Malaysian Journal of Analytical Sciences Vol 21 No 6 (2017): 1276 - 1288

DOI: 10.17576/mjas-2017-2106-09

 

 

 

SINTESIS MnO₂ NANOBUNGA POROS MENGGUNAKAN TEMPLAT SILIKA-APTES

 

(Synthesis of Porous MnO₂ Nanoflower using Silica-APTES Template)

 

Siti Zubaidah Hasan¹, Mohamed Rozali Othman^1,2*, Muhammad Rahimi Yusop¹

 

¹Pusat Pengajian Sains Kimia dan Teknologi Makanan

²Pusat Penyelidikan Air dan Analisis

Fakulti Sains dan Teknologi,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

 

*Pengarang utama:  rozali@ukm.edu.my

 

 

Received: 19 May 2017; Accepted: 20 September 2017

 

 

Abstrak

Tujuan kajian ini dilakukan adalah untuk menyediakan MnO₂ poros nano yang mempunyai bentuk nanobunga untuk digunakan sebagai penjerap pewarna sintetik komersial (remazol merah, eriokrom hitam dan metilena biru). Permukaan bahan silika yang telah diubahsuai dengan 3-aminopropil trietoksisilana (APTES) digunakan dalam proses sonokimia pada suhu bilik dengan kehadiran 0.1M KMnO₄ untuk menghasilkan komposit silika-MnO₂ dan seterusnya MnO₂ bersaiz nano selepas proses penyingkiran templat dilakukan. Spektrum FTIR menunjukkan kehadiran getaran MnO₂ dalam julat 400 – 600 cm^-1. Analisis jerap-nyahjerap N₂ menunjukkan MnO₂ tulen memiliki liang yang bersifat mesoporos 51.9 Å (± 1.4), manakala luas permukaan MnO₂ ialah 123.6 m²/g. Penjerap MnO₂ nanobunga yang diperolehi menunjukkan kebolehan menjerap pewarna eriokrom hitam dan metilena biru sahaja. Kedua-dua isoterma penjerapan eriokrom hitam dan metilena biru oleh MnO₂ menepati ciri-ciri model Langmuir.

 

Kata kunci:  sonokimia, logam oksida, jerapan

 

Abstract

The aim of this study is to prepare porous MnO₂ nanoflower to be used as an adsorbent for commercial synthetic dyes (remazol red, eriochrome black and methylene blue). The modified surface of the silica with 3-aminopropyl triethoxysilane (APTES) was used in sonochemical process at room temperature in the presence of 0.1M KMnO₄ to produce composite silica-MnO₂ and later nano-MnO₂ after removal of the template. FTIR spectra indicate the presence of MnO₂ vibration in the range of 400 – 600 cm^-1. N₂ sorption-desorption analysis showed pure MnO₂ is mesopores with the value of 51.9 Å (± 1.4), while the MnO₂ surface area is 123.6 m²/g. MnO₂ nanoflower adsorbent obtained demonstrate the ability to adsorb dye eriochrome black and methylene blue only. Both adsorption isotherms of eriochrome black and methylene blue by MnO₂ meet the characteristics of Langmuir model.

 

Keywords:  sonochemical, metal oxides, adsorption

 

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