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本文以氧化石墨烯/壳聚糖(GO/CHS)水凝胶为载体,原位还原氯金酸,制备纳米金/氧化石墨烯/壳聚糖水凝胶(AuNPs/GO/CHS)。运用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电镜(SEM)和比表面及孔隙度分析对AuNPs/GO/CHS进行表征。以NaBH4为供氢体,考察了由不同脱乙酰度和分子量的壳聚糖制备的AuNPs/GO/CHS对4-硝基苯酚(4-NP)催化还原性能的影响,优化了催化反应条件。结果表明,GO提高了AuNPs的催化活性,AuNPs/CS和AuNPs/GO/CS对4-NP催化还原满足伪一级反应动力学,速率常数分别为0.0270和0.1570min-1,反应30min时,转化率分别为55.7%和93.7%。低脱乙酰度和低分子量壳聚糖制备的催化剂具有更高的4-NP催化反应活性。30℃反应30min,以脱乙酰度64%的壳聚糖制备的AuNPs/GO/N2为催化剂对4-NP的转化率可达97.7%,反应速率常数可达到0.2309min-1,反应活化能Ea为37.2kJ·mol-1。
Abstract：Gold nanoparticles/graphene oxide/chitosan(GO/CHS) hydrogels(AuNPs/GO/CHS) were prepared by in situ reduction of chloroauric acid using graphene oxide/chitosan(GO/CHS) hydrogels as the carrier. X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FT-IR), scanning elec-tron microscopy(SEM), and specific surface and porosity analyses were used to characterize AuNPs/GO/CHS. The effect of AuNPs/GO/CHS prepared from chitosan with different degrees of deacetyla-tion and molecular weights on the catalytic reduction of 4-nitrophenol(4-NP) was investigated using NaBH4 as a hydrogen donor.The results showed that GO improved the catalytic activity of AuNPs, and the catalytic reduction of 4-NP by AuNPs/CS and AuNPs/GO/CS satisfies the pseudo-primary reaction kinetics with rate constants of 0.027 0 and 0.157 0 min-1, respectively, and conversions of 55.7% and 93.7% at 30 min of reaction. The low-deacetylation degree and low molecular weight chitosan-prepared catalysts with low deacetylation degree and low molecular weight chitosan had higher 4-NP catalytic ac-tivity. When AuNPs/GO/N2 prepared from chitosan with a deacetylation degree of 64% was used as the catalyst, the conversion of 4-NP could reach 97.7% with a rate constant of 0.230 9 min-1 and an activation energy Ea of 37.2 k J·mol-1 for 30 min at 30 ℃. The catalysts with a low deacetylation de-gree and low molecular weight had higher 4-NP catalytic activity.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20250101
中图分类号:X703;O643.36;TQ427.26
引用信息:
[1]束召芹,李瑾,刘冰冰,等.纳米金/氧化石墨烯/壳聚糖水凝胶的制备及其催化还原4-硝基苯酚的性能研究[J].中国海洋大学学报(自然科学版),2026,56(03):108-118.DOI:10.16441/j.cnki.hdxb.20250101.
基金信息:
山东省自然科学基金项目(ZR2021ME153)资助~~
2026-02-10
2026-02-10