SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Zhongjuan Wang,Yunhe Li,Guohua Shen,Yuanqing Li,Xinyi Zhang,Jianfeng Gou,Xiuwen Cheng
In recent decades, persulfate activation technology has been used to degrade persistent organic pollutant. Moreover, both transition metal-based catalyst and metal-free catalyst have become more efficient activator. In this study, Cu-Fe LDH was synthesized and calcined at different temperature to form into metal oxides (CLDH). Then, the CMK/LDH and CMK/CLDH composites were fabricated by co-precipitation and sonic treatment, respectively. Furthermore, the prepared samples were used to activate PS for sulfamethoxazole degradation. Based on the several characterizations and degradation experiments, a comparative study of different catalysts was conducted and the results reached the following factors: i CMK/LDH owned the best capacity of PS activation on sulfamethoxazole decomposition, 84.9% SMX of 25 mg/L was degraded with less dosage of persulfate (0.5 g/L) and catalyst (0.15 g/L) being added. ii CMK/CLDH owned the better adaptability of initial pH value compared with CMK/LDH. Meanwhile, based on scavenger quenching experiment and chronoamperometric, it was speculated that non-radical pathway played more role in CMK/LDH composite/PS/SMX system compare with radical pathway. It was interesting to find that SO 4 • − were mainly generated by LDH while HO• were mainly produced by CMK part. However, the non-radical pathway for SMX decomposition was only ascribed to the electron bridge effect that the CMK owned. This study might provide a theoretical support for further studies on comparison about LDH and the metal oxides originating from calcination of LDH for PS activation.
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2020
·Vol. 7
·期 5
·1444-1453
·
IF 7.683
Shang Yanan,Xu Xing,Qinyan Yue,Baoyu Gao,Yanwei Li
In this work, the carbon nanotubes (CNTs) encapsulating Zn and Fe bimetallic nanoparticles (FeZn@NC) were synthesized through a one-pot pyrolytic strategy. The persulfate (PS) activation ability of FeZn@NC with various ratios of Fe and Zn was determined by sulfamethoxazole (SMX) degradation. The results indicated that the iron played a key role in forming external CNTs and the catalytic activity of FeZn@NC was mainly based on the encapsulated FeZn nanoparticles. In addition, PS activation was greatly strengthened by the heterostructure of FeZn@NC. Free radical quenching experiments and electron paramagnetic resonance (EPR) spectra suggested that the singlet oxygen was the key reactive oxygen species for SMX degradation. The activity of pyridinic-N, pyrrolic-N and graphitic-N on external CNTs was analyzed by theoretical calculations, which showed the pyridinic-N possessed strong adsorptive ability to activate PS to degenerate sulfate radicals.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Shaofei Guo,Xiaoyu Chen,Yuetao Ling,Han Wang,Xin Wei,Ruihua Pan,Peng Wang
A highly sensitive electrochemical nanostructure sensor based on a ZnO@ZIF-8 nanocomposite-modified carbon paste (ZnO@ZIF-8/CPE) electrode was constructed for trace analysis of sulfamethoxazole (SMX). ZnO@ZIF-8 was synthesized by the hydrothermal method and characterized using scanning electron microscopy and X-ray diffraction. Electrochemical experiments demonstrated a synergistic effect of ZnO and ZIF-8 that endowed the prepared sensor with excellent electrocatalytic behavior towards SMX oxidation. Under optimal conditions, the ZnO@ZIF-8/CPE sensor demonstrated a wide linear range of 0.04-50 μM for SMX and a regression coefficient of 0.9914 and a limit of detection of 0.02 μM. The sensor possessed good stability, selectivity, anti-jamming ability and reproducibility and was successfully used for SMX determinations in egg samples. The proposed sensor is ready to use for biomedicine and environmental protection monitoring.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Xiaoqin Shen,Bing Yan
The application of covalent organic frameworks (COFs) in fluorescence detection is of great interest. Herein, we have synthesized the ionic covalent organic framework TGH + ·PD: Eu(TTA) 4 with the characteristic emission of lanthanides by a straightforward ion-exchange method. This is the first time that aristolochic acid A (AA), a key biomarker for absorption and metabolism in the body for early diagnosis of diseases, has been detected by using COF as a fluorescent probe , which exhibits a good linear correlation with the AA concentration over a range from 5.0 to 1000 μM with a detection limit of 0.0808 μM. In addition, the selective response to sulfamethoxazole (SMZ)/trimethoprim (TMP) is achieved by varying the excitation wavelength with detection lines of 30.2 nM and 2.898 μM, respectively. It is worth mentioning that BNPP has been developed for the accurate determination of SMZ in uncertain samples. In a word, the prepared TGH + ·PD: Eu(TTA) 4 -based sensor can be used for the quantitative detection of AA and SMZ/TMP, separately, effectively extending the application of COFs in the field of fluorescence sensing.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Yawei Shi,Guozhu Liu,Liang Wang,Hongwei Zhang
Sucrose and phytic acid as abundant biomass resources have been combined for the fabrication of highly porous carbons with surface areas up to 1897 m 2 /g through hydrothermal carbonization and phytic acid-induced in-situ activation in the absence of additional activation agents. The carbons were employed as efficient adsorbents for the adsorptive removal of sulfamethoxazole (SMX) from water and the adsorption of dibenzothiophene (DBT) from model fuels. Kinetic and isotherm studies were performed for both processes. The effect of pH and ionic strength on SMX adsorption as well as the effect of arene on DBT adsorption was also investigated. By comparing the two adsorption processes , it was found that heteroatom doping could promote DBT adsorption obviously, but its effect on SMX adsorption was less straightforward. This was mainly attributed to the divergent solution media and thus the different adsorption mechanisms between aqueous and non-aqueous adsorption processes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Ying Zhang,Ming-Zhi Shen,Jian-Xia Wang,Jing-Han Wang,Zhan-You Chi
Microalgae-based wastewater treatment could realize simultaneous nutrients recovery and CO 2 sequestration. However, impacts of environmental microplastics (MPs) and antibiotic co-exposure on microalgal growth, nutrients removal, intracellular nitric oxide (NO) accumulation and subsequent nitrous oxide (N 2 O) emission are unclarified, which could greatly offset the CO 2 sequestration benefit. To reveal the potential impacts of environmental concentrations of MPs and antibiotic co-exposure on microalgal greenhouse gas mitigation, this study investigated the effects of representative MPs (PE, PVC, PA), antibiotic sulfamethoxazole (SMX), and nitrite (NO 2 - -N) in various combinations on attached Chlorella sorokiniana growth, nutrients removal, anti-oxidative responses, and N 2 O emission originated from intracellular NO build-up. Microalgal biofilm growth was more inhibited under 10 μg/L MPs than 100 μg/L SMX, and MPs+SMX co-exposure displayed toxicity antagonism while MPs+MPs co-exposure caused toxicity synergism (up to 66 % growth inhibition). Extracellular polysaccharides content correlated well with microalgal biofilm density under various stresses, while SMX involved stresses displayed chlorophyll a content reduction. Microalgal assimilation and MPs adsorption contributed to nutrients removal, and phosphorus removal displayed less variance among different stresses (residual phosphorus <0.5 mg/L) than nitrogen. Intracellular NO conversion to N 2 O almost doubled during the co-exposure processes, and N 2 O emission under NO 2 - -N + PE+PVC co-exposure could offset the contribution of microalgal CO 2 sequestration by as high as 176.2 %. Results of this study appealed for urgent concern regarding environmental MPs and antibiotic co-exposure on primary producers’ growth characteristics and their greenhouse gas mitigation properties.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water
·
2024
·Vol. 16
·期 4
·532
·
IF 3
Juxiang Chen,Chong Ruan,Wanying Xie,Caiqiong Dai,Yuqiong Gao,Zhenliang Liao,Naiyun Gao
The degradation of sulfamethoxazole (SMX) via the Fe2+/Ultraviolet (UV)/sodium percarbonate (SPC) system was comprehensively investigated in this study, including the performance optimization, degradation mechanism, and predicting models. The degradation condition of SMX was optimized, and it was found that appropriate amounts ofCFe2+(10~30 μM) andCSPC(10 μM) under an acidic condition (pH = 4~6) were in favor of a higher degradation rate. According to probe compound experiments, it was considerable that∙OHand∙CO3−was the primary and subordinate free radical in SMX degradation, andk∙OH,SMXmaintained two times more than that ofk∙CO3−,SMX, especially under acidic conditions. The UV direct photolysis and other active intermediates were also responsible for the SMX degradation. These active intermediates were produced via the Fe2+/UV/SPC system, involving∙HO2,HCO4−,∙O2−, or1O2. Furthermore, when typical anions co-existed, the degradation of SMX was negatively influenced, owing toHCO3−andCO32−possibly consuming∙OHor H2O2to compete with SMX. In addition, the prediction model was successfully established via the back-propagate artificial neural network (BP-ANN) method. The degradation rate of SMX was well forecasted via the Back-Propagate–Artificial Neural Network (BP-ANN) model, which was expressed asYpre=tanh(tanh(xiWih)Who). The BP-ANN model reflected the relative importance of influence factors well, which was pH >t>CFe2+≈CSPC. Compared to the response surface method Box–Behnken design (RSM-BBD) model (R2= 0.9765, relative error = 3.08%), the BP-ANN model showed higher prediction accuracy (R2= 0.9971) and lower error (1.17%) in SMX degradation via the Fe2+/UV/SPC system. These findings help us to understand, in-depth, the degradation mechanism of SMX; meanwhile, they are conducive to promoting the development of the Fe2+/UV/SPC system in SMX degradation, especially in some practical engineering cases.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xin Mi,Xiang Li
Pharmaceutically active compounds (PhACs) are ubiquitously detected in water matrices, arousing growing concern. Effective abatement of these toxic environmental contaminants is challenging but of great importance. Ce-based MOFs have been considered novel metal–organic framework (MOFs)-based photocatalysts in water treatment. However, limited light absorption ability, fast recombination of photogenerated carriers, and water stability limited the further application. Here, the UiO-66 (Ce) was successfully constructed onto the surface of a series of graphene oxide (GO) (1 mg ∼ 7.5 mg) in situ. GO with oxygen-containing functional groups (OCFGs) increased the adsorption (∼45 %) of the trace amount of sulfamethoxazole (SMX) (200 μg/L) over the interfaces and enhanced the degradation efficiency of SMX. The composite with the optimal ratio (GO@ UiO-66 (Ce)-5) significantly increased the charge separation ability and produced a large number of reactive oxygen species (ROS). •O 2 – was proved to be the major driving reactive substance for SMX degradation with the calculated steady-state concentration of 2.5 × 10 -9 M (∼1.37 times higher with bubbled oxygen), which is much higher than that of detected •OH (1.62 × 10 -14 ). Major operational parameters including dissolved oxygen, initial solution pH, and catalyst dosages were investigated systematically. Several intermediates were identified by high-performance liquid chromatography coupled with triple quadrupole mass spectrometry (HPLC-MS/MS). By choosing the strategy, MOFs were closely bonded to the surface of the GO matrix, making the leakage of Ce ions inhibited obviously (∼3 times) in the water treatment process. This study offers useful guidance for improving the performance of existing photocatalytic materials for PhACs removal.
✓ 已验证
DOI
高影响因子
Sensors & Diagnostics
·
2022
·Vol. 1
·期 5
·1052-1062
·
IF 0
Qingyu Gu,Zhongxue Wang,Qianwen Ding,Huiling Li,Ping Wu,Chenxin Cai
An electrochemical sensor based on single-atom cobalt-anchored nitrogen-doped carbon catalysts (Co/N–C SACs), synthesized by pyrolyzing zeolitic imidazolate frameworks (Co-ZIF-8), was constructed to quantify sulfamethoxazole (SMX), a member of the sulfonamide family of antibiotics, in environmental water samples. The quantification depends on the electrocatalytic oxidation of the aromatic –NH2 group in the SMX molecule to the hydroxylamine group (–NHOH). The sensor was fabricated by depositing the Co/N–C SAC suspension (in a mixture of water, ethanol, and Nafion) on a glassy carbon (GC) electrode surface. The response of the sensor showed a linear relationship with SMX in a wide range of concentration (0.08–66.5 μM) with a limit of detection (LOD) of ∼15 nM at a signal-to-noise (S/N) ratio of 3. The sensor also had high repeatability, reproducibility, and stability. Moreover, it exhibited high selectivity and resistance to interference in the presence of other antibiotics (trimethoprim, ciprofloxacin, and norfloxacin selected randomly), endocrine disruptors (17β-estradiol), pesticides (carbaryl), common aqueous ions (Na+, K+, Fe3+, Cu2+, Ca2+, Cl−, Br−, CO32−, SO42−, and NO3−), and common surfactants (sodium dodecyl sulfate and Triton X-100). Furthermore, the sensor was used to quantify the SMX in environmental water samples (lake water, groundwater, and secondary wastewater) with high accuracy. This electrochemical method can be used for quantifying SMX in environmental water samples for various applications, including biomedical analysis, environmental pollutant detection, and water safety evaluation.
✓ 已验证
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Khouloud Talbi,Lamia Mammeri,Bouchra Lekikot,Mohamed El Hadi Benssassi,Tahar Sehili
Fenton process is among the most effective advanced oxidation process in wastewater treatment , but the necessity to work at acidic pH, in order to avoid metal precipitation, limits its large-scale application. In this work, a new Fenton-like process using copper(II)-nitrilotriacetic acid (Cu II -NTA) complex as catalyst, was used for the activation of hydrogen peroxide (H 2 O 2 ) to degrade sulfamethoxazole (SMX) in aqueous medium under neutral pH conditions. The results showed that the Cu II -NTA/H 2 O 2 process was not efficient in the degradation of SMX. The reason being that the generation of HO radicals is still limited by the extremely slow Cu II -NTA/Cu I -NTA redox cycle. Therefore, the combination of hydroxylamine (HA) accelerate the Cu I recovery to induce the continuous production of HO radicals by the decomposition of H 2 O 2 . It was evident that the steady-state Cu I concentration in Cu II -NTA/HA/H 2 O 2 process was much elevated than the Cu II -NTA/H 2 O 2 process due to the quick regeneration of Cu I -NTA complex by HA. Kinetic profiles were evaluated under a wide range of experimental conditions in order to assess the effects of the initial concentrations, working pH, Cu(II):NTA molar ratio and reaction temperature. The results showed that the degradation rates were enhanced with the increase of H 2 O 2 and Cu II -NTA concentration during SMX oxidation. SMX was fully (83.64 %) degraded for an initial SMX concentration of 0.01 mM and an optimal Cu(II):NTA molar ratio of 1:1. Solution pH influenced SMX degradation and the highest degradation rate constant was achieved at pH 7.2. The radical scavenging experiments indicates that hydroxyl radical (HO ) has major role for SMX degradation. The presence of metal ions such as Mg II , Ca II and Mn II had no impacts or little inhibitory effect on the Cu II -NTA complex catalyzed Fenton-like reaction, however, a complete degradation of SMX was achieved in the presence of Fe III ions. Also, the effects of various inorganic anions such as Cl − , SO 4 2− , NO 3 − and HCO 3 − on the oxidation efficiency of SMX were studied. The efficiency of mineralization of aqueous solution of SMX was evaluated by measuring total organic carbon (TOC). These results demonstrate that Cu II -NTA catalyzed Fenton-like oxidation may be an efficient approach for remediation of wastewater containing antibiotics.
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Chong Wang,Wendong Xing,Yilin Wu,Yunhui Li,Yongsheng Yan,Jianwei Zhu
Sulfamethoxazole (SMX) is a widespread organic contaminant that threatens the ecological environment and human health. Therefore, it is of great significance to develop an effective method for selective separation of SMX from the aquatic environments. Herein, a novel in-situ synthesis of CNT/UiO-66-NH 2 based molecularly imprinted nanocomposite membranes (CUMIMs) is designed for selective removal of SMX. The CNT/UiO-66-NH 2 nanocomposite is prepared through in-situ growth of MOFs in the presence of CNT . The CNT around the MOFs can effectively avoid the aggregation of CNT/UiO-66-NH 2 nanocomposite and introduce unique properties into the PVDF/PVA membrane, which simultaneously benefit in both hydrophilicity and water flux. More importantly, the well dispersed CNT/UiO-66-NH 2 nanocomposite with huge specific in the membrane can facilitate the selectivity toward SMX. The selective separation performance of CUMIMs is evaluated by static adsorption and permeselectivity experiments. The results showed that the synthesized CUMIMs afford an ideal rebinding selectivity (α SMX/SMM = 2.01, α SMX/TC = 4.34, and α SMX/CIP = 4.65) and permselectivity factor (β = 2.15) toward SMX. The presented strategy on CUMIMs fabrication would potentially enrich the application of CNT/MOFs-based molecularly imprinted nanocomposite membrane in the field of contaminant separation.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Xiufen Han,Xiaohui Zhang,Lijuan Zhong,Xiao Yu,Haiyun Zhai
Novel sulfamethoxazole molecularly imprinted polymers based on magnetic metal–organic frameworks/graphene oxide composites (MOF/MGO@MIP) were synthesized using the surface molecular imprinting technique. The scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and other characterization methods were used to analyze MOF/MGO@MIP. The adsorption performance of MOF/MGO@MIP was studied via adsorption kinetics, adsorption isotherms and selectivity experiments, and then its adsorption mechanism was investigated using various adsorption models. The adsorption results matched well with a quasi-second-order kinetic model and a Langmuir isotherm model, with the maximum adsorption capacity, equilibrium adsorption time and imprinting factor of 42.65 mg g −1 , 120 min and 1.61, respectively. Meanwhile, the MOF/MGO@MIP with excellent recyclability displayed higher adsorption capacity and selectivity than MOF/MGO@NIP. Under the optimal extraction conditions, a method base on MOF/MGO@MIP combined with high-performance liquid chromatography (MOF/MGO@MIP/HPLC-UV) was established to separate and detect trace sulfonamides in honey and milk samples, achieving lower limits of detection (LOD, 0.39–0.47 μg kg −1 ) with an excellent linear correlation (R 2 > 0.9990). The spiked recovery and relative standard deviation (RSD) were 81.38–96.71% and 1.4–6.3%, respectively. Therefore, MOF/MGO@MIP could be regarded as an efficient adsorbent for SAs pretreatment in food samples.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）