NEW JOURNAL OF CHEMISTRY
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2024
·
IF 2.7
Yuying Zhang,Na Li,Lianmei Chen,Fangrui Yu,Xueru Sheng,Jian Zhang,Qingwei Ping,Hongbin Li
Laccase immobilization is an effective way to realize the industrial application of laccase, but the loss of immobilized laccase activity is serious, which is an urgent problem to be solved. In this study, a novel laccase immobilization material was prepared by mixing waste Mn–Cu-loaded activated carbon with cellulose solution and regenerated in hydrochloric acid solution, which significantly improved the immobilized laccase activity. The optimum immobilization conditions (T, pH and initial laccase concentration) of Mn–Cu-AC/cellulose beads (Mn–Cu-ACC) for laccase were studied by the response surface method. Under the optimum conditions (T = 43 °C, pH = 4.0 and c = 6.8 g L−1), immobilized laccase (Laccase@Mn–Cu-ACC) showed excellent performance in terms of pH stability, thermostability and storage stability. And the enzyme activity of the laccase immobilized on the Mn–Cu-ACC carrier remarkably increased by 29.6% compared to that of the ACC. At last, the Laccase@Mn–Cu-ACC was used for the degradation of bisphenol A (BPA). Under the optimum conditions (t = 5.5 h, T = 45 °C, pH = 4.0 and initial cBPA = 70 mg L−1), the removal rate of BPA reached 72.3% in the first cycle, and after 5 cycles of reusing the immobilized laccase, the relative removal rate of BPA was retained at 53.2% of the initial removal rate. This study developed a new type of immobilized laccase carrier and provided a new path for the application of waste heavy metal loaded activated carbon.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Fangxin Deng,Shoushu Wei,Xiangwei Zhang,Yanping Zhu,Qingze Chen,Zhiyi Deng,Runliang Zhu
A novel single-atom-like Co/Fe catalyst (i.e., Co/Fe-N-C) was synthesized by pyrolysis of a Zn/Co/Fe zeolitic imidazolate framework, and applied in peroxydisulfate (PDS) activation for removal of organic contaminants from wastewater. The isolated diatomic metal-nitrogen sites were detected by X-ray adsorption fine-structure. The degradation of four contaminants (i.e., phenol, bisphenol A, 2,4-dichlorophenol, and N-methyl-2-pyrrolidone) with a concentration of 100 mg/L could be degraded separately within 20 min by the Co/Fe-N-C system with 10 mmol/L of PDS, 0.5 g/L of catalyst dosage, and initial pH of 3. Besides, 79.2 % of phenol could be mineralized in 120 min, and the turn-over frequency value of the catalyst was calculated to be 27.17 min −1 , which was higher than the commonly reported homogeneous PS-AOPs. Moreover, the Co/Fe-N-C exhibited high stability (mineralization rate over 70 % after 5 cycles), a wide initial pH range (3−9), and high catalytic performance at 5–20 mmol/L of PDS concentrations. Based on the analysis of radical scavenging experiments and electron spin resonance spectra, the radical and non-radical pathways for PDS activation were proved in the system, and the contribution of phenol degradation by each pathway was clarified.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Li Wang,Lin Liu,Runan Chen,Ya Jiao,Kaixin Zhao,Yongli Liu,Guifen Zhu
Highly selective removal of residual cephalosporin antibiotics from complex systems is crucial for human health and ecological environment protection. Herein, a newly molecularly imprinted polymer adsorbent (CPDs-NH 2 @MIP) with enhanced selectivity for ceftiofur sodium (CTFS) was developed by using the special carbonized polymer dots (CPDs-NH 2 ) as functional monomer . The CPDs-NH 2 has a nano-spherical structure and functionalized groups (C C, −NH 2 ) via the incomplete carbonization polymerization of citric acid , acrylamide and ethylenediamine , which can accurately interact with CTFS by overcoming steric hindrance , resulting in more precisely imprinted sites and reducing non-imprinted regions in MIP. The presented CPDs-NH 2 @MIP exhibited excellent adsorption capacity for CTFS (68.62 mg g −1 ), achieving equilibrium within 10 min, and highly selectivity in mixed solution containing five coexisting substances, with an imprinted factor (5.61). Compared with commercial adsorbents and MIPs prepared with traditional chain functional monomers, the CPDs-NH 2 @MIP showed significant advantage in selective recognition and separation of target. Analysis of microstructure and mechanism proved that usage of the spherical functional monomer generated precise imprinting sites and dense structure in CPDs-NH 2 @MIP, which effectively enhanced the selectivity in complex system combined with hydrogen bonding interaction. The idea of designing and using spherical functional monomer will promote the practicality of molecularly imprinted polymer adsorbents.
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PubMed
高影响因子
JOURNAL OF MASS SPECTROMETRY
·
2024
·Vol. 59
·期 11
·e5098
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IF 1.9
Dimei Hu,Lulu Yu,Zijian Wei,Lingpeng Zhan,Peiqi Luo
A novel inorganic nonmetallic material boron carbide (B 4 C) was applied in paper spray ionization to analyze organic molecules in both negative and positive modes. The utilization of B 4 C has led to a notable enhancement in signal responses for various molecules, including bisphenols and drugs, by approximately two to four times. The limit of detection (LOD) of bisphenol AF and nilotinib standard solutions can reach 1 and 0.5 μg/mL, respectively. Moreover, linear relationships for bisphenol AF was established within the concentration range of 1–100 μg/mL, exhibiting strong correlation coefficients. Recovery experiments for BPAF in water samples from the inlet and outlet of a sewage treatment plant, conducted without any pretreatment, achieved a maximum recovery rate of 98.8% and an RSD below 9.78%.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Kaili Xu,Yimeng Li,Qian Li,Guorong Yi,Runyu Gao,Kuok Ho Daniel Tang,Esmat F. Ali,Peter.S. Hooda,Sabry M. Shaheen,Ronghua Li
Bisphenol-A (BPA) is an emerging hazardous contaminant, which is ubiquitous in the environment and can cause endocrine disruptor and cancer risks. Therefore, biodegradation of BPA is an essential issue to mitigate the associated human health. In this work, a bacterial strain enables of degrading BPA, named BPA-LRH8 (identified as Xenophilus sp.), was newly isolated from activated sludge and embedded onto walnut shell biochar (WSBC) to form a bio-composite (BCM) for biodegradation of BPA in water. The Langmuir maximum adsorption capacity of BPA by WSBC was 21.7 mg g −1 . The free bacteria of BPA-LRH8 showed high BPA degradation rate (∼100 %) at pH 5–11, while it was lower (＜20 %) at pH 3. The BCM eliminated all BPA (∼100 %) at pH 3–11 and 25–45 °C when the BPA level was ≤ 25 mg L −1 . The spectrometry investigations suggested two possible degradation routes of BPA by Xenophilus sp. In one route, BPA (C 15 H 16 O 3 ) was oxidized to C 15 H 16 O 3 , and then broken into C 9 H 12 O 3 through chain scission. In another route, BPA was likely hydroxylated, oxidized, and cleaved into C 9 H 10 O 4 P 4 , which was further metabolized into CO 2 and H 2 O in the TCA cycle. This study concluded that the novel isolated bacteria (BPA-LRH8) embedded onto WSBC is a promising and new method for the effective removal of BPA and similar hazardous substances from contaminated water under high concentrations and wide range of pH and temperature.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Hong Chen,Wendong Li,Yue Wang,Shouzhen Li,Jichao Zhang,Caijiao Yu,Qixia Liu,Haoru Shan,Jianlong Ge
Carbon nanofibrous membranes (CNFMs) are promising materials for treating oily wastewater, but their broad application is limited by challenges such as hydrophobicity, lipophilicity, and poor flexibility. In this study, we developed a superhydrophilic and underwater superoleophobic CNFM with enhanced flexibility through electrospinning using polyacrylonitrile and benzoxazine as precursors. The morphology, mechanical properties, and surface wettability of CNFMs were effectively regulated by incorporating silica nanoparticles (SiO 2 NPs) into the spinning solutions. With an optimal doping level of SiO 2 NPs (over 23 wt% relative to the polymers), the resulting CNFM exhibited a biomimetic hierarchical structure and robust mechanical flexibility. A proposed mechanism indicates that doped SiO 2 NPs within the carbon nanofiber matrix help disperse bending strain and stress. Additionally, these nanoparticles created numerous hydrophilic sites on the CNFM surface, significantly enhancing capillary action for water—resulting in remarkable superhydrophilicity (water contact angle = 0°) and underwater superoleophobicity (oil contact angle > 155°), regardless of water conditions (acidic, alkaline, or saline). Consequently, the obtained CNFM effectively separated various oil-in-water emulsions solely under the force of gravity, and could be easily regenerated. This work offers a promising solution for designing next-generation membranes for oily wastewater treatment in complex environments.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Wei Guo,Xiaoyan Zhang,Ke Wang,Xueyi Zou,Guoshen Zeng,Jiapeng Zhong,FengHui Tian,Chuanhao Li
The Heterogeneous Fenton reaction has long stood out as a highly effective technology for water purification. However, it is nowadays facing challenges such as low selectivity, sluggish Fe(III) reduction, and limited H 2 O 2 conversion efficiency. Herein, dehydrated MIL-100(Fe)-250 was synthesized through thermal treatment, demonstrating superior efficiency in removing emerging contaminants, with a three-fold efficiency higher than undehydrated sample. The dehydrated MIL-100(Fe)-250 exhibited selective acceleration in the removal of quinolones and phenolic organics, rendering the system resistant to interference from coexisting matter. Through in-situ diffuse reflectance infrared Fourier-transform spectroscopy and density functional theory calculation, it was manifested that dehydration process regulates the steric hindrance and local electron density of Fe ions. This adjustment enhances charge transfer, thereby facilitating Fe(III) reduction and promoting the H 2 O 2 activation and conversion efficiency. Moreover, the quasi-steady-state concentrations of hydroxyl radical in MIL-100(Fe)-250 were found to be 2.2 times higher than that those in undehydrated sample. Impressively, the dehydrated MIL-100(Fe)-250 displayed adaptability across a broad pH range of 5.0–9.0. The present study underscores the significant potential of porous MIL-100(Fe)-250 with spatial confinement, which imparts a clear size exclusion effect. As a result, this catalyst emerges as a promising candidate for eliminating contaminants in real water matrices, offering a viable strategy for water pollution control.
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CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Qingyang Dai,Kecheng Zhu,Yongliang Xu,Yixuan Liu,Yuanren Jiang,Chenghe Yan,Chi Zhang,Hanzhong Jia
Ambiguous interpretations regarding the underlying mechanism of molecular oxygen (O 2 ) activation by the carbonaceous material/reductant system, especially in terms of the catalytic active site, have impeded the optimization and broader application of the system in environmental remediation. Here, we thoroughly investigated the role of boron-doped biochar (BBC) active sites in O 2 activation and optimized the ascorbic acid (AA) dosing strategy to improve the hydroxyl radical (•OH) production rate and pollutant removal. The introduction of boron facilitated O 2 activation through the successive one-electron transfer to generate •OH that predominantly occurred and accumulated on BBC surface, where •OH yield was nearly 5-fold and 9-fold higher than that in N-doped biochar/AA and zero-valence iron (ZVI) system, respectively. This results in better degradation performance of BBC/AA system for organic pollutants absorbed on the BBC surface and robust resistance to commonly occurring water anions and negatively charged organic matter. Moreover, the stepwise addition of low-concentration AA (0.5 mM) promoted the BPA removal (over 90 %) by maximizing the effective availability of AA and •OH. Characterization, galvanic oxidation process, and theory calculation results revealed that BC 2 O acted as the primary electron-accepting group to receive the electrons from AA, while BC 3 acted as both an electron-donating group and an O 2 adsorption site on BBC, which together facilitated O 2 activation and •OH production on the BBC surface. These findings provide a comprehensive understanding of O 2 activation within the BBC/AA system, highlighting its potential as a sustainable and effective approach for advanced environmental remediation applications.
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CHEMICAL ENGINEERING JOURNAL
·
2012
·
IF 3.461
Ruixiong Huang,Zhanqiang Fang,Xiaomin Yan,Wen Cheng
In this study, the Fe 3 O 4 magnetic nanoparticles (MNPs) were synthesized as heterogeneous catalysts to effectively degrade bisphenol A (BPA). The properties of the synthesized catalysts were characterized by Brunnaer–Emmett–Teller (BET), X-ray powder diffraction (XRD), X-ray photoelectron spectrometry (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The results indicated that the Fe 3 O 4 MNPs appeared to be roughly spherical shapes and their average size was 10–20 nm. The catalytic capacity of MNPs in US + Fe 3 O 4 + H 2 O 2 system with different pH conditions, H 2 O 2 concentrations and MNPs doses was investigated. It was found that the OH radicals were promptly generated due to the catalysis of the Fe 3 O 4 MNPs. BPA could be degraded within a wide pH range from 3 to 9, and the degradation efficiencies were remarkably enhanced by ultrasound. The apparent rate constants were 8.31 × 10 −3 , 7.96 × 10 −3 and 5.64 × 10 −3 min −1 , respectively, when the pH values were 3, 7 and 9, respectively. The removal efficiencies of BPA were all over 95%. About half total organic carbon (TOC) in solution was eliminated under neutral condition by sono-Fenton process. Furthermore, the results of stability and reusability demonstrated that the Fe 3 O 4 MNPS were promising in the treatment of wastewater with refractory organics.
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高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
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2012
·
IF 0.606
Jinyu Chu,Bing Wang,Yujun Song,Xiaohua Zou,Chunxiang Li,Yongsheng Yan
A highly selective imprinted amino-functionalized Fe3O4@SiO2 sorbent was prepared by surface molecular imprinting technique for selective removal of trace 2,4-dichlorophenol (2,4-DCP) in water samples. The 2,4-DCP-imprinted amino-functionalized Fe3O4@SiO2 sorbent was characterized by Fourier transform infrared, transmission electron microscopy, vibrating sample magnetometer, thermogravimetric analysis and batch-mode binding studies. The imprinted functionalized Fe3O4@SiO2 sorbent exhibited high selectivity and offered a fast kinetics for the adsorption of 2,4-DCP. The prepared sorbent was shown to be promising for selective removal of trace levels of 2,4-DCP in environmental water samples.
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
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IF 6.3
Bo Xu,Meng Jia,Dong Wang,Siheng Zhao,Shouao Zhu,Lijun Qian
Four polyphosphate/polyphosphonate flame retardants (PAP, POP, PAP-UB and POP-UB) have been designed and synthesized to study the effects of phosphorus valence states and the presence of unsaturated carbon-carbon double bonds on self-cross-linking impacting flame-retardant modes of action. It was found that phosphorus valence states affect the proportion of flame-retardant activity between the gas phase and condensed phase. A phosphonate containing +3-valence phosphorus is primarily effective as a gas-phase flame-retardant, while the one containing +5-valence phosphorus mainly exerted an impact in the condensed phase. The introduction of an unsaturated bond enhances the carbon-forming effect promoted by polyphosphates/polyphosphonates in a degrading polymer matrix and increases the melt viscosity for blends at high temperature. The phosphorus-containing fragments which might have been released into the gas phase are locked in the condensed phase due to C C bonds cross-linking, thus forming more high-quality phosphorus-rich char layers. This effect balances the distribution of gas-phase and condense-phase flame-retardant effects and is especially obvious in PET/polyphosphonate blends containing +3-valence phosphorus, which originally plays mainly the role of a gas-phase flame retardant . PET blends containing unsaturated carbon-carbon double bonds display better carbon formation, flame-retardant activity and anti-dripping behavior than these do without this feature.
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高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Ningning Zhou,Huihui Zheng,Mengen Hu,Rui Liu,Guangchao Qin,Yilin Lu,Haibin Tang,Zhulin Huang
In this study, highly uniform 3D Al nanoneedle arrays (AlNNAs) decorated with Ag nanopines are synthesized by anodization of Al foil with prior nanoimprinting and subsequent electrodeposition method, demonstrating remarkable surface-enhanced Raman scattering (SERS) property. The AlNNAs possess a highly ordered periodicity of 1 μm and nanoneedle height of 800 nm, making it an optimal supporting matrix to host Ag-NPs as SERS substrate. Such well-ordered Ag@AlNNAs SERS substrate with precisely electrodeposited Ag nanopines generate high density SERS host spots and abundant sites to adsorb target molecules. As a result, Ag@AlNNAs exhibit high sensitivity for rhodamine 6 G down to 10 –13 M and good signal reproducibility with a relative standard deviation of 7.2 %, as well as an average enhancement factor of 4.23 × 10 9 . For practical detection of pollutants, 10 –8 M adenine , 10 –12 M bisphenol in water, and melamine (10 –7 M) in opaque milk are clearly identified by using the Ag@AlNNAs sensor. This study opens a bright way to fabricate SERS substrate with a good balance of sensitivity, reproducibility and cost, indicating promising potential for environmental monitoring and food safety.
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