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Owing to the high specific surface area and lightweight, aerogels exhibit excellent adsorption capacity that can be tailored for the fabrication of high‐performance environmental purification materials. Cellulose nanocrystal (CNC) is an abundant, bio‐based, low‐density one dimensional (1D) nanomaterials with high‐respect ratio. In this work, CNC is first chemically grafted with polyethylenimine (PEI) and further by β‐cyclodextrin (β‐CD), which is subsequently crosslinked by polyacrylamide (PAM) to prepare the composted aerogel (CNC‐PEI‐CD/PAM), and being endowed high‐adsorption capacity for methyl orange (MO) (155.93 mg g−1) and removal rate (97.46%). Our unique strategy overcomes the low graft efficiency of β‐CD directly onto CNC by connecting PEI. Besides, CNC‐PEI‐CD/PAM not only shows superior adsorption performance to methyl orange, attributing to the unique "selective" cavity structure of β‐CD and dense surface charge of PEI, but also displays the desired reusability. This material shows the huge potential in water purification. [ABSTRACT FROM AUTHOR]

2D transition-metal carbide/nitride (MXene)-based conductive inks have received tremendous attention due to their high electrical conductivity and other fascinating properties. However, the unstability of MXene-based inks, low fabrication yield of MXene flakes, and poor mechanical properties of printed products strongly limit the proper and large-scale printing of MXene patterns. Here, functioning as a dispersant, an intercalation agent, and reinforcement, sulfated holocellulose nanofibrils (HCNFs) with a unique "core-shell" structure are conducive to the fabrication, storage, and subsequent printing of MXene inks. The MXene/HCNF (MH) ink with high yield (97.2%), good stability, and good homogeneity exhibits excellent printing performance (high resolution and good coverage). It could print various products with adjustable thicknesses and electrical conductivity properties on different substrates. The products printed by the MH ink can be applied as multifunctional sensing materials responding to multiple external stimuli, such as stress/strain, blowing, humidity, and temperature. Furthermore, the resulting products also display a high electromagnetic interference (EMI) shielding effectiveness (SE) of 54.3 dB at a shallow thickness of 100 μm and an excellent specific EMI SE of SSE/ t of 7159 dB cm 2 g -1 .