ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 30
·期 2
·4123-4136
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IF 5.19
Li Jiacheng,Tian Tian,Jia Yannan,Xu Nannan,Yang Shujun,Zhang Chenyue,Gao Shiwei,Shen Wei,Wang Zheng
Herein, an iron-doped ZIF-8-loaded multi-walled carbon nanotube (FZM) was synthesized and its adsorption performance on tetracycline (TC) was investigated. The experimental conditions (solution pH, temperature, adsorbent dose) were optimized by Box–Behnken design (BBD) in response surface methodology (RSM). The results show that the adsorption effect of TC by FZM is optimal under the conditions of temperature = 298 K, pH = 6, and contact time = 360 min. The adsorption processes of TC by FZM follow the pseudo-second-order (PSO) kinetic and Freundlich isotherm models, indicating that chemisorption is the dominant factor and the adsorption reaction is multi-layer, with a theoretical maximum saturation capacity of 1111.11 mg/g at 298 K. The adsorption thermodynamic results indicate that the adsorption of TC by FZM is a spontaneous and endothermic process. The mechanism of TC adsorption by FZM possibly occurs through hydrogen bonding, surface complexation, π–π interaction, and electrostatic interaction. From the statistical results, the optimal adsorption capacity of TC by FZM is 599.78 mg/g at a pH of 7.1, a temperature of 312.5 K, and an adsorbent dose of 64.43 mg/L, with a deviation of 1.73% from the actual value. Furthermore, regeneration experiments demonstrate that FZM has excellent reusability with a 15% loss of adsorption capacity after four cycles. This study provides some insights to study the adsorption behavior of TC by MOFs and the optimization of the adsorption experimental conditions, and also shows the potential of FZM for TC removal.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Kai Wang,Chunqing Niu,Xin Zhang,Nuo Liu,Zhengxin Luo,Chunhong Zhu,Jian Shi
A mixed mono−/multidentate ligand strategy engineered defective MIL-100(Fe). • Coordinatively unsaturated Fe O sites promoted rapid heavy-metal adsorption. • Defect engineering integrated Fe O exposure and amino functionalization. • Synergistic Fe–O/NH₂/COO − sites enhanced adsorption kinetics and affinity. • A flexible MOF membrane achieved efficient and recyclable heavy-metal removal. To address Pb(II) and Cd(II)-dominated heavy-metal contamination in water, a series of amino-bearing, defect-regulated Fe-based metal-organic frameworks (MOFs) were constructed using ligand engineering. In the synthetic design, the tritopic linker 1,3,5-benzenetricarboxylic acid (H₃BTC) was coupled with the monotopic modulator p-aminobenzoic acid (PABA), enabling the simultaneous generation of coordinatively unsaturated Fe O centers and exposed -NH₂ functionalities within the framework. This dual functionalization substantially strengthened the affinity of the adsorbent for divalent heavy-metal ions. Among the obtained samples, 6 mg Fe(BTC)₈(PABA)₂, corresponding to an H₃BTC/PABA feed ratio of 8:2, delivered the best adsorption performance under the conditions of 25 °C, pH 5, and an initial concentration of 150 mg/L, with maximum uptake values of 732.03 mg/g for Pb(II) and 654.05 mg/g for Cd(II), and equilibrium was achieved within 15 min. Kinetic and equilibrium analyses followed the pseudo-second-order model and Langmuir isotherm, respectively, indicating that monolayer chemisorption dominates the capture process. To improve the handling, recovery, and reusability of Fe(BTC)₈(PABA)₂ particles, they were incorporated into a polyacrylonitrile (PAN) nanofibrous matrix via electrospinning to obtain a Fe(BTC)₈(PABA)₂@PAN membrane. The membrane retained good structural stability and pronounced selectivity, particularly for Pb(II), in both binary-ion media and multi-cationic aqueous systems. After five adsorption-desorption cycles, more than 83% of the initial adsorption capacity was retained. DFT (Density functional theory) calculations further supported the experimental observations, showing that the adsorption originated from cooperative coordination among unsaturated Fe-O-M sites, carboxyl oxygen atoms, and amino nitrogen atoms. Therefore this study provides a defect- and functionality-coupled strategy for developing MOF-based adsorbents with both rapid uptake and high capacity for heavy-metal remediation. Download: Download high-res image (331KB) Download: Download full-size image
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Qi Chen,Zefeng Yang,Yueling Chen,Jionghua Wu,Jimmy C. Yu,Ling Wu
The fabrication of single atoms on MIL-125(Ti) for photocatalytic ammonia synthesis. • SAs modulate the local electronic structure for charge mobility and separated active site. • The favorable N 2 activation and protons supply optimizes the reduction kinetics. • Magnetic field-induced spin flipping to charge utilization further boost the activity. Photocatalytic nitrogen fixation is an attractive alternative to the energy-intensive traditional ammonia synthesis. However, the major challenge is that most photocatalysts are limited by their low charge mobility, insufficient molecules activation and sluggish reaction kinetics. Herein, we integrated single atoms (Co, Fe, Ni) on MIL-125(Ti) functionalized with sulfhydryl (MIL-125(SH) 2 , MTS) to afford Co-MTS, Fe-MTS and Ni-MTS for photocatalytic nitrogen reduction. Through uniformly dispersed SAs (single atoms) coordinated with O and S atom, such intimate interaction and charge redistribution can efficiently regulate the unsaturated Ti sites for N 2 adsorption and activation. Moreover, the introduced SAs species also serve as separated active center for water oxidation to promote H 2 O adsorption and protons release, kinetically optimizing protons supply and energy barrier of rate rate-determining step for N 2 hydrogeneration. Benefited from the spatially separated metal node-SAs dual sites and favorable reaction energy barrier, the optimized Ni-MTS sample shows an ammonia yield rate of 72.6 μmol·g −1 ·h −1 with an apparent quantum efficiency of 0.49% at 400 nm. This can be further enhanced by magnetic field-induced spin flipping contributed to charge utilization. This work would inspire the development of other high-efficiency single atom/MOFs that combining molecular activation and protons supply for photocatalysis.
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BIOMASS & BIOENERGY
·
2026
·
IF 7
Yingying Zhu,Zhong Wang,Jinze Li,Yumeng Ren,Chao Zeng,Geng Chen
Mg-Zn-Fe LDH was anchored on phosphate-modified reed straw biochar. • Mg 1 Zn 1 Fe-LDH@PBC reached a surface area of 394.466 m 2 g −1 . • The adsorbent efficiently removed RhB, MO, and OTC from water. • Maximum RhB adsorption capacity reached 659.2 mg g −1 . • Removal efficiency remained around 70% after five cycles. Sustainable conversion of waste biomass into high-performance adsorbents provides an effective route for organic wastewater remediation. In this study, phosphate-modified reed straw biochar-supported layered double hydroxide composites (LDH@PBC) were synthesized via a facile co-precipitation method. Binary and ternary LDHs containing Mg 2+ , Zn 2+ , and Fe 3+ were constructed on the biochar matrix, and their adsorption performance toward rhodamine B (RhB), methyl orange (MO), and oxytetracycline (OTC) was systematically evaluated. The optimized Mg 1 Zn 1 Fe-LDH@PBC exhibited a well-developed porous structure, abundant surface functional groups, and the highest specific surface area of 394.466 m 2 g −1 . Owing to the synergistic effects of phosphate-modified biochar and Mg-Zn-Fe LDH nanosheets, the composite maintained stable adsorption efficiency over a broad pH range. The optimized Mg 1 Zn 1 Fe-LDH@PBC achieved a maximum experimental RhB adsorption capacity of 659.2 mg g −1 under the optimized dosage condition. In contrast, Langmuir isotherm fitting gave theoretical maximum monolayer adsorption capacities of 944.898, 696.552, and 303.146 mg g −1 for RhB, MO, and OTC at 298 K, respectively. Kinetic and isotherm analyses suggested that the adsorption process may be associated with multiple interactions, including electrostatic attraction, ion exchange, hydrogen bonding, π–π interactions, and possible surface complexation. In addition, the removal efficiency remained around 70% after four adsorption–desorption cycles, indicating favorable reusability. This work highlights a promising biomass-derived LDH/biochar adsorbent for efficient and sustainable removal of multiple organic pollutants from water.
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BIORESOURCE TECHNOLOGY
·
2026
·
IF 8.2
Fangfang Ye,Xiaoying Jin,Jiajiang Lin,Zuliang Chen
A nitrogen-doped and CaO-activated pinewood biochar ( N -aPBC) was synthesized. • Closed-loop recycling strategy enables electroplating wastewater treatment. • N -aPBC achieves high Fe 3 ⁺/Cu2⁺ adsorption capacities of 287.40/61.88 mg g⁻1. • N/O functionalities and defects promote Fe 3 ⁺/Cu2⁺ uptake via surface interactions. • Spent adsorbent-derived Fe-Cu-NaB removes 93.64% CIP from swine effluent. The efficient removal and resource recovery of high-concentration heavy metals like Fe 3 ⁺ and Cu 2 ⁺ from electroplating wastewater remains a critical challenge. Herein, a sustainable closed-loop “adsorption-transformation-upcycling” strategy was proposed. Initially, a nitrogen-doped and CaO-activated pinewood biochar ( N -aPBC) was synthesized via synergistic modification. Systematic characterization revealed that N -aPBC features a high specific surface area (188.79 m 2 g⁻ 1 ), a hierarchical porous architecture, and abundant nitrogen-containing functionalities. Adsorption experiments demonstrated superior performance for Fe 3 ⁺ and Cu 2 ⁺, yielding maximum capacities of 287.40 and 61.88 mg g⁻ 1 , respectively. Mechanistic investigations indicated that the adsorption followed the pseudo-second-order kinetic model and Langmuir isotherm, suggesting monolayer chemisorption. The primary removal mechanisms involved surface complexation via N/O-functional groups, coupled with electrostatic attraction and ion exchange. N species and defects tuned surface polarity and electronic structure. Subsequently, the spent adsorbent was calcined to produce a functional material (Fe-Cu-NaB). Electrochemical analyses confirmed that Fe-Cu-NaB exhibited lower charge transfer resistance and enhanced electrocatalytic activity. Notably, Fe-Cu-NaB enhanced the oxidative degradation capacity, achieving high removal rates of 93.64% for ciprofloxacin (CIP) and 65.88% for total organic carbon (TOC) in swine wastewater. This work provides a high-performance adsorbent for heavy metal remediation and establishes a viable pathway for the high-value reutilization of spent adsorbents as efficient catalytic materials. Download: Download high-res image (142KB) Download: Download full-size image
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ACS Applied Nano Materials
·
2026
·
IF 5.8
Yue Qian,Xiaopeng Luo,Ying Mao,Haiyang Gu,Lan Zhang,Xiaomin Zhang,Xuejing Shen,Rui Zhu,Zhanjun Wu
Transition metal-modified carbon composites have emerged as promising candidates for electromagnetic wave (EMW) absorption due to their tunable microstructure and tailorable electromagnetic properties. However, the influence of metal species configuration on dielectric loss at the atomic scale remains less understood. In this work, we fabricated three types of M-NC absorbers (M = Fe, Co, and Ni; NC = N-doped carbon) using a unified method that includes templating, pyrolysis, and acid etching. This approach produced samples with similar porous structures, which helped minimize structural differences and isolate the effect of the metal species. Among them, Ni-NC achieved a minimum reflection loss of −39.7 dB at 13.3 GHz with a matching thickness of only 2.0 mm, much better than Fe-NC (−22.5 dB) and Co-NC (−27.3 dB). This superior performance is attributed to the specific metal-N bonding structure, which governs both the interfacial polarization and the electronic structure. Meanwhile, the 3D carbon porous framework promotes impedance matching and extends the EMW propagation path through multiple scattering, collectively enabling superior absorption performance. Radar cross section simulation results confirm the effective EMW attenuation of these composites, particularly Ni-NC, highlighting their potential suitability for stealth applications. This work provides fundamental insights for the rational design of high-performance, lightweight EMW absorbers through precise chemical structure engineering.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Qinbo Cao,Xingguo Huang,Li Guo,Haohua Qin,Lingpan Du,Menglai Wang,Dianwen Liu,Peilun Shen
PS/Fe 2+ /Cu 2+ reagents inhibited PbS flotation with 30 s of reaction. • Cu 2+ raised the SO 4 • − yield in the PS/Fe 2+ /Cu 2+ solution. • SO 4 • − oxidized the PbS surface, producing PbO and SO 4 2− . • Cu 2+ raised the Fe 3+ concentration in solution and improved the Fe 2+ /Fe 3+ cycle. Galena (PbS) depression in PbS–chalcopyrite (CuFeS 2 ) mixture via SO 4 • − radicals generated from persulfate (PS)/Fe 2+ typically requires a high PS concentration (0.15 mol/L) and a prolonged reaction time (10 min). This study employed a combined Cu 2+ /Fe 2+ catalyst to enhance SO 4 • − generation at a lower PS concentration. Flotation tests were conducted to determine optimal PbS treatment conditions using the PS/Fe 2+ /Cu 2+ system. The results showed that effective PbS depression was achieved with a PS concentration of 6.5 × 10 −3 mol/L and a reaction time of only 30 s. The synergistic role of Cu 2+ was investigated using surface analyses, including contact angle tests, XPS, Raman and UV-visible spectra. Contact angle measurements revealed that after 30 s of treatment, the PbS surface angle decreased to 38.2°, whereas the CuFeS 2 surface remained hydrophobic. Oxidation products, including PbO and SO 4 2− , formed on the PbS surface. SO 4 • − and •OH both existed in the system to react with the PbS surface, and SO 4 • − was the major radical species as indicated by the radical quenching tests. UV–visible spectrum results implied that Cu 2+ increased the equilibrium Fe 3+ concentration, thereby facilitating the Fe 2+ /Fe 3+ cycle and sustaining PS activation. The rapid oxidation capacity of the PS/Fe 2+ /Cu 2+ system demonstrates strong potential for industrial application. Download: Download high-res image (202KB) Download: Download full-size image
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 7
·462
·
IF 5.4
Zhao Yunfei,Fang Jiale,Zhang Baofeng,Wang Yan,Wu Lianbin,Pan Qinghua,Zhou Ziyun,Jiang Kezhi
A superhydrophobic magnetic nanomaterial, Fe 3 O 4 @C16&TMS, was synthesized by hexadecylating the surface of the Fe₃O₄ nanoparticles and sealing the residual hydroxyl groups. The nanomaterial exhibits a high specific surface area of 45.3 m²/g, and superhydrophobicity with a water contact angle of 158.11°. The high specific surface area offers numerous adsorption sites, and the superhydrophobic characteristics of the synthesized nanomaterial can selectively enrich non-polar volatile methylsiloxanes (VMSs) through hydrophobic interactions, thereby significantly enhancing extraction efficiency and reducing matrix interference. Notably, no significant decline in performance was observed after 6 consecutive reuse cycles. Based on this material, a rapid and simple method for the determination of VMSs in water was developed using magnetic solid-phase extraction (MSPE) coupled with gas chromatography-mass spectrometry (GC-MS) analysis. The method enabled effective extraction of VMSs from water within 20 min, achieving recoveries ranging from 70.4% to 117.0%. The method limit of quantitation (LOQ) was 0.004 ng/mL, with intra-day precision (RSD) ranging from 0.9% to 3.9%. Analysis of real water samples revealed contamination in all 16 selected water bodies, with five specific VMSs species detected at concentrations ranging from 0.01 to 0.52 ng/mL. In summary, the proposed method enabled rapid and simple determination of VMSs in water samples, demonstrating significant potential for environmental analysis applications. Graphical abstract The alternative text for this image may have been generated using AI.
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PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2026
·Vol. 28
·期 5
·135
·
IF 3.5
Guo Hao,Zhang Baowen,Bai Ziwei,Miao Rusen,Zhang Kaiyue,Wang Meng,Tian Fei
A rapid, sensitive, and convenient surface-enhanced Raman spectroscopy (SERS) substrate was developed using Fe₃O₄/C as the magnetic core and SiO₂-SH as the shell for the detection of aflatoxin B1 (AFB1). Ultra-small Fe₃O₄/C nanoparticles (NPs) with an average size of 6.30 ± 0.68 nm and excellent magnetic responsiveness were synthesized via a one-pot hydrothermal method, followed by the deposition of a uniform SiO₂ shell, followed by thiol-group functionalization to yield Fe₃O₄/C/SiO₂-SH. The magnetic core enables instantaneous separation of the substrate from solution after AFB1 adsorption, eliminating the need for centrifugation or filtration. When employed as a SERS substrate, significant enhancement of the characteristic Raman peak at 1482 cm⁻ 1 was observed across AFB1 concentrations of 0.1–10 μg/mL. Notably, the peak intensity at 10 μg/mL exceeded that of solid AFB1 powder. Comprehensive characterization (TEM, XRD, FTIR, XPS, and vibrating sample magnetometry) confirmed the core–shell structure, high crystallinity, and strong magnetic properties. The prepared Fe₃O₄/C/SiO₂-SH nanocomposite offers a low-cost, easily recyclable, and noble-metal-free platform, demonstrating strong potential for trace AFB1 monitoring in herbal medicines and food products.
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Desalination and Water Treatment
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2026
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IF 3.4
Hao Li,Minru Su,Chen Shi,Rouyi Wang,Anqi Xu,Xiaolan Shen
High catalytic activity and long-term stability of particle electrodes are key to three-dimensional electro-activated peroxydisulfate (3D-E-PDS). This study developed the Fe-based reduced graphene oxide (Fe/rGO) hydrogel particle electrodes prepared using a low-temperature hydrothermal method, demonstrating a 9.77-fold increase in tetracycline hydrochloride (TCH) degradation rate compared with conventional two-dimensional (2D) E-PDS system. The structural properties and catalytic activities of the Fe/rGO hydrogel particles clearly depended on the iron precursor, with the Fe 3 + -derived hydrogel exhibiting the highest catalytic activity. After systematically optimizing the operational parameters (PDS concentration, current density, particle dosage, initial solution pH, TCH concentration, and agitation rate), the 3D-E-PDS system achieved a TCH degradation efficiency of 94.44% and total organic carbon removal efficiency of 46.62% within 2 h. In water matrices, Cl − promoted TCH degradation, whereas SO 4 2− , PO 4 3− , and especially CO 3 2− inhibited the degradation. Radical quenching experiments identified SO 4 · − , ·OH, 1 O 2 , and ·O 2 − as the primary reactive species. After six cycles, the 3D-E-PDS maintained a TCH degradation efficiency of 82.56%, with a degradation rate 2.56 times higher than that of the 2D-E-PDS system, validating its stability and reusability. Overall, this study establishes a one-step hydrothermal synthesis protocol for Fe/rGO hydrogel particle and demonstrates the efficacy of 3D-E-PDS in TCH degradation.
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Inorganic Chemistry Frontiers
·
2026
·
IF 6.2
Lei Huang,Xue Zou,Ensi Li,Dongmei Wang,Imran Shakir,Xuping Sun,Zhengjun Gong
Advanced oxidation process of inorganic peroxide activation is regarded as an effective and reliable method for antibiotics removal. In this paper, we report on the development of Fe-O-coordinated porous honeycomb carbon nanofiber (Fe-O-HCNF) as a high-performance catalyst for rapid degradation of tetracycline (TC) by activation of peroxymonosulfate (PMS). The effects of Fe-O-HCNF dose, PMS concentration, and initial pH were systematically investigated. The results showed that such Fe-O-HCNF achieved a high TC degradation efficiency of 84.7% within 15 minutes. Notably, complete TC degradation (100%) was achieved within 8 minutes at an low catalyst dosage of 0.08 g/L. The Fe-O-HCNF possessing exceptionally high specific surface area of 691.501 m²g-1 provides abundant adsorption and activation sites for the degradation reaction, while the introduction of iron is essential for the continuous activation of PMS. The electron paramagnetic resonance and quenching experiments results indicated that, in addition to sulfate (•SO4−) and hydroxyl (•OH), both singlet oxygen (1O2) and superoxide (•O2−) contribute to the degradation of TC. More interestingly, the Fe-O-HCNF /PMS system showed almost no interference in the real water matrices and various initial pH conditions. Importantly, no metal ion leaching was detected in the treated effluent, indicating minimal secondary environmental contamination risks from heavy metal leaching.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Wenjuan Luo,Xiunan Cai,Zhongqiu Luo,Chaochao Lai,Qian Long,Xue Yang,Limin Ning,Pingyan Wang,Xiang Zhang,Xin Fu,Xintao Zhou
Developing efficient and cost-effective processes for removing highly toxic As(III) from water is critical for environmental restoration. Herein, an amorphous Fe–Mn composite (A-CSM) rich in oxygen vacancies was synthesized via a one-pot process. Acid etching of a pretreated copper slag product created the chemical conditions that simultaneously enabled the in situ anchoring of MnO x clusters and induced a crystalline-to-amorphous transformation. The resulting strong Fe–O–Mn interfacial coupling drives interfacial electron redistribution, which upshifts the d-band center and thereby endows the material with unique capabilities for O 2 activation and arsenic adsorption. Leveraging abundant oxygen vacancies within the amorphous structure, A-CSM efficiently activates O 2 into •O 2 − radicals to drive spontaneous As(III) oxidation to As(V), while exposed unsaturated sites in amorphous FeO x domains provide rapid adsorption sites for As(V). Consequently, A‑CSM exhibits a broad pH range (3–9), rapid adsorption kinetics (achieving complete removal of 5 mg L −1 As(III) within 30 min, which is 24.7 times faster than its crystalline counterpart, CSM), the q max calculated by Langmuir model is 84 mg g −1 , and good reusability over five consecutive cycles. Mechanistic studies confirmed that the synergy between the acid etching‑induced amorphous structure and oxygen vacancies significantly reduces the O 2 adsorption energy while it upshifts the d‑band center. This effect lowers the energy barrier for As(III) oxidation/adsorption by approximately 48.9%, and substantially enhances •O 2 − generation. Adsorption primarily involves complexation, electrostatic interactions, and hydrogen bonding, which is consistent with a heterogeneous multilayer process as described by the Freundlich isotherm.
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危险品化学品经营许可证（带存储）