煤炭转化2025，Vol.48Issue(4)：14-25,12.DOI:10.19726/j.cnki.ebcc.202504002
煤液化沥青基碳量子点的制备、复合及光催化降解性能
Synthesis,compisite and photocatalytic degradation performance of coal liquefaction pitch-derived carbon quantum dots
摘要
Abstract
Carbon quantum dots(CQDs)have garnered significant attention in the fields of photocatalysis,electrocatalysis and bioimaging owing to their advantages,including simple synthesis methods,excellent biocompatibility,and tunable emission bandgaps.However,the preparation of CQDs often involves costly carbon sources or complicated synthesis procedures,leading to high pro-duction costs.In this study,coal liquefaction pitch(CLP)was utilized as a carbon source,and CQDs were successfully synthesized via a green chemical oxidation method using H2O2 as the oxidant.The influence of various preparation conditions on the optical properties of CQDs was systematically inves-tigated,and a comprehensive analysis of the structural and optical characteristics of the synthesized CQDs was conducted.Finally,the prepared CQDs were incorporated into Bi2WO6 composites for efficient photocatalytic degradation of Rhodamine B(RhB).The samples were systematically charac-terized using elemental analysis,steady-state/transient fluorescence spectroscopy,Fourier-transform infrared spectroscopy(FTIR),1Hliquid-state nuclear magnetic resonance(NMR),X-ray diffraction(XRD),transmission electron microscopy(TEM),and photocatalytic reaction tests.The results demonstrate that high-fluorescence CQDs were successfully prepared under optimized conditions(oxi-dation temperature:80 ℃,the volume ratio of H2O2 to H2O:3∶10,reaction time:10 h),achieving a fluorescence quantum yield of 1.75％.UV-Vis spectroscopy reveales a distinct absorption peak at 320 nm,with strong yellow-green fluorescence emission under 365 nm excitation.TEM analysis shows well-dispersed CQDs with an average particle size of 3.284 nm and a lattice spacing of 0.215 nm,corresponding to the(110)plane.XRD analysis indicates a contraction in interlayer spacing com-pared to standard graphite(002,d=0.321 nm),with diffraction peaks shift to 27.7° and 40.9°(2θ),suggesting oxygen-functionalization-induced structural distortion and partial sp3 hybridization.1H NMR confirmes the retention of CLP's polycyclic aromatic structure(aromatic protons at chemical shift of 7-8)alongside oxidation-derived modifications(conjugated C=O adjacent protons at chemical shift of 5-6).The CQDs were composited with Bi2WO6 via a hydrothermal method.The resulting CQDs/Bi2WO6 composite demonstrates excellent photocatalytic performance,achieving over 95％degradation of RhB within 60 min of irradiation.Optimal catalytic performance towards RhB is observed with a CQD loading of 5 mL.Furthermore,the composite maintains a degradation efficiency exceeding 85％after three consecutive recycling cycles,indicating good stability.Com-pared with other CQDs composite materials,it reduces the cost while maintaining certain catalytic per-formance.关键词
煤液化沥青/碳量子点/化学氧化/光催化性能Key words
coal liquefaction pitch/carbon quantum dots/chemical oxidation/photocata-lytic performance分类
化学化工引用本文复制引用
刘金昌,向玲,柳乔,陈思远,邵毅,迟睿,梁鼎成,解强..煤液化沥青基碳量子点的制备、复合及光催化降解性能[J].煤炭转化,2025,48(4):14-25,12.基金项目
国家自然科学基金青年科学基金资助项目(22008254)和中央高校基本科研业务费专项资金资助项目(2023ZKPYHH02). （22008254）
