Malaysian Journal of Analytical Sciences, Vol 27 No 5 (2023): 1100 - 1110

 

GRATED COCONUT RESIDUE MODIFIED BY A CATIONIC SURFACTANT FOR REMOVAL OF REACTIVE ORANGE 16 DYE

 

(Sisa Kelapa Parut Diubahsuai oleh Surfaktan Kationik untuk

Menyingkirkan Pewarna Reaktif Oren 16)

 

Nur Zara Syazana Zali1, Shariff Ibrahim2*, Megat Ahmad Kamal Megat Hanafiah3,

and Sabiha Hanim Saleh2

 

1Top Glove Worldwide Sdn. Bhd, 41050 Klang, Selangor, Malaysia

2School of Chemistry and Environment, Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia

3Faculty of Applied Sciences, Universiti Teknologi MARA, 264000 Jengka, Pahang, Malaysia

 

*corresponding author: sha88@uitm.edu.my

 

 

Received: 13 June 2023; Accepted: 17 September 2023; Published:  30 October 2023

 

 

Abstract

Hexadecylpyridinium chloride monohydrate, a cationic surfactant, was employed to chemically modify coconut-grated residue to adsorb reactive orange 16 (RO16). The pH point of zero charge (pHPZC) and surface area were used to characterise the raw coconut grated residue (RGC) and the surfactant-modified grated coconut residue (SMGC). The pHPZC was 5.5, and the Brunauer-Emmett-Teller surface area was 1.86 m2 g-1. The dye solution pH and dose effects on RO16 adsorption were tested in a batch adsorption system. Maximum sorption was seen at an SGMC concentration of 10 g L-1, while optimal adsorption was observed at a low pH. When dye-loaded SGMC was exposed to a basic solution, the desorption percentage increased to almost 70%, whereas low desorption was observed under acidic conditions. Furthermore, the isotherm study discovered that the Freundlich model explained RO16 adsorption of SMGC better than the Langmuir model. The Langmuir isotherm recorded a maximum adsorption capacity of 9.72 mg g-1.

 

Keywords: cationic surfactant, coconut, reactive dye, adsorption

 

Abstract

Heksadekilpiridinium klorida monohidrat, sejenis surfaktan kationik, telah digunakan untuk memodifikasi kimia sisa parut kelapa untuk menjerap reaktif oren 16 (RO16). pH titik cas sifar (pHPZC) dan luas permukaan digunakan untuk pencirian sisa parut kelapa mentah (RGC) dan sisa parut kelapa yang dimodifikasi dengan surfaktan (SMGC). Nilai pHPZC adalah 5.5, dan luas permukaan Brunauer-Emmett-Teller adalah 1.86 m2 g-1. Kesan pH larutan pewarna dan dos terhadap penjerapan RO16 telah diuji dalam sistem penjerapan kelompok. Penjerapan maksimum dilihat pada kepekatan SGMC 10 g L-1, manakala penjerapan optimum diperhatikan pada pH rendah. Apabila SGMC yang memuatkan pewarna terdedah kepada larutan alkali, peratus penjerapan semula meningkat hampir ke 70%, manakala penjerapan rendah diperhatikan dalam keadaan berasid. Selain itu, kajian isoterm menemui bahawa model Freundlich menjelaskan penjerapan RO16 pada SMGC dengan lebih baik daripada model Langmuir. Isoterma Langmuir mencatatkan kapasiti penjerapan maksimum sebanyak 9.72 mg g-1.

 

Kata kunci: surfaktan kationik, kelapa, pewarna reaktif, penjerapan

 

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