Analytical Methods
·
2019
·Vol. 11
·期 34
·4382-4389
·
IF 2.378
Fanglin Ming,Jingzhou Hou,Danqun Huo,Jun Zhou,Mei Yang,Caihong Shen,Suyi Zhang,Changjun Hou
A luminescent amino-functionalized metal–organic framework (Cu–MOFs) was synthesized from 2-aminoterephthalic acid and Cu(II) ions by a solvothermal method. Cu–MOFs displayed blue fluorescence with a peak at 430 nm under 330 nm excitation. Its structure was characterized by FTIR, TEM, XRD, and XPS. The fluorescence of the Cu–MOFs was quenched by Fe3+ in aqueous solutions. The limit of detection was 0.5 μM, and the linear working range extended from 2 μM to 35 μM. Additionally, a good logarithmic relationship between relative fluorescence intensity (F/F0) and Fe3+ concentrations ranging from 2 to 180 μM was obtained with a detection limit of 1.56 μM (R2 = 0.9975). No clear interference was observed when challenged with a wide variety of cations and anions. The recoveries from spiked real water samples were in the range of 91.7–107.7%, and the detection results were consistent with inductively coupled plasma mass spectrometry (ICP-MS) results. Therefore, the fluorescent sensor has great potential in environmental monitoring.
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FOOD AND AGRICULTURAL IMMUNOLOGY
·
2018
·
IF 2.568
Zhi-Li Xiao,Wei Tian,Zhen-Lin Xu,Yuan-Ming Sun
In this study, we develop a sensitive indirect competitive chemiluminescent enzyme immunoassay (ic-CLEIA) to detect cadmium (Cd) in cereals. A luminol-hydrogen peroxide chemiluminescence system catalysed by horseradish peroxidase (HRP) was used as the signal detecting system. The method showed a half-maximal inhibition concentration (IC50) of 0.5 ng/mL and a limit of determination (LOD) of 0.06 ng/mL. The assay indicated an effective linear range from 0.16 to 1.56 ng/mL. There were no obvious cross-reactivities with other metal ions, including Hg2+, Pb2+, As2+, Ag+, Fe3+, Cu2+, Cr2+, Au3+, Ca2+, Mg2+, Mn2+ and Zn2+. Recovery rates ranged from 79.2% to 120.0% for rice, maize, wheat, brown rice and glutinous rice samples. Twenty-five practical cereal samples were analysed, and the comparative analysis of the results showed a strong correlation (r = 0.984) between the CLEIA and the GFAAS methods. The results indicated that the ic-CLEIA developed was acceptable to screen for cadmium in cereal samples.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xueli Zhou,Weizhen Liu,Jian Zhang,Can Wu,Xinwen Ou,Chen Tian,Zhang Lin,Zhi Dang
Calcium carbonate from geological sources (geo-CaCO3, e.g., calcite, aragonite) is used extensively in removing heavy metals from wastewater through replacement reaction. However, geo-CaCO3 has an intrinsically compact crystalline structure that results in low efficiency in pollutant removal and thus its use may produce enormous sludge. In this work, biogenic calcium carbonate (bio-CaCO3) derived from oyster shells was used to remove Pb(II) from wastewater and found to significantly outperform geo-CaCO3 (calcite). The thermodynamics study revealed that the maximum adsorption capacity of bio-CaCO3 for Pb(II) was three times that of geo-CaCO3, reaching up to 1667 mg/g. The kinetics study disclosed that the dissolution kinetics and the rate of intraparticle diffusion of bio-CaCO3 were faster than those of geo-CaCO3. Extensive mechanism research through X-ray powder diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption/desorption test and mercury intrusion porosimetry showed that the hierarchical porous organic–inorganic hybrid structure of bio-CaCO3 expedited the dissolution of CaCO3 to provide abundant CO32– active sites and facilitated the permeation and diffusion of Pb(II) into the bulk solid phases. In addition, Fourier transform infrared spectroscopy (FTIR) study, X-ray photoelectron spectroscopy (XPS) analysis, and the examination of Pb(II) removal ability of bio-CaCO3 after calcination indicated that the organic functional groups of bio-CaCO3 also facilitated the immobilization of Pb(II) into CaCO3 particles, although the major contribution was from the hierarchical porous structure of bio-CaCO3.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Ni Wei,Chundong Yang,Yan Su,Chenhuan Lai,Qiang Yong
To investigate the disparate effects of carbocation scavengers on promoting the enzymatic hydrolysis of softwood and hardwood, five carbocation scavengers were supplemented during acid pretreatment of masson pine and poplar in this study, including 2-naphthol (2 N), 2-naphthol-7-sulfonate (NS), p -hydroxybenzoic acid (PB), vanillic acid (VA) and syringic acid (SA). The results showed that naphthols (2 N and NS) with only one nucleophilic site enhanced delignification and enzymatic hydrolysis more significantly than the monophenols with several reactive sites. Adding 2 N and NS increased the hydrolysis yield of acid-pretreated masson pine (AM) from 14.87% to 20.58% and 35.52%, respectively. Correspondingly, the hydrolysis yield of acid-pretreated poplar (AP) improved from 56.54% to 80.47% and 86.9%, respectively. Moreover, as pretreatment severity increased, the enzymatic digestibility of AM and AP first increased and then decreased. However, the naphthols modification retarded this decline, especially for the enzymatic hydrolysis of pretreated poplar. The structure of carbocation scavengers and the lignin unit composition jointly determined the improvement on enzymatic hydrolysis of woody biomass by carbocation scavengers. Furthermore, the naphthols promoted the enzymatic hydrolysis mainly by alleviating enzyme non-productive binding.
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MOLECULES
·
2024
·Vol. 29
·期 13
·3046
·
IF 4.2
Jingyi Zhang,Congmei Lin,Feng Li,Xinhao Wei,Yusen Chen,Yanyong Fu,Xiaoping Yu,Biao Zhang,Zihong Ye
Cancer is one of the major public health challenges in the world, which is characterized by rapid progression and high mortality. Immunotherapy, represented by PD-1 monoclonal antibody, has significantly improved the efficacy of malignant tumors and has become one of the most popular immunotherapy methods at present. Therefore, there is an increasing demand for novel detection methods for PD-1 monoclonal antibodies. The aim of this work was to establish a rapid, simple, and sensitive immunochromatographic test strip (ICTS) based on the AuNPs enlargement for both visual and instrumental detection of the PD-1 monoclonal antibody concentration. The mixed solution of NH2OH·HCl and HAuCl4was used as an enhancement solution to lower the detection limit and achieve higher sensitivity. A test strip reader was used to construct a visualized quantitative detection standard curve for the PD-1 monoclonal antibody concentration. The LOD was 1.58 ng/mL through a triple signal-to-noise ratio. The detection time was within 10 min. The constructed test strips can rapidly, accurately, and efficiently detect the concentration of PD-1 monoclonal antibody in real samples.
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PubMed
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Jun-Qiu Zhang,Xiao-Fang Shen,Jun Liu
Malachite green (MG), a widely used antiparasitic agent, poses health risks to human due to its genotoxic and carcinogenic properties. Herein, a stable dual-emission fluoroprobe of carbon dots/copper nanoclusters is prepared for highly selective detection of MG based on the inner filter effect. This probe exhibits characteristic emission bands at 435 and 625 nm when excited at 376 nm. After adding MG, the both emission signals were significantly quenched, and the ratio of fluorescence intensity (F 435 /F 625 ) was linearly related to the concentration of MG in the range of 0.05–40 μmol L −1 with a limit of detection of 18.2 nmol L −1 . Meanwhile, the two signals exhibit linear relationships with the concentration of MG, respectively, and the corresponding detection results were consistent. The fluoroprobe was successfully used for the detection of MG in fish samples with the recoveries ranging from 96.0% to 103.8% and a relative standard deviation of <3.3%.
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NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 18
·9649-9657
·
IF 3.269
Linjian Li,Kun Zhang,Li Chen,Zhong Huang,Guangbin Liu,Mingfang Li,Yangping Wen
Agroforestry waste being used as biochar, for agricultural, environmental and climatic applications, has attracted considerable attention, but there are few reports on biochar as electrode modified materials and solid fuel briquettes. In this paper, we demonstrated a new strategy for the mass preparation of micro/nano-powders of biochar with water-dispersibility and their potential applications in different fields. Ultra-fine powders of biochar were easily obtained through pyrolyzing fine powders of smashed biomass waste based on pitch pine at high temperature under oxygen-limited conditions. Micro/nano-powders of biochar were facilely prepared through milling and sieving ultra-fine powders of biochar. Water-dispersible biochars were easily developed through sonicating and centrifugally separating micro/nano-powders of biochar. The structures and properties of two biochar types were characterized, and upper-layer biochar was more steadily dispersed in water and of a smaller size than lower-layer biochar, which was mainly employed as an electrode material in a Pb2+ voltammetric sensor and as solid fuel briquettes for pellet biofuels, and other preliminary applications like use as rice bio-fertilizers and Pb2+ bio-adsorbents also were given. The satisfactory results indicated that micro/nano-structured and/or water-dispersible biochar will provide promising platforms for electrochemical applications as electrode materials, as a cleaner and renewable alternative to coal fuel, and for other uses, like as bio-fertilizers for crop seedling and growth, and as bio-adsorbents for the removal of hazardous substances.
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RSC Advances
·
2016
·Vol. 6
·期 100
·97523-97531
·
IF 3.289
Yichang Yu,Zhangjun Hu,Zhenyong Chen,Jiaxiang Yang,Hongwen Gao,Zhiwen Chen
A disulfide-grafted polyethyleneimine (PES)@Mg2SiO4 composite was synthesized, characterized, and used successfully to remove heavy metals from wastewater. It was grafted with a huge number of dithiocarbamate moieties as sites for specific adsorption. By comparative studies, it was found that the morphology, structure and properties were influenced by the trapped organic components in the composites. PES@Mg2SiO4 exhibits a larger specific surface area and better adsorption activity compared with Mg2SiO4, polyethyleneimine (PEI)@Mg2SiO4 and PEI@Mg2SiO4–CS2. The adsorption behaviors of the obtained composites were investigated for the recovery of Hg2+, Pb2+ and Cd2+. PES@Mg2SiO4 shows the highest adsorption capacities of 714 mg g−1 for Hg2+, 400 mg g−1 for Pb2+ and 323 mg g−1 for Cd2+, which fits the Langmuir isotherm model. Besides this, it also exhibits excellent adsorption capacity for Cu2+, Bi3+ and metal complexes. Its application in petrochemical wastewater demonstrates its enormous potential for heavy metal wastewater treatment.
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INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Molin Zhou,Xingxing Jiang,Yangwu Guo,Zheshuai Lin,Jiyong Yao,Yicheng Wu
By combining different nonlinear optical-active structural chromophores with transition metal Mn into a crystal structure, two novel quaternary metal chalcogenides Pb0.65Mn2.85Ga3S8 (1) and Pb0.72Mn2.84Ga2.95Se8 (2) were successfully synthesized. Compounds 1 and 2 are isostructural, and they represent a new structure type that crystallizes in the space group P6̅ (No. 174) in the hexagonal system. Their structures feature an interesting three-dimensional open-tunnel framework composed of bridged infinite chains with Pb2+ cations filling in the biggest tunnels. Interestingly, both 1 and 2 demonstrate intense second harmonic generation responses at 2.09 μm that is about 1.5 and 4.4 times, respectively, of that of the benchmark material AgGaS2. However, 1 and 2 possess different optical diffuse reflectance spectra: 1 displays an evident multiband absorption characteristic with two distinguishing absorption edges of 738 and 551 nm, corresponding to two band gaps of 1.68 and 2.25 eV, respectively, while 2 exhibits only one sharp edge, and the corresponding band gap was estimated to be 1.65 eV. Moreover, apart from the considerable structural similarity between 1 and 2, the dc temperature dependent susceptibility measurements indicate that compound 1 is paramagnetic, while compound 2 exhibits spin-glass-like behavior.
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MATERIALS & DESIGN
·
2016
·
IF 3.997
Xinjian Cheng,Yun Yu,Yiru Jia,Lian Duan
Three small molecular boron dipyrromethene (BODIPY) derivatives (B3a, B3b and B3c) were well-designed and synthesized at first, and then were incorporated into polyurethane to obtain macromolecular fluorescent sensors. These small molecular BODIPY derivatives exhibited high sensitivity and selectivity to Hg 2 + , Cr 3 + and Fe 3 + ions. The colors of these chemicals changed rapidly upon the addition of Hg 2 + , Cr 3 + and Fe 3 + ions. In addition, their fluorescence peaks shifted and was enhanced as well. B3a, B3b and B3c still remained the sensing properties when being introduced to polyurethane (PU). The functionalized PU films not only showed color change and fluorescence shift for detecting Hg 2 + , Cr 3 + and Fe 3 + ions as their small molecular counterparts, but also triggered a new emission peak in 500–600 nm. Besides, the functionalized PU film (PU-B3a as a sample) could absorb Hg 2 + ions more than 84 mg/g in unit time and volume. It suggested that as long as the structure of the small molecular sensor was remained, the fluorescent ability remained even it is introduced to the macromolecular chains. In addition, Glass transition temperature (T g ) of the PU films changed when B3a, B3b and B3c were introduced.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2014
·Vol. 30
·期 3
·362-367
·
IF 1.119
Cao Li,Jia Chunman,Zhang Qi,Chen Da,Zhang Chunyan,Qian Yaao
A fluorescent probe with a coumarin moiety bound to rhodamine 6G hydrazide( 1 ) was synthesized. Its sensing behavior toward various metal ions was investigated with fluorescence methods. Compound 1 displays different fluorescence emission responses to Al 3+ and Ca 2+ at the same excitation wavelength in the visible light region, while no changes occur after the addition of other metal ions. The binding ratios of the complexs of 1 -Al 3+ and 1 -Ca 2+ are both 2:1 according to the Job plot and high resolution mass spectrometer(HRMS) experiments. Moreover, emission spectrum of 1 -Ca 2+ complex and absorption spectrum of the rhodamine dyes overlap largely. When Al 3+ was added to the 1 -Ca 2+ system, calcium in complex 1 -Ca 2+ can be displaced by Al 3+ , resulting in the output of another ratiometric sensing signal, which demonstrates that the 1 -Ca 2+ complex can be served as a new and effective fluorescence resonance energy transfer(FRET) donor for rhodamine derivatives.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2014
·Vol. 22
·期 7
·5563-5571
·
IF 2.757
Li Yu-jiao,Hu Peng-jie,Zhao Jie,Dong Chang-xun
Composite washing of cadmium (Cd)- and lead (Pb)-contaminated agricultural soil from Hunan province in China using mixtures of chlorides (FeCl 3 , CaCl 2 ) and citric acid (CA) was investigated. The concentrations of composite washing agents for metal removal were optimized. Sequential extraction was conducted to study the changes in metal fractions after soil washing. The removal of two metals at optimum concentration was reached. Using FeCl 3 mixed with CA, 44 % of Cd and 23 % of Pb were removed, and 49 and 32 % by CaCl 2 mixed with CA, respectively. The mechanism of composite washing was postulated. A mixture of chlorides and CA enhanced metal extraction from soil through the formation of metal–chloride and metal–citrate complexes. CA in extract solutions promoted the formation of metal–chloride complexes and reduced the solution pH. Composite washing reduced Cd and Pb in Fe–Mn oxide forms significantly. Chlorides and CA exerted a synergistic effect on metal extraction during composite washing.
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