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Friday, 19 January 2018
Publication Highlight
Ayu in SEPPUR (2015) PDF Print E-mail
Photodegradation of 2-chlorophenol over colloidal a-FeOOH supported mesostructured silica nanoparticles: Influence of a pore expander  and reaction optimization
R. Jusoh, A.A. Jalil, S. Triwahyono, A. Idris, M.Y. Noordin
Separation and Purification Technology 149 (2015) 55–64
In this work, mesostructured silica nanoparticles (MSN) were modified by the pore expander 3-aminopropyl triethoxysilane (APTES) via the sol–gel method before impregnation with a colloidal a-FeOOH-ionic surfactant (IS-FeOOH) to produce IS-FeOOH/MSNAPTES. Its properties were characterized using X-ray diffraction, Fourier-transform infrared and surface area analysis, and compared with pristine MSN, MSNAPTES and IS-FeOOH/MSNs. The results suggest that IS-FeOOH was located on the outer surface of MSN but in the pores when loaded onto MSNAPTES, while retaining its colloidal structure on both supports. It was found that the photoactivity of the catalysts toward photo-Fenton-like degradation of 2-chlorophenol (2-CP) under visible light irradiation was in the following order: IS-FeOOH/MSN (92.2%) > IS-FeOOH/MSNAPTES (77.6%) > MSNAPTES (38.7%) > MSN (17.5%). The results indicate that the presence of colloidal IS-FeOOH on the outer surface of MSN plays important role in enhancing photoactivity. Photokinetic analysis also supported this result by showing that the surface and bulk reaction was the rate-limiting step for IS-FeOOH/MSN and IS-FeOOH/MSNAPTES, respectively. The operating conditions of 2-CP degradation over IS-FeOOH/MSN were further optimized using response surface methodology. The optimum conditions were found to be 9.09 wt% of IS-FeOOH loading with 0.14 mM H2O2 at pH 5.11 and 49.9 C to give 99.9% of the predicted value of photodegradation.
Fatien in APSUSCI (2015) PDF Print E-mail
New insight into electrochemical-induced synthesis of NiAl2O4/Al2O3:Synergistic effect of surface hydroxyl groups and magnetism forenhanced adsorptivity of Pd(II)
N.F.M. Salleh, A.A. Jalil, S. Triwahyono, J. Efendi, R.R. Mukti, B.H. Hameed
Applied Surface Science 349 (2015) 485–495
A new promising adsorbent, Ni supported on -Al2O3was prepared in a simple electrolysis system(Ni/Al2O3-E) in minutes and was compared with the sample prepared by a physical mixing method(Ni/Al2O3-PM). The adsorbents were characterized by XRD, TEM, FTIR,27Al MAS NMR, XPS, and VSM.The results showed that besides NiO nanoparticles, a NiAl2O4spinel was also formed in Ni/Al2O3-E dur-ing the electrolysis via the dealumination and isomorphous substitution of Ni2+ions. In contrast, onlyagglomerated NiO was found in the Ni/Al2O3-PM. Adsorption test on removal of Pd2+ions from aqueoussolution showed that the Pd2+ions were exchanged with the hydrogen atoms of the surface–OH groups ofboth adsorbents. Significantly, the Ni/Al2O3-E demonstrated a higher adsorption towards Pd2+ions thanNi/Al2O3-PM due to its remarkably higher degree of magnetism, which came from the NiAl2O4. The use of0.1 g L−1Ni/Al2O3-E gave the maximum monolayer adsorption capacity (qm) of 40.3 mg g−1at 303 K andpH 5. The Ni/Al2O3-E showed high potential for simultaneous removal of various noble and transitionmetal ions and could be also used repetitively without affecting the high adsorptivity for Pd2+ions. Thiswork may provide promising adsorbents for recovery of various metals as well as other materials forsuch related applications.
Dayah in RSC Advances (2015) PDF Print E-mail
Acid-vacuo heat treated low cost banana stems fiber for efficient biosorption of Hg(II)†
N. Salamun, S. Triwahyono, A. A. Jalil, T. Matsuura and N. F. M. Salleh
RSC Adv., 2015, 5, 14129
The potential of banana stem fiber (BSF) as a low cost biosorbent for Hg(II) removal was studied. HCl treatment increased the cellulose accessibility which led to an enhanced interaction of Hg(II) and BSF. Activation of BSF-HCl in vacuo at 373 K increased the maximum biosorption capacity from 28 to 372 mg g1 and altered the activation energy from 3.5 to 76.9 kJ mol1 showing an increase in Hg(II) chemisorption. FTIR and ESR results confirmed the large amount of structural defects on the activated BSF-HCl which led to the increase in Hg(II) uptake. Batch biosorption models showed that the kinetics follow pseudo-second-order and the equilibrium uptake fitted to all three-parameter models showing the Hg(II) biosorption behaves as a Langmuir isotherm. The non-linear regression method exhibited higher coefficient of determination values for isotherm and kinetic analyses compared to the linear method. The thermodynamic functions indicated that the nature of Hg(II) biosorption is an exothermic and non-spontaneous process.
Nazirah in RSC Advances (2015) PDF Print E-mail
Elucidation of acid strength effect on ibuprofen adsorption and release by aluminated mesoporous silica nanoparticles†
N. H. N. Kamarudin,a A. A. Jalil,*ab S. Triwahyono,cd M. R. Sazegar,cd S. Hamdan,e S. Babae and A. Ahmadab
RSC Adv., 2015, 5, 30023
Mesoporous silica nanoparticles (MSN) with 1–10 wt% loading of aluminum (Al) were prepared and characterized by XRD, N2 physisorption, 29Si and 27Al NMR, FT-IR and FT-IR preadsorbed pyridine. All samples were evaluated for ibuprofen adsorption and release. The results showed that MSN gave almost complete ibuprofen adsorption while the addition of 1, 5, and 10 wt% Al onto MSN (1Al-MSN, 5Al-MSN and 10Al-MSN) resulted in 35%, 58%, and 79% of adsorption, respectively. The characterization results elucidated that the highest adsorptivity of MSN was due to its highest surface silanol groups, while the increase in Br¨onsted acidity upon loading of Al provided more adsorption sites for the higher activity. Regardless of its highest adsorption capacity, MSN demonstrated the highest and fastest release (100%) in 10 h, followed by 1Al-MSN, 5Al-MSN and 10Al-MSN. The increase in Al loading increased the acid sites that hold the ibuprofen molecules, which raised the retention in ibuprofen release. The pKa of Si–OH–Al that is lower than Si–OH sites also attracted the ibuprofen more strongly, which resulted in the slower release of Al-MSN as compared to MSN. The cytotoxicity study exhibited that ibuprofen loaded Al-MSN was able to reduce the toxicity in the WRL-68 cells, verifying its ability to hold and slow the release of ibuprofen as well as minimize the risk of drug overdose.
Ayu in RSC Advances (2015) PDF Print E-mail
Synthesis of dual type Fe species supported mesostructured silica nanoparticles: synergistical effects in photocatalytic activity†
R. Jusoh,a A. A. Jalil,*ab S. Triwahyonoc and N. H. N. Kamarudina
RSC Adv., 2015, 5, 9727
Dual type Fe species (isomorphously substituted Fe species and a colloidal a-FeOOH (IS-FeOOH)) supported on mesostructured silica nanoparticles (IS-FeOOH/MSN) were prepared by a simple electrochemical method followed by impregnation. Characterization was conducted using X-ray diffraction, transmission electron microscopy, surface area analysis, Fourier-transform infrared spectroscopy, nuclear magnetic resonance, electron spin resonance, and X-ray photoelectron spectroscopy. The results suggested that silica removal occurred in the MSN framework to isomorphously substitute Fe cations while retaining the colloidal structure of IS-FeOOH. The catalytic activity of IS-FeOOH/MSN was tested on photo-Fenton-like degradation of 2-chlorophenol under fluorescent light irradiation. The performance of the catalyst was in the following order: 10 wt% ISFeOOH/MSN > 15 wt% IS-FeOOH/MSN > 5 wt% IS-FeOOH/MSN > MSN, with removal percentages of 92.2, 79.3, 73.1, and 14.2%, respectively. The results suggest that a synergistic effect between the dual type of Fe species (Si–O–Fe and IS-FeOOH colloid) and MSN played important roles in enhancing the degradation. The results provide strong evidence to support the potential use of IS-FeOOH/MSN as a photo-Fenton-like nanocatalyst for organic pollutants treatment.
Munirah in RSC Advances (2015) PDF Print E-mail
CO2 reforming of CH4 over Ni/mesostructured silica nanoparticles (Ni/MSN)†
S. M. Sidik, A. A. Jalil, S. Triwahyono, T. A. T. Abdullaha and A. Ripin
RSC Adv., 2015, 5, 37405
The development of supported Ni-based catalysts for CO2 reforming of CH4 was studied. Ni supported on mesostructured silica nanoparticles (MSN) and MCM-41 were successfully prepared using an in situ electrochemical method. The N2 physisorption results indicated that the introduction of Ni altered markedly the surface properties of MCM-41 and MSN. The TEM, H2-TPR and IR adsorbed CO studies suggested that most of the Ni deposited on the interparticles surface of MSN have higher reducibility than Ni plugged in the pores of MCM-41. Ni/MSN showed a higher conversion of CH4 at about 92.2% compared to 82.6% for Ni/MCM-41 at 750 C. After 600 min of the reaction, Ni/MCM-41 started to deactivate due to the formation of shell-like carbon which may block the active sites and/or surface of catalyst, as proved by TEM analyses. Contrarily, the activity of Ni/MSN was sustained for 1800 min of the reaction. The high activity of Ni/MSN was resulted from the presence of greater number of easily reducible Ni on the surface. In addition, the large number of medium-basic sites in Ni/MSN was capable to avoid the formation of shell-like carbon that deactivated the catalyst, thus increased the stability performance. The results presented herein provide new perspectives on Ni-based catalysts, particularly in the potential of MSN as the support.
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