Polymeric Nanocomposite-Based Herbicide of Carboxymethyl Cellulose Coated-Zinc/Aluminium Layered Double Hydroxide-Quinclorac: A Controlled Release Purpose for Agrochemicals

• Published in: Journal of polymers and the environment Vol. 29; no. 6; pp. 1817 - 1834
• Main Authors: Sharif, Sharifah Norain Mohd, Hashim, Norhayati, Isa, Illyas Md, Bakar, Suriani Abu, Saidin, Mohamad Idris, Ahmad, Mohamad Syahrizal, Mamat, Mazidah, Hussein, Mohd Zobir, Zainul, Rahadian
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.06.2021; Springer Nature B.V
• Subjects: Agrochemicals; Aluminum; Aqueous solutions; Carboxymethyl cellulose; Carboxymethylcellulose; Cellulose; Chemistry; Chemistry and Materials Science; Controlled release; Emission analysis; Environmental Chemistry; Environmental conditions; Environmental Engineering/Biotechnology; Field emission microscopy; Fourier analysis; Fourier transforms; Herbicides; Hydroxides; Industrial Chemistry/Chemical Engineering; Infrared analysis; Infrared spectroscopy; Ion exchange; Materials Science; Nanocomposites; Original Paper; Polymer Sciences; Scanning electron microscopy; Sodium chloride; Sodium phosphate; Sodium sulfate; Thermogravimetric analysis; Trisodium phosphate; X ray powder diffraction; X-ray diffraction; Zinc; Zinc coatings; Carboxymethyl cellulose; Controlled release formulation; Coating; Kinetic; Zinc/aluminium layered double hydroxide-quinclorac
• ISSN: 1566-2543; 1572-8919
• DOI: 10.1007/s10924-020-01997-0

In this work, the use of carboxymethyl cellulose (CMC) is highlighted in enhancing the controlled release behaviour of zinc/aluminium layered double hydroxide-quinclorac (Zn/Al-LDH-QC). The Zn/Al-LDH-QC-CMC nanocomposite were characterised using powder x-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric and derivative thermogravimetric analysis and field emission scanning electron microscopy. The release study was carried out in an aqueous solution of Na 3 PO 4 , Na 2 SO 4 and NaCl, so as to mimic the environmental condition where the QC is frequently used. The Zn/Al-LDH-QC-CMC nanocomposites showed better performance in releasing QC, with prolonged release time ranging from 163–6083 min, compared to 99–2639 min for the uncoated nanocomposites. The hygroscopic nature of the CMC play a critical role in enhancing the release behaviour of the Zn/Al-LDH-QC-CMC. The kinetic study shows that the Zn/Al-LDH-QC-CMC follows the pseudo-second order kinetic model; hence the release mechanism occurred via dissolution of the CMC matrix and the ion exchange process. These results, therefore, indicate the potential of Zn/Al-LDH-QC-CMC in dealing with the downside effect of the excessive usage of herbicide in paddy cultivation. Graphic abstract