Journal
CHEMICAL ENGINEERING JOURNAL
Volume 455, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.140387
Keywords
Hybrid aerogels; Zr-MOF; Green matrix; Adsorption; Dimethylarsinate
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This study compared the effect of three matrices on the removal of DMA from water to NU-1000 hybrid aerogels. The NU-1000@AG hybrid aerogel showed the highest adsorption capacity for DMA, while the NU-1000@CMC and NU-1000@SA hybrid aerogels had lower adsorption capacities due to interference from functional groups. The NU-1000 hybrid aerogels demonstrated excellent regeneration performance and solid-liquid separation efficiency.
This study compared the effect of three matrices on the dimethylarsinate (DMA) removal from water to NU-1000 (zirconium-based metal-organic framework, Zr-MOF) hybrid aerogels. The porous MOF hybrid aerogels were prepared by grafting NU-1000 into green matrices, i.e., agarose (AG), sodium alginate (SA), and carboxymethyl cellulose (CMC) sodium salt. The adsorption data of DMA can be well described by the pseudo-second-order kinetic model and the Freundlich isotherm model. The maximum adsorption capacity of the NU-1000@AG hybrid aerogel for DMA (119.63 mg/g) was higher than the other two hybrid aerogels due to the negligible interference of AG on the active adsorption sites in NU-1000. However, the functional groups in NU-1000@CMC hybrid aerogel and NU-1000@SA hybrid aerogel occupied the Zr adsorption sites during the cross-linked process and decreased their adsorption capacities. The NU-1000@AG hybrid aerogel demonstrated application potential for removing DMA in a fixed-column dynamic adsorption process. Furthermore, the NU-1000 hybrid aerogels exhibited excellent regeneration performance and ease of solid-liquid separation. The characteristics of various matrices may offer diversified facile and viable strategies for fabricating a blocky adsorbent with superior sta-bility and solid-liquid separation efficiency for water treatment, overcoming the disadvantages of MOF powder and ensuring maximum effectiveness of adsorbent components.
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