ENVIRONMENTAL ENGINEERING SCIENCE
·
2020
·Vol. 37
·期 7
·497-508
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IF 1.681
Shijie Sun,Hongyu Deng,Jinfeng Yang,Dongxu Zhou,Xing Wan,Fengxia Han
Dissolved organic matter can be a photosensitizer in photodegradation processes. It can produce hydroxyl radicals, singlet oxygen, and triplet-state dissolved organic matter, which promote pollutant degradation. This study investigated to what extent the triplet substances and other active substances can, under irradiation, stimulate peroxides to produce more reactive species (RS), which accelerate the degradation of pollutants. The photodegradation of butyl 4-hydroxybenzoate (BP) was studied in the presence of dissolved organic matter (DOM) and persulfate (PDS), peroxymonosulfate (PMS), or hydrogen peroxide (H2O2). The peroxides promoted the photodegradation in the order PDS > H2O2 > PMS. The degradation rates were peroxide > DOM-mediated peroxide > DOM. The interaction of DOM with peroxide produced more RS to promote the degradation. Chlorella vulgaris were used to evaluate the toxicity of the treated effluent and the ecological risk was found to be low. The findings explain the mechanism of the photodegradation of BP in the presence of dissolved organics and peroxides.
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APPLIED CATALYSIS A-GENERAL
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2020
·
IF 5.006
Jiyang Liu,Haojie Yu,Li Wang
The catalysis performance of noble metal nanoparticles always suffered from harsh aggregation during reaction hence promising supports that were able to restrict as well disperse the NPs were in great demand. Herein we reported a bottom-up synthesis of ultrathin two dimensional ferrocene based metal-organic framework (FMOF) nanosheets employing ZrCl 4 and 1,1′-ferrocene-dicarboxylic acid as metal nodes and organic ligands respectively. Employed as a stable and easy-contacted support, Au NPs were reduced and attached on the surface of FMOF nanosheets with average diameter of ca. 5 nm. The obtained Au/MOF composite was used in the reduction of 4-nitrophenol to 4-aminophenol, and rapid conversion of almost 100% could be achieved in 5 min with a maximum TOF of 10.9 × 10 −4 mol min −1 m 2 . Moreover, after 10 cycles of the reusability test, there was no obvious decline in catalytic performance with conversion of almost 100%, confirming the unprecedented stability of this Au-MOF composite.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Quan Gan,Huijie Hou,Sha Liang,Jingjing Qiu,Shuangyi Tao,Liang Yang,Wenbo Yu,Keke Xiao,Bingchuan Liu,Jingping Hu,Yanfei Wang,Jiakuan Yang
Fe-rich biochar with multivalent iron compounds (Fe 0 , Fe 0.95 C 0.05 , Fe 3 O 4 , and FeAl 2 O 4 ) pyrolyzed from sludge cake conditioned with Fenton's reagent and red mud was utilized as an efficient Fenton catalyst for the degradation of 4-chlorophenol (4-CP). Effects of pyrolysis temperature and sludge conditioner composition on the transformation of iron compounds were studied. Both homogeneous Fenton reaction initiated by Fe 2+ leached from both low-valent Fe 0 and Fe 0.95 C 0.05 , and heterogeneous Fenton reaction initiated by solid iron phases of Fe 3 O 4 and FeAl 2 O 4 were revealed to contribute to the degradation of 4-CP. The removal efficiency of 4-CP remained 100% after five successive degradation rounds. The homogeneous Fenton reaction mainly works in the first degradation round, and the heterogeneous Fenton reaction dominates in subsequent degradation rounds. The findings of this study suggest that sewage sludge derived Fe-rich biochar could be utilized as an efficient Fenton catalyst for recalcitrant organics degradation .
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 26
·11336-11341
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IF 3.288
Dongying Shi,Chao-Jie Cui,Chun-Xiao Sun,Jun-Ping Du,Chun-Sen Liu
A new [Co21(H2O)4(OH)12]30+ unit-incorporating polyoxotungstate, Na18[Co(H2O)6]2{[Na(H2O)4]2[Na(H2O)2]2[Co(H2O)3]2[Co21(H2O)4(OH)12](SiW10O37)6}·24H2O (denoted as Co25Si6W60), has been hydrothermally synthesized and fully characterized via elemental analyses, thermogravimetric analysis, bond valence sum (BVS) calculations, IR spectrum, UV-vis spectrum, diffuse reflectance spectrum, powder X-ray diffraction and single-crystal structural analysis. The most remarkable feature is that the gigantic [Co21(H2O)4(OH)12(SiW10O37)6]30− core in Co25Si6W60 is composed of a square-like [Co21(H2O)4(OH)12]30+ nanosheet encapsulated by six dilacunary Keggin [α-SiW10O37]10− moieties in a staggered fashion, resulting in a remarkable sandwich-type assembly. Furthermore, the unique Co25Si6W60-based biosensing system, as a simple, rapid, and highly sensitive electrochemical platform, offers an environmentally friendly route for detecting dichlorvos in the field of both food safety and environmental pollution.
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OPTICS AND LASER TECHNOLOGY
·
2020
·
IF 3.233
Gulgina Mamtmin,Nuerguli Kari,Renagul Abdurahman,Patima Nizamidin,Abliz Yimit
Optical waveguide (OWG) sensors are widely used in gas detection, and sensitive materials are the key factors affecting sensor performance. Herein, we report on a 5,10,15,20-tetrakis-(4-methoxyphenyl) porphyrin (TMP) deposited optical wave guide (OWG) sensor. The porphyrin solutions with different acidity were deposited on a K + -ion exchanged glass OWG surface by spin coating, to fabricate porphyrin film-coated OWG gas sensing devices. The effects of pH values of the porphyrin solution used to prepare the sensitive film on the sensing properties of these devices were investigated. The gas sensitive performances of these devices in response to analytes were compared. Among them, the sensing devices fabricated using original and acidic solutions of porphyrin exhibited significant responses to sulfide gases and ethanediamine, respectively. The sensing device prepared using an acidic solution has a good response to ethanediamine gas (response and recovery times of the sensor for 1 ppm of EDA (ΔI = 48) are 13 and 38 s, respectively). The RSD of the output light intensity is ±2.84, the signal to noise ratio (S/N) is 5.6. The device prepared using the original solution has an excellent response to sulfide gases (H 2 S, SO 2 ), and can detect low concentration levels (ppm) of sulfide gases. These sensing devices thus have the potential to be used in food quality testing and environmental monitoring.
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ENVIRONMENT INTERNATIONAL
·
2020
·
IF 7.577
Song Li,Jingchun Tang,Qinglong Liu,Xiaomei Liu,Bin Gao
Nano zero-valent iron (nZVI) and its composite materials have been extensively studied in the field of environmental remediation. However, the oxidation and agglomeration of nZVI limits the large-scale application of nZVI in environmental remediation. This study developed a two-step method to prepare stable carbon-coated nZVI (Fe 0 @C) which combined hydrothermal carbonization and carbothermal reduction methods and used glucose and iron oxide (Fe 3 O 4 ) as precursors. When the carbothermal reduction temperature was 700 °C and the elemental molar ratio of carbon to iron was 22:1, stable Fe 0 @C can be generated. The nZVI particles are encapsulated by mesoporous carbon and embedded in the carbon spheres. The unique structure of carbon coating not only inhibits the agglomeration of nZVI, but also makes nZVI stable in air for more than 120 days. Not only that, the as-synthesized Fe 0 @C exhibited high catalytic activity toward the degradation of 4-chlorophenol (4-CP) by activating persulfate. Different from conventional nZVI catalysts in generation of sulfate radicals, Fe 0 @C selectively induced hydroxyl radicals for 4-CP degradation. Moreover, Fe 0 @C has been shown to efficiently degrade 4-CP by using the dissolved oxygen in water to form hydroxyl radicals. This study not only provides a simple, green method for the preparation of stabilized nZVI, but also provides the possibility of large-scale application of nZVI in the field of environmental remediation.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Jie Hao,Fangxia Wu,Rong Tang,Yuanyuan Sun,Dehua Liu,Zhenqing Zhang
Oxidized starch (oxStarch) is a major derivative of starch. In present study, 4-acetamide-TEMPO system was firstly applied to prepare specifically oxidized starch, homogeneous 1,4-linked α-D-glucuronan. The impact of oxidant amount, 4-acetamide-TEMPO amount and reaction temperature on the properties of products were investigated. The product structures were characterized with 1 H NMR for degree of oxidation (DO), SEC-MALS for MW, MS for analysis of oxidized oligosaccharides , and in-source fragmented MS for analysis of oxidized polysaccharides . The results showed that the DO of oxStarches increased, but their MWs decreased with the raise of oxidant amount; higher 4-acetamide-TEMPO amount provided higher efficiency of specific oxidation of starch, in which the product has higher DO and MW; no significant difference have been observed between the oxStarches oxidized at 4 and 25 °C, but significant degradation was observed at 50 °C. In each product, having a MW distribution, the portion with smaller size has higher DO. While some unspecific oxidation was still observed observed on the second hydroxyl groups of sugar ring in the following order of priority, position 3 > 2 > 1 > 0.
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AIP Advances
·
2021
·Vol. 11
·期 7
·
IF 1.548
Lv Xiaogong,Zhu Chengjun,Yang Yanchun,Liu Ruijian,Fan Wenliang,Wang Yiming
In this work, Cu 2 ZnSnS 4 (CZTS) precursor films were deposited using a water-based solution approach. Subsequently, selenization was performed at different temperatures in the range of 480–610 °C to prepare Cu 2 ZnSn(S,Se) 4 (CZTSSe) absorber-layer films. The effects of the selenization temperature on the crystallinity, structure, morphology, and photoelectric properties of CZTSSe thin films, as well as the performance of solar cells constructed using these films, were systematically studied. The absorber-layer films selenized at different temperatures all formed pure-phase CZTSSe and had basically the same film thickness. It was found that application of an optimal selenization temperature can enhance the crystallinity, crystal grain size, and mobility and reduce the resistivity of CZTSSe films. Selenization at 550 °C resulted in the largest grain size (∼ μ m), the highest crystallinity, the highest mobility (4.29 cm 2 V −1 s −1 ), the lowest resistivity (3.13 × 10 2 Ω cm), the thinner fine-grained layer, a bandgap value of 1.21 eV, and a Cu-poor, Zn-rich elemental composition [Cu/(Zn + Sn) = 0.85 and Zn/Sn = 1.16]. The power-conversion efficiency was improved from 3.04% in a CZTSSe cell device with an absorber layer selenized at 480 °C to 4.69% in a film selenized at 550 °C. This was mainly due to the improvement of the crystallinity, crystal grain growth, and reduction of the fine-grained layer of the CZTSSe film. These results show that optimizing the selenization temperature is essential for enhancing the performance and the ultimate device efficiency of CZTSSe absorber layers prepared using a water-based solution approach.
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Oxidative Medicine and Cellular Longevity
·
2021
·
IF 6.543
Lijun Fang,Wei Wang,Jiazheng Chen,Anju Zuo,Hongmei Gao,Tao Yan,Pengqi Wang,Yujia Lu,Ruijuan Lv,Feng Xu,Yuguo Chen,Linmao Lyu
Idiopathic pulmonary fibrosis (IPF) is a chronic progressive lung disease characterized by the extensive accumulation of myofibroblasts and collagens. However, the exact mechanism that underlies this condition is unclear. Growing evidence suggests that NADPH oxidases (NOXs), especially NOX4-derived oxidative stress, play an important role in the development of lung fibrosis. Bleomycin (BLM) is a tumor chemotherapeutic agent, which has been widely employed to establish IPF animal models. Osthole (OST) is an active constituent of the fruit of Cnidium ninidium. Here, we used an in vivo mouse model and found that OST suppressed BLM-induced body weight loss, lung injury, pulmonary index increase, fibroblast differentiation, and pulmonary fibrosis. OST also significantly downregulated BLM-induced NOX4 expression and oxidative stress in the lungs. In vitro, OST could inhibit TGF-β1-induced Smad3 phosphorylation, differentiation, proliferation, collagen synthesis, NOX4 expression, and ROS generation in human lung fibroblasts in a concentration-dependent manner. Moreover, NOX4 overexpression could prevent the above effects of OST. We came to the conclusion that OST could significantly attenuate BLM-induced pulmonary fibrosis in mice, via the mechanism that involved downregulating TGF-β1/NOX4-mediated oxidative stress in lung fibroblasts.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Ting-Ting Li,Wen-Cheng Liu,Jiang Zhu,Yun-Huang Yang,Chao Ma,Chen Lu,Kun-Xiao Zhang
Green lacewing Chrysopa pallens (Rambur) is a general predator of many agricultural pests and plays a pivotal role in reducing crop damage by managing insect pest populations. Odorant binding proteins (OBPs) in insects can sense the semiochemicals in the environment and initiate the delivery of signals to their receptors. However, no Chrysopa pallens OBP (CpalOBP) structure has been reported yet, and their corresponding candidate semiochemicals are still largely unknown. Here, we reported the structure of CpalOBP4 solved with X-ray diffraction and showed its potential ligands. Our results showed that CpalOBP4 has a classical OBP structure with six α-helices and three disulfide bridges, and it can bind with farnesene , 2-tridecanone, cis-3-hexenyl hexanoate, nerolidol and farnesol through a central hydrophobic cavity. Our molecular docking results showed that Met31, Met78, Leu98, Phe141, Leu142 and Pro143 in the hydrophobic cavity were the key residues mediating the interaction of CpalOBP4 with farnesene , 2-tridecanone and cis-3-hexenyl hexanoate, which was further proven by the results that mutations of these residues led to significantly reduced binding affinities of CpalOBP4 for these ligands. Our study provides useful information for the further investigation of the biological function of CpalOBP4 as well as important cues for improving biological control in agriculture.
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Sustainable Energy & Fuels
·
2019
·Vol. 4
·期 4
·1621-1629
·
IF 4.912
Yachao Du,Qingwen Tian,Jin Huang,Yuechao Zhao,Xiaohuan Chang,Afei Zhang,Sixin Wu
Additional elements in Cu2ZnSn(S,Se)4 (CZTSSe) absorber layers present a viable strategy to improve the performance of thin film solar cells. In this study, heterovalent cation doping by partially substituting metal cations with Ga3+ is explored by constructing a sandwich-like configuration. We demonstrated that a low doping level of Ga3+ can be successfully incorporated into the host lattice of CZTSSe to form a homogeneous Cu2ZnSn(Ga) (S,Se)4 (CZTGSSe) alloy material. Characterization was performed using SEM, EDS, XRD, Raman spectroscopy, and XPS, which showed that the material fabricated by this heterovalent cation doping method expressed high phase purity, appropriate valence components, and suitable optical bandgap, which are vital for high performance solar cells. As a result, the champion device achieves stabilized efficiency as high as 10.80%, improved by nearly 28% compared with only 8.43% for the reference device.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Xianzhen Yin,Yiting Li,Congling Yang,Jie Weng,Jianxin Wang,Jie Zhou,Bo Feng
Macrophage phenotype conversion is crucial for improving post-traumatic angiogenesis and tissue repair. Biomaterials with the ability of skewing macrophage phenotype have attracted widespread attention in the field of tissue engineering. The aim of this study was to transform macrophage phenotype by a three-step process; anodizing, drug loading and coating with polyelectrolyte multilayer (PEM) films. Interleukin (IL)-4, an anti-inflammatory cytokine, was loaded into titania nanotubes (TNTs) on the titanium surface. Subsequently, sodium alginate (ALG) and chitosan (CS) were alternately assembled onto IL-4-loaded TNTs and cross-linked with genipin/calcium chloride, finally forming cross-linked PEM films. The IL-4 release profile and cellular immune response of the modified surface was investigated. In the simulated biological solution, only 20% of IL-4 were detected in the first 3 days, with a sustained release of approximately 5 ng over 10 days. The results of gene expression and protein secretion in macrophages indicated that IL-4-loaded PEM films significantly attenuated the inflammatory activity of macrophages at the later stage through down-regulating the mRNA and protein levels of inflammatory markers. In summary, IL-4 was controlled released from the cross-linked PEM films deposited on the nanotubes, leading to the temporal conversion of macrophage phenotype.
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