Sains Malaysiana 49(7)(2020): 1585-1596

http://dx.doi.org/10.17576/jsm-2020-4907-11

Kinetic, Isotherm, and Possible Mechanism of Pb(II) Ion Adsorption onto Xanthated Neem (Azadirachta indica) Leaf Powder

(Kinetik, Isoterma dan Mekanisme Kemungkinan Penjerapan Ion Pb(II) ke atas Serbuk Daun Mambu (Azadirachta indica) Terxantat)

MARDHIAH ISMAIL^1,2* & MEGAT AHMAD KAMAL MEGAT HANAFIAH¹

¹Faculty of Applied Science, Universiti Teknologi MARA, 40450 Shah Alam, Selangor Darul Ehsan, Malaysia

²Faculty of Applied Science, Universiti Teknologi MARA, 26400 Jengka, Pahang Darul Makmur, Malaysia

Diserahkan: 2 Ogos 2019/Diterima: 6 Mac 2020

ABSTRACT

Adsorption capacity is one of the concern parameters in synthesizing an adsorbent for wastewater treatment. In this research, a bio-sorbent prepared by treating neem leaf powder with a chelating agent; carbon di-sulphide (CS₂) through xanthation reaction was synthesized. The effect of treating with ligand (CS₂) will be investigate since ligand will bind to metal ion. Ligand or chelating agent can help in increasing the ability of adsorbent to bind a metal ion in an aqueous solution. The chemistry of adsorption of Pb(II) ion on xanthated neem leaf powder (XNL) was investigated by using batch adsorption study. The maximum adsorption capacity, 256.41 mg g^-1 at 318 K was determined from isotherm study, obtained from Langmuir model. FTIR spectroscopy suggested that the adsorption of Pb(II) onto XNL could possibly occur through ion exchange, Van der Wall forces and ionic interaction.

Keywords: Adsorption; isotherm; mechanisms; neem leaf; xanthate

ABSTRAK

Kapasiti penjerapan adalah salah satu parameter yang menjadi penentu dalam menghasilkan penjerap bagi merawat air buangan. Dalam kajian ini, bio-penjerap yang dihasilkan dengan merawat serbuk daun mambu dengan karbon disulfida (CS₂) melalui tindak balas xantatasi. Proses penjerapan ion Pb(II) oleh daun mambu xantat (XNL) telah dikaji menggunakan kajian penjerapan berperingkat. Kadar penjerapan maksimum ialah 256.41 mg g^-1 diperoleh melalui kajian isoterma dengan menggunakan model Langmuir. Kajian spektroskopi FTIR mendapati penjerapan Pb(II) ke XNL berkemungkinan berlaku melalui pertukaran ion, ikatan Van der Wall dan interaksi ion.

Kata kunci: Daun mambu; isoterma; mekanisme; penjerapan; xantat

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*Pengarang untuk surat-menyurat; email: marismael@uitm.edu.my