WATER RESEARCH
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2022
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IF 13.4
Fuwei Sun,Tianhu Chen,Ziyang Chu,Peixun Zhai,Haibo Liu,Qiang Wang,Xuehua Zou,Dong Chen
A system of Cu 2+ /calcite/PDS was constructed to degrade sulfadiazine (SDZ). Different from the traditional Cu-mediated activation, a low concentration of Cu 2+ that met drinking water standards (≤ 1 mg/L) transformed into Cu(Ⅱ) solid in the presence of calcite, and then enhanced the degradation of SDZ via PDS activation over a pH range from 3 to 9. According to scavenger and chemical probe experiments, Cu(Ⅲ), rather than radicals (hydroxyl radicals and sulfate radicals) and singlet oxygen, was the predominant reactive species, which was responsible for the degradation of SDZ. Based on the results of XRD, ATR-FTIR, and CV curves et al., CuCO 3 was the main complex with high reactivity for PDS activation to form Cu(Ⅲ). Moreover, detailed degradation pathways of sulfadiazine were proposed according to the UPLC-ESI-MS/MS and their toxicity was predicted by ECOSAR. Besides, the real water matrix would not seriously affect the degradation of SDZ in the Cu 2+ /calcite/PDS system. In summary, this study reveals a new insight into the synergistic effect of Cu 2+ and calcite on the SDZ degradation, and promotes an understanding of the environmental benefits of natural calcite.
研究领域:
环境科学
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化学工程
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分析化学
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水处理
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Long Zhou,Longwei Yin,Zuliang Chen
Arsenic (As) contamination in groundwater is a growing global environmental issue, and effectively removing both As(III)) and As(V) from groundwater presents a significant challenge. In this study, a novel functional composite, FePd@ZIF-8, was synthesized using a two-step method for the simultaneous removal of As species. It was observed that FePd@ZIF-8 achieved removal efficiencies of 89.42 % for As(V) and 32.74 % for As(III), respectively. Characterization confirmed the successful synthesis of FePd@ZIF-8 and demonstrated that the valence state of As(V) and As(III) remained unchanged during the removal process. XPS and FTIR analyses revealed that the As species was adsorbed onto the surface of the material through complexation. The adsorption isotherms and kinetics indicated that the removal process was dominated by chemisorption. In groundwater applications, FePd@ZIF-8 could still achieve 85.62 and 70.46 % removal efficiency for As(V) and As(III) after four cycles, respectively. This study demonstrates that FePd@ZIF-8 holds significant potential for effectively removing As species from groundwater.
研究领域:
环境科学
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纳米技术
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水处理
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材料科学
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吸附技术
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DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 36
·22485-22491
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IF 3.108
Hailiang Zhao,Shanshan Tang,Qun Zhang,Lin Du
The weak intermolecular interaction between 2,2,2-trifluoroethanol (TFE) and 3-chloro-2-methyl-1-propene (CMP) has been investigated by gas phase FTIR spectroscopy and DFT calculations. CMP offers two hydrogen bond docking sites to the hydrogen bond donor: the chlorine atom (O–H⋯Cl) and the CC π electron system (O–H⋯π). DFT calculations suggest that MeOH approaches CMP in five different orientations. The structural, energetic, and spectroscopic parameters of the most stable structures in each orientation were studied, and their binding energies range from −25.5 to −19.5 kJ mol−1. The docking to the π system is at least 1 kJ mol−1 more favored than the docking to the chlorine atom. The equilibrium constant for complexation (2.3 × 10−2) was determined from the experimental and calculated intensity of the OH-stretching transition. The Gibbs free energy of formation was found to be 9.3 kJ mol−1. The nature of the non-covalent interaction was analyzed with the atoms in molecules (AIM) method.
研究领域:
物理化学
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结构化学
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分子光谱学
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量子化学计算
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分子间相互作用
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DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
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2019
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IF 2.923
Yao Wang,Baohuan Jia,Min You,Haoran Fan,Siyu Cao,Hui Li,Wenkai Zhang,Gang Ma
Amyloid fibrillation by hen egg white lysozyme (HEWL) under the influences of two common surfactants, sodium dodecyl sulfate (SDS) and Triton X-100 (TX-100), was investigated with atomic force microscopy (AFM) and Fourier transform infrared (FTIR) spectroscopy. Detailed AFM investigations indicated that both SDS and TX-100 were able to induce some significant morphological changes of HEWL amyloid fibrils. Both SDS and TX-100 could induce a morphological change which was characterized with alternating fibril regions with increased thicknesses along the fibril axis. In addition, TX-100 was also able to induce a morphological change which was characterized with fibril branching. In contrast, the positively charged cetyltrimethylammonium bromide displayed no such effect as compared with the negatively charged SDS and the nonionic TX-100. These intriguing modulation effects of SDS and TX-100 on amyloid fibrillation were hypothesized to be due to surfactant-induced surface-catalyzed secondary nucleation owing to the noncovalent interaction between the surfactants and HEWL. The proposed hypothesis was further supported by FTIR spectroscopic investigation, which demonstrated the formation of a SDS–amyloid fibril complex and TX-100–amyloid fibril complex. Detailed FTIR analysis suggested that the tail group of SDS associated with amyloid fibrils is more disordered similar to that of SDS in aqueous solution, while the headgroup of SDS appears to interact with amyloid fibrils strongly similar to that of SDS in the solid state, and the ether groups of TX-100 associated with amyloid fibrils experienced a different microenvironment as compared with that of neat TX-100. Additional control experiments with FTIR spectroscopy revealed that the interactions of SDS/TX-100 with HEWL amyloid fibrils were different from those of SDS/TX-100 with HEWL amorphous aggregates. In addition, the β-sheet structures of the HEWL amyloid fibrils were found to be increased due to the influences of SDS and TX-100. Our work provides new insight into the modulation effects of surfactants on amyloid fibrillation.
研究领域:
生物化学
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分子生物学
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蛋白质科学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Danna Shan,Yan Shi,Bin Zhou,Zilin Liu,Liu Yang,Xuetao Zhu,Qishi Luo,Guanghe Li
A simple and convenient method was used to prepare a novel granular half wrapping-structured amendment (HWA) for stabilization of both cationic and anionic heavy metals. By coating Ca(OH) 2 with silicate minerals to obtain the core-coating wrapping balls, followed by drying and mixing with FeSO 4 , the final HWA effectively prevented the reaction of FeSO 4 with Ca(OH) 2 and exihibited high stabilization of arsenic (As) and cadmium (Cd) in the contaminated soils simultaneously and continuously. XRD, FTIR and SEM characterization showed that Ca(OH) 2 was successfully wrapped by zeolite without changing their chemical properties. The amendment illustrated relatively fast stabilization for As and Cd, and the stabilization rate by HMA prepared at FeSO 4 ·7H 2 O: zeolite: Ca(OH) 2 = 6.5:1:1 was 95.5% for As and 94.6% for Cd, much higher than the compound material (CM) which had side effect on Cd stabilization. In the effect of storage time experiment, when HWA was stored from 0 day to 365 days, the stabilization rate of As and Cd by HWA just decreased 3.4% and 4.3%, respectively. While the addition of CM to the soil reduced the As stabilization rate from 91.1% to 87.1% and the Cd stabilization rate was reduced from −139.8% to −223.1%. The long-term soil stabilization study demonstrated that HWA could decrease the concentration of extricable As and Cd simultaneously and continuously for 365 days without notable changes in soil pH. This research develops an easy method to synthesize granular HWA for the stabilization of cationic and anionic heavy metals from the actual contaminated soils.
研究领域:
环境科学
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土壤化学
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污染控制
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DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Zhongchun Yuan,Tingting Cao,Min Deng,Jun Ma,Shuo Geng,Chunliang Yang,Yuan Ren,Mengqin Yao,Fei Liu,Xiaodan Wang
It is very crucial but still a huge challenge to develop efficient and durable catalysts to promote hydrogen production from formic acid (FA). Herein, three CeO 2 with structurally well-defined different shapes, i.e., sCeO 2 (spheres), rCeO 2 (rod) and oCeO 2 (octahedral), are prepared, and their effect on the crystal faces and oxygen vacancy over the constructed heterostructure catalysts (Pd-CeO 2 /C) have been intensively investigated in the FA dehydrogenation. Pd-sCeO 2 /C outperforms the other catalysts with a turnover frequency (TOF) value of 2691 h −1 and selectivity to hydrogen of 100 % at 30 °C. A synergism between the CeO 2 (1 1 0) facet and more oxygen vacancies is considered to be key to obtaining the high reactivity. Moreover, biomass carbon promotes the dispersion of Pd-CeO 2 heterostructures due to its large specific surface area and causes more defects in the Pd-CeO 2 /C. Combined with in-situ FTIR and density functional theory (DFT), it is speculated that FA is decomposed through formate pathway over the Pd-sCeO 2 /C. This work thus provides a reasonable design and controllable synthesis strategy for the effective application of FA as an available liquid phase hydrogen storage material.
研究领域:
催化
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材料科学
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化学工程
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物理化学
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DOI
高影响因子
CARBOHYDRATE POLYMERS
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2023
·
IF 11.2
Fuyue Dong,Wei Gao,Pengfei Liu,Xuemin Kang,Bin Yu,Bo Cui
In this study, microcrystalline butyrylated pea starch (MBPS) with higher contents of resistant starch (RS) was synthesized via esterification with butyric anhydride (BA) using microcrystalline pea starch (MPS) as the raw material. With the addition of BA, the new characteristic peaks appeared at 1739 cm −1 and 0.85 ppm obtained from FTIR and 1 H NMR, respectively, and increased with the higher degree of BA substitution. Moreover, an irregular shape of MBPS, such as condensed particles and more cracks or fragments, had been observed by SEM. Further, the relative crystallinity of MPS increased then native pea starch and decreased with the reaction of esterification. MBPS had higher decomposition onset temperature (T o ) and temperature of maximum decomposition (T max ) with increasing DS values. Simultaneously, an increasing trend RS content from 63.04 % to 94.11 % and a decreasing trends in rapidly digestible starch (RDS) and slowly digestible starch (SDS) contents of MBPS were recorded with increasing DS values. MBPS samples showed higher production capacity of butyric acid ranging from 553.82 μmol/L to 892.64 μmol/L during the fermentation process . Compared with MPS, the functional properties of MBPS were significantly improved.
研究领域:
食品科学
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化学
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营养学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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2025
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IF 2
Su Zifei,Shi Chunjing,Meng Fanning,Yang Ying,Yang Jinyao,Wang Zhihui,Wang Menghang,Cao Chun
Cleaning of silicon (Si) wafers has become the key process in integrated circuit (IC) manufacturing, improving the quality and usability of Si wafers. However, traditional cleaning slurries usually contain strong and corrosive acids and alkalis, resulting in the potential damages to the environment and operators, as well as corrosion to Si wafers and production of wastes. To solve this challenge, a novel green slurry was developed, including Sodium carbonate and Citric acid. Under the action of the developed slurry, Si wafers were treated via synergetic effect between interval ultrasonication and paddle stirring. Orthogonal tests were performed through adjusting the concentration of Sodium carbonate and Citric acid, and time and temperature of cleaning. Energy-dispersive spectroscopy (EDS) analysis has revealed that the surface impurities on Si wafers reach their lowest levels (Na < 0.3%, Fe < 0.15%) under specific processing conditions. These optimal conditions include a Sodium carbonate concentration of 12 wt.% and a Citric acid concentration of 10 wt.%. Additionally, the processing temperature should be maintained at 45 °C, with a duration of 50 min. Prior to and after cleaning, surface roughness Ra of Si wafer is reduced from 9.39 ± 0.38 to 5.56 ± 0.51 nm. Combining x-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectrometer (FTIR) analysis, these impurities, such as oxyacid, organics, metallic oxides and metal ions, were removed from the Si wafers under different acidic and alkaline environments, through chelation and redox reactions. Therefore, the developed green slurry and novel approach using chemical and ultrasonic composite fields provide new insights for the cleaning and manufacturing of Si wafers.
研究领域:
半导体制造
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材料科学
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表面工程
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环境化学
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化学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 6
·3454-3464
·
IF 4.036
Weijing Kong,Qiaolin Du,Yinan Qu,Changyu Shao,Chaoqun Chen,Jian Sun,Caiyun Mao,Ruikang Tang,Xinhua Gu
It is currently known that crosslinking agents can effectively improve the mechanical properties of dentin by crosslinking type I collagen. However, few scholars have focused on the influence of crosslinking agents on the collagen-mineral interface after crosslinking. Analysis of the Fourier transform infrared spectroscopy (FTIR) results showed that hydrogen bonding occurs between the tannic acid (TA) molecule and the collagen. The crosslinking degree of TA to collagen reached a maximum 41.28 ± 1.52. This study used TA crosslinked collagen fibers to successfully induce dentin biomineralization, and the complete remineralization was achieved within 4 days. The crosslinking effect of TA can improve the mechanical properties and anti-enzyme properties of dentin. The elastic modulus (mean and standard deviation) and hardness values of the remineralized dentin pretreated with TA reached 19.1 ± 1.12 GPa and 0.68 ± 0.06 GPa, respectively, which were close to those of healthy dentin measurements, but significantly higher than those of dentin without crosslinking (8.91 ± 1.82 GPa and 0.16 ± 0.01 GPa). The interface energy between the surface of collagen fibers and minerals decreased from 10.59 mJ m−2 to 4.19 mJ m−2 with the influence of TA. The current work reveals the importance of tannic acid crosslinking for dentin remineralization while providing profound insights into the interfacial control of biomolecules in collagen mineralization.
研究领域:
牙科材料
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生物材料
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生物矿化
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胶原科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Environmental Technology & Innovation
·
2023
·
IF 7.1
Hong-Yan Wang,Amit Kumar,Jin Li,Peng Chen,Zhi-Guo Yu,Guo-Xin Sun
Lanthanum (La)-loaded biochar (BC) was considered as an efficient adsorbent for phosphate removal in wastewater. Arsenate has a similar chemical structure to phosphate, however, performance and mechanisms of arsenate adsorption onto La-doped biochar are less studied and remain unclear. In this study, La-modified biochar (BC) was prepared using two dinstinct methods: pyrolysis of LaNO 3 -doped rice husk (pre-pyrolysis modification, referred to as La-BC) and pyrolysis of LaNO 3 -doped rice husk biochar (post-pyrolysis modification, referred to as BC-La). Isotherm experiments showed that the maximum arsenate adsorption content onto La-BC and BC-La was similar, respectively of 21.3 mg g −1 and 16.5 mg g −1 at pH = 5. Combined results of SEM-EDS, FTIR, and XPS analyzing revealed that La oxides and hydroxides loaded on BC played a vital role in arsenate adsorption. Electrostatic attraction and ligand exchange were considered as key mechanisms for arsenate adsorption. Compared to La-BC, the results revealed that La oxides/hydroxides exhibited more crystalline structures on BC-La. Moreover, the BC-La displayed more efficient adsorption capabilities over a wider pH range (pH 4–10) than La-BC. The XPS O1s spectra analysis confirmed the formation of different inner-sphere complexes on La-BC and BC-La. Results of this study revealed mechanisms of arsenate adsorption onto La-modified biochar, and highlighted that the adsorption behavior of arsenate onto La-modified biochar could be significantly influenced by modification methods.
研究领域:
环境科学
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材料科学
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化学工程
·
水处理
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Huiqi Jin,Haiqiang Shi,Wenchao Jia,Yanning Sun,Xueru Sheng,Yanzhu Guo,Haiming Li,Haidong Sun
The molecular weight is one of the most important factors influencing the utilization of industrial lignin obtained from chemical pulping process. In this paper, a facile operative green solvent system was successfully developed for molecular weight-controllable fractionation of industrial alkali lignin (IAL) at room temperature. The results showed that through adjusting the ratio of water, ethanol and γ-Valerolactone (GVL), the industrial lignin was fractionated into six levels with molecular weight stepwise controllable from low to high. The fractionation is a physical process according to FTIR and 2D-HSQC NMR analysis, and the chemical structure of lignin has not changed. Additionally, the polydispersity of fractionated lignin with higher molecular weight tends to be narrower. The content of hydroxyl and carboxyl group is higher for the fractionated lignin with lower molecular weight, which would be beneficial for the chemical reactivity in the down-stream application.
研究领域:
化学工程
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材料科学
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环境科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Yinghui Sun,Guojie Zhang,Jiwei Liu,Peiyu Zhao,Peng Hou,Ying Xu,Riguang Zhang
CH 4 CO 2 reforming to syngas was investigated over three different activated carbon catalysts. To better understand the influence of the supports on the catalytic properties , catalysts were analyzed by some characterization methods, such as nitrogen adsorption–desorption isotherms, XRD , H 2 -TPR, NH 3 -TPD, CO 2 -TPD, FTIR, TEM and EDX . The results showed that the catalyst with AC 2 as the support provided the best catalytic activity . The CH 4 conversion and CO 2 conversion were 92% and 98% at 900 °C, respectively; best selectivity with the H 2 /CO ratio was close to 1 among the three supports used. It also showed a better stability at 900 °C. H 2 -TPR analysis showed that Co species in Co/AC 2 catalyst were strong interaction with the support. It was observed that active metals were well dispersed on the AC 2 support by the TEM. In addition, the ratio of CH 4 /CO 2 also had great influence on the CH 4 and CO 2 conversion.
研究领域:
催化
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化学工程
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）