JOURNAL OF POROUS MATERIALS
·
2024
·
IF 2.5
Zhang Wenhui,Wu Xinbo,Wang Dazhi,Cai Weijie
As the frequency range of electronic devices gradually expands, exploring frequency insensitive electromagnetic wave adsorption (EWA) materials that can achieve effective absorption in all bands has aroused great interest. A series of Fe 1 − x S@C composite materials with three-dimensional conductive networks were successfully prepared in this work. In the preparation process, poly (aryl ether sulfone) with branched carboxylic (PAES-C) was selected as the skeleton and Fe 3+ ions were introduced via chemical adsorption. The main purpose of this work was to develop array porous composite materials with good EWA property. The work proposed a novel controllable method for preparing metal sulfides to explore the electromagnetic wave absorption. This routine was also developed to prepare other M x S@C composites (M = Fe, Cu, Mn). Compared to Mn x S@C and Cu x S@C composites, the RL min value of Fe 1 − x S@C-4 was − 40.6 dB at 13.52 GHz, and at a thickness of 1.5 mm the effective bandwidth reached 3.12 GHz. Furthermore, its effective absorption band covered Ku, X, and C radar bands at different thicknesses.
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International Journal of Environmental Research
·
2024
·Vol. 18
·期 6
·1-16
·
IF 2.6
Gao Yu-qiong,Ma Jia-xin,Rao Yan-yan,Chen Ju-xiang,Gao Nai-yun
Bezafibrate (BZF), an extensively used lipid-regulating agent, has been frequently detected in aqueous environments. In this work, we systematically investigated the Fe(II)/sulfite process for degrading BZF and its impact on disinfection byproducts (DBPs) during postchlorination. Degradation conditions were optimized by adjusting the pH, sulfite concentration, Fe(II), and BZF concentration. Under the conditions of pH = 4, [BZF] 0 = 5 μM, [Fe(II)] 0 = 25 μM, and [sulfite] 0 = 250 μM, the BZF removal efficiency reaches 97.9% in 15 min. Sulfate radicals (SO 4 ●– ) and singlet oxygen ( 1 O 2 ) are recognized as the main reactive agents, with Fe(IV) also contributing to the removal of BZF. Common anions (Cl − and HCO 3 − ) and humic acid generally impede the degradation process, except that trace amounts of Cl − can slightly accelerate BZF degradation. A total of ten products are recognized by ultra high performance liquid chromatography and quadrupole time-of-flight mass spectrometry, and four major degradation pathways are proposed: hydroxylation, cleavage of amino bonds, removal of fibrate chains, and dechlorination. Meanwhile, the toxicity assessment shows that the majority of products exhibit lower biological toxicity and less bioaccumulation potential than BZF itself. The Fe(II)/sulfite pretreatment alters the DBP formation potential, especially when Br − is present. The formation of trichloromethane (TCM) is diminished following pretreatment with the Fe(II)/sulfite process, whereas a noticeable increase in the formation of dichloroacetonitrile (DCAN) is found. Moreover, Fe(II)/sulfite pretreatment enhances the formation of brominated DBPs. Therefore, special consideration should be given to DBP formation when a Fe(II)/sulfite system is employed as a pretreatment for the removal of BZF in water. Graphical abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chen Wang,Xiaohui Wu,Mingjie Huang,Tao Zhou,Juan Mao,Xiangling Zhang
Treatment of Cr(VI)-contaminated wastewaters by conventional reduction methods has been intensively challenged by alkaline environments. In this study, a novel copper-iron oxide composite (Cit@CuFeO) enriched with oxygen vacancies (OVs) was developed by ball milling with citric acid ligand (Cit). The material demonstrated efficient Cr(VI) removal within a broad pH range (6.0–12.0). Intriguingly, simultaneous and nearly complete in-situ immobilization of Cr(III) occurred, instead of precipitated in strong alkaline circumstances. Characterizations of the Cit@CuFeO revealed that ball milling of Cit could introduce abundant OVs into the oxide structure, serving as pivotal active sites linearly correlated with Cr(VI) capture and removal. These generated OVs could also boost electron conduction in Cit@CuFeO and cause a positive shift in the zeta potential , thereby enabling the adsorption of negative CrO 4 2- at high pH. Furthermore, DFT calculation verified that the surface-attached Cit would significantly decrease the adsorption energy of Cr(VI) at OVs sites, competitively excluding the occupancy of common inorganic anions especially CO 3 2– and thus favoring the Cr(III) immobilization under alkaline conditions. This study has provided a green functional material for the one-step remediation of alkaline Cr(VI) wastewaters without the need for acidification.
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Sustainability
·
2024
·Vol. 16
·期 7
·3009
·
IF 3.3
Jiahui Wang,Zhen Xi,Bo Niu,Ruitong Gao,Zhenming Xu
Deep and efficient debromination is a critical step in achieving environmentally friendly recycling and ensuring the sustainability of waste-printed circuit boards (WPCBs) because of their high toxicity and carcinogenicity. To this end, this study used a copper–iron (Cu/Fe) bimetal as a debromination agent to remove bromides from WPCBs using in situ catalytic pyrolysis technology. The results show that the maximum debromination efficiency was 97.14% under the following conditions: a Cu mole ratio of 0.20 (Cu/Fe-0.20), a Cu/Fe-0.20 dosage of 0.4, a pyrolysis temperature of 600 °C, and a retention time of 10 min. The main bromine species in pyrolysis oil and gas were bromophenol, bromomethane, HBr, and Br2. The conversion of bromine species and the debromination of the Cu/Fe-0.20 bimetal were analyzed in real time using a thermogravimetry-coupled Fourier transform infrared and mass spectrometer (TG-FTIR-MS). Using the Cu/Fe bimetal synergistic effect, we determined that the debromination mechanism could be used for bromide conversion and fixing. The Cu in the Cu/Fe-0.20 transformed the organic Br (bromophenol and bromomethane) into inorganic Br (HBr and Br2) by providing empty orbitals for lone pairs of electrons. Then, the generated HBr and Br2reacted with Fe in the Cu/Fe-0.20 and were fixed in pyrolysis residue. This study provides theoretical support and a practical method for WPCB deep debromination and recycling.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Yi Gu,Yang Jiao,Ya Ruan,Jing Yang,Yaling Yang
Herein, a nanocomposite of Cu,Ce-containing phosphotungstates (Cu,Ce-PTs) with outstanding laccase-like activity was fabricated via a one-pot microwave-assisted hydrothermal method. Notably, it was discovered that both Fe 3+ and Cr 6+ could significantly enhance the electron transfer rates of Ce 3+ and Ce 4+ , along with generous Cu 2+ with high catalytic activity, thereby promoting the laccase-like activity of Cu,Ce-PTs. The proposed system can be used for the detection of Fe 3+ and Cr 6+ in a range of 0.667–333.33 μg/mL and 0.033–33.33 μg/mL with a low detection limit of 0.135 μg/mL and 0.0288 μg/mL, respectively. The proposed assay exhibits excellent reusability and selectivity and can be used in traditional Chinese medicine samples analysis.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Shiyu Pan,Deling Yuan,Jinhao Li,Zhibin Wang,Qingrui Zhang,Shoufeng Tang
The traditional Fenton application is limited by the disproportionation of hydrogen peroxide (H 2 O 2 ) and the tardy reduction of Fe(III). To conquer these issues, we construct an enhanced Fenton-like process using a composite of citric acid-carboxylated microcrystalline cellulose complexing with Fe(III) (CA-Fe(III)@MCC) to activate sodium perborate (SPB), which can effectively eliminate antibiotic sulfamethoxazole (SMX, 89.2%, 0.035 min -1 ). The CA-Fe(III)@MCC composite significantly enhances the circulation of Fe(III)/Fe(II), leading to the generation of hydroxyl radicals and perboric radicals with excellent structural stability and minimal Fe leaching during CA-Fe(III)@MCC/SPB process. Systematic investigations reveal that the introduced carboxyl groups not only anchor Fe(III) to prevent its deactivation and leaching, but also regulate the coordination environment and serve as electron shuttles, driving the formation of reactive species and reduction of Fe(III). This process presents a novel, environmentally friendly, and sustainable strategy for utilizing natural cellulose and its industrial biomass product in advanced oxidation processes .
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CHROMATOGRAPHIA
·
2024
·
IF 1.2
Shao Xiaozhen,Xu Guangfu,Chen Jiaquan,Miao Pandeng,Yang Ke,Du Yingxiang,Yu Tao
Metal–organic frameworks (MOFs) have a wide range of applications in separation and analytical sciences due to their unique structures. MIL-100(Fe) was immobilized on the inner wall of the capillary column based on the immobilized cysteine (Cys)-triggered in situ growth (ICISG) strategy. By applying this column to capillary electrophoresis, a novel enantioselective separation system based on MIL-100(Fe) nanomaterial was established. By utilizing lactobionic acid (LA) as the chiral selector and optimizing the experimental conditions such as buffer pH, LA concentration and the methanol addition ratio, the CEC system demonstrated a significantly enhanced enantioseparation ability for six basic drugs. The modified capillary column was characterized by scanning electron microscope (SEM), energy-dispersive X-ray spectroscope (EDS) and X-ray diffractometer. The experimental results showed that MIL-100(Fe) was successfully grown on the inner wall of the capillary column. In the present study, the repeatability of the coated column was investigated and the relative standard deviations (RSDs) of the resolution and the migration time for intra-day, inter-day and inter-column were within 8%, proving the good repeatability of the coated column.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 15
·6745-6757
·
IF 2.7
Yingzi Lin,Ningning Sun,Qingyu Zhang,Lei Chen,Shengbo Sun,Hong Yang,Jing Chen,Qixuan Weng,Shuang Xue
To overcome the limitations of the Fe(II)-activated percarbonate process for ACT removal, this study introduced cysteine as a complexing agent into the Fe(II)/SPC system and enhanced the degradation efficiency of ACT. Investigations were conducted on the effects of pH, temperature, common anions (Cl−, HCO3− and NO3−) in the water column, and humic acid (HA) on the degrading efficiency of the Cys/Fe(II)/SPC system. The results showed that under ideal conditions, 99.9% removal of ACT at 0.05 mM could be achieved. Alkaline environments inhibited ACT degradation, whereas acidic environments promoted it. Electron paramagnetic resonance (EPR) successfully detected ˙OH and O2˙−, but no 1O2 radical signal was detected. Further research was carried out to determine how much ˙OH and O2˙− contributed to the oxidation process. The results showed that both ˙OH and O2˙− contributed to the degradation of the ACT, with ˙OH's contribution being particularly significant. Mass spectrometry analysis was used to determine the structure of the oxidation products. Vulnerable sites in ACT were predicted using density functional theory. Using LC-MS/MS analysis, seven intermediates of the Cys/Fe(II)/SPC degradation of ACT were individually identified. The results showed that the acetylamino group on ACT and the C–N bond on the benzene ring are susceptible to attack by ˙OH. The T.E.S.T. toxicity prediction model was used to predict the toxicity of ACT and its intermediates. The results showed a trend towards reduced acute toxicity and overall developmental toxicity.
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CRYSTENGCOMM
·
2025
·
IF 2.6
Han Fang,Jia-Peng Han,Bo Zhang,Deng-Bo Liu,Xing-Wang Li,Jing-Yu Li,Yutong He,Mei-Hui Yu
The heavy metal ion pollution has become one of the most serious environmental problems, which promotes the continuous exploration of new materials and methods to achieve efficient detection of heavy metal ions. Luminescent metal-organic frameworks (LMOFs) featuring the designable and functional structures and tunable luminescence properties exhibit excellent potential for the recognition and detection of heavy metal ions. Herein, a Cd(II)-based luminescence MOF {[Cd2(2F-bpdc)2(tib)]}n (NKM-103) (tib=1,3,5-tris(1-imidazolyl)benzene, 2F-H2bpdc= 3,3'-difluorobiphenyl-4,4'-dicarboxylic acid) has been designed and synthesized successfully. Derived from the characteristic of ligand with conjugated units, NKM-103 shows well fluorescence emission performance and potential as a sensor for detecting both Fe(III) cations and Cr(VI) anions (Cr2O72- and CrO42-) through turn-off effect. Moreover, NKM-103 for all three kinds of ions shows low detection limit and high selectivity.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jin Du,Hebin Liang,Yubin Zou,Bing Li,Xiao-yan Li,Lin Lin
The electroreduction of carbon dioxide (CO2) to high-value organic chemicals by the microbial electrosynthesis (MES) system relies heavily on the electrochemical properties of the electrode materials. In this work, CO2 reduction for acetate production was greatly boosted by decorating the carbon felt cathode using the Fe–Mn bimetallic oxides, using an enriched anaerobic mixed culture dominated by the homoacetogen Acetobacterium wieringae. In comparison with the unmodified carbon felt as the cathode in the MES reactor, modification with MnFe2O4 increased the acetate production rate from 28 to 78 g/(m2·d), higher than those with MnO at 59 g/(m2·d) and Fe2O3 at 62 g/(m2·d), and the relative abundance of A. wieringae increased dramatically from 51 to 87% in the biofilm. This was probably due to the mediated electron uptake via the redox cycles of Mn(III)/(II) and Fe(III)/(II), improved specific surface area, and enhanced hydrophilicity of the cathode, benefiting from the synergistic effect of Fe and Mn ions. Overall, this study provides a facile and promising electrode modification strategy for MES with Fe–Mn bimetallic oxides for efficient CO2 conversion and acetate production, bringing the world closer to achieving carbon neutrality.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zunchang Gao,Yanqing Wei,Xin Tian,Yang Liu,Xin Lan,Dawei Zhang,Shuaiyuan Han,Pengfei Huo
The synthesis of novel Ce/Fe bimetallic metal–organic frameworks (Ce/FcDA/FA-MOFs) via an innovative hydrothermal method is reported. This method utilizes Ce as the central metal and 1,1′-ferrocene dicarboxylic acid (FcDA) and formic acid (FA) as ligands. Optimization of hydrothermal time, feed ratio, and the addition of FA yielded Ce/FcDA/FA-MOFs with ideal ortho -dodecahedral hierarchical configurations. Comprehensive characterization via FT-IR, XRD, SEM, EDS, XPS, and N 2 adsorption/desorption analyses elucidated the influence of FA on morphology and chemical structure. Phosphate adsorption tests on Ce/FcDA/FA-MOFs revealed sustained strong selectivity and adsorption capacity, even in the presence of coexisting anions and variations in pH. Kinetic, thermodynamic, and isothermal simulations indicated spontaneous, efficient, and heat-absorbing phosphate adsorption properties on Ce/FcDA/FA-MOFs. Fitting parameters from the Langmuir adsorption model demonstrated a maximum adsorption capacity of up to 530.25 mg g −1 , attributed to physical/chemical adsorption during the reaction. Furthermore, investigation into the adsorption mechanism of Ce/FcDA/FA-MOFs on phosphate through FT-IR, XRD, and XPS analyses of the adsorbed samples revealed a complex process involving the electrostatic mutual attraction of outer-sphere entities and ligand exchange in the inner-sphere. This study advances our understanding of Ce/FcDA/FA-MOFs as effective adsorbents for phosphate and contributes to the development of environmentally sustainable materials with potential applications in water treatment.
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RSC Advances
·
2024
·Vol. 14
·期 7
·4861-4870
·
IF 3.9
Yibo Zhao,Yueyang Li,Lu Chang,Wenjing He,Keling Liu,Minjie Cui,Shengnan Wang,Yujia Zhao,Xinyu Tan
Bimetal doped Cu–Fe-zeolitic imidazole framework-8 (ZIF-8)/graphitic carbon nitride (GCN) (Cu–Fe-ZIF-8/GCN) nanocomposites were prepared via one-pot and ion-exchange methods. The main influencing factors, such as adsorbent concentration, TC concentration, initial pH, and coexisting ions, were evaluated in detail. Due to the suitable pore structures and the presence of multiple interactions on the surface, the nanocomposite showed a high adsorption capacity up to 932 mg g−1 for tetracycline hydrochloride (TC), outperforming ZIF-8 by 4.8 times. The adsorption kinetics and adsorption isotherm were depicted in good detail using pseudo-second-order kinetic and Langmuir models, respectively. Thermodynamic calculation revealed that the adsorption of the nanocomposite under experimental conditions was a spontaneous heat absorption process, and was primarily driven by chemisorption. After four cycles of use, the nanocomposite retained 87.2% of its initial adsorption capacity, confirming its high reusability and broad application prospects in removing tetracycline-type pollutants from wastewater.
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