▎ 摘　　要

NOVELTY - Preparation of sea squirt nano-cellulose-base aerogel involves: (1) cleaning sea squirt tunicate, soaking in 5-10 wt.% alkaline solution for 8-12 hours, and washing tunicate with deionized water to neutral; (2) bleaching tunicate with a bleaching solution for 6-10 hours, replacing fresh bleaching solution every 2 hours, and washing to obtain sea squirt cellulose; (3) hydrolyzing sea squirt cellulose with acid, adding excess deionized water to terminate reaction, centrifuging, and dialyzing with deionized water until the pH of solution becomes neutral to obtain TCNCs; (4) dispersing TCNCs into a cellulose nanocrystal suspension, adjusting pH to neutral, and mixing 1-10 wt.% TCNCs suspension with 10-30 wt.% sepiolite (SP), 1-10 wt.% graphene oxide (GO) and 1-10 wt.% glutaraldehyde to form a mixed suspension; (5) ultrasonically processing and degassing the suspension to obtain a mixture; and (6) freeze-drying to obtain TCNCs/SP/GO aerogel. USE - Preparation of flame-retardant and heat-insulating sea squirt nano-cellulose-base aerogel (claimed). ADVANTAGE - The method: is simple, environmentally-friendly and suitable for mass production; and uses wide sources of naturally renewable and biodegradable TCNCs as precursor, cheap, non-toxic and harmless SP nanoclay and carbon material GO with excellent performance to prepare aerogel, which has excellent biocompatibility, porosity, flame retardance and heat insulation property, high specific surface area, and low thermal conductivity. The method broadens the application of TCNCs in the field of biomass flame retardant material.