi, Zhichong

doi:10.1039/c8em00480c

Cited by 17 publications

(19 citation statements)

References 45 publications

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“…Interestingly, those two studies were conducted in soil, whereas all previous studies that detected GFNs in vivo were conducted using plants raised in growth medium. GO has been shown to exhibit varying degrees of affinity with different clay minerals [ 40 ], which would interfere with its absorption by plants. It is a reasonable conclusion that soil conditions are not conducive to the transport of GFNs into plants.…”

Section: The Fate Of Gfns In Plantsmentioning

confidence: 99%

The Effects of Graphene-Family Nanomaterials on Plant Growth: A Review

et al. 2022

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Numerous reports of graphene-family nanomaterials (GFNs) promoting plant growth have opened up a wide range of promising potential applications in agroforestry. However, several toxicity studies have raised growing concerns about the biosafety of GFNs. Although these studies have provided clues about the role of GFNs from different perspectives (such as plant physiology, biochemistry, cytology, and molecular biology), the mechanisms by which GFNs affect plant growth remain poorly understood. In particular, a systematic collection of data regarding differentially expressed genes in response to GFN treatment has not been conducted. We summarize here the fate and biological effects of GFNs in plants. We propose that soil environments may be conducive to the positive effects of GFNs but may be detrimental to the absorption of GFNs. Alterations in plant physiology, biochemistry, cytological structure, and gene expression in response to GFN treatment are discussed. Coincidentally, many changes from the morphological to biochemical scales, which are caused by GFNs treatment, such as affecting root growth, disrupting cell membrane structure, and altering antioxidant systems and hormone concentrations, can all be mapped to gene expression level. This review provides a comprehensive understanding of the effects of GFNs on plant growth to promote their safe and efficient use.

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Section: The Fate Of Gfns In Plantsmentioning

confidence: 99%

The Effects of Graphene-Family Nanomaterials on Plant Growth: A Review

et al. 2022

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“…O GO apresenta-se como um dos materiais carbonáceos mais relevantes da atualidade [98]. Foi preparado pela primeira vez no século XIX e, desde então, é produzido principalmente pelos métodos propostos por Brodie e Staudenmaier e pelo método Hummers, idealizado no final da década de 1950, por Williams Hummers [37,99].…”

Section: óXido De Grafeno: Propriedades E Reduçãounclassified

“…Por fim, é válido salientar que todo o desenvolvimento científico e tecnológico, independentemente de sua importância, deve provir com as devidas preocupações quanto aos impactos ambientais, uma vez que o uso indiscriminado tem apresentado o GO como contaminante de efluentes aquáticos [98]. Não obstante, diferentes argilominerais, dentre eles a MMT, podem interagir com o GO e serem explorados como estratégia de tratamento de efluentes [97].…”

Section: Materiais Híbridos Baseados Em Grafeno E Mmt: Obtenção E Propriedadesunclassified

“…Dessa forma, foi investigada a capacidade de adsorção do GO pelos argilominerais mediante experimentos em bateladas, sob diferentes condições químicas. O estudo promove uma discussão pertinente acerca das interações entre GO e MMT, que é essencial para um melhor entendimento mais acurado dos híbridos até então discutidos [98]. Verificou-se que as interações entre o GO e os argilominerais são fundamentalmente eletrostáticas e que foram mais efetivas nas regiões de defeitos cristalinos, como rugosidade da superfície, impurezas químicas, heterogeneidade de carga superficial dos minerais e superfícies de bordas, que levam à fixação do GO mesmo em condições desfavoráveis, corroborando as discussões sobre as interações necessárias para a formação de híbridos GO/MMT [125].…”

Section: Materiais Híbridos Baseados Em Grafeno E Mmt: Obtenção E Propriedadesunclassified

“…Outro resultado interessante é a influência do Ca 2+ interlamelar na adsorção de GO pelos argilominerais. Atestou-se que o aumento da concentração do íon Ca 2+ favoreceu o ancoramento de GO, porquanto o Ca 2+ atua como ponte entre a matriz inorgânica e o material carbonáceo, promovendo complexação por meio dos grupos carboxila, carbonila, hidroxila e fenol da superfície do GO [98].…”

Section: Materiais Híbridos Baseados Em Grafeno E Mmt: Obtenção E Propriedadesunclassified

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Híbridos de grafeno/montmorillonita e óxido de grafeno/montmorillonita como nanomateriais funcionais: uma visão da literatura atual

et al. 2021

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Resumo Os híbridos derivados de grafeno ou óxido de grafeno e o argilomineral montmorillonita são materiais cuja matriz do filossilicato oferece estabilização das camadas nanométricas das estruturas carbonáceas, além de melhoramento das propriedade físico-químicas e da biocompatibilidade. Por sua vez, o grafeno e seus derivados agregam novas funcionalidades à montmorillonita e ao aumento da reatividade. Os materiais funcionais resultantes do sinergismo entre os constituintes têm sido explorados em diferentes aplicações, como em processos de remediação ambiental por meio de adsorção e catálise, ciência de materiais, áreas biológicas e biomédicas. No âmbito dessa revisão, as principais rotas para obtenção dos híbridos de grafeno e derivados com montmorillonita são apresentadas, relacionando os fatores estruturais e interações entre os constituintes para formação dos compósitos. Ainda os principais métodos de caracterização são discutidos e as aplicações mais recentes são relacionadas às características estruturais, morfológicas, térmicas e texturais.

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Impact of heavy metal cations on deposition and release of clay colloids in saturated porous media

Shi

Wang

Chu

et al. 2022

Vadose Zone Journal

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While the facilitated transport of heavy metals by colloids such as clay particles has been widely recognized, the influence of heavy metals on transport of the colloids has received much less attention. This study conducted saturated column experiments to systematically examine influence of multivalent heavy metal cations on transport of natural clay colloids and fullerene nC60 nanoparticles in glass bead porous media. Results showed that the presence of Cd2+ in the solution can cause more deposition of clay colloids in glass beads compared to Ca2+ at a given ionic strength (IS), and the subsequent release by IS reduction was less, demonstrating that the presence of Cd2+ increased the irreversibility of attachment. When the glass beads were initially adsorbed with Ca2+ and Cd2+, the release of clay colloids was significantly reduced due to strong cation bridge between the clay colloids and collector surfaces via the heavy metal cations. The release of clay colloids was significantly increased upon reduction of solution IS if the Na+ was used to exchange for the Ca2+ or Cd2+ before the IS reduction. Additional experiments showed that the nC60 nanoparticles that were deposited in the presence of Fe3+ and Cu2+ cannot be released by reduction of solution IS. However, the nanoparticle release occurred when the Ca2+ was used to exchange for the Fe3+ and Cu2+. Our work was the first to reveal the influence of heavy metal cations on the irreversibility of colloid attachment, and the findings have important implication to fabrication of functional nanomaterials for stabilization of heavy metals in soil and development of mathematic models for accurate prediction of cotransport of heavy metals and colloids in subsurface environments.

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Effects of solution chemistry on the attachment of graphene oxide onto clay minerals

Abstract: With the increase in production and wide application of graphene oxide (GO), colloidal GO particles are expectantly released into soil and groundwater, where a large number of mineral particles exist.

Cited by 17 publications

References 45 publications

The Effects of Graphene-Family Nanomaterials on Plant Growth: A Review

The Effects of Graphene-Family Nanomaterials on Plant Growth: A Review

Híbridos de grafeno/montmorillonita e óxido de grafeno/montmorillonita como nanomateriais funcionais: uma visão da literatura atual

Impact of heavy metal cations on deposition and release of clay colloids in saturated porous media

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