ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 17
·51303-51313
·
IF 5.8
Lu Hongyu,Gao Wei,Deng Chengxun,Liu Xiaowei,Li Weiping,Yu Zhimin,Ding Haitao,Zhang Ling
Single degradation systems based on dielectric barrier discharge plasma (DBDP) or persulfate (PS) oxidation cannot achieve the desired goals (high degradation efficiency, high mineralization rate, and low product toxicity) of degrading atrazine (ATZ) in river sediment. In this study, DBDP was combined with a PS oxidation system (DBDP/PS synergistic system) to degrade ATZ in river sediment. A Box–Behnken design (BBD) including five factors (discharge voltage, air flow, initial concentration, oxidizer dose, and activator dose) and three levels (− 1, 0, and 1) was established to test a mathematical model by response surface methodology (RSM). The results confirmed that the degradation efficiency of ATZ in river sediment was 96.5% in the DBDP/PS synergistic system after 10 min of degradation. The experimental total organic carbon (TOC) removal efficiency results indicated that 85.3% of ATZ is mineralized into CO 2 , H 2 O, and NH 4 + , which effectively reduces the possible biological toxicity of the intermediate products. Active species (sulfate (SO 4 • − ), hydroxy (•OH), and superoxide (•O 2 − ) radicals) were found to exert positive effects in the DBDP/PS synergistic system and illustrated the degradation mechanism of ATZ. The ATZ degradation pathway, composed of 7 main intermediates, was clarified by Fourier transform infrared spectroscopy (FTIR) and gas chromatography-mass spectrometry (GC–MS). This study indicates that the DBDP/PS synergistic system is a highly efficient, environmentally friendly, novel method for the remediation of river sediment containing ATZ pollution.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Weiying Li,Li Liang,Yue Li,Yu Tian,Jiping Chen,Sheng Chen,Junpeng Zhang
Recently, EDTA-chelated Cd II (Cd II -EDTA) was effectively removed by sulfidated nanoscale zero-valent iron (S-nZVI). However, few studies have been performed to investigate the influence of co-existing ions and emerging contaminants (such as microplastics) on the performance of S-nZVI toward Cd II -EDTA, which is vital for the application of S-nZVI in practical wastewater treatment. In this study, the individual effects of different co-existing ions (NO 3 − , SO 4 2− , PO 4 3− , Mg 2+ , Cu 2+ , and Zn 2+ ) and polystyrene (PS) microplastics with different concentrations on the removal of Cd II -EDTA by S-nZVI were systematically investigated. The removal capacity of S-nZVI toward Cd II -EDTA fell in the range of 579.3–644.7, 612.3–670.2, 607.4–691.3, 533.3–623.6, 79.9–545.3, 544.3–631.7, and 568.6–663.8 mg/g for the presence of NO 3 − , SO 4 2− , PO 4 3− , Mg 2+ , Cu 2+ , Zn 2+ , and PS microplastics over the concentration range of 10.0–150.0 mg/L, respectively, which were all smaller than that of the system of Cd II -EDTA alone (746.6 mg/g), indicating that all of the investigated co-existing substances showed inhibitory effects on Cd II -EDTA removal. As for NO 3 − , SO 4 2− , or Mg 2+ -containing system, the inhibitory effect was ascribed to the influence of S-nZVI corrosion rate; As for PO 4 3− , Mg 2+ , Cu 2+ , Zn 2+ , or PS microplastics-containing system, the negative effect was caused by changing the corrosion of S-nZVI and occupying the reactive sites at the surface of S-nZVI. The final corrosion products of S-nZVI under different reaction conditions were strongly dependent on the species and concentration of co-existing substance with the combinations of γ-FeOOH, α-Fe 2 O 3 , FeO, or β-FeOOH as the dominant corrosion products.
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2020
·Vol. 305
·期 4
·1900835
·
IF 3.853
Yi Yang,Ling-yan Li,Bo Yin,Ming-bo Yang
Conductive composites based on polymers and conductive nanofillers are widely studied as a promising material. The rational design of 3D conductive networks in composites is crucial to improve their electrical conductivity and reduce the dosage of nanofillers. Herein, poly(vinylidene fluoride) (PVDF) and polystyrene (PS) bi-continuous structures with modified carbon nanotubes (CNTs) tailored to anchor at the interface are designed to achieve an ultralow electrical percolation threshold because of the formation of a thin interfacial conductive layer. In this work, the modification of CNTs with poly(methyl methacrylate) (PMMA), which contributes to the improvement of the compatibility between PVDF and CNTs, is effective to control the distribution of CNTs in composites. It promotes the migration of CNTs from the PS phase to the interface of PVDF and PS. Consequently, the interfacial conductive layer is formed at a low CNT content, and the electrical percolation threshold of PVDF/PS/CNTs-PMMA nanocomposites is only 0.07 vol%, having a great decrease of about 50% compared with that of PVDF/PS/CNTs nanocomposites. Thus, it is demonstrated that the distribution of CNTs can be tailored to anchor at the interface by proper chemical modification to form an interfacial conductive layer and a decrease of percolation threshold can also be achieved.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Wenhai Chu,Dongmei Li,Yang Deng,Naiyun Gao,Yansen Zhang,Yanping Zhu
Free amino acids (AAs) can form trihalomethanes (THMs) and haloacetonitriles (HANs) during chlorination in drinking water treatment plants, but they account for a small fraction of dissolved organic nitrogen (DON) pool in natural waters. In contrast, combined AAs contribute to a greater identifiable DON portion, but the information on the formation and control of THMs and HANs from them is limited. Ultraviolet/hydrogen peroxide (UV/H 2 O 2 ) and ultraviolet/persulfate (UV/PS), two typical UV-based advanced oxidation processes (UV-AOPs), are both promising drinking water technologies for the reduction of trace organic contaminants . The objective of this study is to examine the effects of the two UV-AOP pre-treatments on the formation of carbonaceous and nitrogenous disinfection by-products (C- and N-DBPs), which were indicated by THMs and HANs, respectively, during post-chlorination and chloramination of tyrosine (Tyr) in free and combined forms. Results showed that direct UV photolysis, PS pre-oxidation alone or H 2 O 2 pre-oxidation alone did not significantly impact the THM and HAN formation during subsequent chlorination. However, the two UV-AOP pre-treatments could somewhat alter the DBP formation. In general, under the identical doses (UV irradiation dose and molar oxidant dose), UV/PS pre-treatment better controlled the HANs than UV/H 2 O 2 during AA post-chlorination, though UV/PS might slightly promote the formation of chloroform . In contrast, the two UV-AOP pre-treatments did not obviously affect the THM and HAN formation when post-chloramination was applied. In addition, a marked difference was observed in the speciation of DBPs formed from free AAs and short oligopeptides in the presence of bromide. For free Tyr, more brominated THMs were formed than brominated HANs; but for short oligopeptides, more bromine was incorporated into HANs than THMs.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yansheng Liu,Zhenle Qin,Guofu Wang,Xiaobo Jia,Jin Zhou,Hongqi Li,Zhaoxu Li,Xiaohui Fang
Nanoplastic particles (NPPs) have attracted lots of attention due to their toxicity. In this study, a Surface-enhanced Raman scattering (SERS)-based category on selectivity and quantification detecting the polystyrene (PS) NPPs has been presented. Firstly, the size-dependent SERS relationship between the diameter of Ag nanocavities (AgNCAs) and the diameter of the PS NPPs is studied. By continuously dripping the PS NPPs on proposed AgNCAs substrates, AgNCAs exhibit excellent enrichment capability with a promoted limit of detection (LOD) of 0.001 mg/mL. Secondly, thermally evaporated Ag nanoparticles (AgNPs) as an enhancement layer are used to form the AgNPs/PS NPPs/AgNCAs sandwich structure with a SERS enhancement of 300 %. Thirdly, a SERS microfluidic chip constructed by integrating two kinds of pore size (87 nm and 356 nm) AgNCAs is fabricated to selectivity quantifying absolute concentration of the mixed PS NPPs with different diameters in a mixed solution. It shows excellent performance. This novel category proves a good method for identifying plastic nanoparticles and analyzing their size distribution existing in the surroundings indicating good practical applications.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Xinle Han,Jing Xu,Yanfeng Shi,Lixingzi Wu,Ling Fu,Weina Xue,Yanhao Zhang,Xu Zhang,Xuli Jing,Zhibin Zhang
Microplastics and PFOA are emerging contaminants that are widely present in groundwater, posing threats to human health and ecosystems. This study aimed to investigate the remediation of polystyrene microplastics (PS-MPs) and perfluorooctanoic acid (PFOA) in groundwater using waste coconut shell biochar in permeable reactive barriers (PRBs). Fixed-bed column experiments were conducted with different bed depths, flow rates, initial pollutant concentrations, and co-contamination conditions. Results demonstrated that coconut shell biochar exhibited an effective adsorption capacity, with an initial concentration of 1 mg/L, flow rate of 0.5 mL/min, and bed depth of 2.5 mm, removal efficiencies of 75.00 % for PFOA and 36.24 % for PS-MPs were achieved within 10 days. Increasing the depth of biochar from 1.5 mm to 5.0 mm enhanced the removal efficiencies (PFOA:96.43 %, PS-MPs:61.72 %) and extended breakthrough times (480 min for PS-MPs, 2410 min for PFOA). Lower flow rates (0.2 mL/min) extended hydraulic retention time, improving adsorption (both PFOA and PS-MPs were > 75 %), while higher pollutant concentrations accelerate PRB depletion and reduce removal efficiency. Additionally, the presence of PS-MPs exhibited dual effects on PFOA remediation: promoting adsorption at low concentrations but causing competitive inhibition at high concentrations. Meanwhile, increasing PFOA concentrations intensified electrostatic repulsion, which reduced the removal efficiency of PS-MPs from 36.24 % to 10.43 % as the PFOA concentration increased from 0 to 10 mg/L. Furthermore, among the tested models (Thomas, Yoon-Nelson and BDST), the Thomas model best fitted the fixed-bed adsorption data for PS-MPs, PFOA, and composite contamination.
研究领域:
环境科学
·
水处理技术
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吸附工程
·
新兴污染物修复
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JOURNAL OF SUPERCRITICAL FLUIDS
·
2022
·
IF 4.514
Qianrui Xu,Pengcheng Gao,Yang Wang,Wenjie Jiang,Zhifei Wang,Yong Jiang,Zhen Jiao
Porous nanospheres have potential applications in reactions, catalysis and water treatment because of their high surface area, low density and high loading capacity. In this work, a reproducible and well-controlled way to fabricate hollow Polystyrene/Poly(divinylbenzene-co-methacrylic acid)@Fe 3 O 4 /Tannic acid@Ag (PS/P(DVB-co-MAA)@Fe 3 O 4 /TA@Ag) nanocomposites with high catalytic efficiency is developed. Firstly, hollow Polystyrene/Poly(divinylbenzene-co-methacrylic acid) (PS/P(DVB-co-MAA)) nanospheres with an open hole on the surface are produced by supercritical carbon dioxide (scCO 2 ) rapid depressurization methodology. The consequence shows that structure of polymer nanospheres is controllable by altering the reactive conditions, like temperature, pressure, solvent ratio, degree of cross-linking and time. Secondly, the magnetic Fe 3 O 4 and Ag nanoparticles are deposited onto the surface of hollow PS/P(DVB-co-MAA) nanospheres. The result indicates that hollow PS/P(DVB-co-MAA)@Fe 3 O 4 /TA@Ag nanocomposites are highly efficient in degrading dyes, displaying that the apparent rate coefficients of methylene blue (MB), rhodamine B (RhB) and 4-nitrophenol (4-NP) reduction are .0090 s −1 , 0.0239 s −1 , and 0.0073 s −1 , respectively. Besides, hollow PS/P(DVB-co-MAA)@Fe 3 O 4 /TA@Ag nanocomposites can be recycled at least seven times and show no significant loss in catalytic performance.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ke Zhu,Qiong Bin,Yaqian Shen,Jin Huang,Dongdong He,Wenjin Chen
In this study, N-doped bamboo-like carbon nanotubes encapsulated with Fe nanoparticles (Fe NPs) on the surface of soybean dregs-derived biochar (Fe@NCNT − BC) was synthesized via a low-cost and facile strategy. The unique composites behaved as efficient catalysts for the degradation of various organic pollutants by the activation of persulfate (PS). Under the conditions of [PS] = 5 mM, [RhB] = 20 mg/L, [Fe@NCNT-BC-800] = 1.0 g/L, pH = 7.0, the RhB degradation rate was very fast reaching up to 100% within 10 min. The system also exhibited significant high activity in a broad pH window (3.0–11.0). Meanwhile, the recycling experiments and Fe leaching tests further demonstrated the stability of Fe@NCNT − BC during the activation of PS. Most interestingly, the Fe nanoparticles played a key role in promoting the degree of graphitization and the formation of bamboo-like N-doped carbon nanotubes. Besides, the introduction of biochar significantly improved the dispersion ability to the Fe@NCNT − BC. The competitive radical quenching tests and electron paramagnetic resonance measurements (ESR) illustrated that instead of the traditional radicals (sulfate radicals and hydroxyl radicals), the non-radical singlet oxygen ( 1 O 2 ) was the dominant reactive oxidative species (ROS) in the Fe@NCNT-BC/PS system. A mechanistic study suggested that pyridinic N, graphitic N, sp 2 -hybridized carbon structure and C = O bond in the Fe@NCNT − BC − 800 promoted the generation of the ROS. This study successfully provides an economic and feasible method for synthesis of a novel catalyst as an eco-friendly and efficient material for the degradation of organic pollutants in the environment.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yue Li,Yayue Zhang,Xuran Ding,Taotao Zou,Hu Li,Ke Xu,Cheng Su,Yuting Wang,Ziming Zhao,Yuan He
Effective delivery of drugs to the inflamed colon is an attractive strategy for treating inflammatory bowel disease (IBD). Here we designed a drug delivery platform for IBD treatment by hybridizing platelet membrane (PM) with phosphatidylserine (PS)-containing liposomes (PM-Lipo). Introducing PM into hybrid nanovesicles enhanced their adhesion to the inflammatory endothelium in vitro , and increased their recruitment to the inflamed colon in a mouse IBD model. Meanwhile, adding PS into PM-Lipo improved macrophage targeting and uptake in vitro and in vivo . Rosiglitazone (ROSI) loading PM-Lipo (PM-Lipo-ROSI) effectively reprogrammed the pro-inflammatory macrophages towards an anti-inflammatory status in the inflamed colon, reducing pro-inflammatory cytokine secretion and immune cell infiltration. Moreover, PM-Lipo-ROSI also promoted the epithelial barrier regeneration of the damaged colon. The present study not only provides a novel paradigm for the precision treatment of IBD, but also lays a theoretical foundation for developing nanomedicines for other inflammatory diseases.
研究领域:
纳米医学
·
药物递送系统
·
炎症性疾病
·
生物医学工程
·
免疫治疗
·
胃肠病学
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 38
·21867-21876
·
IF 12.732
Zhaoxia Cao,Jian Guo,Shengnan Chen,Zhennan Zhang,Zhenpu Shi,Yanhong Yin,Mingguo Yang,Xiaoxu Wang,Shuting Yang
Lithium–sulfur (Li–S) batteries are one of the most promising next-generation energy storage systems. Nevertheless, the notorious lithium polysulfide (LiPS) shuttle and sluggish sulfur redox kinetics result in inferior electrochemical performances, which are the major obstacles to their commercial application. Engineering the surface/interface of the ultrafine polysulfide promotor which can accelerate LiPS conversion and improve sulfur utilization is still challenging. Herein, we propose an effective strategy to synthesize ultrafine heterostructural Nb2O5–NbC homogeneously distributed in a carbon nanofiber matrix. Polystyrene (PS), as the nanocrystallite growth modulator, plays a vital role in suppressing particle agglomeration. The in situ formed heterostructures with a rational interface engineering design can achieve effective LiPS regulation and speed up the redox kinetics, as confirmed by the density functional theory (DFT) calculations and experimental characterizations. As expected, the battery containing ultrafine Nb2O5–NbC heterostructures delivers long-term cyclability with a low capacity decay of 0.044% per cycle over 800 cycles at 1.0C. And the decay rate is as low as 0.045% after 250 cycles at 0.5C with a sulfur loading of 4.0 mg cm−2. This work provides a rational way to prepare ultrafine heterostructural polysulfide promotors via engineering the interface design for Li–S batteries.
研究领域:
能量存储系统
·
材料科学
·
电化学
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高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-14
·
IF 14.7
Su Han,Zhong Yu,Wang Changhong,Liu Yu,Hu Yang,Li Jingru,Wang Minkang,Jiao Longan,Zhou Ningning,Xiao Bing,Wang Xiuli,Sun Xueliang,Tu Jiangping
Sulfide electrolytes represent a crucial category of superionic conductors for all-solid-state lithium metal batteries. Among sulfide electrolytes, glassy sulfide is highly promising due to its long-range disorder and grain-boundary-free nature. However, the lack of comprehension regarding glass formation chemistry has hindered their progress. Herein, we propose interstitial volume as the decisive factor influencing halogen dopant solubility within a glass matrix. We engineer a Li 3 PS 4 -Li 4 SiS 4 complex structure within the sulfide glassy network to facilitate the release of interstitial volume. Consequently, we increase the dissolution capacity of LiI to 40 mol% in 75Li 2 S-25P 2 S 5 glass. The synthesized glass exhibits one of the highest ionic conductivities among reported glass sulfides. Furthermore, we develop a glassy/crystalline composite electrolyte to mitigate the shortcomings of argyrodite-type sulfides by utilizing our synthesized glass as the filler. The composite electrolytes effectively mitigate Li intrusion. This work unveils a protocol for the dissolution of halogen dopants in glass electrolytes.
研究领域:
材料科学
·
电化学
·
电池技术
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Shiyu Zuo,Dongya Li,Haiming Xu,Dongsheng Xia
The Advanced Oxidation Processes (AOPs) still require further research in response to ever-increasing standard of reclaimed water reuse and operating environment requirements. In this study, an efficient microwave-ultraviolet catalyzed oxidation system (MW-UV) was successfully developed, and its degradation effect was studied by using activated H 2 O 2 , sodium percarbonate (SPC), persulfate (PS), and peroxymonosulfate (PMS) to degrade toxic organic contaminants in wastewater and actual industrial wastewater. It was shown that MW-UV had an exceptionally high capability to react with these four common peroxides to produce reactive radicals ( OH and SO 4 − ). This can destroy multiple toxic organic contaminants through nonselective oxidation with a wide range of pH applications, has strong adaptability to anions in bodies of water, and can effectively treat wastewater. The sequence of predominant free radical generation rate by MW-UV was SPC > H 2 O 2 > PS > PMS, with higher generation rate constant than other Fenton processes. The free radical evolution mechanisms for H 2 O 2 , SPC, PS, and PMS activation were also investigated. The thermal and non-thermal effects of microwave irradiation have a significant enhancement for UV reactions, and thus the synergy between the MW and UV can effectively activate peroxide. This treatment method could provide scientific basis and reference for degrading toxic organic contaminants in small-scale and limited space wastewater treatment.
研究领域:
环境工程
·
化学工程
·
水处理
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