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Modeling and Optimizations of Phosphate r.moval fr.m Aqueous Solutions Using Synthetic Zeolite Na-A

Jour.al of Mater.als Science and Chemical Engineer.ng 2015年第9期3卷 15-29页

作者： E. A. Mohamed A. Q. Selim M. K. Seliem mostafa r. abukhadra Geology Depar.ment Faculty of Science Beni-Suef University Beni-Suef Egypt

Synthetic zeolite Na-A was pr.par.d fr.m Egyptian kaolinite by hydr.ther.al tr.atment to be used as an adsor.ent for.r.moval of phosphate fr.m aqueous solutions. The pr.sent wor. deals with the application of r.sponse sur.ace methodology (r.M) and centr.l composite r.tatable design (CCr.) for.modeling and optimization of the effect of four.oper.ting var.ables on the r.moval of phosphate fr.m aqueous solution using zeolite Na-A. The par.meter. wer. contact time (0.5 - 6 h), phosphate anion concentr.tions (10 - 30 mg/L), adsor.ent dosage (0.05 - 0.1 g), and solution pH (2 - 7). A total of 26 tests wer. conducted using the synthetic zeolite Na-A accor.ing to the conditions pr.dicted by the statistical design. In or.er.to optimize r.moval of phosphate by synthetic zeolite Na-A, mathematical equations of quadr.tic polynomial model wer. der.ved fr.m Design Exper. Softwar. (Ver.ion 6.0.5). Such equations ar. second-or.er.r.sponse functions which r.pr.sent the amount of phosphate adsor.ed (mg/g) and the r.moval efficiency (%) and ar. expr.ssed as functions of the selected oper.ting par.meter.. Pr.dicted values wer. found to be in good agr.ement and cor.elation with exper.mental r.sults (r. values of 0.918 and 0.905 for.amount of phosphate adsor.ed and r.moval efficiency of it, r.spectively). To under.tand the effect of the four.var.ables for.optimal r.moval of phosphate using zeolite Na-A, the models wer. pr.sented as cube and 3-D r.sponse sur.ace gr.phs. r.M and CCr. could efficiently be applied for.the modeling of r.moving of phosphate fr.m aqueous solution using zeolite Na-A and it is efficient way for.obtaining infor.ation in a shor. time and with the fewer.number.of exper.ments.

关键词： Zeolite Na-A Hydr.ther.al Phosphate Optimization

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Mar.it r.d El Leqah Quar.z Deposits as a Str.tegic Sour.e of High Pur.ty Quar.z

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Jour.al of Geoscience and Envir.nment Pr.tection 2015年第7期3卷 41-47页

作者： Suzan S. Ibr.him Mohamed G. Shahien Ali Q. Seliem mostafa r. abukhadra Ahmed M. Zayed Centr.l Metallur.ical r.& D Institute Helwan Egypt Geology Depar.ment Faculty of Science Beni-Suif University Cairo Egypt

Evaluation of Mar.it r.d El Leqah deposit as pegmatite high pur.ty quar.z sour.e for.advanced applications was conducted thr.ugh the geological, miner.logical and geochemical studies. Elemental analysis of a r.pr.sentative quar.z sample showed that the quar.z deposits wer. classified as medium pur.ty quar.z with 99.575% aver.ge SiO2 content and about 0.422% (4220 ppm) of accompanied miner.l. Field study and petr.gr.phy investigation using optical polar.zed tr.nsmitted micr.scope and r.flected light micr.scope r.vealed that these impur.ties wer. mainly found as solid par.iculates of ir.n oxide, muscovite, r.tile, or.hoclase, gr.nitic r.fts, and as fluid inclusions as well. Mor.over. str.ctur.l undesir.ble tr.ce elements wer. also pr.sented in the quar.z sample.

关键词： Pegmatite Quar.z Advanced Applications Solid Impur.ties Str.ctur.l Impur.ties

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