Controlled release formulation of zinc hydroxide nitrate intercalated with sodium dodecylsulphate and bispyribac anions: A novel herbicide nanocomposite for paddy cultivation

Sharif, Sharifah Norain Mohd; Hashim, Norhayati; Isa, Illyas Md; Bakar, Suriani Abu; Saidin, Mohamad Idris; Ahmad, Mohamad Ali; Mamat, Mazidah; Hussein, Mohd Zobir

doi:10.1016/j.arabjc.2019.09.006

Cited by 12 publications

(12 citation statements)

References 45 publications

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“…The ZHN-SDS-BP was synthesised by dispersing 0.3 g ZHN-SDS into 50 mL of 2.5 mmol BP solution and stirred for 2 h. The mixture obtained was also aged (at 70 °C for 24 h), collected by centrifuges (at 4000 rpm for 5 min), and dried in the oven. The results on the characterisation studies of both ZHN-SDS and ZHN-SDS-BP have been reported in our previously published paper, and the percentage loading of BP intercalated in the interlayer gallery of ZHN-SDS-BP was found to be 61.34% (Sharif et al 2019). The ZHN-SDS-BP was coated with chitosan at a mass ratio of 1:1.…”

Section: Synthesis Of Zhn-sds-bp Zhn-sds-chi and Zhn-sds-bp-chi Nanocompositesmentioning

confidence: 57%

“…This study is an extension of our recent paper which reported on the synthesis of zinc hydroxide nitrate-sodium dodecylsulphate-bispyribac (ZHN-SDS-BP) (Sharif et al 2019). Our previous paper has revealed that ZHN is a promising host material in implementing the slow release of bispyribac (BP) herbicide.…”

Section: Introductionmentioning

confidence: 79%

“…ZHN-SDS and ZHN-SDS-BP were synthesised using ZHN, Zn 5 (OH) 8 (NO 3 ) 2 •2H 2 O via co-precipitation method as previously reported (Sharif et al 2019). The ZHN-SDS was prepared by reacting 40 mL of 20 mmol Zn(NO 3 ) 2 •6H 2 O and 40 mL of 10 mmol SDS, under pH controlled environment (pH 6.5) and continuous flow of nitrogen.…”

Section: Synthesis Of Zhn-sds-bp Zhn-sds-chi and Zhn-sds-bp-chi Nanocompositesmentioning

confidence: 99%

“…Before undergoing the chitosan-coating process, both ZHN-SDS and ZHN-SDS-BP were also demonstrate a typical flake-like layered structure. ZHN-SDS possesses a flake-like structure with sharp edges, whereas ZHN-SDS-BP has a flake-like structure with more rounded edges (Sharif et al 2019). The chitosan-coating process allows chitosan to be distributed on the surface of the ZHN-SDS and ZHN-SDS-BP; hence, causing the smooth and flat surface of the ZHN-SDS and ZHN-SDS-BP to become rough and uneven, which resembles the morphology of the chitosan.…”

Section: Surface Morphology Analysismentioning

confidence: 99%

“…Therefore, this section will discuss in detail any changes observed in the interlayer gallery of the ZHN-SDS-BP nanocomposite after the chitosancoating process. Before the ZHN-SDS-BP nanocomposite was coated with chitosan, the SDS and BP that were intercalated in the interlayer gallery of the nanocomposite were proposed to be arranged in a monolayer (Sharif et al 2019). The basal spacing of the intercalation peak is 28.6 Å, and hence, after considering the deduction that comes from the thickness of the ZHN layer and Zn tetrahedron, the height of the interlayer gallery of ZHN-SDS-BP is calculated to be 18.6 Å.…”

Section: Spatial Arrangement Of Chitosan-coated Zhn-sds-bp Nanocompositementioning

confidence: 99%

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Chitosan as a coating material in enhancing the controlled release behaviour of zinc hydroxide nitrate–sodium dodecylsulphate–bispyribac nanocomposite

et al. 2020

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The aim of this study is to modulate the controlled release properties of zinc hydroxide nitrate-sodium dodecylsulphatebispyribac (ZHN-SDS-BP) nanocomposite, by coating the nanocomposite using chitosan. This study was conducted as part of an effort to reduce the environmental problems caused by the over-use of pesticides. The characterisation study shows that chitosan had been successfully coated onto the outer surface of the ZHN-SDS-BP (BP concentration of 0.05 M) without changing the types of ions intercalated in its interlayer gallery. The chitosan-coated nanocomposite, ZHN-SDS-BP-Chi also possesses a better thermal stability compared to the uncoated nanocomposite. Owing to the polycationic, hygroscopic nature, and gelation ability of chitosan, the chitosan coating was found to significantly prolong the release of bispyribac. The ZHN-SDS-BP-Chi showed a better performance in releasing pesticides, with prolonged release time ranging from 462 to 5349 min, compared to 74 to 4117 min for the uncoated nanocomposites. The release kinetic studies reveal that the release of bispyribac from the ZHN-SDS-BP-Chi is controlled by a pseudo-second-order kinetic model, thus signifying that the release mechanism is via dissolution and ion-exchange processes. The potential of chitosan in slowing the release of BP from ZHN-SDS-BP-Chi will hopefully contribute to minimise the risk of pollution resulting from the excessive use of pesticides.

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Section: Synthesis Of Zhn-sds-bp Zhn-sds-chi and Zhn-sds-bp-chi Nanocompositesmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 79%

Section: Synthesis Of Zhn-sds-bp Zhn-sds-chi and Zhn-sds-bp-chi Nanocompositesmentioning

confidence: 99%

Section: Surface Morphology Analysismentioning

confidence: 99%

Section: Spatial Arrangement Of Chitosan-coated Zhn-sds-bp Nanocompositementioning

confidence: 99%

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