期刊
CHEMICAL ENGINEERING JOURNAL
卷 457, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.141331
关键词
?-Cyclodextrin-based nanocubes; Dyeing wastewater treatment; Selective adsorption; Recyclability
This study fabricated eco-friendly beta-cyclodextrin based nanocubes (cl-CD@CA) as adsorbents to treat textile dyeing effluents. The prepared cl-CD@CA showed high adsorption capacity towards various dye ions, with exceptional selectivity towards cationic dyes. Furthermore, cl-CD@CA exhibited excellent recyclability and demonstrated high adsorption capacity for actual dyeing wastewater, effectively reducing COD and heavy metal concentrations.
Water contamination caused by the discharge of textile dyeing wastewater is a thorny issue that cannot be ignored nowadays. In this work, eco-friendly beta-cyclodextrin based nanocubes (cl-CD@CA) with low cost and exceptional adsorption capacity were fabricated by a facile method to treat textile dyeing effluents. The prepared adsorbents showed high water insolubility and extraordinary adsorption capacity towards methylene blue, crystal violet, neutral red, Pb2+, Cd2+, and Sb3+ ions with corresponding maximum adsorption capacity of 1523.6, 1012.2, 419.2, 758.7, 525.3, and 398.1 mg/g, much higher than that of some other adsorbents. The adsorption kinetic and isotherm studies indicated that the adsorption process of cl-CD@CA fit pseudo-secondorder adsorption kinetic model and Langmuir isotherm model well, manifesting its monolayer chemisorption. Remarkably, the cl-CD@CA, presenting high selective adsorption toward cationic rather than anionic dyes, was potential for mixed dye separation. Moreover, the cl-CD@CA maintained excellent recyclability after 10 regeneration cycles. Excitingly, cl-CD@CA exhibited high static and dynamic adsorption capacity for actual dyeing wastewater, with a 79.3 % reduction in COD and 95 %, 29 % and 16 % concentration reduction of Pb2+, Cd2+ and Sb3+. Therefore, the newly developed lost-cost yet high-efficiency cl-CD@CA can serve as promising adsorbents to alleviate the water pollution caused by dyeing wastewater.
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