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Enhanced solar photocatalytic activity of Er3+:YAlO3-loaded BiPO4 composite
Yunfan zhang,Rengaraj Selvaraj,Mika Sillanpaa,김영훈,Cheuk Wai Tai 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Er3+:YAlO3 loaded BiPO4 were successfully synthesized by a simple heat treatment approach in order to enhance the photocatalytic efficiency of BiPO4. Comparing with the simple substance of BiPO4, the composite system showed the better efficiency on photodegradation of Methlyene Blue (MB) solution under a simulated solar light irradiation. The relationship between loading amount and degradation rate was also investigated. It is found that the optimal loading amount of Er3+:YAlO3 is 7 wt%. The recycling test of selected sample was carried out to study the stability of the Er3+:YAlO3 loaded BiPO4 system. The composite materials were finally characterized by field-emission scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV–visible diffuse reflectance spectroscopy (UV–vis DRS). Based on the findings a possible mechanism has been proposed. The existence of luminescence agent (Er3+-doped YAlO3) and the occurrence of upconversion luminescence process have been related with the enhanced photodegradation of MB over composite system.
Catalytic activity evaluation of mesoporous a-GaOOH microspheres self-assembly
M. Muruganandham,Rominder Suri,Mika Sillanpaa,Bashir Ahmmad,Gang-Juan Lee,Jerry J. Wu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
The mesoporous a-GaOOH was synthesized using oxalic acid in a hydrothermal process at various hydrothermal temperatures and times. The nitrogen adsorption analysis indicated that a-GaOOH with surface areas ranging from 6 to 87 m2/g and pore sizes from 3.8 to 7.2 nm can be prepared by adjusting the experimental conditions. The photocatalytic hexavalent chromium reduction was studied under UV light irradiation and the results showed that a-GaOOH having higher surface area owned higher photocatalytic activity. The degradation of 2-ethoxy ethyl acetate in catalytic ozonation process showed that the degradation was enhanced over ozonation process in the presence of mesoporous a-GaOOH
Raspberry derived mesoporous carbon-tubules and fixed-bed adsorption of pharmaceutical drugs
Dubey, S.P.,Dwivedi, A.D.,Lee, C.,Kwon, Y.N.,Sillanpaa, M.,Ma, L.Q. Korean Society of Industrial and Engineering Chemi 2014 Journal of industrial and engineering chemistry Vol.20 No.3
Novel mesoporous carbon-tubules were prepared from wild plant leaves of Rubus idaeus (Raspberry) and their physicochemical characteristics were analyzed by spectroscopic and potentiometric titration methods. The developed carbon-tubules were applied for the aqueous phase decontamination of three pharmaceutical drugs. Ibuprofen, naproxen and clofibric acid were selected for the study. Batch and fixed-bed studies were performed to investigate the adsorption of selected pharmaceutical drugs. Mathematical modelings were applied to the experimental data in order to estimate the maximum adsorption capacity and evaluate the characteristics of the fixed-bed. Based on finding, the adsorption mechanism was investigated by adsorbate and adsorbent physicochemical characteristics.
Steel slag as a low-cost sorbent for metal removal in the presence of chelating agents
Eveliina Repo,Jolanta K. Warchoł,Lena Johansson Westholm,Mika Sillanpaa 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Industrial byproduct, steel slag was used as a low-cost sorbent for the removal of Co(II), Ni(II), Cd(II), andPb(II) from aqueous solutions containing chelating agents; EDTA, citrate, and oxalate. Equilibrium andkinetic studies were conducted. Clear dependency between speciation of metals and their sorptionbehavior was observed. Precipitation and adsorption were suggested as main mechanisms. Diffusionplayed an important role in the kinetics of metal removal. Notable leaching of elements was observedwhen steel slag was in contact with the solutions under study. Modification with chitosan wassuccessfully used to prevent leaching and improve the sorption capacity of steel slag.
Raspberry derived mesoporous carbon-tubules and fixed-bed adsorption of pharmaceutical drugs
Shashi Prabha Dubey,권영남,이창하,Amarendra Dhar Dwivedi,Mika Sillanpaa,Lena Q. Ma 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Novel mesoporous carbon-tubules were prepared from wild plant leaves of Rubus idaeus (Raspberry) andtheir physicochemical characteristics were analyzed by spectroscopic and potentiometric titrationmethods. The developed carbon-tubules were applied for the aqueous phase decontamination of threepharmaceutical drugs. Ibuprofen, naproxen and clofibric acid were selected for the study. Batch andfixed-bed studies were performed to investigate the adsorption of selected pharmaceutical drugs. Mathematical modelings were applied to the experimental data in order to estimate the maximumadsorption capacity and evaluate the characteristics of the fixed-bed. Based on finding, the adsorptionmechanism was investigated by adsorbate and adsorbent physicochemical characteristics.
Gaurav Sharma,Amit Kumar,Mu. Naushad,Deepak Pathania,Mika Sillanpaa 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
Polyacrylamide Zr(IV) vanadophosphate (PAM/ZVP) nanocomposite was synthesized via simple sol–gelmethod. The synthesized PAM/ZVP nanocomposite was studied for its ion exchange properties. Thenanocomposite showed higher ion exchange capacity (IEC) compared to its inorganic counterpart Zr(IV)vanadophosphate (ZVP). The nanocomposite was well characterized using various techniques viz.-TEM,SEM, XRD, and FTIR. The PAM/ZVP showed promising photocatalytic nature for degradation of Congo reddye under sunlight. The enhanced dye remediation was observed as material behaved as adsorbent andphotocatalyst simultaneously under coupled conditions in dye removal experiments. Thus, PAM/ZVP is aprobable superior hybrid photo catalyst for dye waste treatment
Dubey, S.P.,Dwivedi, A.D.,Lahtinen, M.,Lee, C.,Kwon, Y.N.,Sillanpaa, M. Pergamon 2013 Spectrochimica acta. Part A, Molecular and biomole Vol.103 No.-
This article is aimed to extend a simple protocol for preparation of various plant leaves extract and their application to green synthesis of the metallic nanoparticles. Five plant leaves extract showed mild reduction and stabilization ability for silver and gold nanoparticles (AgNPs and AuNPs) at room temperature. The particle size range varied from 25 to 42nm and 21 to 47nm for AgNPs and AuNPs, respectively. Plant leaves extract-mediated nanoparticles were characterized to confirm the shape, size, crystallinity, and content using different spectroscopic investigations. Differences in stability of nanoparticles at different pH were also measured by zeta potential.