JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2024
·Vol. 150
·期 11
·04024050
·
IF 1.6
Huanglong Zhuang,Guiyang Yan,Jiwei Wang,Zhuang Hu,Siqi Yan,Yinkai Sun,Tuanyu Guo,Jianshe Hu,Aikebaier Reheman
This study presents a groundbreaking composite adsorbent, STB@MOF-808-SH, developed through the innovative amalgamation of thiol-functionalized metal-organic framework material (MOF-808-SH) with sulfur-doped C3N4 tubular bundles (STB), targeting the effective elimination of toxic mercury [Hg(II)] ions from polluted water. Our investigation explores crucial determinants of the adsorption process, including pH, initial Hg(II) concentration, and the impact of coexisting ions, while revealing the significant enhancement in mercury ion removal efficiency and adsorption capacity due to the synergistic interaction between STB and MOF-808-SH. Remarkably, under optimal conditions at pH 4.0, STB@MOF-808-SH achieves a removal rate of 91.35% and an impressive adsorption capacity of 228.38 mg/g. These outcomes suggest that the development of the STB@MOF-808-SH composite adsorbent introduces a novel and efficacious approach to tackling water pollution issues, highlighting its potential as a cost-effective and efficient solution for the remediation of toxic Hg(II) ions in wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Yu Sun,Ying Wu,Yong Fu,Chengyue Yang,Jinwen Jiang,Guiyang Yan,Jianshe Hu
In this study, a new tannic acid cross-linking cellulose/polyethyleneimine functionalized magnetic composite (MCP) as a biomass adsorbent of Hg(II) ions was prepared. The morphology and structure of MCP were characterized with FT-IR, TG, XRD, SEM and TEM . The effect of the different factors such as pH, contact time, initial Hg(II) ion concentration, and adsorption temperature on the adsorption behavior was investigated. The results showed that MCP exhibited an excellent selectivity and reutilization, fast removal rate, and very high adsorption capacity. The corresponding adsorption capacity and removal rate of could reach 99.00% and 247.51 mg/g when the pH value, adsorption time, Hg(II) ion concentration were 5, 180 min and 100 mg/L at 293 K. The kinetics followed the pseudo-second-order, which indicated that the adsorption behavior of MCP for Hg(II) ion belonged to the chemical adsorption process and external diffusion. The thermodynamic study showed that the adsorption process was a spontaneous and exothermic process. After the fifth adsorption-desorption experiment, it still had better adsorption performance and reutilization. All in all, MCP with highly stable and efficient, as well as excellent reusability will be a candidate for industry-level applications from wastewater with Hg(II) ions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
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
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Wei Qin,Guanyin Qian,Haibin Tao,Junwei Wang,Jiayin Sun,Xiaofeng Cui,Yuanguang Zhang,Xianlong Zhang
This research focused on developing a series of (G1.0, G2.0, G3.0 and G4.0) PAMAM dendrimers modified attapulgite (ATP) sorbents (G1.0-G4.0 PAMAM-ATP) to remove Hg(II) from aqueous solution. The effects of several parameters including solution pH, contacting time, temperature and initial Hg(II) ion concentration were studied. Batch sorption results showed that the adsorption process was rapid and over 90% of Hg(II) was removed within 80 min at optimal pH 5.0. The adsorption capacity of PAMAM-ATP adsorbents followed the order of G2.0 > G1.0 > G3.0 > G4.0 and the maximum adsorption capacities significantly increased from 5 mg/g (raw ATP), 90 mg/g (amine modified ATP, M-ATP), 192.5 mg/g (polyacrylamine modified ATP, PAM-ATP) by previous similar studies to 200.8 mg/g (G2.0-PAMAM-ATP). Kinetics of adsorption was suitable for pseudo-second-order and controlled by chemical adsorption over a whole sorption range. The adsorption capacities increased as temperature rise from 283 to 303 K and the thermodynamics properties implied that the adsorption processes was spontaneous and endothermic. Thus, the adsorption capacities decreased when the temperature was above 303 K. The isotherm adsorption was described by Langmuir model well with monolayer behavior. A specific coordination between Hg(II) and the N, O atoms on the functional groups of PAMAM-ATP surface was determined by XPS analysis . Furthermore, the maximum adsorption capacity of the regenerated G2.0-PAMAM-ATP sorbents could still be higher than 90% after five cycles by acid treatment. The favorable adsorption capacity compared with other adsorbents exhibited that G2.0-PAMAM-ATP was an excellent renewable sorbent for Hg(II) removal.
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zimo Wang,Yaohan Chen,Li Wang,Jifu Zheng,Yong Fan,Suobo Zhang
The development of new adsorbent materials to improve adsorption capacity and selectivity constitutes a significant research direction for removing toxic ions from water. In this study, a series of Zr-based metal–organic framework hierarchical porous nanofibre membranes (MOFs@PIM-W) was designed and successfully synthesised, and their adsorption properties and mechanism for fluoride ions in water were investigated. The formation of Zr–F bonds in Zr-based MOFs is a primary reason for the rapid, effective, and stable removal of fluoride ions from water. Moreover, in contrast to common powder adsorbents and the conventional static adsorption process, the obtained hierarchical porous nanofibre membranes improve the removal rate of fluoride ions, which may be attributed to the formation of hierarchical porous structures. Specifically, by modifying the types of MOFs, the obtained nanofibre membranes can effectively remove Hg(II) ions from water under a wide range of pH environments (pH = 2–10) with a removal rate of up to 99 %. This indicates that the hierarchical porous design of nanofibre membranes incorporated with their specific adsorption provides a viable option for rapidly and efficiently removing toxic ions from water.
研究领域:
环境科学
·
材料科学
·
水处理
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Lei Wang,Yu Wang,Wenxuan Li,Wenjing Zhi,Yuanyuan Liu,Liang Ni,Yun Wang
Going beyond organic solvent as the solubilizer for small-molecular organic probes motivates exploration of water-soluble polymeric sensors. In this respect, dye-derived thermal-responsive polymeric sensors are an attractive direction, but for its practical application, it is limited by sensor recycling because only irreversible change in the structure of the recognition unit for many sensors can trigger the appearance of the detection signal. Here, we established the oligonucleotide-derived thermal-responsive polymeric sensor, TBC-P1, which overcame this fundamental limitation. The TBC-P1 sensor was based on reversible binding between oligonucleotides and Hg2+ ions, and easy sensor separation via tuning temperature, achieving the Hg2+ detection in a cost-effective and green manner. The TBC-P1 sensor displayed specific and rapid sensing properties toward Hg2+ ions in pure aqueous media via turn-off fluorescence emission, with a limit of detection as low as 0.65 nM (much lower than the presently reported dye-derived polymeric sensors). This high detection sensitivity was further enhanced (with LOD = 0.17 nM) via warming to yield spherical micelles, in which the oligonucleotide-containing thermoresponsive PNIPAM block forming a hydrophobic core amplified the fluorescence signals. Treating the Hg2+-trapped micelles with cysteine (Cys) led to competition-induced release of these combined Hg2+ ions and then thermally precipitating and recycling polymeric sensor TBC-P1. This oligonucleotide-derived thermalresponsive polymeric sensor will open a universal avenue for sensor recycling, which will achieve the goal of reducing cost and improving detection sensitivity of sensors.
研究领域:
材料科学
·
分析化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）