CAJ | 학술논문

本研究先采用滴涂法制备了多壁碳纳米管修饰电极,然后采用电化学沉积技术从含有氧化石墨烯的溶液中制备了石墨烯(GR)/多壁碳纳米管(MWCNT)复合膜修饰电极(GR/MWCNT/GCE)。研究了亚硝酸根( NO2-)在该修饰电极上的电化学行为。结果表明,该修饰电极对亚硝酸根的电氧化具有高的催化活性。在pH 7．00的PBS缓冲溶液中,微分脉冲伏安法测定亚硝酸根的线性范围为1．0×10-7 mol·L-1~1．7×10-3 mol· L-1,检出限为5．0×10-8mol·L-1(S/N=3)。用该法测定了土壤中亚硝酸根的含量,结果令人满意。
본연구선채용적도법제비료다벽탄납미관수식전겁,연후채용전화학침적기술종함유양화석묵희적용액중제비료석묵희(GR)/다벽탄납미관(MWCNT)복합막수식전겁(GR/MWCNT/GCE)。연구료아초산근( NO2-)재해수식전겁상적전화학행위。결과표명,해수식전겁대아초산근적전양화구유고적최화활성。재pH 7．00적PBS완충용액중,미분맥충복안법측정아초산근적선성범위위1．0×10-7 mol·L-1~1．7×10-3 mol· L-1,검출한위5．0×10-8mol·L-1(S/N=3)。용해법측정료토양중아초산근적함량,결과령인만의。
A graphene and multi-walled carbon nanotubes composite film modified electrode( GR/MWCNT/GCE) was fabricated by two steps method. Firstly,a multi-walled carbon nanotubes film modified electrode( MWCNT/GCE) was fabricated by using dipping method. Then GR/MWCNT/GCE composite film modified electrode was prepared with electrochemical deposition technique from a graphene oxide containing solution. The electrochemical behavior of nitrite on this modified electrode was investigated carefully. The results showed that the resulting modified electrode exhibited excellent electrocatalytic activity toward the electrooxidation of ni-trite. Under the optimal conditions,the linear range for determination of nitrite by DPV was 1. 0×10-7mol·L-1 ~1. 7×10-3mol·L-1 with the detection limit of 5. 0×10-8mol·L-1(S/N=3). The proposed method was applied to detect nitrite in real samples with satis-factory results.