The Effect Of Ph Solution Of Feed Phase On The Removal...

Figure. 7. Effect of pH solution of feed phase on the removal efficiency of citric acid Transport conditions: Feed phase: citric acid 10-2 M, pH 2-12. Stripping phase: deionized water, pH=6.8. Membrane: 12.60 cm2 of surface area, Calix[4]resorcinarene (0.15 g/g mixture of polymers), 0.03 ml 2-NPOE/g mixture of polymers. Values obtained after 5 days of experimentation. 3.8 Stability of PIMs In this study, one PIM was reused, whereas the feed and strip phases were replaced after one cycle with fresh ones in 5 experiments and each experiment lasted from 4 days. As observed in Fig. 8. The initial flux of PIM shows a gradual decrease with increasing of cycle’s reuse, which may be caused by the loss of carrier from membrane [37].†¦show more content†¦Conclusion In this study, a polymer inclusion membrane was prepared and succevally applied for the removal of citric acid from synthetic wastewater. The mixture of CTA and CA was found to be the optimum base polymer for quantitative transport of citric acid. Moreover, the nature of carrier especially alkyl chain length, stirring rate, and pH of feed phase are also important factors affecting the increased rate of citric acid transport. Hence, from results obtained it can be seen that the investigated calix[4]resorcinarene are effective extractants for citric acid and that their extraction abilities depend on the alkyl chain length of the substituent in the macrocycle. Choosing the appropriate length of alkyl chain, very selective system can be designed. The excellent efficiency for the citric acid transport by the proposed PIM system reveals its potential application for the selective removal, concentration and purification of citric acid from different media. References [1] K.L. Kalra, H.S. Grewal, Fungal production of citric acid, Biotechnol. Adv., 13 (2) (1995) 209–234. [2] M. Pazouki, P.A. Felse, J. Sinha, T. Panda, Comparative studies on citric acid production by Aspergillus niger and Candida lipolytica using molasses and glucose, Bioprocess Eng., 22 (2000) 353–361. [3] A.A. Ghoreyshi, F.A. Farhadpour, M. Soltanieh, M. Abdelghani, Transport of small polar molecules across nonporousShow MoreRelatedCell Biology Final Essay30093 Words   |  121 PagesStanley Millers experiment that applied electric sparks to a reducing atmosphere of methane, ammonia, water, and hydrogen showed that under these conditions, A) nucleotides can form. -B) amino acids can form. C) amino acids can polymerize into polypeptides. D) nucleotides can polymerize into nucleic acids. 7. Organisms that evolved the ability to use H2O as a donor of electrons and hydrogen for the photosynthesis conversion of CO2 to organic compounds radically changed Earth by producing Read MoreSexually Transmitted Diseases35655 Words   |  143 Pages 148-150 Onion and cheek cells 150-151 Ecological study 154 Seed structure and germination 155-157 Reproduction in plants 158-165 Sexually transmitted diseases 166-176 Birth Control and contraceptives 177-185 Effects on population growth 186-187 Drug and drug abuse 188-191 Man’s impact on the environment 192-199 Reproduction in man 200-201 References 202 Introduction Many people live their lives without having a clue about certain