INORGANIC CHEMISTRY
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2023
·
IF 4.6
Xiao-Yi Liu,Qiu-Ying Lin,Han Fang,Xing-Wang Li,Shu-Ming Zhang,Mei-Hui Yu,Ze Chang
Metal–organic frameworks (MOFs) have been recognized as a potential platform for the development of tunable luminophores owing to their highly modulable structures and components. Herein, two MOF luminophores based on Cd(II) ions, 1,3,5-tri(4-pyridinyl)benzene (TPB), and 1,4-dicarboxybenzene (H2BDC) were constructed. The directed assembly of the metal ions and organic linkers results in [Cd2(BDC)2(TPB)(H2O)]·x(solvent) (MOF-1) featuring TPB-based blue fluorescence centered at 425 nm. By introducing anthracene as the structure directing agent (SDA) for assembly regulation, [Cd2(BDC)(TPB)2(NO3)2]·x(solvent) (MOF-2) was obtained, which reveals anthracene feeding-dependent high tunable emission in the 517–650 nm range. Detailed components, photophysical properties, and structural characteristics investigations of MOF-2 indicate the TPB and NO3– interactions as the origin of its redshifted emission compared with that of MOF-1. Furthermore, the fluorescence of MOF-2 was found to be regulatable by the anthracene feeding based on the SDA-determined crystallinity of the crystalline sample. All these results provided a unique example of the structural and fluorescence regulation of MOF luminophores.
研究领域:
材料科学
·
化学
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DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2026
·
IF 7.9
Yuzhi Zhou,Linli Long,Jingyu Sun,Zongyao Li,Jingwei Niu,Jinming Duan,Min Chen,Boyu Wang,Xiaoyang Chen
Coal gangue (CG) is a mixture of abundant SiO 2 and Al 2 O 3 , and greatly suitable for the synthesis of zeolites. In this work, a cost-effective and eco-friendly tannic acid modified zeolite (zeolite@TA) was successfully developed via alkali melting-hydrothermal synthesis of zeolite from CG and followed by the modification of tannic acid onto zeolite surface using the dip-coating method. Organic additive-free fabrication process rendered zeolite@TA synthesis eco-friendly and cost-effective process. Various characterization results revealed the formation of zeolite structure, and tannic acid coating on zeolite. The results demonstrated that the zeolite@TA displayed a notable enhancement for Cd(Ⅱ) adsorption capacity, outperforming the zeolite derived from coal gangue, and zeolite@TA with a maximum theoretical Cd(Ⅱ) adsorption capacity of 184.5 mg/g exceeded zeolite (66.09 mg/g) by approximately 2.8-fold. From adsorption kinetic tests, the kinetic analysis confirmed pseudo-second-order model dominance. Among coexisting ions (Na⁺, K⁺, Mg²⁺ and NH₄⁺), Ca 2+ exhibited the strongest inhibitory effect on Cd(Ⅱ) adsorption. Thermodynamic parameters (△G°＜0, △H°＞0,△S°＞0) revealed the nature of spontaneous, endothermic and entropy-increasing process for zeolite@TA. Overall, Strategic utilization of coal gangue as a primary resource will establish a foundation for new waste-free technological solutions with dual economic-environmental benefits, and is equipped a prospective development space on wastewater cleanup applications.
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DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2020
·
IF 3.333
Pu Yang,Hui Cao,Di Mai,Tai Ye,Xiuxiu Wu,Min Yuan,Jingsong Yu,Fei Xu
A Cd(II) ion-imprinted polymers (SOS@Cd(II)-IIPs) with specific recognition property and high adsorption capacity was synthesized on a novel spheres-on-sphere (SOS) particle surface. Then, the obtained SOS@Cd(II)-IIPs were characterized and applied in solid phase extraction (SPE) column for the preconcentration of cadmium in real samples. The affinity constant (K ITC ), reaction enthalpy (ΔH), and entropy (ΔS) of Cd(II) binding to monomers (3-mercaptopropyl trimethoxysilane, MPTMS) were also determined by isothermal titration calorimetry (ITC) to analyse their adsorption mechanism. The coordination binding of Cd(II) to MPTMS was demonstrated as an exothermic process with a high K ITC value of 1.60×10 5 M −1 and an enthalpy value of −9.54 kJ∙mol −1 . The binding reaction was mainly driven by both enthalpy and entropy, and can be completed spontaneously at any temperatures. The SOS@Cd(II)-IIPs synthesized on the SOS particle surface exhibited a maximum adsorption capacity of 41.212 mg∙g −1 for Cd(II). Meanwhile, the SOS@Cd(II)-IIPs also showed a specificity recognition ability for Cd(II) using analogues Cu(II), Pb(II), Cr(II), and Ni(II) as interference. In real samples, SOS@Cd(II)-IIPs based SPE can extract approximately 95–105% of Cd(II) with a RSD of 3.41%–8.12%, indicating that it could have wide application prospects in Cd(II) adsorption and detection.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Jiahui Deng,Yalin Cheng,Min Liu,Biyang Tu,Shan Xue,Haisheng Tao
In this study, Fe-Mn co-embed sodium alginate carbon spheres (Fe-Mn/SA-C) were prepared as a cost-effective adsorbent for aqueous Cd(II) removal by a facile pyrolysis method. The morphology and chemical composition of Fe-Mn/SA-C were explored with various characterized techniques. The results indicate that Fe-Mn/SA-C possess porous structures and abundant oxide-based functional groups. Fe-Mn/SA-C exhibits excellent adsorption properties for aqueous Cd(II) and the adsorption process is pH-dependent. The adsorption data could fit pseudo second-order and Langmuir models well, suggesting that chemisorption is a dominant adsorption mechanism and the maximum adsorption capacity is 280.11 mg −1 . Thermodynamic analysis demonstrates that the adsorption is spontaneous and endothermic. The adsorption mechanisms of Cd(II) include the complexation of Cd(II) with oxygen-based functional groups, precipitation, and ion exchange. Finally, the granulated and magnetic Fe-Mn/SA-C is an efficient and practical adsorbent for cadmium-containing wastewater treatment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jun Mao,Xianlin Lei,Xiyao Fu,Zhiping Chen,Hongxiang Zhu,Fei Xue,Zihan Yu,Lei Wang,Nannan Xia,Hui He
Extracting cellulose from agricultural residues and converting it into environmentally friendly adsorbents to solve the heavy metal contamination problem of groundwater and farmland is an effective strategy to achieve high-value utilization of agricultural residues. Herein, we propose a streamlined crosslinking strategy to fabricate a cellulose-based amphoteric hyperbranched adsorbent (MAHPA) in a controlled manner. The strategy involves synthesizing the amphoteric hyperbranched functional reagent first and then crosslinking it with microcrystalline cellulose (MCC). This approach simplifies the complexity of the multi-component cross-linking system, resulting in a conversion rate of reaction reagents exceeding 99 %. MAHPA, with a three-dimensional hyperbranched structure (degree of branching: 0.77), exhibits a high swelling rate (247.62 %) and high densities of carboxyl (7.05 mmol·g −1 ) and amino (8.27 mmol·g −1 ) groups. Moreover, the cellulose-hyperbranched double-network structure of MAHPA greatly enhances the intramolecular diffusion kinetics of heavy metal ions on MAHPA, enabling it to complete the removal of low concentrations of Cr(VI), As(V), Pb(II), and Cd(II) within 20 min. Interestingly, MAHPA demonstrates excellent synchronous capture performance for Cr(VI), As(V), Pb(II), and Cd(II) in groundwater at a velocity of 1.60 × 10 −2 m·s −1 . Meanwhile, applying MAHPA can realize the safe utilization of Cd-As contaminated soil. This work offers a general strategy for the structural design of cellulose-based hyperbranched adsorbent holding great promise as heavy metal contaminated groundwater and soil remediation field.
研究领域:
环境科学
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材料科学
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农业科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Renlu Liu,Bin Lian
Ubiquitous calcium carbonate (biogenic or abiotic) exerted an important impact on the migration and transformation of heavy metal in the environment. Cd(II) pollution, common in China, has attracted much attention due to its critical toxicity. The purpose of this study is to compare the differences in adsorption and desorption characteristics of Cd(II) between biogenic CaCO 3 (BCa) induced by Bacillus subtilis and abiotic CaCO 3 [AR (analytical reagent grade)-CaCO 3 and limestone]. The results show that the adsorption data of BCa and abiotic CaCO 3 for Cd(II) more closely followed the Langmuir model compared to the Freundlich model. The maximum adsorption capacity (obtained from Langmuir isotherm) of BCa for Cd(II) (172.41 mg/g) was significantly greater than that of abiotic CaCO 3 (AR-CaCO 3 : 6.31 mg/g, limestone: 21.01 mg/g), and its maximum desorption rate (1.48%) was significantly lower than that of abiotic CaCO 3 (AR-CaCO 3 : 74.30%, limestone: 5.65%). Furthermore, the adsorption process of BCa is a spontaneous endothermic reaction and obeys pseudo-second-order kinetics. The obvious advantages of BCa are that it is easily obtained by bacterial culture, and another is its stronger immobilisation of Cd(II) compared to abiotic CaCO 3 , giving a promising potential for heavy metal remediation.
研究领域:
环境科学
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微生物学
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DOI
PubMed
高影响因子
Sustainability
·
2020
·Vol. 12
·期 19
·7931
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IF 2.576
Sanmei Li,Mingda Wu,Linghong Lu,Jiabao Zhu
Humin is the waste residue from the process of preparing humic acid, which accounts for a large proportion of the raw material (weathered coal humic acid). Its Cd(II) adsorption performance is far inferior to that of humic acid. How to regenerate humin is of great significance to the low-cost treatment of Cd(II) pollution in wastewater. In this study, humin was modified by hyperbranched polyethyleneimine to enhance the adsorption capacity for Cd(II). Fourier transform infrared spectroscopy and the X-ray photoelectron spectrometer showed that hyperbranched polyethyleneimine was grafted to the surface of humin. Flame atomic absorption spectroscopy showed that the saturated Cd(II) adsorption capacity of the modified humin was increased to 11.975 mg/g, which is about 5 times than that of humin and is also higher than that of humic acid. The adsorption kinetics, adsorption isotherm, and thermodynamic properties of humic acid, humin, and modified humin were also studied. This study may provide a foundation for research utilizing natural resources to reduce heavy metal pollution in the environment.Keywords:humin;hyperbranched polyethyleneimine;modification;adsorption;Cd(II)
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 22
·5102
·
IF 3.057
Luyi Huang,Yoshikazu Ito,Takeshi Fujita,Xingbo Ge,Ling Zhang,Heping Zeng
Heavy metals pollution is one of the key problems of environment protection. Electrochemical methods, particularly anodic stripping voltammetry, have been proven a powerful tool for rapid detection of heavy metal ions. In the present work, a bismuth modified porous graphene (Bi@PG) electrode as an electrochemical sensor was adopted for the detection of heavy metal Cd2+in an aqueous solution. Combining excellent electronic properties in sensitivity, peak resolution, and high hydrogen over-potential of bi-continuous porous Bi with the large surface-area and high conductivity on PG, the Bi@PG electrode exhibited excellent sensing ability. The square wave anodic stripping voltammetry response showed a perfect liner range of 10−9–10−8M with a correlation coefficient of 0.9969. The limit of detection (LOD) and the limit of quantitation (LOQ) are calculated to be 0.1 and 0.34 nM with a sensitivity of 19.05 μA·nM−1, which is relatively excellent compared to other carbon-based electrodes. Meanwhile, the Bi@PG electrode showed tremendous potential in composite detection of multifold heavy metals (such as Pb2+and Cd2+) and wider linear range.Keywords:porous materials;graphene;bismuth;electrochemical deposition;square wave anodic stripping voltammetry
研究领域:
环境科学
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材料科学
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分析化学
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DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2017
·Vol. 409
·期 21
·4951-4958
·
IF 3.431
Zhu Yu-Feng,Wang Yong-Sheng,Zhou Bin,Yu Jun-Hui,Peng Li-Lan,Huang Yan-Qin,Li Xue-Jiao,Chen Si-Han,Tang Xian,Wang Xiao-Feng
We report a highly sensitive and selective strategy for Cd(II) assay using a singly labeled multifunctional probe consisting of a Cd(II)-specific aptamer (CAP), which acted as a recognition element for Cd(II) and a signal reporter. The presence of Cd(II) can induce the conformational switching of the CAP, accompanied by a change in fluorescence intensity. Thereby, a fluorescence strategy for Cd(II) assay was established. The proposed method has a detection limit of 2.15 nM, which is much lower than the detection limits reported in related literature. This strategy involves only an aptamer probe, and the use of such a G 4 -based quencher avoids the dual labeling of the CAP with fluorophore/quencher units. It is obviously more convenient and economical than the other aptamer-based biosensors for Cd(II) detection. The mechanism by which Cd(II) induces the CAP to change from a random coil sequence to a stem-loop structure was studied in a series of control experiments. This strategy would be helpful in the design of a sensitive analytical platform for various target assays in environmental and biomedical fields.
The presence of Cd 2+ leads to the conformational change of CAP from a random coil sequence to a stem-loop structure, resulting in a quenching in the fluorescence
研究领域:
分析化学
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环境科学
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生物技术
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生物传感器
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PubMed
高影响因子
Royal Society Open Science
·
2019
·Vol. 6
·期 4
·
IF 2.515
Zhongjun Xue,Na Liu,Hongxiang Hu,Jieying Huang,Yusef Kianpoor Kalkhajeh,Xiuyuan Wu,Nian Xu,Xiaofei Fu,Linchuan Zhan
Mesoporous ceramic functional nanomaterials (MCFN) is a self-assembled environmental adsorbent with a monolayer molecular which is widely used in the treatment of industrial wastewater and contaminated soil. This work aimed to study the relationship between the adsorption behaviour of Cd(II) by MCFN and contact time, initial concentration, MCFN dosage, pH, oscillation rate and temperature through a batch adsorption method. The adsorption kinetic and isotherm behaviours were well described by the pseudo-second-order and Langmuir models. The batch characterization technique revealed that MCFN had several oxygen-containing functional groups. Using Langmuir model, the maximum adsorption capacity of MCFN for Cd(II) was 97.09 mg g−1 at pH 6, 25°C, dosage of 0.2 g and contact time of 180 min. Thermodynamic study indicated that the present adsorption process was feasible, spontaneous and exothermic at the temperature range of 25–55°C. The results of this study provide an important enlightenment for Cd removal or preconcentration of porous ceramic nanomaterial adsorbents for environmental applications.
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
NANO
·
2020
·
IF 1.566
Yanhong Wang,Xiuli Wang,Cuihong Wu,Xiaomei Wang,Xu Zhang
A hybrid adsorbent with inverse opal (IO) structure was prepared for removing Cd(II) from aqueous solution. The functional polymeric chains were grafted from the pore wall of IO silica to prepare the porous hybrid material by surface-initiated atom-transfer radical polymerization. Furthermore, the amidation reaction was carried out to obtain diethylenetriamine-modified hybrid adsorbent (IO SiO 2 -g-PAA-DETA). Batch adsorption of removing Cd(II) onto IO SiO 2 -g-PAA-DETA was studied as the effect of solution pH, adsorbent doses, contact time, ionic concentration, and temperature. When the grafted amount was 73%, the maximum adsorption capacity was obtained. The optimum adsorbent dose and pH value for adsorbing Cd(II) were found to be 5 g/L and 0.5 g/L, respectively. The adsorption capacity was almost unaffected by Na + at low concentrations. The adsorption data was depicted by the corresponding models and the results displayed that adsorbing Cd(II) on IO SiO 2 -g-PAA-DETA followed the Freundlich and pseudo-first-order model. In addition, after six adsorption–desorption cycles, IO adsorbent could remain above 80% of the first adsorption ability while it was washed using 0.025 M EDTA.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Weixia Yang,Yu Qiang,Mengshuo Du,Youyu Cao,Yingying Wang,Xiaoshuo Zhang,Tianli Yue,Jihong Huang,Zhonghong Li
The outstanding performance efficiency for the removal of heavy metal ions in solution is governed by various factors: (a) sufficient contact probability between heavy metal ions and the adsorbent, (b) convenient diffusion/accessibility of heavy metal ions to the surface and the interior of the adsorbent, and (c) abundant binding sites for heavy metal ions on the adsorbent. We designed an efficient MnFe 2 O 4 @MIL-53 @UiO-66 @MnO 2 adsorbent for Pb(II) and Cd(II) removal. The adsorbents were fabricated by merging self-propelled nanomotors, exploiting hierarchical structure, and using a metal-organic framework (MOF) composite to simultaneously meet the three requirements. The sufficient contact probability between Pb(II)/Cd(II) and MnFe 2 O 4 @MIL-53 @UiO-66 @MnO 2 was achieved via the self-propelled movement of MnFe 2 O 4 @MIL-53 @UiO-66 @MnO 2 which was induced by the catalytic decomposition of H 2 O 2 by MnO 2 . The convenient diffusion/accessibility of Pb(II)/Cd(II) on the surface and interior of MnFe 2 O 4 @MIL-53 @UiO-66 @MnO 2 was achieved by exploiting the properties of the hierarchical structure of MnFe 2 O 4 @MIL-53 @UiO-66 @MnO 2 . Abundant binding sites (-COOH) on MIL-53 and UiO-66 composites were present for the binding of the Pb(II)/Cd(II) ions to the adsorbent. The adsorption capacities of the nanomotor adsorbent for Pb(II) and Cd(II) were 1018 and 440.8 mg g –1 at 25 °C, respectively. Additionally, the complex formed of MnFe 2 O 4 and MIL-53 endowed the adsorbent with easy-recyclable properties under the influence of an external magnet. The nanomotors exhibit satisfactory removal performances for Pb(II) and Cd(II).
研究领域:
环境科学
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材料科学
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化学工程
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PubMed
高影响因子
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