Nanoclays as Eco-friendly Adsorbents of Arsenic for Water Purification

Baigorria, Estefanía; Cano, Leonardo; Álvarez, Vera A.

doi:10.1007/978-3-030-11155-7_61-1

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…The flocculation of Lap by CTAB is immediately visible by increased opacity and turbidity of the dispersion. Assuming a CEC of Lap in a range of 0.55–0.8 mequiv/g, there is 1.25 times excess of CTA + cations over the total exchangeable cations, allowing complete pillaring of Lap. After 10 min of stirring, a previously prepared solution of Na 2 MoO 4 (3 mg/mL) and Bi(NO 3 ) 3 (10 mg/mL) was added to the dispersion to reach final Bi concentrations of 0.25, 0.5, 1, 2.5, 5, or 10 mM, always keeping the Bi:Mo precursor ratio constant.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…With the dominance of {100} facets emerged greatly enhanced adsorption kinetics and the capacity to adsorb both cationic and anionic dyes. Interestingly, their adsorption capacity surpasses that of pillared Lap (clays), which are known to be effective sorbents of various molecules and ions. ,, The photocatalytic activity and sedimentation of these particles (laden with dye molecules) provide a facile means to reuse and recover these particles. Furthermore, the size of these {100} faceted particles can be tailored by controlling the pH of the precursor dispersion.…”

Section: Introductionmentioning

confidence: 99%

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Facet Engineering of Bismuth Molybdate via Confined Growth in a Nanoscale Template toward Water Remediation

Jatav¹,

Liu²,

Herber³

et al. 2021

ACS Appl. Mater. Interfaces

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Certain nanomaterials can filter and alter unwanted compounds due to a high surface area, surface reactivity, and microporous structure. Herein, γ-Bi2MoO6 particles are synthesized via a colloidal hydrothermal approach using organically modified Laponite as a template. This organically modified Laponite interlayer serves as a template promoting the growth of the bismuth molybdate crystals in the [010] direction to result in hybrid Laponite–Bi2MoO6 particles terminating predominantly in the {100} crystal facets. This resulted in an increase in particle size from lateral dimensions of <100 nm to micron scale and superior adsorption capacity compared to bismuth molybdate nanoparticles. These {100}-facet terminated particles can load both cationic and anionic dyes on their surfaces near-spontaneously and retain the photocatalytic properties of Bi2MoO6. Furthermore, dye-laden hybrid particles quickly sediment, rendering the task of particle recovery trivial. The adsorption of dyes is completed within minutes, and near-complete photocatalytic degradation of the adsorbed dye in visible light allowed recycling of these particles for multiple cycles of water decontamination. Their adsorption capacity, facile synthesis, good recycling performance, and increased product yield compared to pure bismuth molybdate make them promising materials for environmental remediation. Furthermore, this synthetic approach could be exploited for facet engineering in other Aurivillius-type perovskites and potentially other materials.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facet Engineering of Bismuth Molybdate via Confined Growth in a Nanoscale Template toward Water Remediation

Jatav¹,

Liu²,

Herber³

et al. 2021

ACS Appl. Mater. Interfaces

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Biopolymer‐Nanocomposite Hybrid Materials as Potential Strategy to Remove Pesticides in Water: Occurrence and Perspectives

Baigorria

Fraceto

2021

Advanced Sustainable Systems

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Nations (FAO) estimates that approximately 40% of food crops are lost each year to plant pests and diseases. [2] These losses result in a shortfall in crop yields for sufficient food production, causing significant economic consequences. [1,2] Over the years, various anthropogenic activities, together with climate change, have led to alterations in ecosystems that cause considerable damage in areas such as agriculture. The reduction in biodiversity and the creation of new niches are some of these effects that allow, among other things, the rapid spread of pests. [1,2] Therefore, plant protection in agricultural crops is crucial for avoiding the impacts caused by devastating pests and diseases.Agricultural activities face the dual challenges of, on the one hand, becoming more productive and, on the other hand, reducing their impacts on the environment as much as possible. In the case of the former, the use of chemical products such as pesticides is often essential for the control of crop diseases and pests, [2][3][4] improving crop yields and providing greater food security for society. However, although the use of pesticides brings important benefits, including reduced crop damage and, consequently, increased food quality and quantity, these substances have detrimental effects on the environment. [5][6][7] One of the negative effects of the use of chemical pesticides in agricultural systems is the impact on water resources, [1,7] depending on factors including the nature of the compound used, the mode of application, and climatic variations. [1,7] The low degradability of pesticides enables them to accumulate in the soil or to be transported to surface water and groundwater, causing further environmental damage. Although the soil is the main receptor medium for these chemicals, water resources including rivers, streams, lakes, and groundwater are highly susceptible to contamination, due to the interconnection between water bodies and soil. The persistence of these compounds resulting from agricultural practices in hydrographic basins is a threat to human health. [1,4,7] Contamination of groundwater by pesticides and their residues is recognized as a problem in both advanced and developing countries. [2,8] Consequently, the scientific community faces a continuous challenge to develop suitable materials, together with new and more efficient technologies, for the

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Facile synthesis of ZnO/Hal nanocomposite for arsenite (As(III)) removal from aqueous media

Khoddam,

Norouzbeigi,

Velayi

et al. 2023

Sci Rep

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Arsenite (As(III)) is the most toxic form of arsenic that is a serious concern for water contamination worldwide. Herein a ZnO/Halloysite (Hal) nanocomposite was prepared by the chemical bath deposition method (CBD) through seed-mediated ZnO growth on the halloysite for eliminating As(III) from the aqueous solution. The growth of ZnO on seeded halloysite was investigated based on the HMTA: Zn2+ molar ratio in the solution. An optimum molar ratio of HMTA:Zn for nucleation and growth of ZnO upon halloysite was obtained 1:2 based on morphological analysis. The TGA results confirmed that thermal stability of HNT was enhanced by ZnO decoration. The prepared ZnO/Hal nanocomposite at optimal conditions was employed for arsenite (As(III)) removal from aqueous solutions. Experimental data were evaluated with different isothermal, thermodynamic, and kinetic models. Based on the zeta potential results, Hal nanocomposites had a greater negative value than pure Hal. Therefore, the ZnO/Hal nanocomposite exhibited efficient As(III) adsorption with a removal efficiency of 76% compared to pure Hal with a removal efficiency of 5%. Adsorption isotherm was well correlated by both non-linear Langmuir and Sips models, exhibiting maximum adsorption capacity of As(III) at 42.07 mg/g, and 42.5 mg/g, respectively. As a result of the study, it was found that the fabricated Hal nanocomposite with low toxicity can be used effectively in water treatment.

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Nanoclays as Eco-friendly Adsorbents of Arsenic for Water Purification

Cited by 4 publications

References 42 publications

Facet Engineering of Bismuth Molybdate via Confined Growth in a Nanoscale Template toward Water Remediation

Facet Engineering of Bismuth Molybdate via Confined Growth in a Nanoscale Template toward Water Remediation

Biopolymer‐Nanocomposite Hybrid Materials as Potential Strategy to Remove Pesticides in Water: Occurrence and Perspectives

Facile synthesis of ZnO/Hal nanocomposite for arsenite (As(III)) removal from aqueous media

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