WATER AIR AND SOIL POLLUTION
·
2026
·Vol. 237
·期 14
·791
·
IF 3.5
Yu Lian,Lu Jiarui,Yu Meng,Duan Yajing,Zhang Baofeng,Zhang Xuan,Wang Xiaoyue,Liang Cunzhen
Cu(I) doped Fe 3 O 4 nanoparticles was loaded onto graphene oxide, Cu-Fe 3 O 4 /GO with binary active sites and accelerated Fe(III)/Fe(II) cycle showed higher tetracycline hydrochloride oxidation efficiency than Fe 3 O 4 and Cu-Fe 3 O 4 , the influences of initial H 2 O 2 concentration, reaction pH, catalyst dosage, reaction temperature and radical scavengers on catalytic performance of Cu-Fe 3 O 4 /GO were investigated. The heterogeneous Fenton reaction over Cu-Fe 3 O 4 /GO surface contained Fe(III)/Fe(II) and Cu(II)/Cu(I) active sites, Fe species were the dominant active centers. Cu-Fe 3 O 4 nanoparticles and GO combined via C–O–Fe bond and formed a stable Cu-Fe 3 O 4 /GO conductive structure, which promoted electrons transfer between Cu-Fe 3 O 4 and H 2 O 2 , thus accelerating Fe(III)/Fe(II) and Cu(II)/Cu(I) cycles. GO significantly improved specific surface area, Cu-Fe 3 O 4 nanoparticles dispersibility, and adsorption performance of catalyst. Furthermore, the strong interaction between GO and Cu-Fe 3 O 4 prevented ions from leach, GO captured the soluble Fe(III) which was efficiently reduced to Fe(II) surf by surrounding H 2 O 2 and Cu(I) surf . The degradation efficiency maintained 80.7% after six cycles, the excellent stability can be ascribed to the strong interaction between Cu-Fe 3 O 4 and GO. Reactive oxygen species scavenging results indicated that surface-bound • OH surf played a dominating role, followed by aqueous • OH aq and superoxide radicals (O 2 •− ).
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ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Li Zhao,Xianzhi Hu,Futing Zi,Shuliang Chen,Huiling Cheng,Peng Yang,Yan Zhang,Yunlong Chen,Yunshu Jiang,Xinrong Li,Yue Lin,Zhujuan Li,Juan Li,Haiwen Wang,Yufang Li
It is desirable to develop a highly stable, cost-effective, and recyclable adsorbent to adsorb Au(I) from thiosulfate solutions. In this study, reliable aminated microspheres (PS–TETA) were synthesized via a one-pot method that profited from active chloromethyl group-induced nucleophilic substitution between chloromethylated polystyrene (PS–Cl) and triethylenetetramine (TETA). These microspheres were used to recover a gold(I) thiosulfate complex. Scanning electron microscopy, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller technique, and X-ray photoelectron spectroscopy were adopted to analyze the surface elements and structure of PS–TETA. Additionally, influencing parameters, such as pH, thiosulfate concentration, and temperature, were investigated. The results indicated that the synthetic process and gold-adsorption behavior of PS–TETA was directly related to the surface chlorine and amine groups. The adsorption process was exothermic and consistent with the Freundlich isotherm model and pseudo-second-order kinetics. Complete adsorption of Au(I) was achieved with a maximum capacity of 23.79 kg t–1. Na2SO3 proved to be an effective desorbent and exhibited a satisfactory adsorption ability of the adsorbent even after five cycles. Anion exchange as a reasonable Au(S2O3)23– adsorption mechanism of PS–TETA is proposed. This study offers a practical method for synthesizing aminated microspheres with excellent properties to recover Au(I) from thiosulfate solutions.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 5
·950-958
·
IF 7.779
Shifei Kang,Zhihao Zhang,Maofen He,Zirou Fang,Di Sun,Lulu Zheng,Xijiang Chang,Lifeng Cui
Co-modification of graphitic carbon nitride (g-C3N4) photocatalysts can maximally optimize their intrinsic photoelectric structures, but usually involves complex multistep reactions, and thus is challenging because structural collapse and active site decay usually happen due to the complex process, over-treatment or conflict of different modification strategies. In this work, potassium iodate (KIO3), an edible salt additive, was used as a critical waste-free modifier in the thermal polymerization of g-C3N4, leading to a fast and coordinated co-modification of g-C3N4 photocatalysts. The final g-CN-KIO3 photocatalyst demonstrated a superior and balanced optical absorption ability and semiconductor band structure. In visible-light-driven photocatalytic model tests, g-CN-KIO3 showed a 3.25 times higher Cr(VI) photoreduction rate and five orders of magnitude lower residual bacteria in a photocatalytic sterilization within 120 min compared with raw g-C3N4. The photocatalytic performance of g-CN-KIO3 also outperformed all of the controls without maximized K–I–O co-modification (CN-K, CN-I, CN-O, and CN-KI). Photocurrent and electrochemical impedance experiments suggest that the co-modified photocatalysts have a faster charge separation ability, which is attributed to the multiple K–I–O co-modifications inducing an optimized surface electronic structure and slower carrier recombination. This work provides a new way to simplify and coordinate complex multi-factor regulation of materials.
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ENVIRONMENTAL ENGINEERING SCIENCE
·
2022
·Vol. 39
·期 3
·259-267
·
IF 2.172
Yue Sun,Lijiang Tian,Bingkun Liu,Fulong Chen,Sijie Ge
In this article, Mn/I-TiO2 nanocatalyst was prepared by sol-gel method and used as the photocatalyst to discompose the gaseous benzene in the visible light. The crystal phase composition and grain size of the photocatalyst were investigated by X-ray diffraction and Raman, respectively. X-ray photoelectron spectroscopy and ultraviolet-visible diffuse reflectance spectroscope were used to study the surface elements and bandgap width of the photocatalyst. The research findings suggested that the crystal type of all catalysts was anatase. TiO2 nanoparticle doped by Mn/I could reduce its crystallite size and augment lattice distortion because of the formation of oxygen vacancies. The generation rate, migration rate, and disintegration rate of electron-hole pairs were increased by modification of TiO2. Meanwhile, the Mn-TiO2 was recognized with the smallest bandgap among four kinds of catalyst. Mn-TiO2 catalyst exhibited the highest efficiency on gaseous benzene removal (37.86%) among pure-TiO2 (3.33%), I-TiO2 (30.21%), and Mn-I-TiO2 (31.56%) under visible light. Correspondingly, the photocatalytic ability of pure-TiO2, I-TiO2, Mn-I-TiO2, and Mn-TiO2 was 51.25 μg C6H6/(g·h), 424.36 μg C6H6/(g·h), 493.61 μg C6H6/(g·h), and 245.43 μg C6H6/(g·h), respectively.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Haoran Song,Shiting Pan,Yuwei Wang,Yang Cai,Wei Zhang,Yongming Shen,Changping Li
There exists an obvious contradiction between Cu(III) generation and Cu(I) contribution in reductants enhanced Cu(II)/peroxymonosulfate (PMS) process because the involved electron transfer pathways were always ignored in previous studies. This study investigated the MXene-mediated electron transfer mechanism in Cu(II)/PMS for the first time. The introduction of MXene significantly promoted atrazine degradation under acidic condition because the in-situ generation of Cu(I) was an excellent activator for PMS. Under alkaline condition, although addition of MXene generated a large amount of Cu(I), the degradation of atrazine was inhibited due to that the conversion of Cu(I) to Cu(III) was interrupted. The strong metal-support interaction (SMSI) altered the reactive intermediate species from Cu(III) (two-electron transfer) to hydroxyl radical (HO • ) and sulfate radical (SO 4 •- ) (one-electron transfer) under alkaline condition. This work proposed a novel MXene-mediated electron transfer mechanism and improved the understanding of Cu(III)/Cu(I) transformation pathway.
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Journal of Physical Chemistry C
·
2022
·
IF 4.177
Shuoshuo Zang,Guoqing Xu,Renci Yang,Qinyi Zhu,Hewen Liu
It is still challenging to achieve both good stability and high PLQYs for perovskite NCs because of their ionic nature and structural defects. In this work, tungstosilicic acid (TSA) is used for the surface passivation of cesium lead halide perovskite NCs. Near-unity PLQY is achieved for CsPbBr3 NCs after surface passivation with a suitable amount of TSA. XRD in conjunction with XPS analysis shows that TSA binds hydrophobic chains of OAm onto the surface of CsPbBr3 NCs. XPS results also demonstrate that TSA passivation can change the charge distribution of the cations on the surface layers, which can enhance the interaction with surface traps. PL decay analysis reveals that trap states arising from the surface defects are significantly decreased after TSA passivation. TSA-passivated CsPbBr3 NCs demonstrate long-term ambient stability and good resistances to polar solvents and maintain about 80% of their initial PL intensity after storage under ambient conditions for 50 days. It is further found that TSA passivation is able to improve the PLQYs of a broad spectrum of CsPbX3 (X = Cl, Br, I) NCs without hindering the tunability of the band gaps and PL colors of CsPbX3 NCs via anion exchange.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Huihuang Xiong,Yong Fan,Xuejin Mao,Lan Guo,Aiping Yan,Xian Guo,Yiqun Wan,Hao Wan
Recently, the natural compound of aristolochic acid I (AAI) has attracted wide attentions due to its strong nephrotoxicity and carcinogenicity. However, the extraction of AAI based on conventional molecularly imprinted polymers (MIPs) are tedious with extensive eluent, causing secondary pollution and poor regeneration. Herein, thermosensitive and magnetic MIPs (TMMIPs) were synthesized by a surface imprinting method, which achieved thermosensitive capture/release of AAI, along with rapid magnetic separation, significantly shortening the elution time and reducing organic-solvent consumption. TMMIPs with dual-stimuli responses exhibited superior affinity, selectivity, kinetics, and regeneration ability towards AAI. TMMIPs were applied to analyze AAI in Houttuynia cordata via dispersive solid-phase extraction (d-SPE) coupled with high performance liquid chromatography (HPLC), yielding satisfactory recoveries (79.03–99.67%) and relative standard deviations (≤5.78%). The limit of detection of AAI was as low as 26.67 µg/L. TMMIPs demonstrate great applicability for fast, selective and eco-friendly extraction of AAI in complicated matrices.
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PubMed
高影响因子
TOXICON
·
2021
·
IF 3.033
Xiong Zhang,Chen Feng,Yimao Li,Chenlin Su,Shuxin Zhao,Shengdi Su,Feng Yu,Ji LI
Aristolactam I (AL-I) is the main active ingredient in the Aristolochia plant species, which have been associated with severe nephrotoxicity. In order to investigate the mechanism of AL-I induced renal epithelial-mesenchymal transition (EMT), we established an AL-I induced EMT model in human proximal tubular epithelial cells (HK-2 cells). Biochemical analysis experiment including Morphological examination, 3-(4,5-dimethylthiazol-2-Yl)-2,5-diphenyltetrazolium bromide assay, and Western blot analysis were performed. The results showed that AL-I accumulates in the cytosol causing cytotoxicity and inhibition of proliferation in a concentration- and time-dependent manner. Morphological examination showed that with the increasing concentration of AL-I, the tendency of HK-2 cells transform form epithelial cell to fibroblast cells was stronger. In the Western blot analysis, the expression of α-Smooth muscle actin (α-SMA) and Transforming Growth Factor β1 (TGF-β1) were significantly up-regulated, the expression of E-cadherin was significantly down-regulated after administrating. The ratio of the expression of P-Smad2/3 and Smad2/3 was significantly up-regulated, suggested that TGF-β/Smad-dependent signaling pathway was activated in this process. With presence of TGF-β receptor inhibitor (LY364947), we found that the expressions of three EMT related proteins (E-cadherin, α-SMA and TGF-β1) were obviously reversed. In conclusion, we acknowledge that AL-I can induce renal EMT process in HK-2 cell, which is triggered by the activation of TGF-β/Smad-dependent signaling pathway.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Zhenxing Fang,Kuang Wu,Le Wang,Da Xu,Weiwei Wang,Yuhang Lin,Xiaohui Liu,Chun Sun
Mn doped two-dimensional (2D) layered perovskites , are becoming excellent candidates as red phosphor because of their high quantum yields (QY) and enhanced stability. However, these Mn doped 2D layered perovskites can only be excited by the near UV light , which largely limits the development of perovskites. Herein, blue-excitable Mn-doped PEA 2 (Pb/Mn)(Br/I) 4 PQDs are synthesized from anion exchange surface engineering strategy. After anion exchange, orange Mn 2+ emission from exciton-to-Mn energy transfer is acquired under the excitation of 450 nm. The PEA 2 (Pb/Mn)(Br/I) 4 compounds exhibit strong luminescence with photoluminescence (PL) QY of 52%, which is comparable to most of the reported red emitting phosphors. A prototype white light-emitting diode (WLED) with good optical performance was fabricated using commercial (Sr,Ba) 2 SiO 4 :Eu phosphor and as-prepared PEA 2 (Pb/Mn)(Br/I) 4 as green and orange color converters, showing great potential in the applications of solid state lighting.
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Materials
·
2020
·Vol. 13
·期 18
·4026
·
IF 3.057
Shasha Zhang,Wenxin Ji,Ning Feng,Liping Lan,Yuanyuan Li,Yulong Ma
In this study, a Rh(I)/Ru(III) catalyst with a bimetallic space structure was designed and synthesized. The interaction between the metals of the bimetallic catalyst and the structure of the bridged dimer can effectively reduce the steric hindrance effect and help speed up the reaction rate while ensuring the stability of the catalyst. X-ray photoelectron spectroscopy (XPS) results show that rhodium accepts electrons from chlorine, thereby increasing the electron-rich nature of rhodium and improving the catalytic activity. This promotes the nucleophilic reaction of the catalyst with methyl iodide and reduces the reaction energy barrier. The methanol carbonylation performance of the Rh/Ru catalyst was evaluated, and the results show that the conversion rate of methyl acetate and the yield of acetic acid are 96.0% under certain conditions. Furthermore, during the catalysis, no precipitate is formed and the amount of water is greatly reduced. It can be seen that the catalyst has good stability and activity.Keywords:carbonylation;acetic acid;bimetallic catalyst
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JOURNAL OF CONTROLLED RELEASE
·
2020
·
IF 7.727
Tao Sun,Guangping Zhang,Zhongyuan Guo,Qinjun Chen,Yujie Zhang,Yongchao Chu,Qin Guo,Chao Li,Wenxi Zhou,Yiwen Zhang,Peixin Liu,Hongyi Chen,Haijun Yu,Liping Jiang,Chen Jiang
Chelating Cu from tumors has been verified as an effective and promising strategy for cancer therapy through antiangiogenesis. However, systematic removal Cu by injecting with Cu chelators will result unavoidable side effects, since Cu is indispensable to the body. In this work, a micelle targeting to tumors' newborn vessels based on a polypeptide was developed to co-load DOX and Probe X, which can go through an “OFF-to-ON” procedure to report the Cu + -capture events in vivo in a real-time way by giving near infrared (NIR) fluorescence and photoacoustic signal. By co-delivering antiangiogenesis and chemotherapeutic reagents, the tumor can be significantly suppressed, meanwhile with a low systematic toxicity. Hopefully, this work can offer new insights in designing sophisticated antitumor strategy.
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Green Energy & Environment
·
2020
·
IF 6.395
Li Cui,Lijuan Wang,Ming Feng,Li Fang,Yanxia Guo,Fangqin Cheng
Lithium (Li) is an important energy metal in the 21st century. However, the selective recovery of Li is still a big challenge, especially from acidic solutions with multiple metal ions existence. Herein we report a new ion pair induced mechanism for selectively extracting Li + from acidic chloride solutions by tributyl phosphate (TBP). It is shown that the acidity and the chloride ions in the aqueous phase have great effects on the extraction of Li + . The FT-IR, UV-Vis and ESI-MS experiments provide solid evidence for the formation of ion-pair complex [Li(TBP) n (H 2 O) m ] + [FeCl 4 ] − (n = 1, 2, 3; m = 0, 1) in the organic phase, which brings about the effective and efficient extraction of Li + . This mechanism can overcome the Hofmeister bias and allow for the selective extraction of Li + from the extremely hydrophilic chlorides. It has also been proved that the loaded Li in TBP can be effectively stripped by concentrated HCl solution with a Li/Fe separation factor > 500. The understanding of the ion-pair transport mechanism is helpful for optimizing the recovery process or further advancing more efficient recovery techniques for Li from acidic liquor.
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