Commercial reproduction or distribution of this file is strictly prohibited. To reproduce, post, ... more Commercial reproduction or distribution of this file is strictly prohibited. To reproduce, post, or mirror this document, please contact
In this work, an effective adsorbent-catalyst coupling (ACC) process is proposed and investigated... more In this work, an effective adsorbent-catalyst coupling (ACC) process is proposed and investigated to treat the wastewater polluted with triazole fungicides. In this regard, PEG-CuO as well as Ag particles were prepared and used as the adsorbent and catalyst in the ACC process, respectively. For comparison purposes, Fe<sub>3</sub>O<sub>4</sub> was also utilised as a catalyst. The experiments were conducted to remove penconazole, hexaconazole, and diniconazole (as representative fungicides which were analysed by HPLC-UV). The results show that sole catalysts could not completely remove the triazole fungicides. However, it was found that complete removal and degradation of all fungicides can be obtained using the ACC approach. In the next step, the effects of important operating parameters of the ACC process, i.e. adsorbent load, catalyst load, ratio of catalyst to adsorbent, salt concentration, pH, and operation time were studied. It was found that the optimum ...
Abstract Solution pH is an important parameter in photocatalytic reactions that substantially aff... more Abstract Solution pH is an important parameter in photocatalytic reactions that substantially affects the process by changing photocatalyst agglomeration and substrate adsorption on photocatalyst surface. In this work, a kinetic study was performed on photocatalytic hydrogen production from alcohols and an intrinsic kinetic model was developed to predict the rate of hydrogen production from different alcohols as a function of pH. Glycerol, ethanol, and methanol were selected as representative substrates and tested in a pH range of 2–12. The very good agreement between model predictions and experimental data was confirmed by statistical analyses (R2, R2adj, RMS, AAD, and MAE). The results revealed that for all substrates investigated, the maximum hydrogen rate was obtained at a pH~8. A local minimum for hydrogen production was observed around pHzpc, as a result of catalyst agglomeration. The results of this study can be very useful in future investigations of the effects of pH on other aqueous phase photocatalytic processes.
The Canadian Journal of Chemical Engineering, 2019
† This article has been accepted for publication and undergone full peer review but has not been ... more † This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as
The spent bleaching clays (SBC) of vegetable oil refining plants have residual vegetable oil cont... more The spent bleaching clays (SBC) of vegetable oil refining plants have residual vegetable oil contents ranging from 17 to 40 wt%. The common worldwide practice of landfilling such spent clays imposes inevitable environmental hazards. The extraction of oil from a spent clay will not only alleviate this problem, but can also provide an oil source for processes, such as transesterification for the production of alcohol-esters. In-situ transesterification of the residual oil within SBC is an even more attractive idea, as it can eliminate the extraction step from the process. In this study, in-situ transesterification on the spent bleaching clay of a local vegetable oil plant was investigated experimentally. Furthermore, optimum operating conditions were determined for a number of parameters influencing the conversions, including reaction temperature, ethanol-to-SBC ratio, alkali catalyst type, and catalyst-to-SBC mass ratio. The experiments were designed by the response surface method based on the central composite approach (RSM-CCD model). The results were analyzed using the analysis of variance method (ANOVA) to investigate the effect of the parameters on the efficiencies of the biodiesel produced and the oil removed from the initial SBC. Within the ranges investigated, the maximum conversion to ethyl-ester was 72.90% at the optimum conditions of a reaction temperature of 73.2°C, reaction time of 4.5 h, ethanol/SBC ratio of 4.2 ml/g, while using NaOH alkali catalyst with a catalyst-to-SBC mass ratio of 4.33%.
Commercial reproduction or distribution of this file is strictly prohibited. To reproduce, post, ... more Commercial reproduction or distribution of this file is strictly prohibited. To reproduce, post, or mirror this document, please contact
In this work, an effective adsorbent-catalyst coupling (ACC) process is proposed and investigated... more In this work, an effective adsorbent-catalyst coupling (ACC) process is proposed and investigated to treat the wastewater polluted with triazole fungicides. In this regard, PEG-CuO as well as Ag particles were prepared and used as the adsorbent and catalyst in the ACC process, respectively. For comparison purposes, Fe<sub>3</sub>O<sub>4</sub> was also utilised as a catalyst. The experiments were conducted to remove penconazole, hexaconazole, and diniconazole (as representative fungicides which were analysed by HPLC-UV). The results show that sole catalysts could not completely remove the triazole fungicides. However, it was found that complete removal and degradation of all fungicides can be obtained using the ACC approach. In the next step, the effects of important operating parameters of the ACC process, i.e. adsorbent load, catalyst load, ratio of catalyst to adsorbent, salt concentration, pH, and operation time were studied. It was found that the optimum ...
Abstract Solution pH is an important parameter in photocatalytic reactions that substantially aff... more Abstract Solution pH is an important parameter in photocatalytic reactions that substantially affects the process by changing photocatalyst agglomeration and substrate adsorption on photocatalyst surface. In this work, a kinetic study was performed on photocatalytic hydrogen production from alcohols and an intrinsic kinetic model was developed to predict the rate of hydrogen production from different alcohols as a function of pH. Glycerol, ethanol, and methanol were selected as representative substrates and tested in a pH range of 2–12. The very good agreement between model predictions and experimental data was confirmed by statistical analyses (R2, R2adj, RMS, AAD, and MAE). The results revealed that for all substrates investigated, the maximum hydrogen rate was obtained at a pH~8. A local minimum for hydrogen production was observed around pHzpc, as a result of catalyst agglomeration. The results of this study can be very useful in future investigations of the effects of pH on other aqueous phase photocatalytic processes.
The Canadian Journal of Chemical Engineering, 2019
† This article has been accepted for publication and undergone full peer review but has not been ... more † This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as
The spent bleaching clays (SBC) of vegetable oil refining plants have residual vegetable oil cont... more The spent bleaching clays (SBC) of vegetable oil refining plants have residual vegetable oil contents ranging from 17 to 40 wt%. The common worldwide practice of landfilling such spent clays imposes inevitable environmental hazards. The extraction of oil from a spent clay will not only alleviate this problem, but can also provide an oil source for processes, such as transesterification for the production of alcohol-esters. In-situ transesterification of the residual oil within SBC is an even more attractive idea, as it can eliminate the extraction step from the process. In this study, in-situ transesterification on the spent bleaching clay of a local vegetable oil plant was investigated experimentally. Furthermore, optimum operating conditions were determined for a number of parameters influencing the conversions, including reaction temperature, ethanol-to-SBC ratio, alkali catalyst type, and catalyst-to-SBC mass ratio. The experiments were designed by the response surface method based on the central composite approach (RSM-CCD model). The results were analyzed using the analysis of variance method (ANOVA) to investigate the effect of the parameters on the efficiencies of the biodiesel produced and the oil removed from the initial SBC. Within the ranges investigated, the maximum conversion to ethyl-ester was 72.90% at the optimum conditions of a reaction temperature of 73.2°C, reaction time of 4.5 h, ethanol/SBC ratio of 4.2 ml/g, while using NaOH alkali catalyst with a catalyst-to-SBC mass ratio of 4.33%.
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