SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Xue Song,Erying Xu,Weishuang Lou,Hailiang Zhao,Guanghui Yan,Xiaodan Lou,Yingming Zhang,Yongde Liu,Guihua Yan
Wheat dust (WD) is a mixed organic dust produced during the storage, transportation and processing of wheat, and its components include cellulose and ash, etc. To achieve its resource utilization, a “one-step” alkali-activated pyrolysis method was developed to prepare a Si-containing biochar (Si-WDB). Response surface methodology (RSM) was employed to optimize adsorption conditions for oxytetracycline hydrochloride (OTC). The specific surface area of Si-WDB increased to 241.75 m 2 /g, approximately 331 times that of the pristine WD (0.73 m 2 /g). Semi-quantitative pore-structure analysis suggested that mesopore-associated surface accommodation could account for approximately 72.47% of the measured adsorption capacity. Multi-scale characterizations and DFT calculations suggested that endogenous silicon was redistributed into or associated with the carbonaceous matrix during pyrolysis, providing Si-containing sites that might contribute to OTC adsorption through localized Si-involved interactions, together with π–π EDA interactions and hydrogen bonding. Life cycle assessment (LCA) confirmed a lower carbon footprint (7.06 kg CO₂ eq/kg Si-WDB), highlighting the environmental sustainability of the waste-to-resource strategy. This study established a sustainable pathway for upgrading silicon-rich agricultural waste into biochar adsorbent for antibiotic contaminated water remediation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Zhongmin Feng,Xuan Zhai,Ting Sun
Pharmaceuticals and personal care products (PPCPs) have recently become a cause of growing concern due to their persistence in the human body and in the ecosystem. Therefore, it is important to develop a material with high adsorption capacity in order to effectively remove them. In the present study, magnetic porous biochar (MAGB) obtained from a biomass garlic skin was prepared through a one-step magnetization pyrolysis and was examined via SEM, XRD, Raman, XPS, TG, VSM, and N 2 adsorption–desorption analysis. MAGB presents many advantages, such as a high specific surface area, good ferromagnetic properties, and oxygen-rich functional groups. The capacities of MAGB to adsorb paraben, metronidazole, and oxytetracycline have been reported at 415, 287, and 822 mg g −1 , respectively, which are more effective than the values recorded for most other adsorbents. Furthermore, MAGB presents a good adsorption capacity after three cycles. The removal mechanisms of PPCPs onto MAGB are attributable to pore adsorption, hydrogen bonding, π-π stacking action, and electrostatic effects. This study demonstrates the applicability of MAGB as a reliable adsorbent, which holds a great potential for the removal of PPCPs from aquatic environments.
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Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Shanshan Chen,Zhongyang Zang,Shusheng Zhang,Gangfeng Ouyang,Runping Han
Metal-organic framework and nano carbon materials were widely used in separation field in recent years. In this study, nanocomposite of MIL-100(Fe) and multi-walled carbon nanotubes (MIL-100(Fe)-CNTs) was prepared and characterized and its adsorption property towards Oxytetracycline (OTC) was presented. MIL-100(Fe)-CNTs exhibits higher adsorption capacity compared to MIL-100(Fe), making this composite as one of the favorable adsorbents. The adsorption capacity of MIL-100(Fe)-CNTs reached 429 mg·g −1 at 313 K. The langmuir model and Koble-Corrigan model were better to predict the equilibrium data while the pseudo-second-order kinetic model could well describe the kinetic process. The process was endothermic and spontaneous while the ion exchange was the main adsorption mechanism of OTC on MIL-100(Fe)-CNTs. The nanocomposite is promising to effectively remove OTC from solution.
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CHEMOSPHERE
·
2021
·
IF 7.086
Yu Wang,Xinye Gong,Deying Huang,Jibiao Zhang
Oxytetracycline (OTC) and enrofloxacin (EFX) pollution in surface water are very common. Using the algal-bacterial consortia system to remove antibiotics remains to be further studied. In this study, the algal growth and sewage purification performance were studied in an algal-bacterial consortia system with different concentrations of antibiotics. The enzyme activity , malondialdehyde content, chlorophyll-a content, extracellular polysaccharide , and protein content of algae were also tested. It was found that the algal growth was promoted by low-dose antibiotics, 21.83% and 22.11% promotion at 0.1 mg L −1 OTC and EFX, respectively. The nutrients and antibiotics removals of the low-dose groups (OTC <5 mg L −1 , EFX <1 mg L −1 ) were not affected significantly. More than 70% of total organic carbon and total phosphorus, and 97.84–99.76% OTC, 42.68–42.90% EFX were removed in the low-dose groups. However, the algal growth was inhibited, and the nutrients removals performance also declined in the high-concentration groups (10 mg L −1 OTC, 5 mg L −1 EFX). The superoxide dismutase and catalase activity, and malondialdehyde content increased significantly ( P < 0.05), indicating the increased activity of reactive oxygen species . In addition, the decreased chlorophyll-a content, thylakoid membrane deformation, starch granules accumulation, and plasmolysis showed that the algal physiological functions were affected. These results showed that the algal-bacterial consortia system was more suitable to treat low-concentration antibiotics and provided basic parameters for the consortia application.
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TOXICOLOGY MECHANISMS AND METHODS
·
2021
·
IF 2.987
Lirui Hou,Fang Liu,Chong Zhao,Lihong Fan,Hongbo Hu,Shutao Yin
Oxytetracycline (OTC) and Quinocetone (QCT) are antimicrobials, whose residues have been found in food and environment. These two are sometimes used simultaneously in livestock and aquaculture, potentially resulting in the simultaneous consumption of multi-antimicrobials by consumers. However, the combined toxic effects of this phenomenon have yet to be addressed. Since the liver is a major target of both OTC and QCT, we tested their hepatotoxic effect using both cell cultures and animal models. Results showed that the QCT (5–25 μM) or OTC (20–100 μM) treatments alone caused dose-dependent reductions in cell numbers, while their combination strongly further enhanced inhibitory effects. Mechanistically, the combination enhanced the generation of reactive oxygen species (ROS) and activated mitochondrial cell death pathways. It also showed that the combination of OTC (800 mg/kg, i.g., 5d) and QCT (5000 mg/kg, i.g., 5d) resulted in significantly enhanced liver toxicity in C57BL/6N mice, the serum alanine transaminase (ALT) and aspartate transaminase (AST) were significantly increased by the OTC/QCT. These findings indicate the necessity of considering the combined toxicity of these two antimicrobials in safety assessments.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Shengjun Ye,Xiao Zhou,Yanbin Xu,Weikang Lai,Kai Yan,Lu Huang,Jiayin Ling,Li Zheng
To enhance the photocatalytic performance of bismuth vanadate (BiVO 4 ) and reveal its catalytic mechanism, a multi-walled carbon nanotube photocatalyst (MWCNT/BiVO 4 ) was prepared by sol-gel preparation and an electro-spinning process. Oxytetracycline was used as the target trace persistent pollutant to research its potential degradation pathways catalyzed by MWCNT/BiVO 4 . X-ray powder diffraction spectroscopy (XRD), Raman spectra, field emission scanning electron microscopy (FE-SEM) and field emission transmission electron microscopy (FE-TEM) were used to observe the crystalline phase, morphological structure of MWCNT/BiVO 4 . The modification by MWCNTs caused changes of functional groups on the surface and a binding energy shift of Bi4f and V2p, as determined from X-ray photoelectron spectroscopy (XPS). Ultraviolet–visible diffuse reflectometry (UV–Vis DRS) revealed that the band gap became narrower and photoluminescence spectra suggested the recombination of photogenerated electron–hole pairs were inhibited after MWCNT modification. All of the characterizations showed enhancement of catalytic performance of MWCNT/BiVO 4 . The results from the high-performance liquid chromatography (HPLC) indicated that the degradation rate of oxytetracycline had increased by 42.2% and reached 88.7% within 60 min. Electron paramagnetic resonance (EPR) signals of ·OH and ·O 2 − were detected and potential photocatalytic mechanisms of the photocatalysts were put forward. Six reaction pathways were proposed based on ultra-performance liquid chromatography triple-quadrupole tandem mass spectrometry (UPLC–MS/MS) results: demethylation (−14 Da), secondary alcohol oxidation (−2 Da), dehydration (−18 Da), hydroxylation (+16 Da), decarbonylation (−28 Da) and deamination (−15 Da). The present study provides a reference for the application of photocatalytic degradation by MWCNT/BiVO 4 on hard degradable substances in aquatic environment.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-8
·
IF 5.479
Duan Wei,Yan Pengcheng,Dong Jintao,Chen Yun,He Xiaoyang,Chen Jianping,Qian Junchao,Xu Li,Li Henan
A self-powered photoelectrochemical (PEC) aptamer probe is presented for the determination of oxytetracycline (OTC). The assay is based on the use of g-C 3 N 4 and NiO nanocrystals (NCs) which form a heterojunction. The latter was prepared by two-step hydrothermal pyrolysis by using the ionic liquid 1-hydroxyethyl-3-methylimidazole chloride which functions as a morphological template to form NiO NCs. The heterojunction exhibits much better electronic conductivity, wider absorption range, higher electron-hole-separation productivity, and stronger photocurrent compared to plain g-C 3 N 4 . The heterojunction was adopted to construct a self-powered PEC aptamer probe for OTC detection. An OTC-binding aptamer was immobilized on the heterojunction and the probe was constructed. The aptamer on the probe binding with OTC can form steric hindrance for transmitting of electrons and cause the PEC signal change depending on the OTC concentration. The photocurrent decreases with increasing OTC concentration in the 0.01 to 100 nM concentration range and its detection limit is 4 pM (at S/ N = 3).
Schematic representation of a self-powered photochemical aptamer probe. The probe performs enhanced ability for oxytetracycline (OTC) determination due to the formation of NiO nanocrystals/g-C 3 N 4 (NiO NCs/g-C 3 N 4 ) heterojunction and the specification recognition of the aptamer.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2018
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IF 4.841
Haochi Liu,Lan Ding,Ligang Chen,Yanhua Chen,Tianyu Zhou,Huiyu Li,Yuan Xu,Li Zhao,Ning Huang
Biomass carbon dots (CDs) prepared by sweet potato peels were superior fluorophores with low toxicity and excellent photostability. A novel designed fluorescence probe for specific recognition and sensitive detection of oxytetracycline (OTC) was fabricated with CDs and molecularly imprinted polymer (MIP). The quenching of CDs happened when rebinding with OTC due to electron-transfer-induced fluorescence quenching mechanism. The fluorescence probe was successfully applied in honey with the recoveries ranging from 90.2% to 97.3%. The detection limit of OTC was 15.3 ng mL −1 . This work provides promising perspectives that the development of fluorescent MIP will be valuable for rapid analysis in complex samples.
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RSC Advances
·
2014
·Vol. 4
·期 20
·10273-10279
·
IF 3.708
Wei Xu,Su Liu,Jinghua Yu,Min Cui,Jie Li,Yuna Guo,Hongzhi Wang,Jiadong Huang
In this work, we explored an amplification strategy which was based on graphene oxide–polyaniline (GO–PANI) and horseradish peroxidase (HRP) to construct the competitive aptasensor for ultrasensitive detection of oxytetracycline (OTC). In the protocol, the GO–PANI film was immobilized on the surface of the electrodes. Then, gold nanoparticles (AuNPs) were electrodeposited on the electrode surface using a constant potential stripping technique. The selected aptamer which had high affinity and specificity for OTC was used as a capture probe and labeled with HRP. The linear response to OTC concentration of the developed aptasensor was in the range of 4.0 × 10−6 mg L−1 to 1.0 mg L−1. The detection limit (LOD) of 2.3 × 10−6 mg L−1 was obtained (S/N = 3). In addition to good repeatability and stability, the proposed aptamer sensor also showed the advantages of low background current and high sensitivity to examine OTC in real samples.
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PROCESS BIOCHEMISTRY
·
2024
·
IF 3.7
Xinqin Jiang,Jian Huang,Hua Zhang,Hao Liu,Xianjin Qiu
The direct equalizing ray method was employed to design three groups of mixtures of oxytetracycline(OTC) and norfloxacin(NOR) with varying proportions(Group R1 had a higher proportion of OTC, while R2 had similar concentrations of both antibiotics, and R3 had a higher proportion of NOR).The effects of these mixtures on the content and properties of extracellular polymeric substances (EPS) in the biological denitrification process were investigated using an sequencing batch reactor activated sludge reactor (SBR). The results revealed that the removal rates of ammonia nitrogen(NH 3 -N) decreased in all three groups with the addition of antibiotics. As the antibiotic concentration increased, the EPS content decreased by 68.46%, 55.53%, and 65.03% in R1, R2, and R3, respectively. To understand the interaction mechanism of mixed antibiotics on EPS in activated sludge, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) techniques were employed. The findings demonstrated significant effects of mixed antibiotics on functional groups such as C-O, C O, and C-O-C. Specifically, hydrogen bonding was found to be the primary influencing factor in the R1 ratio, while Π-Π conjugation played a major role in the R3 ratio.
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MOLECULES
·
2024
·Vol. 29
·期 23
·5725
·
IF 4.2
Haitao Ren,Fan Qi,Ke Zhao,Du Lv,Hao Ma,Cheng Ma,Mohsen Padervand
Improving the photogenerated carrier separation efficiency of individual semiconductor materials has always been a key challenge in photocatalysis. In this study, we synthesized a novel photocatalytic material, N-CQDs/UBWO, in situ by combining nitrogen-doped carbon quantum dots (N-CQDs) derived from discarded corn stover with ultrathin Bi2WO6nanosheets (UBWO). Detailed characterization indicates that the random distribution of N-CQDs on the UBWO surface increases the specific surface area of UBWO, which is beneficial for the adsorption and degradation of oxytetracycline (OTC). More importantly, N-CQDs act as electron acceptors, promoting the effective separation of photogenerated charges, prolonging the lifetime of charge carriers in UBWO, and thereby enhancing the degradation efficiency of OTC. As a result, the optimized 3wt%N-CQDs/UBWO could degrade 85% of OTC within 40 min under visible light, with a removal rate four times that of pure Bi2WO6. The performance of photocatalytic degradation over OTC by 3wt%N-CQDs/UBWO exceeds that of most reported Bi2WO6-based photocatalysts. The EPR analysis confirmed that ∙O2−and ∙OH are the main active species in the photocatalytic degradation of OTC on 3wt%N-CQDs/UBWO. This study provides insight into designing green, low-cost, and efficient photocatalysts using CQDs derived from waste biomass and the degradation of emerging pollutants like antibiotics.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Long Wang,Xia Lu,Yan Zhang,Yuxin Wang,Yi Ding,Mengjia Liu,Shangchen Fu,Wupeng Ge
In this work, a simple, convenient and cost-effective colorimetric aptasensor was successfully constructed for the detection of antibiotic residues in raw milk based on the property that aptamer (Apt) synergistically enhances the catalase-like activity of MOF-235. Under optimised conditions, the proposed colorimetric aptasensor exhibited a wide detection range (15–1500 nM) with a low detection limit (6.92 nM). Furthermore, the proposed aptasensor demonstrated high selectivity, good resistance to interference and storage stability. The proposed aptasensor was validated by spiking recovery in camel milk, cow milk and goat milk with satisfactory recoveries, which demonstrated the great potential of the aptasensor for further application in real food samples, and also suggested that MOF-235 can be used as a potential universal platform to build a sensitive detection platform for other targets.
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