SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Yang Zhang,Jinchao Shen,Hong Yang,Yan Yang,Zhiguo Zhou,Shiping Yang
A magnetic sensor for Cd 2+ has been developed based on (Zn, Mn)-doped iron oxide nanoparticles [(Zn, Mn)Fe 3 O 4 NPs], which was modified by ethyl 1-(2-(3′,4′-dihydroxyphenyl)-2-oxoethyl)-1H-1,2,3-triazole-4-carboxylate (ETC). ETC provided the binding sites to Cd 2+ to induce the transformation of (Zn, Mn)Fe 3 O 4 NPs from a dispersed to an aggregated state with a corresponding increase in the transverse relaxation time ( T 2 ) of surrounding water protons. Owing to the special strong interaction between ETC and Cd 2+ , ETC coordinated (Zn, Mn)Fe 3 O 4 [(ETC-(Zn, Mn)Fe 3 O 4 )] NPs exhibited a low limit of detection of Cd 2+ of 3.5 nM and a high selectivity over other metal ions . Furthermore, ETC-(Zn, Mn)Fe 3 O 4 NPs can be used to detect Cd 2+ in living cells by magnetic resonance (MR) imaging.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Bo Huang,Meice Lu,Dali Wang,Yiheng Song,Li Zhou
In this paper, we report a facile approach to prepare magnetic gel based on the simultaneous formation of Fe 3 O 4 nanoparticles and crosslinking of natural peach gum polysaccharide . The obtained magnetic gel with porous structure, high specific surface area and numerous oxygen-containing functional groups exhibited fast and efficient adsorption capability towards Pb 2+ and Cd 2+ ions. The adsorption isotherms and kinetics presented good correlation with Langmuir isotherm and pseudo-second-order model, respectively. The maximum adsorption capacity of the magnetic gel for Pb 2+ and Cd 2+ ions can reach 277.0 and 141.4 mg g −1 , respectively, which is much higher than many other reported magnetic adsorbents. In addition, the magnetic gel can serve as a magnetic support for in situ growth of Pt nanocatalyst with high catalytic activity, as demonstrated by the reduction of 4-nitrophenol. Moreover, the magnetic gel exhibited excellent magnetic separation capability and superior reusability both for the adsorption and catalysis applications.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Hewei Song,Amit Kumar,Yuling Zhang
In the recent decades, due to rapid increase in industrialization, urbanization, anthropogenic activity in the catchments, removal of heavy metals contaminants in wastewater has become global challenges. Numerous advance technologies have been introduced to deal with these problems but failed in reducing adequate pollution load in the contaminated water and/or wastewater. In this study, sulfur-ferromagnetic nanoparticles (SFMNs) were synthesized by modification of nano-Fe 3 O 4 , which can be rapidly separated from the environment by an external magnetic field after in situ repair. Its structure and physical properties were characterized by conventional techniques included Transmission electron microscope (TEM), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The ability of the SFMNs to remove Pb 2+ and Cd 2+ was studied at different temperatures and initial metal ions concentrations. The adsorption kinetics showed that the adsorption equilibrium time of Pb 2+ and Cd 2+ was 300 min consequently adsorption process of SFMNs fit well (R 2 > 0.99) with pseudo-second-order model. The adsorption thermodynamics showed that the adsorption of Pb 2+ and Cd 2+ on SFMNs is spontaneous (negative value of ΔG 0 ) endothermic process (positive value of ΔH 0 ) and fit well (R 2 > 0.98) with the Langmuir isothermal model. Density functional theory (DFT) calculations show that SFMNs can transfer electrons to Pb 2+ and Cd 2+ , and the metal ions form stable chelates on the ligand surface. This study implies that newly synthesized sulfur-ferromagnetic nanoparticles could play an instrumental role in metal ions removal from water and wastewater.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 4
·e53361
·
IF 3.057
Qianyong Liang,Ying Pan,Dong Zhang,Ting Lü,Hongting Zhao,Yan Zhang
Calcium cross-linked layered double hydroxide-bichar/alginate aerogel (LBCA) was synthesized by ultrasonic-assisted hydrothermal and freeze-drying method. The Mg-Al layered double hydroxide (LDH) was successfully loaded on the bichar (BC) and the LDH-BC was dispersed uniformly in the calcium alginate aerogel, which was confirmed by X-Ray Diffraction, scanning electron microscopy and BET tests. The obtained LBCA was applied to remove the Cu 2+ and Cd 2+ in the aqueous solution. As compared with LDH nanosheets, removal rates of LBCA aerogel on Cu 2+ and Cd 2+ were ranged from 59% to 94% and 45% to 86%, respectively. The adsorption kinetic data accorded with the pseudo second-order kinetic equation, and the isotherm data were in good agreement with the Langmuir model. Moreover, LBCA aerogel showed good regeneration ability, and raw materials for the fabrication of LBCA aerogel are abundant and low price.
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
ChemistrySelect
·
2023
·Vol. 8
·期 45
·e202302698
·
IF 2.1
Huiyan Wu,Zhaowei Liang,Zihan Zhang,Naijia Jiang,Jianhua Luo,Liyun Yang,Zhiqiang Zhou
Graphical An “on-off-on” nanoprobe for detecting Cd 2+ was developed using CdSe QDs. Based on the formation of CdSe/CdS QDs, Cd 2+ could restore the fluorescence of CdSe QDs quenched by S 2− . The fluorescence increased with increasing concentration of Cd 2+ in the range of 0.2–9 μM with low detection limit of 27 nM. In this work, an “on-off-on” nanoprobe for specific detection of Cd 2+ was constructed using N -acetyl- l -cysteine (NAC)-modified CdSe quantum dots (QDs). The prepared CdSe QDs exhibit characteristic green fluorescence. The adsorbed S 2− on the surface of CdSe QDs leads to dangling bonds and causes the fluorescence quenching of QDs, where the fluorescence of the system turns “off“. When Cd 2+ exists, it can react with the adsorbed S 2− to form CdS shell, resulting in the fluorescence enhancement of CdSe QDs, where the fluorescence of the system turns “on”. Due to the similar lattice structure between CdSe and CdS, CdSe/CdS can be produced by shell deposition, while self-nucleation of metal sulfide is observed in the presence of other metal ions. Thus, the developed nanoprobe shows high selectivity for Cd 2+ . Under the optimum sensing conditions, the fluorescence sensing signal of CdSe QDs depends linearly on the Cd 2+ in the range of 0.2–9 μM. The limit of detection (LOD) and limit of quantification (LOQ) of this nanoprobe is 27 nM and 90 nM, respectively. Furthermore, the proposed nanoprobe can monitor Cd 2+ in drinking water with a recovery rate between 95.82 % and 102.00 %, indicating its good practicability and applicability for real sample analysis.
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DOI
高影响因子
Frontiers in Marine Science
·
2022
·
IF 5.247
Wang Jingjing,Li Xiuying,Yan Jun,Yang Yi
Microbial reductive dechlorination has been considered an effective process for the clean-up of organohalide-contaminated sites. Heavy metal ions are commonly present as co-contaminants in various organohalide-contaminated sites. To understand the impacts of heavy metal ions on the environmental fate of organohalides, we investigated the effects of Zn2+, Cu2+ and Cd2+ on reductive dechlorination of tetrachloroethene (PCE) and 1,2-dichloroethane (1,2-DCA) in sediment microcosms and transferred enrichment cultures. PCE and 1,2-DCA-dechlorinating enrichment cultures could be consecutively transferred in the presence of up to 10 mg/L Cu2+ or 10 mg/L Zn2+; by comparison, up to 50 mg/L Cd2+ had minor impacts on the microbial reductive dechlorination of PCE and 1,2-DCA. The inhibitory effects of tested heavy metal ions on microbial reductive dechlorination ranked in descending order are Zn2+, Cu2+, and Cd2+. Community profiling and principal component analysis indicate that the concentration and type of contaminants (e.g., heavy metal ions, organohalides) shaped the microbial community structure, an observation similar to a prior report. The enrichment of certain organohalide-respring bacteria (e.g., Dehalococcoides, Dehalogenimonas) during continuous transfers exposed to heavy metal ions suggests that they are capable of tolerating high concentrations of heavy metal ions. Our findings provide insights into the impacts of heavy metal ions on microbial reductive dechlorination and may be helpful for in situ bioremediation at sites contaminated with organohalides and heavy metals.
研究领域:
环境科学
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微生物学
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生物修复
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DOI
高影响因子
TALANTA
·
2022
·
IF 6.556
Bin Zhou,Runlin Yang,Muhammad Sohail,Xiaoxue Kong,Xing Zhang,Ninghua Fu,Bingzhi Li
CRISPR is reshaping biosensing technology due to its programmability, sensitivity, and specificity. Most current CRISPR-based biosensors are developed based on Cas12 and Cas13, while the biosensing potentials of the newly discovered Cas14 have not been fully elucidated yet. Herein, a fluorometric biosensor named HARRY ( h ighly sensitive a ptamer- r egulated Cas14 R -loop for bioanal y sis) was developed. The diblock ssDNA is designed to contain the activator sequence of Cas14 and the aptamer sequence of specific targets. In the absence of targets, the ssDNA activates Cas14a, then the Cas14a trans -cleavages the fluorescent reporter, causing fluorescence enhancement. In the presence of the targets, ssDNA-target assembly is formed via aptamer interaction, resulting in the inhibition of Cas14a activation. HARRY can detect ATP , Cd 2+ , histamine, aflatoxin B1 , and thrombin with detection limits at the low-nanomolar level, which shows improvement compared with Cas12a-based aptasensors in sensitivity and versatility. We reasoned that the improvement is derived from the ssDNA specificity of Cas14a and found that the detection limit of HARRY is correlated to the binding affinities of aptamers. This study unlocks the potential of Cas14a in versatile aptasensing, which may inspire the development of CRISPR-based biosensors from the Cas14a branch.
研究领域:
生物技术
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分子生物学
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纳米技术
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.799
Yu Zhang,Yun Jia,Yaoguo Huang,Linlin Chen,Ming Wang,Yali Zhang
In this study, thioacetamide (TAA) was used as the precipitant to selectively precipitate Cu2+, Cd2+, and Pb2+ in acidic solution. The effect of temperature, time, and pH conditions on the selective precipitation of metal ions were investigated. Meanwhile, the thermodynamic process of single metal precipitation was studied by Avrami equation. By continuously and accurately controlling pH, Cu2+, Cd2+, and Pb2+ were successfully precipitated at pH 2.5, 4.0, and 6.5, respectively. Traditional inorganic sulfide precipitator Na2S was also used to compare with TAA under the same conditions, and the results showed that compared with Na2S, TAA could be better to achieve the goal of selective precipitation of Cu2+, Cd2+, and Pb2+. The metal sulfide precipitation was measured by field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD).
研究领域:
环境化学
·
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Zhengguo Wu,Weijie Deng,Wei Zhou,Jiwen Luo
As a kind of potential absorbent, polysaccharide materials are limited due to weak stability, low absorption and recovery rate. Herein, a novel composite adsorbent – the magnetic composite gel beads (CMC/SA/graphene oxide@Fe 3 O 4 ) were prepared by combining carboxymethyl chitosan (CMC), sodium alginate (SA) with graphene oxide@Fe 3 O 4 , and then utilized for the adsorption of Cu 2+ , Cd 2+ and Pb 2+ from the wastewater. The physicochemical property of CMC/SA/graphene oxide@Fe 3 O 4 beads were characterized in detail. The CMC/SA/graphene oxide@Fe 3 O 4 magnetic gel beads could separate easily from the wastewater and showed a higher stability due to the addition of graphene oxide@Fe 3 O 4 . The adsorption experiments show that the adsorption of Cu 2+ , Cd 2+ and Pb 2+ on the magnetic gel bead was well fitted with pseudo-second-order model and Langmuir isotherm model, and the maximum adsorption capacity of Cu 2+ , Cd 2+ and Pb 2+ reached 55.96, 86.28 and 189.04 mg/g, respectively. Moreover, the magnetic gel beads had selective adsorption toward Pb 2+ . In addition, the magnetic gel beads still obtained 90% of the adsorption rates after five cycles, and showed good adsorption efficiency in the simulated real environment. This work proves that the CMC/SA/graphene oxide@Fe 3 O 4 magnetic gel beads as the adsorbents have promising potential in wastewater treatment.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Fazal Muhammad Khoso,Mei-Yi Duan,Bi Yang,Guo-Cong Liu,Xi Zhu,Jin-Gang Yu
Cadmium (Cd) pollution in water poses a serious environmental and health threat. GO composites exhibit significant potential as adsorbents for the removal of Cd2+ owing to their large surface area. However, their adsorption performances such as capacity, reusability, and selectivity can be further improved through rational functionalization. A novel RF-GO composite was fabricated through a facile covalent coupling method. The Cd2+ ion adsorption performance of the RF-GO composite was studied through batch adsorption experiments, and process parameter optimization including initial pH, temperature and contact time. The composite's structural morphology, surface functional groups, pore features, and thermal stability were characterized using scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), specific surface area analysis (SSA), and thermogravimetric analysis (TGA). The RF-GO composite exhibited a higher adsorption capacity of 39.58 mg g−1 for Cd2+ at pH = 8. The adsorption kinetics followed the pseudo-second-order kinetic model (R2 = 0.995), demonstrating a chemisorption-dominated process. Equilibrium data were best fitted with the Langmuir isotherm model (R2 > 0.97), suggesting the monolayer adsorption onto uniform active sites. Thermodynamic studies confirmed the endothermic and non-spontaneous nature of adsorption. Notably, the composite exhibited excellent reusability and structural stability, highlighting its potential as a sustainable and selective solution for Cd2+ removal from wastewater.
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Chang Liu,Lu Ren,Xiudong Yang,Yanqi Liu,Huihong Zhang,Wanru Jia,Dawei Zhang
A colorimetric fluorescent probe, 4-(1H-imidazolo[4,5-f][1,10]phenanthroline-2-yl)-N, N-diphenylaniline (PIN), was designed, synthesized and characterized for the sensitive and selective detection of Zn 2+ and Cd 2+ . The color of the solution changed from blue to yellow visible to the naked eye with the addition of Zn 2+ and Cd 2+ . The probe PIN showed good anti-interference to Zn 2+ and Cd 2+ in the presence of a variety of metal ions, and the fluorescence intensity showed a good linear relationship with the concentrations of Zn 2+ and Cd 2+ , with detection limits of 34.84 nM and 35.76 nM, respectively. The probe PIN complexed 2:1 with Zn 2+ and Cd 2+ , and the complexation constants were 1.03 × 10 4 M −1 (PIN − Zn 2+ , R 2 = 0.9971) and 1.50 × 10 4 M −1 (PIN − Cd 2+ , R 2 = 0.9981), respectively. In addition, the PIN could be recovered by EDTA and could be effectively monitored for Zn 2+ and Cd 2+ at pH 4–11, with good results in actual water samples. The HepG-2 cells maintained over 95 % of viability after 24 h exposure to PIN, which identified the extremely low toxic of PIN and could be used for in vivo cell imaging.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Agronomy-Basel
·
2024
·Vol. 14
·期 2
·352
·
IF 3.3
Zihao Ye,Dihao Xu,Jiawen Zhong,Shuang Gao,Jinjin Wang,Yulong Zhang,Huijuan Xu,Yongtao Li,Wenyan Li
The co-transport of contaminants by soil colloids can generate substantial environmental risk, and this behavior is greatly affected by environmental conditions. In this study, AF4-ICP-MS was used to investigate the size distribution and composition of Cd/Pb-bearing colloids; saturated sand column experiments were used to investigate the impact of soil colloids on the transport of Cd/Pb under different pH and ionic strength conditions. AF4-ICP-MS characterization showed that natural colloids were primarily associated with two sizes ranges: 0.3–35 KDa (F1, fine nanoparticles) and 280 KDa–450 nm (F2, larger nanoparticles), which mainly consisted of organic matter (OM), iron (Fe), and manganese (Mn) (oxy)hydroxides and clay minerals. Fine nanoparticles could strongly adsorb Cd and Pb under all environmental conditions. Mn and Fe (oxy)hydroxides generally formed under neutral to alkaline conditions and exhibited adsorption capabilities for Cd and Pb, respectively. Transport experiments were conducted under different pH and ionic strength conditions. At pH 3.0, soil colloids had little effect on the transport of Cd2+and Pb2+. At pH 5.0, soil colloids inhibited the transport of Cd2+by 16.1%, and Pb2+recovery was still 0.0%. At pH 7.0 and 9.0, soil colloids facilitated the transport of Cd2+by 15.6% and 29.6%, facilitated Pb2+by 1.3% and 6.4%. At an ionic strength of 0, 0.005, and 0.01 mol L−1NaNO3, soil colloids facilitated the transport of Cd2+by 77.7%, 45.8%, and 15.6%, only facilitated the transport of Pb2+by 46.2% at an ionic strength of 0 mol L−1NaNO3. At an ionic strength of 0.05 mol L−1NaNO3, soil colloids inhibited the transport of Cd2+and Pb2+by 33.1% and 21.0%, respectively. The transport of Cd2+and Pb2+facilitated by soil colloids was clearly observed under low ionic strength and non-acidic conditions, which can generate a potential environmental risk.
研究领域:
环境科学
·
土壤学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）