Comparative study of calcium alginate, ball-milled biochar, and their composites on aqueousmethylene blue adsorption

被引：82
作者：
Wang, Bing [1 ,2 ,3 ]
Gao, Bin [2 ]
Wan, Yongshan [4 ]
机构：
[1] Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Guizhou, Peoples R China
[2] Univ Florida, Dept Agr & Biol Engn, Gainesville, FL 32611 USA
[3] Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Puding Karst Ecosyst Res Stn, Puding 562100, Peoples R China
[4] US EPA, Natl Hlth & Environm Effects Res Lab, Gulf Breeze, FL 32561 USA
来源：
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2019年 / 26卷 / 12期
基金：
美国国家科学基金会;
关键词：
Ball mill; Biochar; Sodium alginate; Methylene blue; Wastewater; Adsorption; LOW-COST ADSORBENT; METHYLENE-BLUE; AQUEOUS-SOLUTION; ACTIVATED CARBON; DYE REMOVAL; KINETICS; BEADS; WATER; SOIL; THERMODYNAMICS;
D O I：
10.1007/s11356-018-1497-1
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this work, a novel composite, ball-milled biochar (BMB) encapsulated in calcium-alginate (CA) beads (CA-BMB), was synthesized as an alternative adsorbent for the removal of methylene blue (MB) from an aqueous solution. Sorption performance was compared among CA, BMB, and CA-BMB composite with batch adsorption experiments. With 25% BMB and 75% alginate, the new composite resembled CA in MB adsorption. With an initial MB concentration of 50mgL(-1), kinetics studies showed that 74% MB removal by CA-BMB was achieved within 8h, followed by slow kinetics reaching 91% removal in 16h. The adsorption kinetics was well explained by the Ritchie's kinetic model, indicative of energetically heterogeneous solid surface of the composite. Adsorption isotherms of BMB, CA, and CA-BMB can all be fitted with the Langmuir models; the adsorption capacity of CA-BMB (1210.7mgg(-1)) was close to that of CA (1282.2mgg(-1)) and much higher than that of BMB alone (184.1mgg(-1)). The outstanding adsorption performance suggested that CA-BMB can serve as a low-cost and eco-friendly adsorbent for MB removal from an aqueous solution.
引用
收藏
页码：11524 / 11530
页数：7
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