The LaMnO3 perovskite catalyst was successfully synthesized using a simple solid-state reaction method. This catalyst is used to activate PMS in the organic content's degradation process in the secondary effluent palm oil mill... more
The LaMnO3 perovskite catalyst was successfully synthesized using a simple solid-state reaction method. This catalyst is used to activate PMS in the organic content's degradation process in the secondary effluent palm oil mill (POMSE). The organic content in POMSE is equivalent to the COD value; thus the COD value is used as a parameter for the process's success. The catalyst performance test shows that the catalyst effectively reduces COD, and the waste meets the maximum threshold allowed by government regulations. The variables that affect the catalyst's effectiveness were the calcination temperature of the catalyst, catalyst loading, PMS concentration, and temperature. The temperature of calcination affects the perovskite crystal formation; the higher the temperature, the more active catalyst obtained. The catalyst loading and PMS concentration variables affect the degradation process of organic levels in POMSE; at low levels, the higher the catalyst loading and PMS c...
In this paper, periodic force operation of a wastewater treatment process has been studied for the improved process performance. A previously developed dynamic model for the process is used to conduct the performance analysis. The static... more
In this paper, periodic force operation of a wastewater treatment process has been studied for the improved process performance. A previously developed dynamic model for the process is used to conduct the performance analysis. The static version of the model was utilized first to determine the optimal productivity conditions for the process. Then, feed flow rate in terms of dilution rate i.e. (D) is transformed into sinusoidal function. Nonlinear model predictive control algorithm is utilized to regulate the amplitude and period of the sinusoidal function. The parameters of the feed cyclic functions are determined which resulted in improved productivity than the optimal productivity under steady state conditions. The improvement in productivity is found to be marginal and is satisfactory in substrate conversion compared to that of the optimal condition and to the steady state condition, which corresponds to the average value of the periodic function. Successful results were also obt...
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Zn-air batteries (ZABs) have been recognized as one of the most efficient, cost effective and environmentally benign energy storage devices that may play an important role in future sustainable energy system. Air electrode is a key part... more
Zn-air batteries (ZABs) have been recognized as one of the most efficient, cost effective and environmentally benign energy storage devices that may play an important role in future sustainable energy system. Air electrode is a key part of ZABs, where oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) appear during discharge and charge processes which largely determine the performance, such as durability, rate performance and round-trip efficiency. However, the sluggish kinetics of ORR/OER could cause high cell overpotential, thus requiring certain electrocatalyst to speed up both reactions. Based on several considerations, such as cost, activity, stability, and conductivity, metal-free carbon materials have received considerable attentions as electrocatalysts of air electrode in ZABs to boost both OER and ORR. In this review articles, the recent progress in applying metal-free carbon materials as air electrode in ZABs is summarized. The two main ways to tune the pr...
1Department of Chemical Engineering, Riau University, Pekanbaru 28293, Indonesia 2Research Center for Physics, Indonesian Institute of Science (LIPI), Serpong 15314, 3School of Engineering, Edith Cowan University, 270 Joondalup Drive,... more
1Department of Chemical Engineering, Riau University, Pekanbaru 28293, Indonesia 2Research Center for Physics, Indonesian Institute of Science (LIPI), Serpong 15314, 3School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA, Australia 4Chemical Engineering, WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Australia 5School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China. 6Center of Excellence in the Department of Nanotechnology and Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia LaMnO3 Perovskite Activation of Peroxymonosulfate for Catalytic Palm Oil Mill Secondary Effluent
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The energy industry is exploring sustainable chemistry and engineering solutions for exploitation of shale reservoirs. Smectite-rich shale is challenging to drill with traditional water-based drill...
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The development of bi-functional electrocatalyst with high catalytic activity and stable performance for both oxygen evolution/reduction reactions (OER/ORR) in aqueous alkaline solution is key to realize practical application of zinc–air... more
The development of bi-functional electrocatalyst with high catalytic activity and stable performance for both oxygen evolution/reduction reactions (OER/ORR) in aqueous alkaline solution is key to realize practical application of zinc–air batteries (ZABs). In this study, we reported a new porous nano-micro-composite as a bi-functional electrocatalyst for ZABs, devised by the in situ growth of metal–organic framework (MOF) nanocrystals onto the micrometer-sized Ba0.5Sr0.5Co0.8Fe0.2O3 (BSCF) perovskite oxide. Upon carbonization, MOF was converted to porous nitrogen-doped carbon nanocages and ultrafine cobalt oxides and CoN4 nanoparticles dispersing inside the carbon nanocages, which further anchored on the surface of BSCF oxide. We homogeneously dispersed BSCF perovskite particles in the surfactant; subsequently, ZIF-67 nanocrystals were grown onto the BSCF particles. In this way, leaching of metallic or organic species in MOFs and the aggregation of BSCF were effectively suppressed, t...
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Abstract Metal organic frameworks (MOFs) find many potential applications because of their versatile physicochemical properties. Advanced oxidation is an important way for wastewater remediation to realize sustainable supply of clean... more
Abstract Metal organic frameworks (MOFs) find many potential applications because of their versatile physicochemical properties. Advanced oxidation is an important way for wastewater remediation to realize sustainable supply of clean water. However, due to the lack of water-stable MOFs with sufficient catalytic activity, the application of MOFs in advanced oxidation processes (AOP) for wastewater treatment is greatly hindered. In this study, by taking advantage of the rich pores of water stable MOFs, we develop a MOFs-based core (water stable MOFs)-shell (NiP) structure as an efficient catalyst for peroxymonosulfate (PMS) activation in AOP. Here, water stable MIL-96 as the MOFs is synthesized by a hydrothermal method, and the core-shell structured MIL-96@NiP is facilely synthesized through electroless coating of the NiP layer. The as-prepared core-shell structure demonstrates superior performance in catalytic degradation of rhodamine B (RhB), over performing the individual MOFs and NiP parts, suggesting the appearance of synergistic effect between MOFs and NiP in the core-shell structure. Furthermore, the catalyst demonstrates four consecutive runs without losing significant catalytic activity. Temperature has a significant role in faster degradation of RhB. A plausible degradation mechanism is proposed through classical quenching tests study, and oxygen singlet is found to play imperative part in removal of RhB.
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Abstract In this paper, we demonstrate a cascade application of functional materials in adsorption and catalysis. Metal organic frameworks, MIL-96, were synthesized by a single solvent (water), and methanol (MIL-96-Me) or ethanol... more
Abstract In this paper, we demonstrate a cascade application of functional materials in adsorption and catalysis. Metal organic frameworks, MIL-96, were synthesized by a single solvent (water), and methanol (MIL-96-Me) or ethanol (MIL-96-Et) modulated method. Methanol modulation results in a change in porous structure and better CO2 adsorption and selectivity. After gas-phase adsorption of CO2, the MIL-96 can be reused for liquid-phase removal of water contaminants, demonstrating high capacities of para-hydroxybenzoic acid (p-HBA). Then, a transformation of the used MIL-96 by pyrolysis was employed to produce a metal oxide/C composite for catalytic activation of peroxymonosulfate (PMS) to degrade an organic pollutant, methyl orange. The composite exhibited excellent performance in the dye degradation. This study presents a proof of concept of integrated utilization of robust and functional nanomaterials for multiple applications without producing solid wastes after each use.
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Water-stable and active metal organic frameworks (MOFs) are important materials for mitigation of water contaminants via adsorption and catalytic reactions. In this study, a highly water-stable Co-based MOF, namely bio-MOF-11-Co, was... more
Water-stable and active metal organic frameworks (MOFs) are important materials for mitigation of water contaminants via adsorption and catalytic reactions. In this study, a highly water-stable Co-based MOF, namely bio-MOF-11-Co, was synthesized by a simplified benign method. Moreover, it was used as a catalyst in successful activation of peroxymonsulfate for catalytic degradation of sulfachloropyradazine (SCP) and para-hydroxybenzoic acid (p-HBA) as representatives of pharmaceuticals and personal care products, respectively. The bio-MOF-11-Co showed rapid degradation of both p-HBA and SCP and could be reused multiple times without losing the activity by simply water washing. The effects of catalyst and PMS loadings as well as temperature were further studied, showing that high catalyst and PMS loadings as well as temperature produced faster kinetic degradation of p-HBA and SCP. The generation of highly reactive and HO radicals during the degradation was investigated by quenching te...
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Adsorptive removal of a toxic sulfonamide antibiotic, sulfachloropyradazine (SCP), from aqueous solution was studied on several metal organic frameworks, UiO-66 and ZIF-67, for the first time. UiO-66 exhibited a much higher adsorption... more
Adsorptive removal of a toxic sulfonamide antibiotic, sulfachloropyradazine (SCP), from aqueous solution was studied on several metal organic frameworks, UiO-66 and ZIF-67, for the first time. UiO-66 exhibited a much higher adsorption capacity than ZIF-67, fast kinetics, and easy regeneration for reuse, demonstrating as a promising adsorbent in wastewater treatment processes. The batch adsorption shows an adsorption capacity of SCP at 417mg/g on UiO-66. The kinetic adsorption of SCP on UiO-66 reached equilibrium just in 10min and the kinetics fits accurately with a pseudo 2nd order model. A plausible mechanism was proposed based on pH effect, pKa value of the adsorbate and Zeta potential of UiO-66. The high adsorption is mainly contributed to hydrophobicity and π-π interactions along with electrostatic interactions. Thermodynamic studies show the spontaneous adsorption and exothermic process. The easy regeneration and high adsorption capacity confirms structural stability of the rob...
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In this study, binary metal organic frameworks (MOFs) with HKUST-1 and UiO-66 have been synthesized in a one-pot process. The synthesized MOFs were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD),... more
In this study, binary metal organic frameworks (MOFs) with HKUST-1 and UiO-66 have been synthesized in a one-pot process. The synthesized MOFs were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption, and thermogravimetric analysis (TGA). The meso-porosity and thermal stability of the binary MOFs were higher than those of single HKUST-1 or UiO-66. The synthesized MOF hybrids were then tested for adsorptive removal of methylene blue (MB) from wastewater in terms of kinetic and isothermal adsorption as compared to a commercially available activated carbon (AC). All the synthesized MOFs showed significant removal of MB under a wide range of pH. The adsorption capacities of HKUST-1 are higher than UiO-66 and commercial AC while the binary MOFs presented an even higher adsorption capacity than single MOFs. This is the first time that binary HKUST-1 and UiO-66 MOFs have been successfully synthesized an...
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The increasing concerns on toxicity of sulfonamide antibiotics in water require a prompt action to establish efficient wastewater treatment processes for their removal. In this study, adsorptive removal of a model sulfonamide antibiotic,... more
The increasing concerns on toxicity of sulfonamide antibiotics in water require a prompt action to establish efficient wastewater treatment processes for their removal. In this study, adsorptive removal of a model sulfonamide antibiotic, sulfachloropyridazine (SCP), from wastewater is presented for the first time using a metal organic framework (MOF). A high surface area and thermally stable MOF, HKUST-1, was synthesized by a facile method. Batch adsorption studies were systematically carried out using HKUST-1. The high surface area and unsaturated metal sites resulted in a significant adsorption capacity with faster kinetics. Most of the SCP was removed in 15min and the kinetic data were best fitted with the pseudo second order model. Moreover, isothermal data were best fitted with the Langmuir model. The thermodynamic results showed that the adsorption is a spontaneous and endothermic process. The adsorption capacity of HKUST-1 is 384mg/g at 298K which is the highest compared to most of the materials for the antibiotics. The high adsorption capacity is attributed mainly to π-π stacking, hydrogen bonding and electrostatic interactions.
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ABSTRACT Electroless Ni–P coatings offer excellent corrosion and wear resistance and ability to withstand acidic and salt solutions. Medium and high phosphorus Ni–P coatings were produced using plating baths with 10 g/L or 25 g/L of... more
ABSTRACT Electroless Ni–P coatings offer excellent corrosion and wear resistance and ability to withstand acidic and salt solutions. Medium and high phosphorus Ni–P coatings were produced using plating baths with 10 g/L or 25 g/L of sodium hypophosphite as reducing agent (RA) with composition of the resulting deposits to be 91.5 Ni: 8.5 P and 87.6 Ni: 12.4 P, respectively. From field-emission scanning electron microscope (FE-SEM) examination, the deposit morphology was found to change from nodular with surface porosity and cracks to dense, smooth upon increasing the RA content. Addition of nanostructures such as nanoparticles of alumina (Al2O3) or silicon carbide (SiC) or multi-walled carbon nanotubes (CNT) into Ni–P matrix, at low loading levels, was investigated for their effect on corrosion resistance and hardness of Ni–P–Al2O3, Ni–P–SiC and Ni–P–CNT composite coatings. Electrochemical impedance spectroscopy (EIS) studies in 4wt.% NaCl solution revealed 91.5 Ni: 8.5 P coating to offer much superior corrosion resistance than 87.6 Ni: 12.4 P coating even after immersion for 42 days. Among all composite coatings, however, Ni–P–Al2O3 produced from 1.0 g/L Al2O3 in plating solution exhibits higher impedance values at low and intermediate frequencies. Nyquist plots for different frequencies were analyzed for comparison between different composite coatings. Microhardness tests indicate higher hardness value of 8.46 GPa for Ni–P–SiC coating as compared to 7.42 GPa for pure Ni–P coating.