Continuously enhanced versatile nanocellulose films enabled by sustaining CO 2 capture and in-situ calcification.

Cellulose possesses numerous favorable peculiarities to replace petroleum-based materials. Nevertheless, the extremely high hygroscopicity of cellulose severely degrades their mechanical performance, which is a major obstacle to the production of high-strength, multi-functional cellulose-based materials. In this work, a simple strategy was proposed to fabricate durable versatile nanocellulose films based on sustaining CO ₂ capture and in-situ calcification. In this strategy, Ca(OH) ₂ was in-situ formed on the films by Ca ²⁺ crosslinking and subsequent introduction of OH ^- , which endowed the films with high mechanical strength and carbon sequestration ability. The following CO ₂ absorption process continuously improved the water resistance and durability of the films, and enabled them to maintain excellent mechanical properties and promising light management ability. After a 30-day CO ₂ absorption process, the water contact angle of the films can be increased from 43° to 79°, and the weight gain rate of the films in a 30 h water-absorption process can be sharply decreased from 331.2 % to 52.2 %. The films could maintain a high tensile strength of 340 MPa, and result in a CO ₂ absorption rate of 3.5 mmol/g _cellulose after 30 days. In this study, the improvement of durability and carbon sequestration of nanocellulose films was achieved by a simple and effective method.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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