การศึกษาประสิทธิภาพการดูดซับแคดเมียมของตัวดูดซับชีวภาพที่ได้จากการตรึงชีวมวลสาหร่ายทะเลสีน้ำตาล Sargassum polycystum ด้วยไคโตซานในระบบคอลัมน์

Study of Column Performance of Biosorbent from Immobilization of Sargassum polycystum in Chitosan Matrix for Cadmium Removal

Name: ณรงค์ศักดิ์ โควิ

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Biosorbent

; Chitosan

; Sargassum polycystum

; Immobilization

; Cross Linked

; Pack Bed Column

; Protonation

; Adsorption Model

; Breakthrough Time

Abstract: The biosorption of cadmium ions in the synthetic solution was studied by using ofbiosorbents prepared from chitosan and the brown marine algae, Sargassum polycystum.Six types of biosorbents were prepared and used to determine the effect of crosslinkagent concentration and the immobilized percentage of algae in chitosan matrix. Noncross-linked chitosan sorbent showed a good sorption ability at the high pH (6.35mgCd/g at pH 7.0). The results indicated that at low pH, amino groups in chitosan structurewere protonated resulting in the reduction of Cd sorption capacity. Cross-linkedchitosan sorbents gave a low uptake capacity at pH 7. This result indicated that aminogroups in chitosan structure play a major role in sorption mechanism because the freeamino groups in the chitosan structure were lost due to the aldimine linkage betweenCH = N in crosslink reaction. In immobilized adsorbent, higher adsorption capacity wasfound at lower pH. This result indicated that the sorption capacity was due to theimmobilized algae since the sorption of dry biomass of algae is preferred at lower pHvalues. The highest Cd adsorption capacity (104.03 mg Cd/g) of the immobilized (with4% wt algae) adsorbent (with 4% wt algae) was found at pH 4.0.Pack bed column experiments were carried out with immobilized adsorbent with 4% wtalgae using Cd solution of pH 4.0. The results showed longer breakthrough time wasobtained when a lower flow rate and a higher bed depth column were used. The resultsof the regeneration experiments showed that the packed adsorbent column could beregenerated up to 4 times. The experimental breakthrough curves were compared withthe result of a column adsorption model. At all flow rates, the results of the model fittedwell with the experimental breakthrough curves when the 1 cm bed depth column wasused. When higher bed depth columns were used, the results of the model deviated fromthe experimental breakthrough curves. The shapes of the breakthrough curves of theexperiments with higher bed depth indicated the effect of the channeling flow inside thebed. A column adsorption model was used to demonstrate the design of an adsorptioncolumn using a prepared immobilized algae cross-linked chitosan beads. The simulationwas performed using 2 m diameter column with 1 m bed depth and the flow rate and theconcentration of Cd solution of 100 l/hr and 10 mg/l Cd, respectively. The breakthroughtime of 200 hours was obtained from this simulation.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: Asst.Prof. Anan Tongta

Role: Supervisor

Created: 2545

Issued: 2005-10-11

Modified: 2006-05-10

วิทยานิพนธ์/Thesis

ISBN: 9749636244

CallNumber: BIT440

tha

DegreeName: วิทยาศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: เทคโนโลยีชีวภาพ

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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