Sains Malaysiana 45(7)(2016): 1155–1167

 

Lead Adsorption Behaviours on Nanoscale Zero Valent Irons (nZVI) Coupled with Rice Husk MCM-41

(Kelakuan Penjerapan Plumbum ke atas Besi Bervalensi Sifar pada Skala Nano (nZVI) Berganding dengan Sekam Padi MCM-41)

 

C. KAEWBUDDEE1,2,3, P. CHANPIWAT4, P. KIDKHUNTHOD5 & K. WANTALA1,2,3*

 

1Department of Chemical Engineering, Faculty of Engineering, Khon Kaen University

Khon Kaen 40002, Thailand

 

2Chemical Kinetics and Applied Catalysis Laboratory (CKCL), Faculty of Engineering,

Khon Kaen University, Khon Kaen 40002, Thailand

 

3Research Center for Environmental and Hazardous Substance Management (EHSM)

Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand

 

4Environmental Research Institute, Chulalongkorn University, Bangkok 10330, Thailand

 

5Synchrotron Light Research Institute, Nakhon Ratchasima, 30000, Thailand

 

 

Diserahkan: 02 November 2015/Diterima: 23 Januari 2016

 

ABSTRACT

The aims of this work were to investigate the characteristics of nanoscale zero valent irons (nZVI) coupled with mesoporous materials (RH-MCM-41) adsorbent and to study the removal mechanisms of Pb (II) from synthetical solutions using full pictorial design batch experiments. Synthetic nZVI coupled with RH MCM-41 as Pb (II) adsorbent were characterized by XRD, TEM, BET and XANES. The results of XANES analyses confirmed the ability of RH-MCM-41 to prevent oxidations of Fe0 to Fe2+ and Fe3+. XANES results also verified the oxidation states of Pb (II). The solution pH was the most significant positive effect in controlling Pb (II) adsorption. The equilibrium and kinetic adsorption isotherms well fitted with the Langmuir isotherm. The pseudo-second order kinetic adsorption indicated that the adsorption process is the rate limiting step for Pb (II) removal. Furthermore, Langmuir-Hinshelwood confirmed the obvious Pb (II) adsorption at the active site of adsorbents. The reduction rate constant (kr = 5,000 mg/L.min) was higher than the adsorption rate constant (Kad = 0.0002 L/mg). Regarding the research results, four pathways including: reduction process, adsorption on FeOOH, adsorption on RH-MCM-41 and complex reaction between Fe and Pb ions were suggested for Pb (II) removal by nZVI coupled with RH-MCM-41.

 

Keywords: Adsorption mechanism; mesoporous material; nanoscale zero valent irons; Pb; XANES

 

ABSTRAK

Penyelidikan ini bertujuan untuk mengkaji ciri besi bervalensi sifar pada skala nano (nZVI) berganding dengan penjerap bahan mesoporous (RH-MCM-41) dan mengkaji mekanisme penyingkiran Pb (II) daripada larutan sistetik menggunakan uji kaji reka bentuk kelompok gambar penuh. Gabungan penjerap sintetik nZVI dengan RH MCM-41 sebagai Pb (II) telah dicirikan oleh XRD, TEM, BET dan XANES. Keputusan analisis XANES mengesahkan keupayaan RH-MCM-41 untuk mengelakkan pengoksidaan Fe0 kepada Fe2+ dan Fe3+. Keputusan XANES ini juga mengesahkan keadaan pengoksidaan Pb (II). Larutan PH adalah kesan positif yang paling penting dalam mengawal penjerapan Pb (II). Penjerapan isoterma keseimbangan dan kinetik juga sepadan dengan isoterma Langmuir. Penjerapan kinetik tertib pseudo-kedua menunjukkan bahawa proses penjerapan adalah langkah untuk mengehadkan kadar penyingkiran Pb (II). Tambahan pula, Langmuir-Hinshelwood mengesahkan penjerapan pasti Pb (II) di tapak bahan penjerap aktif. Kadar pengurangan berterusan (kr = 5000 mg/L.min) adalah lebih tinggi daripada kadar penjerapan pemalar (Kad = 0.0002 L/mg). Mengenai hasil penyelidikan, empat laluan termasuk: proses pengurangan, penjerapan pada FeOOH, penjerapan pada RH-MCM-41 dan tindak balas kompleks antara ion Fe dan Pb dicadangkan untuk penyingkiran Pb (II) oleh nZVI berganding dengan RH-MCM-41.

 

Kata kunci: Bahan mesoporos; besi bervalensi sifar pada skala nano; mekanisme penjerapan; Pb; XANES

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*Pengarang untuk surat-menyurat; email: kitirote@kku.ac.th

 

 

 
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