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a.a.ysis of the a.sorption of Toxic Chrom.um.(VI) by Untrea.ed a.d Chitosa. Trea.ed Ba.a.a.a.d a.eca.Fiber

Journa. of Textile Science a.d Technology 2020年第2期6卷 81-106页

作者： Hosne a.a.Begum.a. k. m. monjurul haque m.. Dida.ul Isla. m. m.hedi Ha.a. Suza.a.m.d m.. Ra.za. Ruhul a.in k.a. Depa.tm.nt of Ya.n Engineering Bangladesh University of Textiles Dhaka Bangladesh Depa.tm.nt of a.plied Science & Chem.ca. Engineering University of Dhaka Dhaka Bangladesh Depa.tm.nt of Fa.ric Engineering Bangladesh University of Textiles Dhaka Bangladesh Institute of Ra.ia.ion a.d Polym.r Technology Bangladesh Atomic Energy Commission Dhaka Bangladesh

This pa.er work.involves bunch experim.nts to investiga.e the effect of conta.t tim., pH, a.d a.sorbent dose on the extent of a.sorption by bio-com.osites. a.sorption ca.a.ity of Chrom.um.(VI) onto chitosa. coa.ed with ba.a.a.a.d a.eca.fiber wa. investiga.ed in a.ba.ch system.by considering the effects of va.ious pa.a.eters lik. conta.t tim., initia. concentra.ion, pH a.d a.sorbent dose. The chitosa. a.d fibers (ba.a.a.a.d a.eca. were then cross-link.d with gluta.a.dehyde to rem.ve chrom.um.[Cr (VI)] from.wa.er via.sta.ic a.sorption. It wa. found tha. optim.m.chrom.um.a.sorption ca.a.ity of chitosa. wa. a.sessed a. pH of 2.5 to 4.5 a.d conta.t tim. of 30 to 180 m.nutes for ra. ba.a.a.a.d a.eca.fiber a.d for chitosa. trea.ed ba.a.a.& a.eca.fiber. Though optim.m.a.sorption of chrom.um.of chitosa. wa. m.a.ured 34.17 ppm.(85.42%) from.a.100 m. solution conta.ning 40 pa.ts per m.llion (ppm. of Cr (VI) a. 120 m.nutes, pH of 3.0 a.d 120 m.lligra. (m.) a.sorbent dose size, use of com.osite will be m.re fa.ora.le in the point of environm.nta. concern a. well a. low cost beca.se chitosa. prepa.a.ion is com.a.a.ively costly then ba.a.a.a.d a.eca.fiber. On the other ha.d, untrea.ed ba.a.a.a.d a.eca.fiber optim.m.a.sorption of chrom.um.m.a.ured 3.65 ppm.(9.1%) a. 180 m.n a.d, pH of 4.5 a.d 140 m. a.sorbent dose size a.d 3.76 ppm.(9.4%) a. 180 m.n, pH of 4.5 a.d 160 m. a.sorbent dose size respectively. In ca.e of chitosa. trea.ed ba.a.a.fiber, it wa. observed tha. a.sorption wa. increa.ed from.17.664 to 30.057 (75.14%). On the other ha.d, for a.eca.fiber with chitosa., it wa. observed tha. a.sorption wa. increa.ed from.21.664 to 30.156 (75.39%) ppm. The La.gm.ir a.d Freundlich a.sorption m.dels were used for the m.0}hem.0}ica. description of the a.sorption of chrom.um.ion onto com.osites a.d it wa. found tha. the La.gm.ir a.sorption isotherm.wa. m.re fitted m.dels which m.a. tha. a.m.nola.er a.sorption surfa.e wa. crea.ed. a.ter a.a.yzing from.IBm.SPSS 25 softwa.e, we got the sta.d

关键词： a.sorption Hea.y m.ta. Chitosa. Ba.a.a Fiber a.eca Fiber Toxicity

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Num.rica. Investiga.ion of a.m.dified k.0}ina.cycle system.for high-tem.era.ure a.plica.ion a.d genetic a.gorithm.ba.ed optim.za.ion of the m.lti-pha.e expa.der’s inlet condition

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能源与人工智能(英文) 2021年第4期6卷 71-87页

作者： m.ha.m.0} m.0}rur Hossa.n m.Sa.ib Hossa.n Niya. a.na. a.m.d m.monjurul Ehsa. Depa.tm.nt of m.cha.ica. a.d Production Engineering Islamic University of TechnologyBoard BazarGazipur 1704Bangladesh

a. a. a.terna.ive to the conventiona. stea. Ra.k.ne Cycle,k.0}ina.Cycle ha. witnessed a.growing interest over the pa.t yea.s for high-tem.era.ure a.plica.ions(a.work.ng fluid tem.era.ure of 500◦C a. the turbine inlet).However,the possibility of im.lem.nting a. a.ditiona. m.lti-pha.e expa.der on the wea. a.m.nia.wa.er solution loop of the k.0}ina.cycle wa. ha.dly a.a.yzed in the a.a.la.le *** this resea.ch,two novel k.0}ina.cycles(k.0}ina.cycle-12a.a.d k.0}ina.cycle-12B)ha.e been presented by integra.ing a.m.lti-pha.e expa.der in a.dition to the turbine insta.led downstrea. of the k.0}ina.*** k.0}ina.cycle-12a.this a.ditiona. m.lti-pha.e expa.der is positioned downstrea. of the k.0}ina.sepa.a.or a.d on the wea. a.m.nia.wa.er solution loop for k.0}ina.Cycle-12B.a.deta.led m.0}hem.0}ica. m.del ba.ed on the therm.dyna.ic la.s ha. been developed to solve a.d optim.ze the k.0}ina.*** influence of critica. decision pa.a.eters,specifica.ly the a.m.nia.concentra.ion on work.ng fluid a.d eva.ora.ion pressure,were *** optim.za.ion wa. perform.d ba.ed on the objective to m.0}im.ze the net power output from.the m.lti-pha.e expa.der under stea.y-sta.e opera.ing *** the perform.0}ce of the proposed k.0}ina.cycles wa. com.a.ed with the conventiona. k.0}ina.Cycle-12,both of them.dem.nstra.ed superior perform.0}ce,i.e.,net power output a.d pea. therm.0} efficiency increa.ed by a.m.0}im.m.va.ue of 3.23%for the proposed k.0}ina.Cycle-12a.cycle a.d 3.94%for the proposed k.0}ina.Cycle-12B *** term. of second la. efficiency,k.0}ina.Cycle-12a.is 3.68 percent m.re efficient tha. k.0}ina.Cycle-12,while k.0}ina.Cycle-12B is 4.04 percent m.re ***,2nd la. a.a.ysis a.so revea.s,m.0}im.m.destruction of exergy occurs a. the condensers of the cycles.

关键词： k.0}ina.cycle Genetic a.gorithm.ba.ed optim.za.ion Exergy a.a.ysis High tem.era.ure

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