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Modifikuoto alginato taikymo naujų vandens teršalų sorbcijai tyrimas

Investigation of modified alginate for sorption of emerging water pollutants
Authors: Gustaitė, Goda;

Modifikuoto alginato taikymo naujų vandens teršalų sorbcijai tyrimas

Abstract

The research project of emerging water pollutants consists of four main stages: fabrication of alginate beads, modification of beads, sorption investigation and UV – Vis spectrophotometric analysis. Four types of alginate beads were used for sorption study: 3% calcium alginate beads, 3% calcium alginate beads with 2g of activated carbon, 3% calcium alginate beads with 2g of silica gel, 3% calcium alginate beads with 1g of activated carbon and 1g of silica gel. Methylene blue dye and antibiotic tetracycline at concentrations of 10 mg/L; 7,5 mg/L; 5 mg/L; 2,5 mg/L were used for sorption study. Sorption was monitored for 180 minutes. After the experiment adsorption capacity and adsorption kinetics equilibrium istotherms were investigated. After analyzing the obtained results, determined that alginate beads fitted well to Freundlich isotherm. The maximum sorption capacity of designed system with methylene blue dyes was found to be 29,10 mg/g of calcium alginate beads encapsulated with active carbon, which is 10,5 times higher as compered to calcium alginate beads. In the study of tetracycline, the maximum sorption capacity was found to be 28,13 mg/g of calcium alginate beads modified with activated carbon and it was 25 times higher as compared to not modified beads. However, calcium alginate beads encapsulated with silica gel enhanced sorption capacity only 10 %. Adsorption kinetics were fitted to pseudo–second–order kinetic model. The highest adsorption reaction rate was found at the highest (10 mg/L) initial pollutant concentration with calcium alginate beads encapsulated with activated carbon. The lowest values of sorption rate were obtained for calcium alginate beads at lowest 2,5 mg/L initial solution concentration.

Vandens teršalų sorbcijos tyrimą sudaro keturi pagrindiniai etapai: alginato granulių gamyba, granulių modifikavimas, sorbcijos tyrimas ir UV-VIS spektrofotometrinė analizė. Sorbcinių savybių tyrimui naudojamos modifikuotos keturių rūšių alginato granulės: 3% kalcio alginato granulės, 3% kalcio alginato granulės su 2g aktyvintosios anglies priedu, 3% kalcio alginato granulės su 2g silikagelio priedu ir 3% kalcio alginato granulės su 1g aktyvintosios anglies ir 1g silikagelio priedais. Tyrime palyginimui naudojami du vandens teršalai – metileno mėlyno dažas ir antibiotikas tetraciklinas, kurių koncentracijos vandenyje yra 10 mg/L; 7,5 mg/L; 5 mg/L; 2,5 mg/L. Sorbcija stebima 180 minučių, pagal gautus duomenis apskaičiuojama sorbcinė geba ir reakcijų greičiai. Išanalizavus gautus rezultatus nustatyta, kad metileno mėlyno ir tetraciklino sorbcijai modifikuotomis alginato granulėmis aprašyti labiau tinkamas Freundlicho adsorbcijos pusiausvyros modelis. Geriausia sorbcinė geba su metileno mėlyno tirpalu nustatyta kalcio alginato granulių su aktyvintosios anglies priedu – 29,10 mg/g, granulių be priedų sorbcinė geba buvo 10,5 karto mažesnė. Didžiausia sorbcinė geba su tetraciklinu buvo taip pat kalcio alginato granulių su aktyvintosios anglies priedu – 28,13 mg/g, o be priedų 25 kartus mažesnė. Silikagelio priedas abiejų teršalų sorbciją pagerino tik apie 10 %. Reakcijų kinetikai aprašyti buvo taikomos pseuo II laipsnio kinetinės lygtis, pagal kurias nustatyta, kad adsorbcijos greitis buvo didžiausias prie aukščiausios (10mg/L) tirpalo koncentracijos. Maksimalus adsorbcijos greitis buvo pasiektas naudojant kalcio alginato granules su aktyvintąja anglimi, o lėčiausiai sorbcija vyko su kalcio alginato granulėmis be priedų.

Country
Lithuania
Related Organizations
Keywords

adsorbcija, adsorption, beads, nauji vandens teršalai, kalcio alginatas, emerging water pollutants, calcium alginate, granulės

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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