Sodium bromide (NaBr) (Guangdong Guanghua Chemical Factory Co., Ltd., China), 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO, 98%), (J&K Scientific Ltd, Shanghai, China), and ten mass % (10 wt%) sodium hypochlorite (NaClO) solution (Tianjin Dingshengxin Chemical Industry Co., Ltd., China). Other chemicals were analytical grades and were used without prior purification. Cellulose wood pulp (Shandong Sun Paper Industry Joint Stock Co., Ltd., Jining, China) was used as the original cellulose sample.
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