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원성욱,한민희,최순범,전유철,조철웅,정봉우,윤영상 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
The amino acid fermentation process residue, Corynebacterium glutamicum biomass, was used as a biosorbent to remove Reactive Blue 4. This study was performed in batch and fixed-bed column systems. The dye was effectively removed at pH 1 - 3 in batch tests. The initial slope of isotherm curve was steep, indicating that the biomass affinity for the dye molecules is high. The Langmuir isotherm was used to describe the dye binding capacity of the biomass. The performance of fixed-bed column, containing particles of C. glutamicum biomass, was evaluated using 300 mg/L dye solutions at flow rates of 0.31 and 0.71 ml/min. The breakthrough volume was increased with decreased flow rate. Therefore, the fermentation byproduct was considered to be recycled as a dye sorbent.
Dye biosorption from an aqueous solution by Corynebacterium glutamicum biomass
원성욱,최순범,윤영상 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
본 연구는 Corynebacterium glutamicum biomass를 이용하여 Reactive Orange 16, Reactive Blue 4, Reactive Yellow 2, Reactive Red 4, Methylene Blue, Disperse Orange 11에 대한 흡착실험을 하였다. 반응성 염료는 pH 1∼3에서 최적 pH를 갖으며 500 mg/l이하의 농도에서는 90∼95%의 흡착률을 보였다. 그러나 Methylene Blue는 pH 변화에 상관없이 거의 흡착이 이루어지지 않았으며 Disperse Orange 11은 단지 Methylene Blue보다 조금 더 많은 양이 흡착되었다. 이는 C. glutamicum biomass의 표면이 양이온을 띠고 있고 반응성 염료는 음이온을 띠어 서로 잘 반응하여 흡착이 쉽게 이루어 지는것으로 보인다. Methylene Blue는 양이온을 띠고 Disperse Orange 11은 이온을 띠지 않아 biomass와 거의 반응하지 않는 것으로 생각되어 진다. 그리고 반응성 염료는 pH 6∼8에서 거의 95%가 탈착되었다. 결론적으로 C. glutamicum biomass는 반응성 염료에 대해 높은 흡/탈착률을 보이므로 반응성 염료와 같이 음이온을 띠는 염료를 제거하는 흡착제로써 잠재적 가치가 매우 클 것으로 기대된다.
On the reason why acid treatment of biomass enhances the biosorption capacity of cationic pollutants
원성욱,YEOUNG-SANG YUN,Sun Beom Choi 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.1
The present work is aimed at understanding the effect of acid treatment and demonstrating the reason for its effect. For this, Corynebacterium glutamicum biomass was used as a model biomass. Two cationic (cadmium and Methylene Blue) and one anionic (Reactive Red 4) pollutants were used to evaluate the sorption capacity by the biomass. Isotherm experiments showed that acid treatment of the biomass increased the uptake of the cationic pollutants, but decreased that of the anionic pollutant. Through the results of FTIR and potentiometric titrations, it was found that carboxyl groups on the biomass increased after acid treatment. The carboxyl groups seem to be generated likely through hydrolysis of esters in the biomass under the acidic condition. Therefore, increase of the carboxyl groups provided the binding sites for cationic pollutants, whereas it may interfere with the binding of anionic pollutants.