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纳米纤维素具有极大的比表面积和良好的反应性能,可广泛应用于环境保护领域。本论文以纳米纤维素纤维(Cellulose Nanofibers,CNFs)为原料,经过化学改性制备了羧基化纳米纤维素(Carboxylated CNFs,C-CNFs)和氨基化纳米纤维素(Amino CNFs,A-CNFs)。在pH=5.5时,C-CNFs对于Pb~(2+)的吸附量最大为395mg/g,经过酸洗脱再生效率达到96%。在p H=4.5时,A-CNFs对Cr~(6+)的吸附量最大为103mg/g,经过碱洗脱再生效率达到93%。作为吸附剂,两种改性纳米纤维素均符合朗缪尔等温吸附模型,说明对金属离子的吸附为单分子层吸附。
Nano-cellulose has a very large specific surface area and good reactivity, can be widely used in the field of environmental protection. In this dissertation, Carboxylated CNFs (C-CNFs) and Amino CNFs (A-CNFs) were prepared by chemical modification of cellulose nanofibers (CNFs). At pH 5.5, the adsorption capacity of Pb 2+ for C-CNFs was 395 mg / g, and the efficiency of acid-eluting regeneration was 96%. At p H = 4.5, the adsorption capacity of A-CNFs to Cr 6+ was up to 103 mg / g, and the efficiency of A-CNFs was 93% after alkaline elution. As adsorbents, both modified nanocellulose are in line with Langmuir Isothermal adsorption model, indicating that the adsorption of metal ions is monolayer adsorption.