SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Hanlun Yang,Canwei Peng,Jiajia Han,Yonghai Song,Li Wang
Mercury ion (Hg(II)) has serious destructive effects on organisms and environments even at extremely low concentration. Therefore, effective removal and highly sensitive determination of trace Hg(II) is very important. Herein, mercaptan functionalized metal-organic frameworks (MOFs) were prepared by the coordination between Zr (IV) and 2,5-dimercaptoterephthalic acid (Zr-DMBD MOFs) and attached to three-dimensional kenaf stem-derived carbon (3D-KSC) to form a novel nanocomposite for removal and electrochemical detection of Hg(II). The sensitivity of Hg(II) detection was 324.58 μA μM −1 cm -2 , the linear range was 0.25 μM–3.5 μM and the detection limit was 0.05 μM. The good performances were because lots of Zr-DMBD MOFs were uniformly dispersed on 3D-KSC and the porous Zr-DMBD MOFs had a large number of mercaptan groups to enrich Hg(II) significantly on the electrode. The Hg(II) detection would not be interfered by other co-existing heavy metal ions, and the Zr-DMBD MOFs/3D-KSC also showed excellent stability and reproducibility. Furthermore, the Zr-DMBD MOFs/3D-KSC could effectively remove Hg(II) in real wastewater. The residues were lower than national discharge standard of industrial wastewater (GB30770-2014).
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TALANTA
·
2018
·
IF 4.244
Hao Zhang,Chen Nie,Jiahui Wang,Ruifang Guan,Duxia Cao
Organic-inorganic hybrid fluorescent microspheres (OI-FMs) without typical fluorophores were prepared. Fluorescence quantum yield of OI-FMs is up to 70.0% after being heated in an oven at 120 °C (named as OI-FMs-120). Interestingly, OI-FMs-120 shows different detection performances in different solvents. It can be used for qualitative and quantitative detection of Fe 3 + with a detection limit of 37.8 nM in absolute ethanol. While in aqueous solution, it can be applied as an ON-OFF-ON fluorescent probe . Fluorescence of the probe is quenched by Hg 2 + and later recovered by biothiols. The detection limit is as low as 34.9 nM for Hg 2 + , 91.0 nM for Cys, 0.12 μM for Hcy and 0.13 μM for GSH in aqueous medium, respectively.
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ANALYTICA CHIMICA ACTA
·
2014
·
IF 4.517
Juan Hou,Fengshuang Zhang,Xu Yan,Long Wang,Jin Yan,Hong Ding,Lan Ding
In this paper, we presented a novel, rapid and highly sensitive sensor for glutathione (GSH), cysteine (Cys) and histidine (His) based on the recovered fluorescence of the carbon quantum dots (CQDs)–Hg(II) system. The CQDs were synthesized by microwave-assisted approach in one pot according to our previous report. The fluorescence of CQDs could be quenched in the presence of Hg(II) due to the coordination occurring between Hg(II) and functional groups on the surface of CQDs. Subsequently, the fluorescence of the CQDs–Hg(II) system was recovered gradually with the addition of GSH, Cys or His due to their stronger affinity with Hg(II). A good linear relationship was obtained from 0.10 to 20 μmol L −1 for GSH, from 0.20 to 45 μmol L −1 for Cys and from 0.50 to 60 μmol L −1 for His, respectively. This method has been successfully applied to the trace detection of GSH, Cys or His in human serum samples with satisfactory results. The proposed method was simple in design and fast in operation, which demonstrated great potential in bio-sensing fields.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Boyun Wang,Wanqi Zhang,Yuan Zhong,Yuan Guo,Ximing Wang,Xiaotao Zhang
Ions of mercury, one of the most hazardous heavy metals in nature, pose serious risks to the environment and human health. Blue sulfur-doped carbon dots (SCDs) from corn stalks were utilized as material. The SCDs were incorporated into a carboxylated hydrogel modified with sulfur, and a compound gel (SCDs–KTOCS gel) was successfully fabricated for simultaneous fluorescence detection and Hg(II) adsorption. This enabled the effective identification and removal of Hg(II) from contaminated water. The chemical content, fluorescence properties, and adsorption behaviors of the SCDs–KTOCS–gels were analyzed. The results demonstrate that the SCDs–KTOCS–gels exhibited effective Hg(II) adsorption (193 mg/g) and an extensive linear spectrum for Hg(II) fluorescence emission (150–500 mg/L; detection limit = 1.5668 mg/L). The adsorption values fit well with the Temkin models and pseudo-second-order kinetics. Additionally, Hg(II) detection and adsorption in the SCDs–KTOCS–gels were examined. By exchanging the existing probe for a suitable one that fits various relevant applications, this study suggests an environmentally friendly and sustainable method of producing materials for removing and detecting Hg(II) and constructing a fluorescence hydrogel for the detection and adsorption of different metals.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiao He,Yuxiang Huang,Jinlei Xu,Fang Zeng,Xinjian Cheng
Dendritic fibrous nano-silica (DFNS) possesses unique porous structure, making it an outstanding candidate for heavy metal adsorption and separation. It is interesting to introduce natural polymer (chitosan) into DFNS and produce natural materials-based porous DFNS. Initially, in this work, DFNS underwent modification to enlarge size and enrich with -C≡C bonds. And then, NH2-naphthalimide fluorophore was click-reacted with the modified DFNS, forming fluorescent DFNS (FL-DFNS). Eventually, chitosan was integrated into FL-DFNS using diacyl chloride, generating the organic–inorganic fluorescent composite micro-beads (FL-DFNS@CS-3). FL-DFNS acts as a “turn on” sensor for Hg 2+ /Hg + ions, showing up to 5 times fluorescence increase. Also, it exhibited effective mercury adsorption. Due to its porous structure, it demonstrated good performance in adsorbing and separating Hg 2+ /Hg + ions, achieving removal ratios of 98.8 % and 96.1 %, and adsorption capacities of 196.2 mg/g and 180.4 mg/g, respectively. It reached effective adsorption equilibrium within 15 min and was reusable up to seven times. Overall, this work confirms the practical applicability of FL-DFNS and FL-DFNS@CS micro-beads for identifying and removing Hg 2+ /Hg + ions. Further exploration is worthy to explore its potential in environmental science and engineering.
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NANOTECHNOLOGY
·
2018
·Vol. 29
·期 16
·165502
·
IF 3.404
Yinxiu Zuo,Jingkun Xu,Huakun Xing,Xuemin Duan,Limin Lu,Guo Ye,Haiyan Jia,Yongfang Yu
In this paper, piperazine-grafted reduced graphene oxide (NH-rGO) was synthesized via a simple and green two-step procedure: (i) opening of the resulting epoxides of graphene oxide (GO) with piperazine (NH) through nucleophilic substitution; (ii) reduction of GO with ascorbic acid. Its structure and morphology were characterized by scanning electron microscopy and x-ray photoelectron spectroscopy. The NH-rGO modified glassy carbon electrode was explored as an electrochemical sensor for the determination of Hg(II) using a differential pulse anodic stripping voltammetry technique. Hg(II) can be efficiently accumulated and deposited on the surface of a modified electrode by strong coordination chemical bonds formed between Hg(II) and NH. And then the anodic stripping current can be significantly enhanced by rGO with the merits of large specific surface area and high conductivity, which served as a signal amplifier, finally realizing the highly sensitive determination of Hg(II). The experimental parameters including the pH value of the acetate buffer, deposition potential and deposition time were optimized. Under optimal conditions, the developed sensor exhibited a wide linear range from 0.4–12 000 nM with a low limit of detection of 0.2 nM, which is well below the guideline value in drinking water set by the WHO. Moreover, the practical application of this method was confirmed by an assay of Hg(II) in tap water samples with acceptable results.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ting Yang,Kwok-Hung Chung,Wenjie Hu,Fuhua Yang,Hua Yang,Anqi Zhou,Anqi Tao,Zhi Liu
Ultraviolet C (UVC) mercury-vapor lamps have effectively achieved the decontamination of hydrocarbons and antimicrobial effects on dental implants. This study aimed to compare the effectiveness of photofunctionalization technologies on titanium surface by using two different UVC light sources, mercury-vapor (Hg-vapor, λ = 254 nm) and light-emitting diode (LED, λ = 275 nm) radiators. By exposing aged titanium surface to two UVC light sources, the effect on osseointegration and bacteria and the relevant mechanism was investigated. Results indicated that irradiation with UVC light source on aged titanium surface decreased carbon atom concentration, changed surface from hydrophobic to hydrophilic, consumed oxygen, formed reactive oxygen species, and altered surface potential. Additionally, irradiated groups had increased protein adsorption, changed protein structure, promoted in vitro biomineralization, and significantly enhanced the functions of human bone marrow mesenchymal stem cells. Irradiated groups also had significantly higher bone volume/tissue volume and bone-implant contact after 4-week healing by placing titanium implant in rat maxilla. UV-irradiated titanium surfaces manifested inhibiting facultative anaerobes such as Staphylococcus aureus and Escherichia coli but promoting anaerobes such as Porphyromonas gingivalis . The changes of the physicochemical properties and bioactivities of titanium surface were in a radiation energy-dependent manner. UVC-LED radiator showed similar photofunctionalization abilities as Hg-vapor radiator at similar radiation energies. Therefore, combining with its no mercury, compact design, faster start-up time, and stable output, UVC-LED radiator has the potential to be an alternative source of Hg-vapor for UV-photofunctionalization procedure.
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DYES AND PIGMENTS
·
2024
·
IF 4.1
Jie Wen,Jin Tong,Ya-Lan Kou,Ji Wang,Shu-Yan Yu
Five tetraphenylethene (TPE) derivatives 1a , 1b , 2 , 3 , and 4 with adjustable stimuli-responsive characteristics were designed and synthesized in this study. Using single-crystal X-ray diffraction, the effects of substitution positions and pyrazolyl numbers on molecular packing were examined in the solid state. The findings indicate that as the pyrazolyl numbers increased, the molecular packing of the compound progressively changed from the C−H···π stacked compact mode in 1 − 3 to the X-crossing stacked loose mode in 4 , which results in the origin of various stimuli-responsive phenomena in compound 4 . This approach facilitates the preparation of multi-stimuli-responsive (thermochromism, mechanochromism, and metal ion fluorescence switch) smart fluorophores with tunable emission color. Moreover, compound 4, with an excellent fluorescence performance, exhibited three different colors when reversible mechanochromism was selected as the candidate for an optical recording material and security ink. This study proposes an effective method to guide the design of stimuli-responsive materials, which, in turn, would facilitate the development of high-contrast MC molecules, and the optical information anticounterfeiting based on grinding was proven by utilizing the grind-responsive luminescence capabilities.
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MOLECULES
·
2025
·Vol. 30
·期 23
·4635
·
IF 4.6
Shucai Gao,Libin Wan,Fayun Wang,Haidong Gao,Fanghui Zhao,Na Li,Jingjing Yao,Yeru Liu,Hongwei Liu
Exposure to Hg2+-contaminated water poses severe risks to human health. Porous organic polymers (POPs) are known for removing heavy metals efficiently. However, the rapid and simple preparation of POP with efficient and selective adsorption capacities remains challenging. Herein, an effective strategy for the room-temperature preparation of TpPa-1 via a 1-step Schiff-base reaction of 2,4,6-triformylphloroglucinol (Tp) and p-phenylenediamine (Pa-1) using scandium(III) trifluromethanesulfonate as a catalyst is described. Various approaches were used to characterize TpPa-1, including SEM, TEM, XRD, FT-IR, NMR, BET, and TG analysis. TpPa-1 was applied to adsorb trace Hg2+from aqueous solution, and its adsorption performance was assessed through batch adsorption experiments. The results indicated that over 94% of 100 μg L−1Hg2+was removed within 90 min, with the isotherm and kinetics conforming to the Freundlich and the pseudo-second-order models, respectively. Combined with XPS analysis, the Hg2+adsorption of TpPa-1 was primarily dominated by chelation, competitive, and electrostatic interactions between the carbonyl groups of TpPa-1 and Hg2+. Because of its benefits of facile synthesis, enhanced removal performance, good selectivity, and reusability, the prepared POP material has great potential for Hg2+removal from aqueous solutions.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yue Sun,Yuanli Liu,Zimo Lou,Kunlun Yang,Dan Lv,Jiasheng Zhou,Shams Ali Baig,Xinhua Xu
Iron sulfide (FeS) nanoparticles with large specific surface area and abundant pore structure have been recognized as effective Hg(II) adsorbents. However, bare FeS nanoparticles can aggregate easily, which greatly limited their engineering applications. In this study, FeS nanoparticles were stabilized by biomaterials, including sodium carboxymethyl cellulose (CMC), gelatin and starch, and thoroughly investigated for the stabilization effects. Results demonstrated that the three biomaterial stabilized FeS nanoparticles namely CMC-FeS, gelatin-FeS and starch-FeS enhanced the adsorption efficiency significantly. The maximum adsorption capacities of CMC-FeS, gelatin-FeS and starch-FeS (mass ratio of stabilizer to FeS was 1:6) achieved ∼1726 mg/g, ∼1939 mg/g and ∼1989 mg/g respectively, which were over twice of the bare FeS. TEM images suggested that biomaterial-FeS nanoparticles were dispersed more uniformly than bare FeS. The removal processes of the three materials obeyed pseudo-second-order kinetic model ( R 2 ≥ 0.9986), implying that the rate-limiting step was the chemical sorption process. High removal efficiency of biomaterial-FeS nanoparticles was observed in the initial pH range of 6–11. The presence of Cl − could accelerate the reaction process, whereas the presence of humic acid (HA) could inhibit Hg(II) uptake. In addition, high concentration of coexisting cations (30 mM as Cd 2+ , Pb 2+ , Cu 2+ , and Ca 2+ ) had no significant effect on Hg(II) removal.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 6
·1641-1650
·
IF 3.146
Ling Yang,Wu Jiang,Yang Lingtao,Liu Dongjing
The emission of mercury from anthropogenic activities is a serious concern in both developed and developing countries due to its high toxicity and persistence. Here, carbon nitride nanosheets (CNNS) were attained via a two-step thermal etching method and applied for Hg 0 removal. Proper deposition of ZnS can markedly reinforce the Hg 0 capture ability of CNNS. 10ZnS/CNNS notably outperforms ZnS and CNNS at 100 °C, which is primarily attributed to surface chemisorbed oxygen species and polysulfide active sites. Besides, Hg 0 adsorption and thermal catalytic oxidation pathways are further disclosed using quantum chemistry calculations based on density functional theory (DFT). The calculation results show that the presence of zinc species is beneficial to the decomposition of adsorbed oxygen, which plays a key role in the catalytic oxidation of Hg 0 , thereby contributing to the enhancement of mercury removal performance.
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DESALINATION
·
2026
·
IF 9.9
Ming Li,Xiaofei Fan,Jianing Hu,Jinghong Zhang,Huining Xiao,Yuling Zhang
A 3D porous MXene/cellulose aerogel is fabricated by sol-gel and freeze-drying technique. • It achieves a high Hg(II) uptake of 877.19 mg/g at 318 K via chemisorption and redox. • The aerogel also removes methylene blue efficiently by electrostatic attraction. • It shows good reusability, easy separation, and structural stability. Aqueous contamination by heavy metal ions and organic dyes represents two major categories of water pollutants. Developing adsorbents that can efficiently remove both types is highly desirable. Here, multilayered MXene (Ti 3 C 2 T x ) was prepared by selective etching of Ti 3 AlC 2 using LiF/HCl and combined with cellulose to construct a three-dimensional porous MX@Cell composite aerogel via sol-gel and freeze-drying. The materials were characterized by SEM, XRD, FTIR, nitrogen adsorption-desorption, and XPS. Batch adsorption tests for Hg(II) and MB were conducted separately. MX@Cell-25 (25 wt% MXene) achieved a maximum theoretical Hg(II) capacity of 877.19 mg/g at 318 K, outperforming numerous previously reported adsorbents. It followed pseudo-second-order kinetics and the Freundlich isotherm, indicating chemisorption-dominated multilayer adsorption on a heterogeneous surface. Thermodynamic analysis indicated that the adsorption of Hg(II) on MX@Cell-25 was a spontaneous process accompanied by an entropy increase and an endothermic reaction ( ΔH > 0), confirming that higher temperatures favored the adsorption process. XPS revealed a synergistic mechanism of electrostatic attraction, surface coordination, and redox reactions. For MB, the maximum capacity was 104.93 mg/g at 318 K, with pseudo-second-order kinetics and Langmuir isotherm fitting, suggesting monolayer adsorption driven by electrostatic attraction. The composite showed good reusability (about 85% Hg(II) capacity retention after seven cycles), as well as easy separability and environmental friendliness. This work demonstrates that MXene/cellulose composite aerogel is a promising candidate for removing both heavy metal ions and organic dyes from water. Download: Download high-res image (274KB) Download: Download full-size image
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