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Mohammad Arif Budiman Pauzan,Siti Khadijah Hubadillah,Mohd Hafiz Dzarfan Othman,Nurul Jannah Ismail,Mohd Hafiz Puteh,Huda Abdullah,Suriani Abu Bakar,Siti Hamimah Sheikh Abdul Kadir,Wong Keng Yinn 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.12
Kaolin has been found to be a more economical alternative in ceramic hollow membrane fabrication compared to alumina, silica, and zirconia despite having similar properties. However, it was discovered that apart from having high mechanical strength and the ability to withstand high operational temperature, the kaolin membrane has the tendency to dissolve in a high alkaline solution. Hence, in this study, zirconia (ZrO2) was imposed to kaolin suspension as co-starting material due to its stable hexagonal properties with kaolin to overcome this drawback. To study the dissolution property of the modified kaolin-based membrane, a phase inversion technique was used to fabricate zirconia- kaolin hollow fiber membrane (ZKHFM) followed by immersion in ammonium hydroxide (NH4OH) as an alkaline solution. Ammonia was aptly chosen for it being considered as one of the pollutants to be removed from wastewater. The mechanism, morphology and properties of the membrane were investigated in terms of sintering temperature, morphology, mechanical strength, pore size and porosity The results showed that ZKHFM with 10 wt% (ZK-10) with sintering temperature of 1,200 oC had the best performance in terms of having high mechanical strength (21MPa), excellent permeation flux (~1,600 Lm2/h) and lowest dissolution (0.01 g dissolute) at pH 13, indicating the ability of ZKHFM to be used in alkaline solution.
Mohd Ridhwan Adam,Mohd Hafiz Dzarfan Othman,Siti Hamimah Sheikh Abdul Kadir,Muthia Elma,Tonni Agustiono Kurniawan,Ahmad Fauzi Ismail,Mohd Hafiz Puteh,Azeman Mustafa,Mukhlis A. Rahman,Juhana Jaafar,Hud 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.4
This work investigates the effectiveness of ammoniacal nitrogen (NH4 +-N) removal from contaminated water by adsorptive hollow fiber ceramic membrane (HFCM) derived from naturally made clinoptilolite. The technological value of this work is the simple mechanism of the adsorptive HFCM in removing gaseous ammonia in water by combining adsorption and separation. To test the technical feasibility of this proposed technology, clinoptilolite HFCM was fabricated via phase inversion-based extrusion/sintering technique and characterized by SEM and water permeation flux. The produced HFCM corresponds to the desired morphology of the asymmetric structure (dense and void formations) with outstanding adsorption performance of NH4 +-N. The effects of the HFCM’s operational parameters on its removal are examined in terms of membrane dosage and isothermal studies. The adsorption isotherm behavior exhibited that the adsorption process fitted the Freundlich isotherm model with outstanding removal performance even at trace concentration of ammonia. The low amount used by HFCM (4.75×104m2) resulted in over 96% ammonia removal, indicating a low cost of adsorption process. The regeneration of saturated HFCM suggests an outstanding recovery of the HFCM for its subsequent use for NH4 +-N removal. This study also reveals the potential of adsorptive HFCM as a simple and cost-effective technology for ammonia removal from wastewater.