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Full-Text Articles in Engineering
Manganese Removal By Low Cost Adsorbent From Synthetic Wastewater-A Review, Innovative Research Publications Irp India, Vinod Pahade, A. K. Sharma
Manganese Removal By Low Cost Adsorbent From Synthetic Wastewater-A Review, Innovative Research Publications Irp India, Vinod Pahade, A. K. Sharma
Innovative Research Publications IRP India
Manganese (Mn) is one of the most abundant metals in Earth’s crust. Manganese is present in ground water as a divalent ion (Mn2+) and is considered a pollutant mainly because of its organoleptic properties. It is an essential metal for the human system and many enzymes are activated by manganese. Therefore, manganese has to be removed from some waters and wastewaters for various reasons. Conventional chemical and physical treatments for Mn(II) removal from contaminated effluent consist of precipitation, depth filtration, ion exchange, adsorption and oxidation. The adsorption technique has been found to be one of the most effective for the …
Comparative Kinetic Study Of Functionalized Carbon Nanotubes And Magnetic Biochar For Removal Of Cd2+ Ions From Wastewater
Faculty of Engineering University of Malaya
We did a comparative study between functionalized multiwall carbon nanotube (FMWCNTs), and magnetic biochar was carried out to determine the most efficient adsorbent to be employed in the Cd2+ ion removal. We optimized parameters such as agitation speed, contact time, pH and adsorbent dosage using design expert vrsion 6.08. The statistical analysis reveals that optimized condition for highest removal of Cd2+ are at pH 5.0, with dosage 1.0 g, agitation speed and contact time of 100 rpm and 90 minutes, respectively. For the initial concentration of 10mg/l, the removal efficiency of Cd2+ using FMWCNTs was 90% and and 82% of …
Effect Of Microwave Frequency On Dielectric Properties Of Oil Palm Shell (Ops) And Ops Char Synthesized By Microwave Pyrolysis Of Ops
Faculty of Engineering University of Malaya
Microwave heating is considered to be a potential, efficient and fast method for thermal treatment of biomass. Therefore, elemental understanding of dielectric properties of biomass is necessary before irradiating it with microwave radiations. Dielectric properties along with penetration depth, relaxation time and static permittivity of oil palm shell COPS) and OPS char were investigated in the frequency ranging between 0.5 and 20 GHz at room temperature. At low frequencies, dielectric constant of UPS was higher than that of UPS char while at higher frequencies, vice versa is observed. Penetration depth for UPS char was higher than that of UPS at …
Lead Sorption By Carbon Nanofibers Grown On Powdered Activated Carbon - Kinetics And Equilibrium
Lead Sorption By Carbon Nanofibers Grown On Powdered Activated Carbon - Kinetics And Equilibrium
Faculty of Engineering University of Malaya
Carbon nanofibers (CNFs) were synthesized by using a safe and less hazardous method, compared to using floating catalysts in chemical vapor deposition (CVD) process. This process used C2H2 as carbon source and oil palm kernel shell-based powdered activated carbon (PAC) as cheap solid substrate. Use of nickel (Ni2+) impregnated PAC as fixed substrate for the synthesis of CNF is one of the novelties of the research work accomplished by the authors. The PAC CNFs porous nanocomposite product was used for the sorption of lead ions (Pb2+) from synthetic aqueous solution. Kinetics of Pb2+ adsorption and isotherms were investigated by varying …
Utilization Of Palm Oil Sludge Through Pyrolysis For Bio-Oil And Bio-Char Production
Utilization Of Palm Oil Sludge Through Pyrolysis For Bio-Oil And Bio-Char Production
Faculty of Engineering University of Malaya
In this study, pyrolysis technique was utilized for converting palm oil sludge to value added materials: bio-oil (liquid fuel) and bio-char (soil amendment). The bio-oil yield obtained was 27.4 +/- 1.7 wt.% having a heating value of 22.2 +/- 3.7 MJ/kg and a negligible ash content of 0.23 +/- 0.01 wt.%. The pH of bio-oil was in alkaline region. The bio-char yielded 49.9 +/- 0.3 wt.%, which was further investigated for sorption efficiency by adsorbing metal (Cd2+ ions) from water. The removal efficiency of Cd2+ was 89.4 +/- 2%, which was almost similar to the removal efficiency of a commercial …
Physico-Chemical Characterization Of Metal-Doped Bone Chars And Their Adsorption Behavior For Water Defluoridation, Cintia Karina Rojas-Mayorga, Adrian Bonilla-Petriciolet, Joaquín Silvestre-Albero, Ismael A. Aguayo-Villarreal, Didilia I. Mendoza-Castillo
Physico-Chemical Characterization Of Metal-Doped Bone Chars And Their Adsorption Behavior For Water Defluoridation, Cintia Karina Rojas-Mayorga, Adrian Bonilla-Petriciolet, Joaquín Silvestre-Albero, Ismael A. Aguayo-Villarreal, Didilia I. Mendoza-Castillo
Adrian Bonilla-Petriciolet
New bone chars for fluoride adsorption from drinking water have been synthetized via a metal doping using aluminum and iron salts. A detailed statistical analysis of the metal doping process using the signal-to-noise ratios from Taguchi’s experimental designs and its impact on the fluoride adsorption properties of modified bone chars have been performed. The best conditions, including the proper metallic salt, for metal doping were identified to improve the fluoride uptakes of modified bone chars. Results showed that the fluoride adsorption properties of bone chars can be enhanced up to 600% using aluminum sulfatefor the surface modification. This aluminum-based adsorbent …
Performance Evaluation Of Natural Iron-Rich Sandy Soil As A Low-Cost Adsorbent For Removal Of Lead From Water, Yee Sern Ng, Bhaskar Sen Gupta, Mohd Ali Hashim
Performance Evaluation Of Natural Iron-Rich Sandy Soil As A Low-Cost Adsorbent For Removal Of Lead From Water, Yee Sern Ng, Bhaskar Sen Gupta, Mohd Ali Hashim
Ng Yee-Sern
Technical feasibility of natural iron-rich sandy soil as a low-cost adsorbent for removal of lead from water was investigated . The soil, which had an iron content of 3,719 mg/kg, was collected from Hulu Langat, Malaysia, and was used for adsorption studies without any surface modification through chemical treatment. The effects of pH, solution: soil ratio and initial lead concentration on the adsorption efficiency were studied using response surface methodology based on Box–Behnken experimental design. The results showed that pH of the solution had the highest impact on the adsorption efficiency whereby adsorption efficiency of 97% could be achieved at …
Sorption Mechanism Of Anionic Dyes On Pecan Nut Shells (Carya Illinoinensis) Using Batch And Continuous Systems, Ismael A. Aguayo-Villarreal, Luis A. Ramírez-Montoya, Virginia Hernández-Montoya, Adrian Bonilla-Petriciolet, Miguel A. Montes-Morán, Elsa M. Ramírez-López
Sorption Mechanism Of Anionic Dyes On Pecan Nut Shells (Carya Illinoinensis) Using Batch And Continuous Systems, Ismael A. Aguayo-Villarreal, Luis A. Ramírez-Montoya, Virginia Hernández-Montoya, Adrian Bonilla-Petriciolet, Miguel A. Montes-Morán, Elsa M. Ramírez-López
Adrian Bonilla-Petriciolet
The biomass derived from pecan nut processing (Carya illinoinensis) fro alimentary purpose, specifically the pecan shells were used in this work as a biosorbent of acid blue 74 (AB74), acid blue 25 (AB25) and reactive blue 4 (RB4). This biomass was characterized by ultimate and proximate analysis. FT-IR spectroscopy, X-ray diffraction and SEM/EDX. Adsorption studies were performed in batch and continuous systems and adsorption kinetics, isotherms and breakthrough curves were experimentally determined. Results obtained suggest that the calcium compounds occurring in pecan shells are responsible of the favorable adsorption of anionic dyes, specifically for the removal of AB74. Biosorption results …
Modeling Of Fixed-Bed Adsorption Of Fluoride On Bone Char Using A Hybrid Neural Network Approach, Rigoberto Tovar-Gómez, Ma. Del Rosario Moreno-Virgen, José Alonso Dena-Aguilar, Virginia Hernández-Montoya, Adrian Bonilla-Petriciolet, Miguel A. Montes-Moran
Modeling Of Fixed-Bed Adsorption Of Fluoride On Bone Char Using A Hybrid Neural Network Approach, Rigoberto Tovar-Gómez, Ma. Del Rosario Moreno-Virgen, José Alonso Dena-Aguilar, Virginia Hernández-Montoya, Adrian Bonilla-Petriciolet, Miguel A. Montes-Moran
Adrian Bonilla-Petriciolet
This study introduces a hybrid model based on the Thomas equation and artificial neural networks (ANNs) for the modeling of unsymmetrical breakthrough curves obtained from the fluoride adsorption on bone char. Experimental results of kinetics, isotherms and breakthrough curves of fluoride adsorption on two commercial bone chars have been used for analyzing the capabilities and limitations of this hybrid ANN model. Performance of this hybrid model has been studied and compared with respect to the results of traditional linear regression of the Thomas breakthrough equation at different operating conditions of packed-bed adsorption columns. Results showed that an improvement in the …
Optimizing The Removal Of Fluoride From Water Using New Carbons Obtained By Modification Of Nut Shell With A Calcium Solution From Egg Shell, Virginia Hernandez-Montoya, Luis A. Ramirez-Montoya, Adrian Bonilla-Petriciolet, Miguel A. Montes-Moran
Optimizing The Removal Of Fluoride From Water Using New Carbons Obtained By Modification Of Nut Shell With A Calcium Solution From Egg Shell, Virginia Hernandez-Montoya, Luis A. Ramirez-Montoya, Adrian Bonilla-Petriciolet, Miguel A. Montes-Moran
Adrian Bonilla-Petriciolet
Carbons loaded with specific chemical moieties were prepared from pecan nut shells employing a natural modifier agent obtained from egg shell, which is rich in calcium, for the selective adsorption of fluoride from water. A L4 orthogonal array of the Taguchi method was used to optimize the synthesis conditions for obtaining these selective carbons. The samples obtained were characterized and the elemental composition, textural parameters and morphology were determined. Fluoride adsorption experiments were performed in synthetic and real groundwater samples. Results showed that carbons obtained from pecan nut shells modified with a calcium solution extracted from egg shells (CMPNS) were …
Role Of The Pericarp Of Carya Illinoinensis As Biosorbent And Precursor Of Activated Carbon For The Removal Of Lead And Acid Blue 25 In Aqueous Solution, Virginia Hernández-Montoya, Didilia I. Mendoza-Castillo, Adrian Bonilla-Petriciolet, María Ana Pérez-Cruz, Miguel A. Montes-Moran
Role Of The Pericarp Of Carya Illinoinensis As Biosorbent And Precursor Of Activated Carbon For The Removal Of Lead And Acid Blue 25 In Aqueous Solution, Virginia Hernández-Montoya, Didilia I. Mendoza-Castillo, Adrian Bonilla-Petriciolet, María Ana Pérez-Cruz, Miguel A. Montes-Moran
Adrian Bonilla-Petriciolet
The pecan nuts are widely cultivated in states of north of Mexico and the residues generated during nut processing are abundant and not reused. In the present study, the pericarp of pecan (PP) was physicochemically characterized and their use as low cost biosorbent of lead and acid blue 25 was studied in batch systems at different experimental conditions. Also, the PP was used as precursor of activated carbon and a natural modifier agent extracted from egg shells was used in the synthesis of the carbons. Results suggest that the pericarp of pecan (PP) has an acidic character due to the …
Spreading Profile Of Dopant Solution On Pre-Sintered Silica Layers For Selective Area Doping Of Integrated Optic Planar Glass Samples
A.S. Md Abdul Haseeb
The spread profile of potassium-permanganate (KMnO4) dye on a porous pre-sintered silica layer deposited via Flame Hydrolysis Deposition is presented. The work is aimed at controlling the dopant profile on the resulting glass layer for optically passive and active devices integration. KMnO4 is used as it allows visual qualification of its spread on the soot layer. Pre-sintered silica layers allow for application of dopants into the glass matrix via adsorption and pore retention. Selective area doping is achieved by applying specific volumes of the dye onto pre-selected areas on the sample using a micropipette. Higher dye volumes applied would result …
Aplicación Del Método De Optimización De Recocido Simulado En La Regresión De Isotermas De Adsorción, Adrian Bonilla-Petriciolet, María Guadalupe Lira-Padilla, Carlos A. Soto-Becerra
Aplicación Del Método De Optimización De Recocido Simulado En La Regresión De Isotermas De Adsorción, Adrian Bonilla-Petriciolet, María Guadalupe Lira-Padilla, Carlos A. Soto-Becerra
Adrian Bonilla-Petriciolet
The nonlinear parameter estimation of thermodynamic models, including the adsorption isotherms, is a multivariable and nonlinear problem that can present several local optimums. The conventional optimization methods used in the parameter estimation of adsorption isotherms are efficient but they are not reliable to solve such problem. In this paper, we describe the application of the stochastic global optimization method simulated annealing in the nonlinear regression of adsorption isotherms. This method has been applied with Toth and Sips models. Our results indicate that this method is a reliable optimization strategy for parameter estimation in adsorption isotherms.
An Adsorbent Prepared For Fluoride Removal From Water, Rodolfo Trejo-Vázquez, Adrian Bonilla-Petriciolet
An Adsorbent Prepared For Fluoride Removal From Water, Rodolfo Trejo-Vázquez, Adrian Bonilla-Petriciolet
Adrian Bonilla-Petriciolet
In this paper, we report the preparation of an adsorbent for fluoride removal from drinking water. This adsorbent was prepared using a thermal treatment of pseudoboehmite agglomerates. Taguchi and Surface Response methodologies were used in order to standardize the adsorbent synthesis and to obtain the best fluoride removal rate of adsorbent. The fluoride removal rate of our adsorbent was higher than those obtained for a commercial alumina and bone charcoal. This adsorbent was also tested and compared using different experimental conditions with fluoride solutions and tap water.
Terminology: Preg Robbing, Fathi Habashi
Terminology: Preg Robbing, Fathi Habashi
Fathi Habashi
Should the term "preg robbing" be used ?