摘要
在乙二醇中,以聚乙烯吡咯烷酮(PVP)为分散剂,抗坏血酸(VC)为还原剂和抗氧化剂,还原CuSO4制得铜胶体溶液。通过XRD、UV-Vis与共振光散射(RLS)光谱对铜胶体进行表征。结果表明,铜胶体为面心立方晶体结构的0价铜,在592～602 nm呈现典型的等离子共振吸收峰,体系具有明显的RLS特征,最大散射波长在468 nm。考察了反应条件、体系的稳定性与共存离子对乙二醇中铜胶体RLS的影响。结果表明,适宜的反应条件为:试剂按照VC、CuSO4和PVP的加入顺序,3种物质量的比按照n(VC)/n(Cu2+)=15、n(PVP-K30)/n(Cu2+)=1.4;反应温度60℃;反应时间1 h,反应得到的铜胶体可稳定放置1 d。在适宜条件下,ρ(Cu2+)在5.12～12.8 mg/L范围内与散射光强度(ΔIRLS)成正比,回归方程为ΔI=7420.2ρ-631.8(r=0.9962),检出限(3σ)为0.63μg/L。0.64 mg/L MnSO4、CdSO4和ZnSO4,1.28 mg/L KI,64 mg/L Na2 CO3和Ca(OH)2,960 mg/L CH3CH2OH,640 mg/L CH3OH和320 mg/L CH3CH2CH2OH均不干扰10 mg/L Cu2+溶液的测量。由此建立一种利用RLS光谱测定乙二醇中铜离子的简便方法。
Copper colloids were synthesized in ethylene glycol by using ascorbic acid（VC） as the reducing agent and polyvinyl pyrrolidone（PVP） as the dispersant.The as-prepared copper colloids were characterized by XRD,UV-Vis and resonance light scattering（RLS）.Face-centered cubic Cu（0） particles were formed,which displayed resonance light scattering（RLS） spectra with a typical plasma resonance absorption within the range of 592~602 nm and the maximum scattering wavelength at 468 nm.The RLS results show that the favorable reaction conditions are in the addition order of VC,CuSO4 and PVP under n（VC）/n（Cu2＋）=15,n（PVP-K30）/n（Cu2＋）=1.4,temperature=60 ℃,and incubating for 1 h.The obtained copper colloids are stable for 24 h.Under such reaction conditions,the scattering intensity（ΔIRLS） is proportional to Cu2＋ content in the range of 5.12~12.8 mg/L with the detection limit of 0.63 μg/L（3σ）,and the regression equation is ΔI=7420.2ρ-631.8（r=0.9962）.When the concentration of Cu2＋ solution is 10 mg/L,the colloidal system is stable for 24 h.Foreign substances such as 0.64 mg/L MnSO4,CdSO4 and ZnSO4,1.28 mg/L of KI,64 mg/L of Na2CO3 and Ca（OH）2,960 mg/L CH3CH2OH,640 mg/L CH3OH and 320 mg/L CH3CH2CH2OH had no interference.Therefore,a simple method to detect the Cu2＋ in ethylene glycol is established using the RLS spectra.
出处
《应用化学》
CAS
CSCD
北大核心
2011年第10期1213-1217,共5页
Chinese Journal of Applied Chemistry
基金
重庆市教委科技基金资助项目(KJ101215)
重庆市科技攻关项目(CSTC
2010AC7136)
重庆高校创新团队(201042)
关键词
铜胶体
共振光散射
抗坏血酸
copper colloids
resonance light scattering
ascorbic acid
作者简介
通讯联系人：韩涛，讲师；Tel／Fax：023-49682200；E-mail：danbaiht@126．com；研究方向：微、纳米功能材料
