Label-Free Fluorescent Detection of Hg2+ in Aqueous Media Based on N-Doped MoS2 Nanosheets

NANO ◽  
2018 ◽  
Vol 13 (05) ◽  
pp. 1850057 ◽  
Author(s):  
Jing Liu ◽  
Xiao Li ◽  
Xin Gong ◽  
Taiping Qing ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Lake Water ◽  
Water Samples ◽  
Low Cost ◽  
Aqueous Media ◽  
Fluorescent Detection ◽  
Label Free ◽  
Mos2 Nanosheets ◽  
Practical Applications ◽  
Dopant Atoms

The incorporation of dopant atoms alters the structure of MoS2, resulting in unique properties and practical applications. Herein, a facile and low-cost approach for producing N-doped molybdenum disulfide (N-MoS[Formula: see text] was carried out using melamine and MoS2 in a laboratory tube furnace at 400[Formula: see text]C for 2[Formula: see text]h. The N-MoS2 fluorescent probe showed sensitive response to Hg[Formula: see text] in a wide concentration range of 0.4–10[Formula: see text][Formula: see text]M with a low limit of 28[Formula: see text]nM. The practical applicability of detecting Hg[Formula: see text] in lake water samples may open a new way to evaluate Hg[Formula: see text] in wastewater.

Double stranded DNA-templated copper nanoclusters as a novel fluorescent probe for label-free detection of rutin

2019 ◽  
Vol 11 (28) ◽  
pp. 3584-3589 ◽  
Author(s):  
Yanqiong Lai ◽  
Xia Teng ◽  
Yanli Zhang ◽  
Hongbin Wang ◽  
Pengfei Pang ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Low Cost ◽  
Label Free ◽  
Copper Nanoclusters ◽  
Double Stranded Dna ◽  
Label Free Detection

In this study, we developed a simple, sensitive, low-cost and label-free method to detect rutin by using double-stranded DNA-templated copper nanoclusters (dsDNA-CuNCs) as a fluorescent probe.

Selective and sensitive detection of picric acid based on a water-soluble fluorescent probe

RSC Advances ◽  
2016 ◽  
Vol 6 (44) ◽  
pp. 38328-38331 ◽  
Author(s):  
Haiqin Liang ◽  
Zhiyi Yao ◽  
Wenqi Ge ◽  
Yadong Qiao ◽  
Li Zhang ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Picric Acid ◽  
Aqueous Media ◽  
Water Soluble ◽  
Sensitive Detection ◽  
Fluorescent Detection ◽  
Test Strips

A pyrene-based probe has been applied for the fluorescent detection of picric acid in aqueous media and on test strips.

Hierarchically porous BiOCl@NiCo2O4 nanoplates as low-cost and highly efficient catalysts for the discoloration of organic contaminants in aqueous media

2020 ◽  
Vol 44 (1) ◽  
pp. 258-264 ◽  
Author(s):  
Lihua Zhi ◽  
Youyuan Xu ◽  
Shengya Zhang ◽  
Dongcheng Hu ◽  
Jiacheng Liu
Keyword(s):  
Catalytic Activity ◽  
Water Samples ◽  
Organic Contaminants ◽  
Low Cost ◽  
Aqueous Media ◽  
Contaminated Water ◽  
Hierarchically Porous ◽  
Highly Efficient

BiOCl@NiCo2O4 exhibits remarkable catalytic activity and stability and can be used to deal with real contaminated water samples.

Oligonucleotide-based fluorescence system for sensitive and selective detection of Ag(I) ions in aqueous solution

2012 ◽  
Vol 65 (3) ◽  
pp. 440-446 ◽  
Author(s):  
Hui Chen ◽  
Dan Wang ◽  
Qizhi He ◽  
Hua Li ◽  
Xinghua Ding ◽  
...  
Keyword(s):  
Low Cost ◽  
Aqueous Media ◽  
High Sensitivity ◽  
Silver Ions ◽  
Label Free ◽  
Background Signal ◽  
Folded Structure ◽  
Sensitivity And Selectivity ◽  
Homogeneous Assay ◽  
Walled Carbon Nanotubes

In this letter, a new homogeneous assay with high sensitivity and selectivity was developed for the detection of silver ions in aqueous media at room temperature by using EvaGreen (EG), polycytosine oligonucleotide C20 and single-walled carbon nanotubes (SWNTs). The fluorescence of EG is weak in the absence or presence of randomly coiled C20. After C20 interacted specifically with Ag+ ions through C–Ag+–C bonding, C20 would form a folded structure that preferentially binds to EG. As a result, the fluorescence of the mixture of C20 and EG increased in the presence of Ag+. As having a higher affinity with ssDNA and organic dye, SWNTs could easily form a complex with EG and C20, which led to fluorescence quenching of the dye. Additionally, they can also effectively reduce background-signal fluorescence of the dye and greatly improve its specificity. Under the optimum conditions, the EG/C20 probe exhibited a high selectivity towards Ag+ over other metal ions. The detection limit was up to 7.4 nM (0.8 ppb). This method is low cost, label-free, and easy to use.

Nitrogen and sulfur codoped graphene quantum dots as a new fluorescent probe for Au3+ ions in aqueous media

RSC Advances ◽  
2015 ◽  
Vol 5 (130) ◽  
pp. 107340-107347 ◽  
Author(s):  
Tingting Yang ◽  
Fei Cai ◽  
Xiaodan Zhang ◽  
Yuming Huang
Keyword(s):  
Quantum Dots ◽  
Metal Ions ◽  
Fluorescent Probe ◽  
Aqueous Media ◽  
Graphene Quantum Dots ◽  
Selective Detection ◽  
Label Free

The N and S codoped GQDs can be used as a promising label free fluorescent probe for the sensitive and selective detection of Au3+ in aqueous media, which provides a new application of the functionalized GQDs to the detection of metal ions.

Low-cost synthesis of carbon nanodots from natural products used as a fluorescent probe for the detection of ferrum(iii) ions in lake water

2014 ◽  
Vol 6 (7) ◽  
pp. 2086 ◽  
Author(s):  
Jingyi Xu ◽  
Ying Zhou ◽  
Shuxian Liu ◽  
Meiting Dong ◽  
Chaobiao Huang
Keyword(s):  
Natural Products ◽  
Fluorescent Probe ◽  
Lake Water ◽  
Low Cost ◽  
Carbon Nanodots

scholarly journals Chemical Modification of Combusted Coal Gangue for U(VI) Adsorption: Towards a Waste Control by Waste Strategy

2021 ◽  
Vol 13 (15) ◽  
pp. 8421
Author(s):  
Yuan Gao ◽  
Jiandong Huang ◽  
Meng Li ◽  
Zhongran Dai ◽  
Rongli Jiang ◽  
...  
Keyword(s):  
Structural Analysis ◽  
High Efficiency ◽  
Low Cost ◽  
Chemical Activation ◽  
Cost Effective ◽  
Coal Gangue ◽  
Order Kinetic ◽  
Practical Applications ◽  
Detailed Structural Analysis ◽  
Alkaline Conditions

Uranium mining waste causes serious radiation-related health and environmental problems. This has encouraged efforts toward U(VI) removal with low cost and high efficiency. Typical uranium adsorbents, such as polymers, geopolymers, zeolites, and MOFs, and their associated high costs limit their practical applications. In this regard, this work found that the natural combusted coal gangue (CCG) could be a potential precursor of cheap sorbents to eliminate U(VI). The removal efficiency was modulated by chemical activation under acid and alkaline conditions, obtaining HCG (CCG activated with HCl) and KCG (CCG activated with KOH), respectively. The detailed structural analysis uncovered that those natural mineral substances, including quartz and kaolinite, were the main components in CCG and HCG. One of the key findings was that kalsilite formed in KCG under a mild synthetic condition can conspicuous enhance the affinity towards U(VI). The best equilibrium adsorption capacity with KCG was observed to be 140 mg/g under pH 6 within 120 min, following a pseudo-second-order kinetic model. To understand the improved adsorption performance, an adsorption mechanism was proposed by evaluating the pH of uranyl solutions, adsorbent dosage, as well as contact time. Combining with the structural analysis, this revealed that the uranyl adsorption process was mainly governed by chemisorption. This study gave rise to a utilization approach for CCG to obtain cost-effective adsorbents and paved a novel way towards eliminating uranium by a waste control by waste strategy.

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