Green synthesis of sulfur nanoparticles and evaluation of their catalytic detoxification of hexavalent chromium in water

Tripathi, Ravi Mani; Rao, R. Pragadeeshwara; Tsuzuki, Takuya

doi:10.1039/c8ra07845a

Cited by 76 publications

(62 citation statements)

References 43 publications

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“…However, after doping them with palladium their catalytic property enhanced many fold suggesting palladium increased catalytic potency of iron and TiO 2 . More notably, the Cr (VI) reduction obtained for GSE-PdNPs is far higher as compared to the previous studies (Table 2) [2,11,12,19,[45][46][47][48][49][50][51][52][53][54][55].…”

Section: Varying Initial Concentration Of Chromiummentioning

confidence: 54%

Green mediated synthesis of palladium nanoparticles using aqueous leaf extract of Gymnema sylvestre for catalytic reduction of Cr (VI)

Kadam¹,

Madiwale²,

Bashte³

et al. 2020

SN Appl. Sci.

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Palladium nanoparticles (PdNPs) were synthesised using a microwave technique using Gymnema sylvestre (GSE) leaf extract. PdNPs were tailored to different PdCl 2 and plant extract concentrations. Using XRD the crystalline existence of GSE-PdNPs has been established, confirming the formation of face-centered cubic structure. UV-Vis spectra of PdNPs confirmed the reduction of Pd 2+ to Pd 0. The FTIR spectra indicate the existence of functional groups which are responsible for nanoparticles reduction and progression. The SEM discloses quasi-sphere nanoparticles without agglomeration or aggregation which TEM confirms further. The reduction of Cr (VI) was performed with PdNPs (10 mg/L) and achieved a reduction of 96% within 30 min. In order to investigate the efficient reduction of chromium from Cr (VI) to Cr (III), different reaction system parameters have been optimised.

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Section: Varying Initial Concentration Of Chromiummentioning

confidence: 54%

Green mediated synthesis of palladium nanoparticles using aqueous leaf extract of Gymnema sylvestre for catalytic reduction of Cr (VI)

Kadam¹,

Madiwale²,

Bashte³

et al. 2020

SN Appl. Sci.

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“…Photocatalytic reduction of Cr(VI) into Cr(III) is one of effective approaches frequently chosen for Cr(VI) pollution deep elimination owing to nontoxicity, less sludge as well as environmental friendliness. 37 These as-synthesized niobate/diatomite materials are used for photocatalytic conversion of Cr(VI) into Cr(III) with the assistance of oxalic acid under light illumination. High photocatalytic performance is rst conrmed by visual observation of peak intensity weakening within the reaction of 12 min ( Fig.…”

Section: Resultsmentioning

confidence: 99%

A general route to modify diatomite with niobates for versatile applications of heavy metal removal

et al. 2019

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A general solution-phase strategy is developed to synthesize nanostructure niobates such as MnNb 2 O 6 , SnNb 2 O 6 and ZnNb 2 O 6 on natural mineral diatomite for water environmental remediation. (NH 4 ) 2 C 2 O 4 aqueous solution is the key to achieve a scalable and controllable synthesis of niobate/diatomite hybrid systems, which generates NH 3 $H 2 O for surface etching activation of diatomite, and H 2 C 2 O 4 for complexation dissolution of Nb 2 O 5 , enabling the heterogeneous crystallization process to proceed with controllable growth kinetics. First principle calculations indicate that both niobium atom and niobiumoxygen species have the lowest adsorption energy on SiO 2 surface, and then induce the nucleating process of Nb-O-Mn (or Zn, Sn) networks. Cr(VI), Fe(III), and Pb(II) ions are taken as target pollutants to evaluate the water-cleaning ability of the niobate-modified diatomite. Possible mechanisms for the photoreduction of Cr(VI), physical adsorption of Fe(OH) 3 colloids, and chemisorption of Pb(II) ions are proposed on the basis of experimentally investigations. The possibility of combining the advantages of natural mineral diatomite and nanostructured niobates provides a highly robust and potential material system with versatile functionalities of heavy metal ion removal, demonstrating great promise for a wide range of water purification.

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“…Hence, researchers have focused on facile, cost-effective, nontoxic, environmentally friendly, green chemistry methods for synthesizing NPs. Nowadays, researchers have been adopting biological routes for the synthesis of nanomaterials using fungal [1,7,8] and bacterial [9] biomasses as well as plant extracts [10][11][12]. Of these biomaterials, plant extracts have gained the attention of researchers over bacterial and fungal biomasses.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Triangular and Hexagonal Anionic Gold Nanoparticles and Evaluation of Their Cytotoxicity

et al. 2019

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Comprehension of the shape-dependent properties of gold nanoparticles (AuNPs) could benefit the advancements in cellular uptake efficiency. Spherical AuNPs have generally been used for drug delivery, and recent research has indicated that the cellular uptake of triangular AuNPs was higher than that of spherical ones. Previous reports have also revealed that chemically synthesized AuNPs were cytotoxic. Therefore, we have developed a facile, cost-effective, and environmentally friendly method for synthesizing triangular and hexagonal anionic AuNPs. The zeta potential of the synthesized AuNPs was negative, which indicated that their surface could be easily functionalized with positively charged molecules to upload drugs or biomolecules. Transmission electron microscopy (TEM) images illustrated that the largest particle size of the synthesized quasi-hexagonal AuNPs was 61 nm. The TEM images also illustrated that two types of equilateral-triangular AuNPs were synthesized: One featured sharp and the other rounded corners. The sides of the smallest and largest triangular AuNPs were 23 and 178 nm, respectively. Energy-dispersive X-ray spectra of the green-synthesized AuNPs indicated that they consisted entirely of elemental Au. The cytotoxicity of the green-synthesized AuNPs was evaluated using 3T3-L1 adipocytes. Using cell viability data, we determined that the green-synthesized AuNPs did not exhibit any cytotoxic effects on 3T3-L1 adipocytes.

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Green synthesis of sulfur nanoparticles and evaluation of their catalytic detoxification of hexavalent chromium in water

Abstract: Biosynthesized sulphur nanoparticles showed high efficiency in the reduction of Cr(vi) even at a small catalyst/Cr(vi) ratio.

Cited by 76 publications

References 43 publications

Green mediated synthesis of palladium nanoparticles using aqueous leaf extract of Gymnema sylvestre for catalytic reduction of Cr (VI)

Green mediated synthesis of palladium nanoparticles using aqueous leaf extract of Gymnema sylvestre for catalytic reduction of Cr (VI)

A general route to modify diatomite with niobates for versatile applications of heavy metal removal

Facile Synthesis of Triangular and Hexagonal Anionic Gold Nanoparticles and Evaluation of Their Cytotoxicity

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