In-situ fabrication of cellulose foam HKUST-1 and surface modification with polysaccharides for enhanced selective adsorption of toluene and acidic dipeptides.

Graphical abstract Highlights • Carboxymethyl cellulose sodium (CMC) was used to in-situ synthesize foam HKUST-1. • CMC modulated HKUST-1 crystal into huge cubic shape (5.0 μm) with high surface area. • CMC embedded into foam HKUST-1 with Cu O clusters and formed a unique interface. • At P/Po ∼ 0.0026, foam HKUST-1 bared 5.2 times higher toluene uptake than MIL-101(Cr). • Chitosan modified foam HKUST-1 exhibited highest selectivity for acidic dipeptide. Abstract A green and in-situ metal-organic framework (MOF) shaping strategy was proposed to fabricate cellulose foam HKUST-1 and modify with polysaccharides for convenient adsorption applications. The obtained unique foam HKUST-1 not only maintains HKUST-1 intrinsic thermal stability and high surface area, but also exhibits unique crystal structure and interface for HKUST-1. Moreover, the surface and crystal size of foam HKUST-1s can be easily modulated with natural polysaccharides, and the crystal and novel interfaces awarded them 5.2 times higher adsorption uptake (4.52 mmol/g) for vapor-toluene than MIL-101 (Cr) under low pressure P/Po ≈ 0.0026 and high selectivity (1 0 7) for acidic/basic dipeptides EE/RR. Based on the above results, the novel foamed MOFs can be applied for volatile organic compounds (VOCs) adsorption under ambient condition and improve acidic dipeptides enrichment in liquid phase. It will play a significant role as adsorbent in practical adsorption applications. [ABSTRACT FROM AUTHOR]