Efficient system for encapsulation and removal of paraquat and diquat from aqueous solution: 4-Sulfonatocalix[n]arenes and its magnetite modified nanomaterials

Kumari, Pratibha; Kumar, Sanjay; Nisa, Kharu; Sharma, Devinder

doi:10.1016/j.jece.2019.103130

Cited by 27 publications

(8 citation statements)

References 63 publications

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“…These changes are ascribed to the initial availability of a large number of free adsorption sites on the adsorbent surface and thereafter, the availability of fewer vacant sites may be responsible for the slow increment in the current conditions. Similar trends were reported previously (Kumari et al, 2019). Moreover, to obtain the information regarding the adsorption process relating to chemical reactions, mass transfer, and the adsorption order, pseudo-first-order and pseudo-second-order models were employed (Junthip et al, 2019).…”

Section: Effect Of Contact Time On the Removal Of Paraquat And Diquat Using Bs And Bs1000mentioning

confidence: 85%

“…The adsorption isotherm models are represented through mathematical expression (Kumari et al, 2019). The relationship between herbicides and tested adsorbent in the aqueous phase can be described with the help of these two models.…”

Section: Effect Of Contact Time On the Removal Of Paraquat And Diquat Using Bs And Bs1000mentioning

confidence: 99%

“…The use of pesticides in agricultural fields is very important as they are a useful means of reducing production efforts and increasing agricultural productivity (Junthip et al, 2019). Paraquat and diquat are widely used and classified as non-selective contact viologen herbicides that kill plant tissue on contact (Kumari et al, 2019). Moreover, pesticides such as paraquat and diquat are sometimes consumed to commit suicide owing to their characteristics (Seok et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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In vitro removal of paraquat and diquat from aqueous media using raw and calcined basil seed

Uematsu¹,

Ogata²,

Nagai³

et al. 2021

Heliyon

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Section: Effect Of Contact Time On the Removal Of Paraquat And Diquat Using Bs And Bs1000mentioning

confidence: 85%

Section: Effect Of Contact Time On the Removal Of Paraquat And Diquat Using Bs And Bs1000mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In vitro removal of paraquat and diquat from aqueous media using raw and calcined basil seed

Uematsu¹,

Ogata²,

Nagai³

et al. 2021

Heliyon

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show abstract

“…In fact, such an unfavorable electron transfer process is completely different from the aforementioned electron‐transfer reactions in the photosynthesis, photocatalytic, and enzyme‐mediated biochemical redox of paraquat. [ 1–23 ]…”

Section: Resultsmentioning

confidence: 99%

“…[ 3–5 ] Various techniques for the removal of PQ from the aqueous solution, for instance, adsorption or immobilization on clay minerals, membrane filtration, ozonation and photocatalytic processes, Fenton's reaction, electrochemical procedures, and encapsulation by polycalix[n]arenes, have been studied extensively. [ 6–16 ]…”

Section: Introductionmentioning

confidence: 99%

Solvent‐dependent mechanistic aspects for the redox reaction of paraquat in basic solution

Hou

Wang

2021

Int J of Quantum Chemistry

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Detailed mechanisms for the redox cycling of paraquat in basic solutions have been revealed computationally. The reduction of paraquat dication (PQ2+) undergoes via the successive additions with two hydroxide (OH−) anions to form the neutralized intermediates, which can decompose to generate the cation radical (PQ+) by releasing either OH or the hydrated O− radical. PQ+ is neutralized by one OH−, converting molecular oxygen into superoxide (O2−) anion to regenerate PQ2+. The reduction of PQ2+ by OH− is an energy‐directive process whereas the oxidation of PQ+ prefers an entropy‐driving path in which OH− acts as a catalyst. It is found that the Gibbs free‐energy reaction paths are strongly solvent dependent. The redox cycle is energetically preferable in the solvents with low dielectric constants. The yellow‐blue‐transparent color‐changing sequence in the clock reaction of paraquat has been understood by means of the electronic absorption spectra of the cations and the neutral intermediates. Atomic radical anion O− is predicted besides the known OH and O2− radicals to stimulate experimental studies on the redox chemistry of paraquat.

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Effective Removal of Nitrogenous Pesticides from Water Using Functionalized Calix[4]arene‐Decorated Magnetite Nanoparticles

et al. 2023

Self Cite

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An effective nano-adsorbent has been synthesized by the modification of magnetite nanoparticles with ionic-liquid modified calix[4]arene through covalent linkage. This nanocomposite was used for the removal of amino-functionalized nitrogenous pesticides, metribuzin (MET), and dicloran (DIC) from an aqueous solution through adsorption. The adsorption studies showed that the synthesized nanomaterial was effective in removing these pollutants from an aqueous solution. The maximum adsorption capacity for MET and DIC were 5.88 and 1.94 mg g À 1 , respectively. The effect of various factors, such as dosage, pH, and temperature, were studied on the adsorptive removal of MET and DIC. The adsorption was observed to follow Freundlich isotherm and pseudo-second-order kinetics for MET and DIC. The nano-adsorbent was stable and reusable even after the third cycle. The present studies will lead to the development of an ultimate tool for attempting to the problem of water pollution.

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Efficient system for encapsulation and removal of paraquat and diquat from aqueous solution: 4-Sulfonatocalix[n]arenes and its magnetite modified nanomaterials

Cited by 27 publications

References 63 publications

In vitro removal of paraquat and diquat from aqueous media using raw and calcined basil seed

In vitro removal of paraquat and diquat from aqueous media using raw and calcined basil seed

Solvent‐dependent mechanistic aspects for the redox reaction of paraquat in basic solution

Effective Removal of Nitrogenous Pesticides from Water Using Functionalized Calix[4]arene‐Decorated Magnetite Nanoparticles

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