WATER RESEARCH
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2020
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IF 9.13
Ying Cao,Wei Qiu,Juan Li,Yumeng Zhao,Jin Jiang,Suyan Pang
UV/sulfite process in the absence of oxygen was previously applied as an advanced reduction process for the removal of many halogenated organics and inorganics in water and wastewater. Here, it was found that UV/sulfite process in the presence of oxygen could act as an advanced oxidation process. Specifically, the oxysulfur radicals (including sulfate radical ( SO 4 · − ) and sulfite/peroxomonosulfate radicals ( SO 3 · − / SO 5 · − )) played important roles on the degradation of iopamidol (IPM) as a typical iodinated contrast media (ICM). Furthermore, the contribution of SO 4 · − on IPM removal gradually increased as pH increased from 5 to 7 and that of SO 3 · − / SO 5 · − decreased. Besides, all water quality parameters (i.e., chloride (Cl − ), iodide (I − ) and natural organic matter (NOM)) investigated here exhibited inhibitory effect on IPM removal. Three inorganic iodine species (i.e., I − , reactive iodine species and iodate (IO 3 − )) were detected in UV/sulfite process in the presence of oxygen, while only I − was detected in that without oxygen. During UV/sulfite/ethanol, UV photolysis and UV/peroxydisulfate (PDS)/ tert -butyl alcohol (TBA) processes, thirteen transformation products including eleven deiodinated products of IPM were identified by ultra HPLC quadrupole time of flight-mass spectrometry (UPLC-Q-TOF-MS). Besides, these products generated by direct UV photolysis, SO 4 · − and SO 3 · − / SO 5 · − were further distinguished. The acute toxicity assay of Vibrio fischeri indicated that transformation products by UV/sulfite under aerobic conditions were less toxic than that by direct UV photolysis.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
Scientific Reports
·
2025
·Vol. 15
·期 1
·1-10
·
IF 3.9
Zhou Haoyan,Zu Mei,Tang Xinxuan,Chang Yuanxi,Li Shiquan,Yang Hongrui,Lv Chenglong,Cheng Haifeng
Molecular sieves were widely used in the chemical industry, which caused a large number of inactivated molecular sieves to be discarded, resulting in a serious waste of resources and environmental pollution. Recently, recycling of discarded molecular sieves (DMS) has become a research hotspot. This study proposes an economical method using DMS to prepare green pigments mimicking foliage spectrum. The synthesized products were subjected to characterization using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Ultraviolet-visible-diffuse reflectance spectroscopy (UV-Vis-DRS), and scanning electron microscopy (SEM). The analysis revealed that sulfur radicals can be effectively incorporated as chromophores within the β-cages that are formed during the recrystallization process of sodalite, these cages are highly conducive to accommodating the radicals, thereby providing a protective environment that shields them from external influences. By adjusting the mass ratio of Na 2 CO 3 /S, the visible reflectance spectrum of ultramarine pigments can be easily modified. In addition, camouflage coating based on ultramarine green can be used to simulate the spectral reflectance characteristics of green vegetation. The Spectral Angle Mapping (SAM) system was used to evaluate the simulation effect of the camouflage coating. At a threshold below 98.5%, the camouflage coating still be misidentified as leaves, this method can recycle massive solid waste resources and significantly reduce the preparation cost of imitation green vegetation camouflage pigments.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-11
·
IF 17.694
Xia Nan,Xing Jianpei,Peng Di,Ji Shiyu,Zha Jun,Yan Nan,Su Yan,Jiang Xue,Zeng Zhi,Zhao Jijun,Wu Zhikun
Nanoparticle assembly paves the way for unanticipated properties and applications from the nanoscale to the macroscopic world. However, the study of such material systems is greatly inhibited due to the obscure compositions and structures of nanoparticles (especially the surface structures). The assembly of atomically precise nanoparticles is challenging, and such an assembly of nanoparticles with metal core sizes strictly larger than 1 nm has not been achieved yet. Here, we introduced an on-site synthesis-and-assembly strategy, and successfully obtained a straight-chain assembly structure consisting of Ag 77 Cu 22 (CHT) 48 (CHT: cyclohexanethiolate) nanoparticles with two nanoparticles separated by one S atom, as revealed by mass spectrometry and single crystal X-ray crystallography. Although Ag 77 Cu 22 (CHT) 48 bears one unpaired shell-closing electron, the magnetic moment is found to be mainly localized at the S linker with magnetic isotropy, and the sulfur radicals were experimentally verified and found to be unstable after disassembly, demonstrating assembly-induced spin transfer. Besides, spin nanoparticles are found to couple and lose their paramagnetism at sufficiently short inter-nanoparticle distance, namely, the spin coupling depends on the inter-nanoparticle distance. However, it is not found that the spin coupling leads to the nanoparticle growth.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Xiang Fan,Yurou Zhou,Guan Zhang,Tongzhou Liu,Wenyi Dong
The advanced oxidation processes (AOPs) based on oxysulfur radicals (SO 3 − , SO 4 − and SO 5 − ) has been receiving growing attention in wastewater treatment. In this study, we report the in situ photoelectrochemical activation of sulfite to produce oxysulfur radicals with MoS 2 nanosheets as a wide spectrum absorptive photoanode. At alkaline condition, the selective and efficient conversion of ammonia to dinitrogen was exclusively achieved in the presence of sulfite electrolyte under visible light irradiation. The sulfite plays multiple roles such as working as hole scavenger for improving stability of MoS 2 electrode by inhibiting photo-corrosion and serving as precursor of oxysulfur radicals in the meantime. The influences of radical scavenger, dissolved oxygen and electrolyte on the photoelectrochemical, electrochemical and photochemical conversion of ammonia verified that oxysulfur radicals are more powerful than hydroxyl radicals in terms of ammonia conversion. The proposed system appears to be applicable to in situ treatment of wastewater containing of ammonia and sulfite pollutants, such as wastewater from ammonia-absorption-desulfurization of combustion smoke. This work also provides a new protocol in the design of new AOPs, where oxysulfur radicals can work together with hydroxyl radicals for simultaneous pollutants degradation and detoxification.
研究领域:
环境科学
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废水处理
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光电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Qiuyan Li,Mingxia Sun,Yingying Su,Kexin Zhang,Yi Lv
Chemiluminescence (CL) was a recognized excellent analytical method for SO 3 2− . Designing a CL sensing platform not only with selectivity but also with high sensitivity is of great significance for the SO 3 2− detection in complex samples. Herein, a novel chemiluminescence resonance energy transfer (CRET) strategy was designed by doping europium (Eu) into CeO 2 NPs. On the interface of Eu/CeO 2 , SO 3 2− was oxidized to generate the high-energy intermediate SO 2 * and the energy released was absorbed by Eu/CeO 2 nanoparticles to realize CRET. The energy donor (SO 2 * generated by the reaction of Eu/CeO 2 nanoparticles and HSO 3 - ) and the receptor (Eu/CeO 2 nanoparticles) are assembled together which simplifies system and improves the energy efficiency. The CRET system with rapid response (1 s) and high sensitivity (0.007 μM) was successfully exploited for the selective detection of SO 3 2− even in PM 2.5 samples. The study provides a new clue to design simple CL sensors with high selectivity and high sensitivity.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhen Chen,Shipeng Geng,Juan Xiao,Fengyue Zhao,Kun Wang,Yi Wang,Panagiotis Tsiakaras,Shuqin Song
Herein, H 2 O 2 production activity via two-electron water oxidation reaction is identified on metal oxides (WO 3 , TiO 2 , and BiVO 4 ) in acidic SO 4 2− involving electrolyte, in which persulfate (PS) acts as an intermediate. A deep understanding of mechanism of PS production reaction on metal oxides has been realized based on rigorous crystal plane analysis of WO 3 and TiO 2 by combining density functional theory calculations and zeta potential measurements. It is found that the binding-energy of adsorbed hydroxyl groups on dominant exposed crystal plane of WO 3 is lower than that of TiO 2 , leading to more SO 4 2− adsorption sites at the surface of WO 3 . Consequently, the formation of PS on WO 3 surface is more favorable. Meanwhile, both SO 4 − · and OH· were detected in the electrolyte by electron paramagnetic resonance measurement, which play a crucial role in organic pollutants wastewater treatment, with a degradation efficiency of 96% in 90 min for a typical pollutant norfloxacin. This work can provide a novel insight for understanding the selectivity of water and SO 4 2− species oxidation on metal oxides, and open a new way for both on-site H 2 O 2 production and advanced oxidation processes application.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2023
·
IF 5.5
Xin Qi,Yingdong Zhang,Liqun Zhang,Dongmei Yue
The regulation of polymer properties based on stereochemistry is essential but rarely studied. Inspired by the isomerization of unsaturated phospholipids in cell membranes, we report a novel method of preparing stereocontrolled polymer using sustainable Eucommia ulmoides gum (EUG) as a raw material. Under the catalysis of thiyl radical, EUG with 100% trans-1,4-polyisoprene structure isomerized to cis-configuration partly in a controllable way, thus achieving the rational modulate of thermomechanical properties. The isomerization mechanism was verified by density functional theoretical calculation. The isomerized EUG (IEUG) with low cis content (≤8.7%) can serve as plastics or shape memory materials, while high cis content (≥10.7%) IEUG transferred into elastomer materials. Especially for IEUG-10.7%, its vulcanizates without filler reinforcement shows high tensile strength (15.5 MPa) and elasticity (97%) comparable to natural rubber due to its strain-induced crystallization ability, which has the potential to be the second natural rubber. This paper provides a new strategy for stereocontrol of polymer properties, and the prepared materials have broad application prospects in the intelligent sensing and rubber industry.
研究领域:
聚合物科学
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材料科学
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可持续化学
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仿生学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Hussein Abdelraouf,Fanyang Zhou,Yulong Li,Jiayi Ren,Guanshu Zhao,Qingliang Zhao,Jian Wei,Xuedong Zhai,Jing Ding
The easily synthesized, cost-effective, and stable photocatalysts for sulfite activation are always required for the enhancement of organic contaminants degradation. Herein, the facile coprecipitation synthesis of Bismuth oxybromide (BiOBr)/Montmorillonite (MMT) was reported, which could activate sulfite (SO 3 2− /HSO 3 − ) under sunlight and accelerate the catalytic performance more effectively than pristine BiOBr. After adding sulfite to the photocatalysis system, the photodegradation efficiency of atrazine (ATZ) achieved 73.7% ± 1.5% after 5 min and 94.4% ± 1.6% after 30 min of sunlight irradiation with BiOBr/MMT. The BiOBr/MMT-sulfite system also presented remarkable photocatalytic performance to eliminate various contaminants, including ciprofloxacin, sulfadiazine, tetracycline , and carbamazepine. The various features of the photocatalyst materials were studied, including their surface morphology, structure, optical properties , and composition. The results illustrated that by adding MMT, the bandgap of the pristine BiOBr was reduced and the surface area was increased, which led to an increased ability to adsorb materials. Results of various influence factors showed this enhanced system had satisfactory and stable removal performance of ATZ in the pH range of 3.0–6.5, but HPO 4 2− had a strong negative effect on the system performance. Oxysulfur radicals (SO 5 ·- and SO 4 ·- ), h + , and 1 O 2 were discovered as the prevailing active species in the BiOBr/MMT-sulfite system. The proposed degradation mechanism of this photocatalyst-enhanced system revealed that sulfite adsorption on the surface of the photocatalyst played a vital role during the initial phase, and the degradation pathway of ATZ was discussed. This study provides a new synthesis strategy of a photocatalyst for sulfite activation and expands the potential uses of Bi-based photocatalysts in degrading difficult-to-remove organic pollutants.
研究领域:
环境科学
·
化学工程
·
材料科学
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）