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Silicon quantum dots-based fluorescent sensor for the detection of cobalt with high sensitivity and selectivity

Chinese Chemical Letters 2024年第1期35卷 451-455页

作者： Ebtihaj Mohammed Sullam Khalid Mohammed Adam Juanjuan Liu Hongli Chen Jianxi Xiao State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China Department of Chemistry Faculty of EducationUniversity of KordofanEl Obeid 51111Sudan

Fluorescent silicon quantum dots(Si QDs)were hydrothermally synthesized from a mixture of 3(2-aminoethylamino)propyl(dimethoxymethylsilane)(AEAPDMMS)and poly(vinylpyrrolidine)(PVP).The resulting Si QDs exhibited good water solubility and high stability.Under the optimized conditions,the probe revealed an excellent linear fluorescence quenching effect on Co2+ranging from 1μmol/L to 120μmol/L with a limit of detection of 0.37μmol/L(based on 3 s/k).The quenching mechanism was studied,showing that static quenching(SQE)causes the main effect.Furthermore,the test paper based on Si QDs was prepared,which is cost-effective,high sensitivity,good selectivity,easy to use and show excellent anti-interference capability.This method was applied to analyze the content of Co2+in environmental water samples with satisfying results.

关键词： Silicon quantum dots Fluorescence Poly(vinylpyrrolidine) test paper Cobalt detection

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test paper

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大学英语 1987年第4期 71-71页

作者：吴淑清

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Portable device for on-site detection of ammonia nitrogen

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Information Processing in Agriculture 2022年第4期9卷 475-484页

作者： Xianbao Xu Zhuangzhuang Bai Tan Wang National Innovation Center for Digital Fishery China Agricultural UniversityBeijing 100083China Key Laboratory of Smart Farming Technologies for Aquatic Animals and Livestock Ministry of Agriculture and Rural AffairsBeijing 100083China Beijing Engineering and Technology Research Center for Internet of Things in Agriculture China Agricultural UniversityBeijing 100083China College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China College of Mechanical and Electronic Engineering Shandong Agricultural UniversityTaian 271018China

Portable measurement of ammonia nitrogen in water is of great significance for water qual-ity monitoring.It’s beneficial to reduce biological diseases and promote aquatic product safety.Traditional methods such as Nessler’s reagent method suffer from complex opera-tion,time delays and toxic residues.To realize simple and pollution-free detection,this paper develops a low-cost portable device for ammonia nitrogen detection.A test paper was proposed to cooperate the device and offer a chromogenic reaction.The portable device reduces the impact of any ambient light,simplifies the operation,and provides human–computer interaction.The result obtained for the detection range of 0.4–10 mg/L(R^(2) are 0.9902 and 0.9893 for the rang of 0.4–4.5 and 4.5–10 mg/L,respectively)with the detection limit of 0.36 mg/L,and the average recovery of aquaculture water is 100.98–137.75%.The results show that the portable device can provide a great potential for on-site detection ammonia nitrogen concentration.

关键词： Ammonia nitrogen measurement Colorimetric detection Portable device test paper Aquaculture

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3DRGO-NiFe2O4/NiO nanoparticles for fast and simple detection of organophosphorus pesticides

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Chinese Chemical Letters 2020年第1期31卷 177-180页

作者： Zhenni Wei Huiqing Li Jing Wu Yalei Dong Hongyi Zhang Hongli Chen Cuiling Ren State Key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China College of Chemistry and Environmental Science Hebei UniversityBaoding 071002China National Institutes for Food and Drug Control Beijing 100050China

The residues of organophosphorus pesticide(OPs)on fruits and vegetables pose a threat to human health,so it is very meaningful to explore simple and fast detect methods for OPs residual.In this work,nickel ferrite/nickel oxide nanoparticles co-loaded three-dimensional reduced graphene oxide(3DRGONiFe2O4/NiO NPs),as a new low cost nanocomposite,was prepared.Based on its high performance mimetic peroxidase activity,a colorimetric method for the detection of OPs has been developed.Dichlorvos was chosen as model compounds to evaluate the detection performance.The detection linear range for dichlorvos is from 50μg/mL to 2.5×10^4μg/mL with a detection limit of 10μg/mL.Furthermore,a test paper can be developed based on the 3 DRGO-NiFe2O4/NiO NPs for visual detection of dichlorvos,and the image information of the paper sensor can be converted into digital signal and quantitative detection by a smartphone.Notably,this method can also be used to detect dichlorvos in real samples,including vegetables and fruits.Thus,the developed naked assay holds great potential in simple,inexpensive and rapid detection of OPs in fruit and vegetable samples.

关键词： 3DRGO-NiFe2O4/NiO nanoparticles Peroxidase-like activity Organophosphorus pesticides(OPs) test paper Smartphone

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