ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Li Fu,Bin Zhang,Xiaoyan Long,Kena Fu,Xuwen Gao,Guizheng Zou
Screening a novel electrochemiluminescence (ECL) system is crucial to ECL evolution. Herein, an efficient ECL system with less interference and environmental concern under physiological condition is developed via a unique internal Cu(I)/Cu(II) couple cycling amplified strategy by employing the glutathione- and citrate-capped copper indium sulfide (CIS)/ZnS nanocrystals (NCs) as electrochemiluminophore and N2H4·H2O as co-reactant. CIS/ZnS NCs can be electrochemically injected with valence band (VB) hole at 0.46 and 0.87 V (vs Ag/AgCl), and then achieve the same hole-injected states by relocalizing VB holes with the Cu(I) species inside of CIS/ZnS NCs to form internal Cu(II) defects, while each N2H4·H2O molecule can be successively oxidized to two more reducing species N2H3• and N2H2 around 0.10 V, and inject conduction band (CB) electron onto CIS/ZnS NCs for triple times. The internal Cu(I)/Cu(II) couple cycling involved radiative-charge recombination between these VB hole and CB electron eventually enables two efficient near-infrared ECL processes (around 731 nm) at 0.55 and 0.87 V, in which each single nanocrystal may participate in multiple ECL reaction cycles to produce multiple photons for amplified ECL, similar to the tris(bipyridyl)ruthenium(III) based ECL system. The low-triggering-potential ECL process at 0.55 V can be utilized to selectively determine Cu(II) with a wide linear range from 10 and 1500 nM and a limit of detection of 5 nM (S/N = 3). This work presents a NCs engineering and co-reactant selecting combined strategy for further ECL evolution.
研究领域:
分析化学
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纳米技术
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电化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Guichen Gong,Pan Wang,Jie Liu,Yuexin Han,Yimin Zhu
The effect and mechanism of Cu(II) on the flotation separation of cassiterite from fluorite using styrene phosphonic acid (SPA) as a collector were investigated by flotation tests, zeta potential measurements, X-ray photoelectron spectroscopy (XPS) analysis and density function theory (DFT) calculations. SPA showed good collecting ability for both cassiterite and fluorite, and Cu(II) could intensively and selectively depress fluorite. At pH 4.0, using 100 mg/L SPA as the collector and 5 × 10 −4 mol/L Cu(II) as the inhibitor, a tin concentrate with a grade of 92.3% SnO 2 and a recovery of 85.6% was obtained for an artificially mixed sample which contained 47.86% SnO 2 . Zeta potential and XPS analyses indicated that Cu(II) was anchored on cassiterite surface but not on fluorite surface, and Cu(II) hindered the adsorption of SPA on fluorite but had negligible influence on the adsorption of SPA cassiterite. DFT calculations confirmed that the affinity between Cu(II) and SPA is much stronger than that between Cu(II) and fluorite surface, and the adsorption of SPA on cassiterite surface was not weakened by the presence of Cu(II). Consequently, it was inferred that Cu(II) consumed the collector SPA in the pulp, and the flotation of cassiterite was unaffected but fluorite was depressed by Cu(II). Therefore, Cu(II) is an effective inhibitor for the flotation separation of cassiterite from fluorite.
研究领域:
矿物加工工程
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表面化学
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计算化学
✓ 已验证
DOI
高影响因子
Arabian Journal of Chemistry
·
2020
·
IF 4.762
Zefeng Yu,Weifeng Song,Jiayao Li,Qiuhua Li
In this paper, a metakaolin-based mesoporous geopolymer (GP-CTAB) was used as adsorbent for Cu(II) and Cr(VI) through a novel and simple synthetic route using cetyltrimethylammonium bromide (CTAB) as an organic modifier. The application of GP-CTAB for the simultaneous removal of metal anions and cations in aqueous solution was studied for the first time. The results of X-ray diffraction (XRD) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, Brunauer, Emmett and Teller (BET), and Barrett, Joyner, and Halenda (BJH) methods indicate that GP-CTAB is still geopolymer even in the presence of quaternary ammonium salt cations. The material was tested to simultaneously adsorb Cu(II) and Cr(VI) from an aqueous solution. The results show that GP-CTAB can adsorb anions simultaneously without sacrificing the adsorption properties of heavy metal cations, which is superior to conventional geopolymers. The maximum theoretical adsorption capacity of GP-CTAB for Cu(II) and Cr(VI) was 108.2 mg/g and 95.3 mg/g in the binary system, respectively. It was also found that the presence of Cu(II) in the solution promoted the adsorption of Cr(VI). Given this characteristic of GP-CTAB, it has shown great application prospects in the prevention and control of heavy metal pollution.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 25
·期 4
·3922-3932
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IF 2.741
Yi Xiaofeng,Yang Meixia,Mo Liuda,Xu Wenkai,Wang Shuai,He Jiarui,Gu Junjie,Ou Minrui,Xu Xiaoping
Copper in drinking water causes a significant environmental problem. Composite material based on alginate hydrogel has been gaining attention in the field of Cu(II) adsorption. However, alginate-based hydrogel exhibits poor mechanical property and relative low adsorption capacity which limit their application. The present study is devoted to the modification of chitosan/calcium alginate/Fe 3 O 4 (CAF) hydrogel microsphere by NaOH solution for enhancement of Cu(II) adsorption. Results reveal that modification of CAF via NaOH solution significantly improves the mechanical strength and Cu 2+ adsorption capacity of pristine materials. FTIR and XRD analysis confirms that CAF and newly prepared materials (NACAF) are successfully prepared. SEM and EDX are employed to analyze the surface morphology and elemental composition, respectively, both before and after their loading with Cu 2+ . XPS study demonstrates adsorption mechanism is based on chelation and ion-exchange. Compressive stress-strain curves demonstrate NACAF has better mechanical performance than CAF. The adsorption kinetics of the two adsorbents follow a pseudo-second-order model. The equilibrium data were best described by Langmuir isotherm model, and the estimated maximum equilibrium sorption capacity, q
m ,is 261.31 mg/g for the NACAF, which is larger than that of CAF (145.39 mg/g). Hence, NACAF shows excellent mechanical strength and high sorption capacity for Cu 2+ . It has great potential for Cu(II) removal in aqueous solutions.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Ying Cai,Shihao Shen,Jinhong Fan
This study applied a mineral material of FeS to activate sulfite for efficient degradation of TTC in the presence of Cu(II) based on the identified complexation mechanism through UV–Vis spectra, FTIR spectroscopy and DFT calculation . pH plays an important role in TTC degradation and the initial pH of 6 and 7 were the divide in the contributions of FeS/sulfite oxidation and complex-precipitation. TTC-Cu(II) exhibits a superior promoting effect on the TTC degradation in FeS/sulfite system due to the improvement of TTC electron transfer reactivity and Fe(II) dissolution from FeS. Moreover, the formation of Cu(I) improved the recycling of Fe(II) from Fe(III). Dissolved oxygen-dependent free radicals’ generation was confirmed, and TTC degradation was mainly attributed to SO 4 ·− and ·OH. The characterization of FeS surface through XPS, XRD , SEM-EDS, Fe(II) deactivation tests, together with the comparison of pseudo-first-order rate constants for TTC degradation by FeS and ferrous ion supported the important role of surface and dissolved Fe(II) in sulfite activation . Furthermore, reasonable degradation pathways of TTC have been proposed according to the detected products by LC-MS. This work highlights the important role of pH, DO and Cu(II) complexation in sulfite activation and TTC degradation, furnishing theoretical support for further relevant studies.
研究领域:
环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Jun Wu,Wenzhong Zhang,Chunping Li,Erdan Hu
The effects of Fe(III) and Cu(II) on the sorption of atrazine (AT) and prometryn (PY) on clay minerals were investigated both preloaded and in solution. For smectite , Fe(III) preloading greatly enhanced AT and PY sorption at pH 4.0 and 6.0 but diminished AT sorption at pH 8.0. Cu(II) preloading promoted AT and PY sorption under alkaline conditions but suppressed AT sorption at pH 4.0. The adverse effects were not obvious for PY. While for illite and kaolinite , Fe(III) and Cu(II) had little or promotion effects due to the lower contents of them in these two minerals. In the co-sorption studies, for smectite, AT sorption remained at pH 4.0 and increased at pH 6.0 and 8.0, while PY sorption was inhabited over the pH range of 4.0–8.0 in the presence of Fe(III). AT and PY sorption were not affected by Cu(II) except for PY at pH 8.0, in which case, the sorption was promoted. For illite and kaolinite , Fe(III) and Cu(II) generally enhanced AT and PY sorption.
研究领域:
环境科学
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土壤学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Hang Yin,Qiuqiu Xiong,Miao Zhang,Bowen Wang,Fenge Zhang
In this study, magnetic composite microspheres (SCFP) were prepared by cross-linking chitosan (CS), sodium alginate (SA), poly(vinyl alcohol) (PVA), and ferric tetraoxide (Fe 3 O 4 ) in a CaCl 2 solution. CS and Fe 3 O 4 were encapsulated in gel spheres formed by cross-linking SA with Ca(II), while PVA facilitated the dispersion of CS in SA. SCFP was utilized as an adsorbent to remove Cu(II) from water. The effects of the initial pH of the solution, SCFP dosage, and initial Cu(II) concentration on the adsorption efficiency were investigated through batch experiments. The results demonstrated that the adsorption capacity reached 58.260 mg/g (removal rate = 97.1%) after 100 min of adsorption at a pH of 5. The removal rate remained above 90% even after 6 cycles of the cycling experiment. The incorporation of CS with other functional materials allowed SCFP to compensate for its inherent drawbacks such as low mechanical strength, poor acid resistance, and short service life. The pseudo-first-order kinetic model and Freundlich adsorption isotherm provided better descriptions of the adsorption process. A comprehensive analysis was conducted on the structure and adsorption mechanism of SCFP using characterization techniques such as SEM-EDS, FTIR , BET, XRD , etc. In summary, SCFP has the potential to be an excellent environmentally friendly material for the removal of Cu(II).
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Hongyan Zhang,Jiehui Huang,Yuxiang Shen,Zuofang Yao,Chenchen Xing,Yanping Hou
Z-Scheme heterojunction photocatalysts can effectively suppress the recombination of charge carriers while maintaining high redox capacity. In this study, ZnTe/WO 3 (ZW) Z-scheme heterojunction photocatalysts were synthesized using a hydrothermal method, and a series of photocatalytic materials were prepared for the simultaneous removal of tetracycline (TC) and Cu(II) from water. The physicochemical and photoelectrochemical properties of the catalytic materials were characterized through various methods, including SEM, XRD, XPS, and others. The experimental results indicate that the ZW-10 % composite material exhibits the most significant removal efficiency for pollutants. Within 150 min of visible light irradiation, the removal rates for TC and Cu(II) reach 73.8 % and 73.3 %, respectively, representing a substantial improvement compared to individual ZnTe and WO 3 . Free radical capture experiments and electron spin resonance analysis reveal that ·O 2 − and ·OH are the key reactive species responsible for TC oxidation, while electrons (e − ) dominate the reduction of Cu(II).
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Processes & Impacts
·
2014
·Vol. 16
·期 6
·1462-1468
·
IF 0
Lin Duan,Lingfang Li,Zhu Xu,Wei Chen
Nano-sized nickel oxide (nano-NiO) is a new nanomaterial that has shown great promise in many areas of application. Understanding its environmental fate and effects is critical for minimizing the potential environmental implications of this new material due to incidental and accidental releases in the future. In this study, we observed strong adsorption of tetracycline to nano-NiO and found that the adsorption affinity can be further enhanced by Cu(II) ions – the observed distribution coefficient (Kd) values are 103.1 to 104.2 L kg−1 in the absence of Cu(II) and 103.0 to 105.5 L kg−1 in the presence of Cu(II); such adsorption affinities are even comparable to those of tetracycline to carbonaceous materials. The strong adsorptive affinities of nano-NiO for tetracycline are likely attributable to several mechanisms, including surface complexation, cation exchange, and electrostatic attraction. As a strong complexing agent, Cu(II) can significantly enhance adsorption of tetracycline by serving as a bridging agent between tetracycline and nano-NiO. The findings of this study have important implications for the risk assessment of engineered nanomaterials – in aquatic environments nano-NiO (and likely other metal oxide nanomaterials) can strongly adsorb tetracycline antibiotics, resulting in the changes of environmental risks of the metal oxide nanomaterials and/or bioavailability of the adsorbed contaminants.
研究领域:
环境科学
·
纳米技术
✓ 已验证
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Mingxian Duan,Yeshuang Wang,Huiling Fan,Zhelin Su,Chao Yang,Jiawei Kou,Ju Shangguan
Thiophene (C 4 H 4 S) removal from coke oven gas is critical to its subsequent high valuable utilization but remains a challenge. MOF-199 was considered as a promising candidate for C 4 H 4 S adsorption removal owing to its nature of enriched opened Cu sites. However, the presence of mixed valence of Cu(II) and Cu(I) in MOF-199 makes it puzzling to their respective contribution to the removal of C 4 H 4 S. Herein, a series of MOF-199 with different Cu(I) contents were synthesized using different methods, including hydrothermal, solution diffusion, and ultrasonic, and their C 4 H 4 S adsorption performance were investigated. The respective contributions of Cu(II) and Cu(I) to the C 4 H 4 S removal was systematically discussed. The collected results indicated that although the samples prepared with different methods present a remarkable difference in textural characters, the latter was found to have a negligible influence on the C 4 H 4 S removal owing to MOF-199(H) affording an inferior surface area and pore volumes but performing the best C 4 H 4 S removal capacity of 53.7 mg S/g. The co-adsorption results of CH 3 SCH 3 and C 4 H 4 S indicated that the excellent performance of MOF-199(H) mainly attributed to the presence of Cu(I), which provides active sites for C 4 H 4 S adsorption through π complex coordination. Cu(II) species was also found to the C 4 H 4 S adsorption via soft-acid-base coordinated interaction, but its contribution is 8.3 mg S/g, only accounting for 15.5 %. Additionally, the adsorption of C 4 H 4 S on MOF-199(H) was found to follow the intra-particle diffusion model and the Langmuir models. Moreover, MOF-199(H) also exhibited an excellent regeneration performance due to the weak interaction between C 4 H 4 S and their opened Cu sites, the C 4 H 4 S adsorption capacity still reaches 50.6 mg S/g after three regeneration cycles, about 94 % of its initial value. The results collected in this study will provide new insights for the manipulation of performance of C 4 H 4 S adsorption on the MOF-199.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Shuhui Sun,Chao Shan,Zhichao Yang,Shu Wang,Bingcai Pan
Phosphonate is an important category of highly soluble organophosphorus in contaminated waters, and its oxidative transformation into phosphate is usually a prerequisite step to achieve the in-depth removal of the total phosphorus. Currently, selective oxidation of phosphonate into phosphate is urgently desired as conventional advanced oxidation processes suffer from severe matrix interferences. Herein, we employed 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) as a model phosphonate and demonstrated its efficient and selective oxidation by the Cu(II)/H2O2 process at alkaline pH. In the presence of trace Cu(II) (0.020 mM), 90.8% of HEDP (0.10 mM) was converted to phosphate by H2O2 in 30 min at pH 9.5, whereas negligible conversion was observed by UV/H2O2 or a Fenton reaction (pH = 3.0). The oxidation of HEDP by Cu(II)/H2O2 was insignificantly affected by natural organic matters (10.0 mg TOC/L) and various anions including chloride, sulfate, and nitrate (10.0 mM). The complexation of Cu(II) with HEDP coupling Cu(III) produced in situ enabled an intramolecular electron transfer process, which features high selective oxidation. Selective degradation of HEDP was further validated by adding stoichiometric H2O2 into an industrial effluent, where the existing Cu(II) could serve as the catalyst. This study also provides a successful case to trigger selective oxidation of trace pollutants of concern upon synergizing with the nature of the contaminated water.
研究领域:
环境科学
·
水处理技术
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Dehua Deng,Lin Liu,Yingping Bu,Xiuhua Liu,Xuezhen Wang,Bing Zhang
This work demonstrated that electrochemical sensing devices can be fabricated by electrocatalytic water oxidation. First, we suggested that the Cu(II) complexes with amino terminal Cu(II)- and Ni(II)-binding (ATCUN) peptides showed good electrocatalytic ability toward water oxidation. In contrast to the previously reported electrocatalysts for water oxidation, the ATCUN-Cu(II) electrocatalysts can operate at neural pH with lower oxidation potential. Furthermore, the ATCUN-Cu(II) metallopeptides can be easily modified onto the surface of nanomaterials to produce nanocatalysts for water oxidation. To demonstrate the analytical performances of the ATCUN-Cu(II) electrocatalysts as electrochemical signal labels, DNA analysis was performed in a sandwich option using gold nanoparticles (AuNPs) as the carriers. The method detected DNA down to 0.1 pM. This is the first time that H 2 O molecule was employed as the electrocatalytic substrate in electrochemical sensing devices.
研究领域:
生物化学
·
分析化学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）