Efficiency of air-dried and freeze-dried alginate/xanthan beads in batch, recirculating and column adsorption processes

被引：11
作者：
Kondaveeti, Stalin [1 ,2 ]
Petri, Denise F. S. [1 ]
Jeong, Hoon Eui [2 ]
机构：
[1] Univ Sao Paulo, Inst Quim, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo, Brazil
[2] Ulsan Natl Inst Sci & Technol UNIST, Dept Mech Engn, Ulsan 44919, South Korea
来源：
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES | 2022年 / 204卷
基金：
巴西圣保罗研究基金会;
关键词：
Sodium alginate; Xanthan gum; Beads; Freeze-drying; Methylene blue; Adsorption; METHYLENE-BLUE ADSORPTION; MANGOSTEEN PEEL WASTE; AQUEOUS-SOLUTION; REMOVAL; DYE; ADSORBENTS; NANOCOMPOSITE; KINETICS; CHITOSAN;
D O I：
10.1016/j.ijbiomac.2022.02.011
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
Alginate (Alg) beads are low-cost adsorbents used for wastewater remediation. In this work, alginate (Alg) and alginate/xanthan (Alg/XG) blend beads were synthesized by gelation method into calcium chloride and freezedried to improve the porosity. Their adsorption efficiency was tested for methylene blue (MB) dye in batch, recirculating and column adsorption systems. The blend beads were characterized using by SEM, FTIR-ATR and X-ray microcomputer tomography (Micro-CT) analyzes. Freeze-dried Alg and Alg/XG beads presented porosity of 46 +/- 5% and 77 +/- 3%, respectively. Adsorption isotherms of MB on freeze-dried Alg/XG beads indicated better adsorption capacity in comparison to the air-dried ones. Adsorption kinetics and breakthrough curves based on recirculating and vertical column adsorption processes of MB on freeze dried Alg/XG and air-dried Alg/XG beads indicated higher efficiency for the vertical column system packed with freeze dried Alg/XG beads. The removal efficiency of 91% MB by the freeze-dried Alg/XG beads in vertical column remained even after four consecutive adsorption-desorption cycles, disclosing these beads as potential systems for the wastewater treatment.
引用
收藏
页码：345 / 355
页数：11
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