ENERGY & FUELS
·
2018
·
IF 3.024
Yang Peng,Xiangjiang Liu,Xun Gong,Xiaomin Li,Yifu Liu,Erwei Leng,Yang Zhang
In this study, three kinds of monocarboxylic acids, formic, acetic, and propionic acids, are first applied to modified microalgae residuals (M1-RD, M2-RD, and M3-RD, respectively) after lipid extraction, aiming to enhance the adsorption capacity and selective binding ability for Hg(II) ions in simulated wastewater. The effect of pH, temperature, and initial Hg(II) concentration was investigated to identify the optimum adsorption conditions. Batch adsorption tests showed that the maximum adsorption efficiency obtained was 96.7% for M1-RD, 91.1% for M2-RD, and 84.4% for M3-RD at pH 4.05 compared to 48.5 and 57.6% for raw and residual microalgae at pH 5.01, respectively. The adsorption capacity of raw, residual, and modified microalgae increased with the increase of the temperature. Langmuir and Freundlich isotherm model tests showed that the maximum equilibrium adsorption capacity among three modified adsorbents reached 63 ± 3 mg/g for M1-RD, in contrast to 17 ± 1 and 25 ± 2 mg/g for raw and residual microalgae, respectively. The characterization of the modified sample by Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller, and scanning electron microscopy showed that the fibrous structure of the algae was decomposed by carboxyl groups in organic acids involved in microalgae, resulting in a larger surface area and more binding sites. In consideration of ion interference in the actual process, a kind of actual desulfurization wastewater from a 1000 MW coal-fired power plant (Guangdong, China) was introduced in the simulated adsorption system. Verification tests in desulfurization wastewater showed that up to 96% of Hg(II) ions were removed, probably as a result of co-precipitation of mercury and other co-existing ions.
研究领域:
环境科学
·
化学工程
·
废水处理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2024
·
IF 5.8
Mengxia Wang,Meng Zhang,Qi Han,Yufei Shu,Xun Liu,Beizhao Chen,Yuchao Chen,Bei Liu,Zhongying Wang
Mercury (Hg) contamination in groundwater poses significant environmental and health risks, necessitating effective remediation strategies. Recently, molybdenum disulfide (MoS2) nanosheets have emerged as a promising nanomaterial for the remediation of Hg-associated contaminated groundwater. However, the complex interactions between ubiquitous natural organic matter (NOM) and MoS2 may play a significant role in controlling the removal of Hg from groundwater. In this study, we investigated the mechanisms underlying the role of NOM in Hg(II) removal by MoS2. Our findings demonstrated that NOM inhibited the Hg(II) removal by MoS2 from groundwater at a high molar ratio of Hg/MoS2. However, at a low molar ratio of Hg/MoS2, NOM hardly affected the removal performance of MoS2 on Hg(II) because NOM was unable to compete with sufficient MoS2 to complex with Hg(II). The inhibitory effect of NOM on Hg(II) removal was found to be determined by both the molecular weight (MW) and functional groups of NOM: the NOM fraction with higher MW exhibited a higher degree of inhibition, and the –SH groups displayed preferential binding of Hg(II) rather than the –COOH group. It was concluded that the reduction of MoS2 to Hg(II) gradually decreased with increasing addition of NOM, attributed to NOM complexation with Hg(II). Overall, this study provides insights into the significance of NOM characteristics in controlling the removal of Hg(II) from groundwater.
研究领域:
环境科学
·
纳米技术
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 3
·1-8
·
IF 5.705
He Liuying,Lu Yuexiang,Wang Feiyang,Gao Xinxin,Chen Ying,Liu Yueying
The authors describe a colorimetric method for the determination of Hg 2+ ions based on the inhibition of the activity of the enzyme urease. The pH value of solution increases when urease hydrolyzes urea, which can be visualized by adding a pH indicator such as Phenol Red (PhR). Mercaptoethanol as a typical thiol is added to the system to improve selectivity because it binds metal ions and then - unlike the Hg 2+ mercaptoethanol complex - does not inhibit urease. Hence, the color of the pH indicator PhR turns from yellow to pink as the solution becomes alkaline. The Hg 2+ mercaptoethanol complex, in contrast, strongly inhibits urease and the color of the solution remains yellow. The findings were used to design a photometric assay based on the measurement of the ratio of absorptions of PhR at 558 nm and 430 nm. It has a linear response over the 25 to 40 nM Hg 2+ concentration range and a 5 nM detection limit. This is well below the guideline values of Hg 2+ specified by the US Environmental Protection Agency and the World Health Organization for drinking water (10 nM and 30 nM, respectively). The method was employed to the determination of Hg 2+ in water samples spiked with 10 nM levels of Hg 2+ where color changes still can be observed visually.
Schematic presentation of a colorimetric method for the ultrasensitive detection of Hg 2+ based on the inhibition of urease activity. Mercaptoethanol is used to improve the selectivity. Even at Hg 2+ concentrations as low as 5 nM, the color change still can be easily observed by bare eyes.
研究领域:
分析化学
·
环境科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2015
·
IF 1.171
Xiaosheng Tang,Jun Yao,Ping Tang
In this study, 3-mercaptopropyltriethoxysilane (MPTS) modified mesoporous silica based on multiwalled carbon nanotubes (MWCNTs@mSiO2-MPTS) was successfully prepared. The adsorption material was characterized and used for adsorbing Hg(II) ions from aqueous solution. The equilibrium data conformed better to the Langmuir isotherm with maximum adsorption capacity calculated 349.65 mg/g at 40ºC. The kinetics analysis revealed the adsorption process fitted well with the pseudo-second-order kinetic model. The thermodynamic parameters indicated the adsorption process was spontaneous and endothermic. All results obtained suggested that MWCNTs@mSiO2-MPTS may be employed as an efficient material for the adsorption or preconcentration of Hg(II) ions from aqueous solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Donglei Wei,Xiaoxia Liu,Zichen Wu,Hou Chen,Liangjiu Bai,Huawei Yang,Lixia Yang,Wenxiang Wang,Xiaofeng Zhang,Junling Wang
Cellulose-based polymer brush-on-brush composite adsorbent is prepared under simple and mild conditions via a four-step two sequential organophotocatalyzed atom transfer radical polymerization for the efficient removal of Hg(II) from aqueous media. The defined structure of the cellulose-based composites was supported by the characterization results. Influences of solution pH, temperature and adsorbent dosage on the adsorption behavior of the adsorbent were determined by batch experiments. The adsorption performance of the polymer brush composite intermediate was also investigated as a comparison to the final adsorbent to illustrate the significance of the topological surface structure on adsorption efficiency and capacity. Adsorption kinetics, isotherm and mechanism were studied systematically to further clarify the adsorption process. In addition, the adsorbent exhibits good applicability as it can be reused for 5 times without obvious decrease in desorption rate (>90 %), which showed potential utility for preconcentration and recovery of aqueous Hg(II).
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Zhu Yu,Zaiwen Tian,Zhengqian Li,Zaoli Luo,Yan Li,Yi Li,Jun Ren
In this paper, a thioacetal chemosensor 1 incorporating simultaneously a carbazole moiety and an azobenzene moiety was synthesized. Among other metal ions , Hg 2+ proved to be able to selectively induce both color and fluorescence changes of 1 . The mechanism of Hg 2+ -promoted cleavage of thioacetal was confirmed by 1 H NMR experiments. Upon the addition of Hg 2+ into the yellow CH 3 CN/H 2 O solution of 1 , the resultant azobenzene-containing thioglycolamide was precipitated from the solution as a mercuric salt, leading to a colorless solution. Therefore, a novel color change pattern was developed.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Liheng Feng,Yang Deng,Xiaoju Wang,Mingguang Liu
A facile polymer consisted of quinoline, thiophene and benzothiazole groups was designed and synthesized by Suzuki coupling reaction. The study of photophysical property indicated that the polymer was a red light emitter with maximum absorption (490 nm) and emission (610 nm) peaks. The assays of thermal gravimetric analysis (TGA) and cyclic voltammetry (CV) revealed that the polymer possesses good thermal (Td, 228 °C) and electrochemical properties. The experimental data based on the cyclic voltammetry were in good agreement with the results of theoretical calculations. The sensing processes of the polymer to metal ions were investigated by UV–vis absorption and fluorescence emission spectra. The results showed that the polymer had high selectivity and sensitivity for Hg(II) ions with an obvious “turn-on” fluorescence in the presence of Hg(II). Noticeably, the polymer as a fluorescence probe can be applied in the detection in practical samples. The attribution of the work lies in providing a new strategy for design and application of polymer probes in analysis and testing fields.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 41
·33991-34002
·
IF 4.6
Jiaxu Tian,Chenfeng Wang,Yueyue Wang,Xiaoyi Zhang,Jinxuan Pang,Chang Li,Shiying Tang
Mercury ions (Hg2+) are highly toxic and bioaccumulative, posing a serious threat to the environment and human health. Traditional analytical techniques are limited by cost, portability and real-time monitoring capabilities, and there is an urgent need for sensitive and portable detection methods. In this study, copper nanoclusters (CuNCs) were encapsulated in red-emitting europium metal–organic frameworks (Eu-MOFs), and a ratiometric fluorescence probe based on CuNCs@EuMOFs was constructed and used for the detection of Hg2+ in water extracts of traditional Chinese medicine samples and river samples. In the presence of Hg2+, the fluorescence of this probe is enhanced at 450 nm and weakened at 618 nm. Visual quantification can be performed using a smart phone based on the color change. The linear range is 0–360 μM (R2 = 0.9986), and the detection limit is 0.94 nM. The sample recovery rate was 94.43–106.43% (RSD < 4.37%). This study provides a new strategy for the portable visual detection of Hg2+ in complex matrices.
研究领域:
环境监测
·
分析化学
·
纳米材料
·
荧光传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Ye Jia,Donghai Zhu,Qifan Yang,Xu Liu,Zahra Gholami,Mohammadtaghi Vakili,Shuangxi Zhou,Wei Wang
The presence of mercury (Hg(II)), a highly toxic pollutant in the aquatic environment, motivates researchers to use an effective method to remove it from water. Herein, we synthesized COF-TAZ and COF-TOE via post-modification with 3-mercapto-1,2,4-triazole and 4-(methylsulfanyl)thiophenol to form triazole group and methylthio group, respectively, and followed by characterization with SEM, FTIR, and XRD, etc. The adsorption behaviors of Hg(II) on two modified COFs were evaluated by adsorption kinetic models using the pseudo-first order, pseudo-second order and intra-particle diffusion models, as well as isotherm models, i.e., Langmuir and Freundlich models. COF-TAZ and COF-TOE manifested maximum experimental uptake capacity of 108.09 mg g −1 and 104.85 mg g −1 , respectively. Notably, COF-TAZ exhibited commendable binding selectivity towards Hg(II) and displayed a good recycling ability, with a removal percentage still above 90% after five cycles. Especially, the adsorption mechanisms of COF-TAZ and COF-TOE were clarified by FTIR, XPS and DFT calculations, suggesting that electrostatic interaction and chelation were involved in the adsorption process . This study shows that functionalized COFs have good application prospects in effective removal of heavy metals in water.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Xiluan Yan,Shiyun Cheng,Yipi Xiao,Shuangbin Wu,Hongyi Mu,Zhiying Shi,Liang Guo,Fanrong Ai,Xiangjuan Zheng
Metal-organic gels (MOGs) are a type of metal-organic colloid material with a large specific surface area, loose porous structure, and open metal active sites. In this work, FeNi-MOGs were synthesized by the simple one-step static method, using Fe(III) and Ni(II) as the central metal ions and terephthalic acid as the organic ligand. The prepared FeNi-MOGs could effectively catalyze the chemiluminescence of luminol without the involvement of H 2 O 2 , which exhibited good catalytic activity. Then, the multifunctional detected platform was constructed for the detection of GSH and Hg 2+ , based on the antioxidant capacity of GSH, and the strong affinity between mercury ion (Hg 2+ ) and GSH which inactivated the antioxidant capacity of GSH. The experimental limits of detection (LOD) for GSH and Hg 2+ were 76 nM and 210 nM, and the detection ranges were 2–100 μM and 8–4000 μM, respectively. The as-proposed sensor had good performance in both detection limit and detection range of GSH and Hg 2+ , which fully met the needs of daily life. Surprisingly, the sensor had low detection limits and an extremely wide detection range for Hg 2+ , spanning five orders of magnitude. Furthermore, the detection of mercury ions in actual lake water and GSH in human serum showed good results, with recovery rates ranging from 90.10 % to 105.37 %, which proved that the method was accurate and reliable. The as-proposed sensor had great potential as the platform for GSH and Hg 2+ detection applications.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 89
·86428-86435
·
IF 3.289
Chunlai Wu,Guifen Zhu,Jing Fan,Jianji Wang
In this work, for the first time, neutral red functionalized Fe3O4@SiO2 was prepared, characterized and subsequently used for magnetic solid phase extraction of Hg(II) from environmental water samples followed by inductively coupled plasma-mass spectrometry determination. TEM images shows uniform decoration of SiO2 on the Fe3O4 surface (with a typical particle size of 220 nm). The FT-IR analysis indicates that neutral red was combined with the SiO2 surface by chemical bonds. Trace levels of Hg(II) can be extracted efficiently and selectively due to the electrostatic and coordinate interactions of Hg(II) and neutral red. Parameters affecting the quantitative recovery of Hg(II) were investigated, and the optimized values were 6.0, 25 mg, 60 min, and 5 mL of 1.0 mol L−1 HNO3 for pH value of the solution, amount of the extractant, equilibration time and volume, concentration of eluent, respectively. Under the optimized conditions, at Hg(II) concentrations as low as 2 ng mL−1, the recovery is >85%, and the enrichment factor is as high as 100. The commonly encountered ions show no interference with the extraction process. The material can be regenerated and reused at least ten times without loss of adsorption capacity (84 mg g−1). In addition, magnetic separation greatly simplifies the extraction procedure and filtration and/or centrifugation processes were avoided. The material was successfully applied for the separation and pre-concentration of low levels of Hg(II) in environmental water samples with satisfactory results.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）