CHEMICAL ENGINEERING JOURNAL
·
2018
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IF 6.735
Yuezhu Wang,Hanmin Zhang,Baikun Li,Mingchuan Yu,Ran Zhao,Xiaotong Xu,Lu Cai
Novel γ-FeOOH graphene polyacrylamide carbonized aerogel (γ-FeOOH GPCA) was used as the cathode in neutral electro-Fenton (EF) process to achieve degradation and mineralization of sulfamethoxazole (SMX). γ-FeOOH GPCA cathode was fabricated by a multiple-phase carbonization method, leading to a good conductivity (26.37 Sm −1 with 7.5 mg mL −1 GO) and high electrochemically active surface area (EASA). An in situ synthesis method of γ-FeOOH was accomplished to distribute the catalyst uniformly and firmly into the carbonized aerogel framework. Two electron reduction could take place at the cathode, H 2 O 2 and Fe 2+ can be generated at GPCA cathode efficiently. A 5-batch comparative assessment between GPCA-EF and CF-EF process exhibited the distinguished catalytic stability of GPCA cathode with a total organic carbon (TOC) removal efficiency of 89.8 ± 0.8%, 89.1 ± 0.9% and 84.7 ± 1.1% at the last 3 batches, respectively, versus 61.2 ± 1.2, 60.9 ± 1.1 and 59.4 ± 0.9% by CF cathode. This carbonized aerogel cathode demonstrated a great potential for the EF process to remove organic pollutants in water at neutral pH.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Irfan Ijaz,Aysha Bukhari,Ezaz Gilani,Ammara Nazir,Hina Zain,Attia Shaheen,Mohammed Rafi Shaik,Mujeeb Khan,Mohamed E. Assal
A rising quantity of drugs has been discharged into the aquatic environment, posing a substantial hazard to public health. In the current work, a novel hydrogel (i.Carr@Bent@PTC), comprised of iota-carrageenan, bentonite, and 4-phenyl-3-thiosemicarbazide, was successfully prepared. The introduction of 4-phenyl-3-thiosemicarbazide and bentonite in iota-carrageenan significantly increased the mechanical strength of iota-carrageenan hydrogel and improved its degree of swelling, which can be attributed to the hydrophilic properties of PTC and Bent. The recorded contact angle was 70.8°, 59.1°, 53.9°, and 34.6° for pristine i.Carr, i.Carr@Bent, and i.Carr@Bent@PTC, respectively. The low contact angle measurement of the Bent and PTC loaded-i.Carr hydrogel was attributed to the hydrophilic Bent and PTC. The ternary i.Carr@Bent@PTC hydrogel demonstrated broad pH adaptability and excellent adsorption capacities for sulfamethoxazole (SMX) and losartan potassium (LP), i.e., 467.61 mg. g −1 and 274.43 mg. g −1 at 298.15 K, respectively. The pseudo-first-order (PSO) model provided a better fit for the adsorption kinetics . The adsorption of SMX and LP can be better explained by employing the Sips and Langmuir isotherm models. As revealed by XPS and FTIR investigations, π-π stacking, complexation, electrostatic interaction , and hydrogen bonding were primarily involved in the adsorption mechanisms.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2026
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IF 7.9
Kunlin Chen,Lin Zhou,Jingyi Gu,Xiaolin Huang,Yaqi Zeng,Qingqi Wen,Jiale Yue,Chengshuai Liu,Weilin Huang,Qiaoyun Zeng,Chengyu Chen
Nanosized activated carbons (NACs) have emerged as promising adsorbents for antibiotic removal due to their excellent colloidal stability and low ecotoxicity. This study investigated four biomass-derived NACs for adsorption of oxytetracycline (OTC) and sulfamethoxazole (SMX). Both kinetic and isotherm analysis revealed higher affinity for OTC ( q max = 113.10–196.00 mg/g) than SMX ( q max = 60.66–124.90 mg/g), with adsorption capacity ranking NAC2 > NAC1 > NAC3 > NAC4. Adsorption was favored under mildly acidic conditions (pH 3–4) and at lower temperatures (20 ℃). Increased concentrations of NaCl and CaCl 2 enhanced antibiotic uptake through salting-out and complexation effects, respectively. Humic and fulvic acids significantly inhibited OTC adsorption due to steric hindrance but had minimal impact on SMX. Pore filling, hydrogen bonding, and π–π electron donor-acceptor interactions all contributed to adsorption. Density functional theory (DFT) calculations revealed that OTC had a lower HOMO-LUMO (highest occupied and lowest unoccupied molecular orbitals) energy gap (1.273 eV) and more negative binding energies (-63.5 to −182.2 kJ/mol) than SMX (2.013 eV; −47.1 to −158.2 kJ/mol), confirming its stronger chemical reactivity and affinity for NAC surfaces. The findings provide a comprehensive understanding of NAC-antibiotic interactions and demonstrate the potential of NACs for effective antibiotic remediation in aquatic environments.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 4
·123461
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IF 7.5
Rongfang Yuan,Junyi Yuan,Caiyun Zhang,Huilun Chen,Beihai Zhou,Waseem Hassan,Ao Li
Residual sulfamethoxazole (SMX) in aquatic environments poses risks to ecosystems and human health. Due to their exceptional mechanical strength and chemical durability, ceramic membranes (CMs) provide a suitable platform for heterogeneous catalytic oxidation. The synthesis of Fe 2 O 3 -CeO 2 @CM for catalyzing ozone oxidation to remove SMX was done in this study using a hydrothermal in-situ growth technique. The findings showed that when the Fe/Ce molar ratio was 1:3, the calcination temperature was 500°C, and the catalyst loading was 8.4 mg/g, the SMX was totally removed in 10 min in the presence of Fe 2 O 3 -CeO 2 @CM. The characterisation results showed that the material comprised FeCe solid solution and Fe 2 O 3 particles, exhibiting multiple valence states (Fe 2+ /Fe 3+ , Ce 3+ /Ce 4+ ). Based on the quenching experiments, ·OH, ·O 2 - , and 1 O 2 radicals were shown to be involved, with ·O 2 - and 1 O 2 playing primary roles. Mechanistically, the Fe 2+ /Fe 3+ and Ce 3+ /Ce 4+ species in the catalyst exhibited favourable redox cycling, promoting oxygen vacancy regeneration and serving as key active sites for catalysing O 3 decomposition. Furthermore, the system demonstrated excellent cycling stability, maintaining SMX removal rates above 95% after five cycles and achieving 94% removal in actual wastewater, effectively mitigating membrane fouling. An effective and reliable technique for eliminating antibiotics from wastewater is presented in this work.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Abdul Qadir,Adeel Ahmed,Pervaiz Ahmad,Aisha H. Albalawi,Zahrah Alqahtani,Haia H. Aldosari,Raza Ullah,A. Timoumi,Awais Khalid
Metal–organic frameworks (MOFs) have currently attracted interest as effective self-sacrificial templates for the fabrication of hierarchical porous metal–nanoparticle materials. This study involved the synthesis of Cu-based MOF-loaded polyacrylonitrile (MOF/PAN) fibers using electrospinning, subsequently subjected to calcination in a nitrogen environment to yield Cu nanoparticle-loaded carbon nanorods (Cu@CNRs) as heterogeneous catalysts. The catalytic performance of prepared Cu@CNRs was investigated via hydrogen peroxide (H 2 O 2 ), peroxydisulfate (S 2 O 8 2− ), and peroxymonosulfate (HSO 5 − ) activated degradation of sulfamethoxazole (SMX). The activation performance of Cu@CNRs followed the sequence: HSO 5 − > S 2 O 8 2− > H 2 O 2 , indicating that HSO 5 − was the most effective oxidant under identical conditions. The Cu@CNR-I/HSO 5 − system demonstrated exceptional efficacy, attaining 99.99 % SMX removal in 30 min and a significant rate constant of 0.2312 min −1 . The improved activity is due to the hierarchical porous structure, elevated surface area, plentiful active sites, and robust Cu-N-C/HSO 5 − synergy. The carbonization created a polarization disparity in Cu N coordination, thereby promoting PMS activation by Cu(I/II) species. Radical quenching and EPR tests revealed that SO₄ •- and OH • radicals predominated the degradation route. The primary operating factors, such as catalyst and oxidant dose, solution pH, SMX concentration, coexisting anions, and humic acid, were carefully examined. The catalyst Cu@CNR-I exhibited remarkable catalytic stability and reusability over five cycles, indicating significant potential as a sustainable heterogeneous catalyst for wastewater treatment applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Shanqi Liang,Binyu Guo,Lei Zhang,Quanyuan Chen,Lei Li,Pin Gao,Juan Zhou
The growing complexity of water contaminants necessitates a deeper understanding of the interplay between multiple pollutants and catalytic sites. Herein, we explore the simultaneous removal of sulfamethoxazole (SMX) and monoiodoacetic acid (MIAA) via liquid-phase catalytic hydrogenation over Pd nanoparticles supported on diverse carriers (CNT, C₃N₄, Al₂O₃, and SBA-15). Although all catalysts performed well in single-component tests, only Pd/CNT exhibited robust dual-removal capability in mixed systems, achieving complete deiodination of MIAA and 92.4% reduction of SMX within 60 min. Intriguingly, a mutual interference phenomenon was unveiled: MIAA suppressed SMX reduction, while SMX (and other aromatics) unexpectedly accelerated MIAA deiodination. Mechanistic studies identified the pivotal role of hydrogen spillover on Pd/CNT, which possessed a superior H₂ uptake capacity. This facilitated the generation of surface-mobile active H that migrate to the support, enabling a binary active site mechanism. We propose a sequential pathway comprising H₂ dissociative activation, spillover, direct Pd-catalyzed deiodination of MIAA, and CNT-mediated hydrogenation of SMX via spilled-over H species. These findings highlight the exceptional promise of Pd/CNT for the remediation of complex organic contaminants and provide fundamental guidance for designing bifunctional hydrogenation catalysts.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2026
·
IF 0
Zhou Baochang,Li Guifang,Pan Zhangbin,Dong Bin,Du Zhenqi,Zhang Baiqiang,Li Mei,Wang Yonglei,Jia Ruibao
At present, the most commonly used advanced oxidation technology for drinking water treatment has the disadvantage of low utilization rate of oxidant. After research and comparison, the UV/H 2 O 2 /Fe(III) combined process selected in this study can effectively degrade sulfamethoxazole (SMX) in water and improve the utilization rate of hydrogen peroxide. The results showed that the removal rate of SMX by UV/H 2 O 2 /Fe(III) process was 96.7%, and the utilization rate of H 2 O 2 was increased by 25%; the UV/H 2 O 2 /Fe(III) combined process also had a good effect on the degradation of fluorescent components and other organic matter in water; the presence of nitrite ion and humic acid significantly reduced the degradation efficiency of SMX, under the condition of nitrite ion concentration of 5 mg/L or humic acid concentration of 10 mg/L, the removal rate of SMX by UV/H 2 O 2 /Fe(III) combined process decreased by 10.68% or 11.92%, respectively. In terms of mechanism research, the reactivity of SMX molecules was theoretically calculated by density functional theory (DFT), and the atoms with higher contribution rate were calculated, and the degradation products and four degradation pathways of SMX were identified and analyzed by mass spectrometry. Finally, the potential ecological toxicity of SMX and its degradation products was predicted by ECOSAR software and luminescent bacteria experiments; it was found that the toxicity of SMX and its degradation products was relatively high at 15 min.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yong Liu,Zhao Yang,Jianlong Wang
In this study, a bimetallic Cu 0 /Zn 0 particles were prepared, characterized and used as Fenton-like catalyst for the degradation of sulfamethoxazole (SMX). The results showed that Cu 0 /Zn 0 particles were capable of converting O 2 to H 2 O 2 , O 2 − and OH radicals. In bimetallic Cu 0 /Zn 0 particles, Cu 0 /Zn 0 corrosion cells were formed through the direct contact of Zn 0 and Cu 0 , which not only accelerated the electron transfer from Zn 0 to O 2 , leading to the promotion of H 2 O 2 generation, but also enhanced the conversion of Cu 2+ to Cu + /Cu 0 , facilitating the catalytic decomposition of H 2 O 2 to produce O 2 − and OH radicals. SMX could be efficiently degraded in Cu 0 /Zn 0 -air system over a broad pH range from 3 to 9, the removal efficiency of SMX and TOC was 87.8% and 45.5%, respectively at following condition: SMX concentration, 20 mg/L; dosage of bimetallic Cu 0 /Zn 0 particles (mole ratio of Zn to Cu was 1:2), 2 g/L; air flow rate, 1.8 L/min; reaction temperature, 25℃ and without adjusting pH. The recycling use of bimetallic Cu 0 /Zn 0 particles leaded to the enhanced degradation of SMX due to the newly formed cuprous oxide (Cu 2 O), which could further catalytically activate O 2 . The quenching experiment showed that the concentration of dissolved oxygen could significantly affect the main reactive oxidant species (ROSs). Additionally, the intermediate products of SMX degradation were detected and a possible pathway of SMX degradation as well as the catalytic mechanism of Cu 0 /Zn 0 -air system were proposed.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jian Ke,Hailun Zhao,Shangkun Zhu,Zixuan Zheng,Qiulian Yang,Yanhua Liu,Ruixin Guo,Jianqiu Chen
The safe disposal of excess sludge generated from chemical wastewater treatment processes has attracted worldwide concern because of its high yield and toxicity. In our work, purified terephthalic acid excess sludge-derived biochar (PTABC) was prepared via one-step pyrolysis without additives. The prepared catalyst was demonstrated to degrade sulfamethoxazole (SMX) via the activation of peroxymonosulfate (PMS). The inhibitory effects of anions were negligible. The reactive oxygen species were investigated based on the radical scavenging experiments and electron paramagnetic resonance technique. Additionally, the electron transfer process was investigated via electrochemical measurements. The results show that the non-radical pathways take a leading role in the degradation of SMX and the corresponding contributions of sulfate radical (SO 4 •– ), hydroxyl radical (•OH) and non-radical pathways in PTABC-700/PMS system for SMX degradation were 12.59%, 3.28%, and 84.13%, respectively. Active sites of PTABC-700 responsible for SMX degradation were also proposed. Overall, this study provides a promising strategy for converting excess sludge into functional catalysts and achieving treatment of SMX-contaminated wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jiong Wang,Zhibin Liu,Zhirong Sun
In this study, a graphite felt (GF) electrode material supporting a Cu-based catalyst (CuHDC-400/GF) was prepared by a hydrothermal process and subsequent heat treatment. A heterogeneous electro-Fenton (EF) system was built to investigate the degradation of sulfamethoxazole (SMX) by the composite cathode. Scanning electron microscopy, X-ray diffraction, Raman spectroscopy , and X-ray photoelectron spectroscopy were used to characterize the physical and chemical properties of the composite cathode. The results show that the composite cathode CuHDC-400/GF has excellent catalytic performance, achieving 100 % removal of SMX (10 mg/L) within 45 min (aeration rate = 0.6 L min −1 , current density = 5 mA cm −2 , initial pH = 5.6). Furthermore, efficient removal of SMX can be achieved over a wide pH range (pH = 3–9). The electrode material can still efficiently degrade SMX after eight cycles. Compared with a heterogeneous EF system, in which the Cu catalyst was directly added to the reaction solution, using CuHDC-400/GF as the cathode realizes the in-situ catalysis of H 2 O 2 , leading to reduced catalyst consumption and enhanced electrode stability. The investigation of potential SMX degradation pathways and mechanisms revealed that the continuous production of active free radicals is facilitated by the redox cycle between Cu Ⅰ and Cu Ⅱ on the electrode surface, which can enable SMX degradation. Unlike the Fe-based Fenton reaction, the active superoxide radical O 2 – was identified as the major contributor to SMX degradation in this system, followed by the hydroxyl radical OH. The active sites for SMX degradation were predicted by density functional theory calculations. Combined with the measured mass/charge ratios, the possible degradation paths and intermediates of SMX were predicted. Furthermore, toxicity analysis shows that toxicity significantly declines after degradation. This work is expected to inspire subsequent research on heterogeneous EF cathode materials with high catalytic performance.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Zhilan Pan,Yuli Wei,Hao Guo,Bingqing Liu,Lei Sun,Zongyan Lu,Xiaoqin Wei,Hao Zhang,Yuan Chen,Wu Yang
In this work, the in-situ growth of covalent organic framework materials on polyaniline (TFAB-COF@PANI) was accomplished using a facile one-pot approach. For the microanalysis of sulfamethoxazole (SMX), a highly sensitive electrochemical sensor based on the TFAB-COF@PANI complex modified glassy carbon electrode (GCE) was constructed. The X-ray powder diffraction, Fourier transform infrared spectra, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy , and nitrogen desorption test were used to characterize the materials. The electrochemical performance of the sensor was investigated by cyclic voltammetry , differential pulse voltammetry and electrochemical impedance. Strong synergy was generated by the in-situ growth of TFAB-COF with a large specific surface area on PANI, which not only provides a large number of active sites but also amplifies the response signal of SMX. The resulted sensor displays a broad linear range (1–450 μM) and a low detection limit (0.107 μM) for SMX under optimal conditions. The sensor has been effectively utilized for reliable analysis of environmental water samples because of its high repeatability, reproducibility, stability, and interference resistance.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Peng Yi,Yani Yan,Ying Kong,Quan Chen,Min Wu,Ni Liang,Lijuan Zhang,Bo Pan
Wetting-drying cycles in the environment could change the inner- or outer-sphere complexation of heavy metal cations on natural organic matter (NOM) and then influence ternary interactions with organic contaminants - a rarely-discussed essential geochemical process. In this work, the sorption of sulfamethoxazole (SMX) on humic acids (HAs) mediated by cations (Cu 2+ and Cd 2+ ) was investigated. Considering that outer-sphere complexation could be transformed into inner-sphere complexation during vacuum freeze-drying, the role of inner- or outer-sphere complexation on SMX sorption was explored. The experimental sorption results and density functional theory (DFT) calculations suggested that Cu 2+ and Cd 2+ sorption on HAs was mainly outer- and inner-sphere complexation, respectively. Cd 2+ consistently promoted SMX sorption on HAs, while Cu 2+ promoted and inhibited SMX sorption before and after freeze-drying. The structure of HA-Cu complexes with inner-sphere complexation was more compact than those with outer-sphere complexation, which reduced the accessibility of sorption sites for SMX on HA-Cu and inhibited SMX sorption. However, the greater number of coordination sites of Cd 2+ may provide more sorption sites and the structure of HA-Cd was looser. These findings provide a groundbreaking understanding of the sorption of organics on natural adsorbents in the presence of cations.
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