Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Taotao Liu,Wenwen Nie,Wei Song,Tong Zhou,Haiying Tang,Xinghai Li,Xuefeng Yu,Guoyu Zhang,Ning Zhao,Changsong Wang
More than 80 % of the potash fertilizer globally is produced by the froth flotation process. Octadecylamine (ODA) and 4-dodecylmorpholine (DMP), the most commonly used flotation collectors, are discharged into salt lakes, posing a hazard to human health and environmental safety. This study investigated ODA and DMP degradation processes under ultraviolet radiation. The experimental results showed that the degradation efficiency of ODA and DMP of 10 ppm reached 100 % within 60 min of UV irradiation in the brine. In contrast, complete degradation in pure water required 80 and 90 min for ODA and DMP, respectively. Notably, salt ions significantly accelerated the degradation of these organic amines compared to pure water. The nitrogen element in both compounds was ultimately converted into ammonium (NH₄⁺). Total organic carbon (TOC) measurements and gas chromatography-mass spectrometry (GC-MS) analyses revealed that the degradation process initiated with the cleavage of C-N bonds, followed by the breakdown of carbon chains. Based on GC-MS data, potential degradation pathways and mechanisms for ODA and DMP were proposed. The possible degradation pathways and mechanisms of ODA and DMP were proposed following GC-MS analyses. Field experiments and the detection of organic compounds in actual brines further validated the photodegradation reactions and mechanisms of the organic amines. This work guides the use of flotation agents and pollution control to produce potassium salts in salt lakes and aids in understanding the degradation processes of organic amines in natural environments.
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Xingxin Wang,Kwangnak Koh,Hongxia Chen
A novel colorimetric method has been developed for butyrylcholinesterase (BChE) assay and screening of its inhibitors based on para -sulfonatocalix[4]arene-modified gold nanoparticles (pSC 4 -AuNPs). The host–guest interaction between succinylcholine (SuCh, substrate of BChE) and two pSC 4 -AuNPs result in pSC 4 -AuNPs tending to aggregate. However, the hydrolyzed product of choline (Ch) has no coordination reactivity with pSC 4 . Therefore, owing to the hydrolysis of BChE, the aggregation of pSC 4 -AuNPs will be influenced by BChE activity. A simple colorimetric method for the assay of BChE activity can be developed. Under the optimized experimental conditions, the ratios of absorbance at a wavelength of 700 nm to that at 528 nm vary linearly with the BChE activity in the range from 0.05 to 0.25 U mL −1 with the lowest detection limit of 0.0068 U mL −1 , providing a new tool for the direct measurement of BChE. Moreover, using this proposed method, the inhibition effect of Tacrine on BChE activity can be tested with IC 50 values of 220 μM. This method has great potential not only for the detection of BChE activity but also for the screening of the inhibitors.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Taotao Zhao,Yuchi Liu,Chenyang Shen,Gui Liu,Jun Yao,Xiaofeng Qian,Qiang He,Feifei Mei,Deming Meng,Xuefeng Guo,Luming Peng,Nianhua Xue,Yan Zhu,Yuming Zhou,Weiping Ding
Here, we report a high-performance catalyst MoS x @HSSZ-39 for conversion of CO x to C 2–4 hydrocarbons, in which MoS x clusters for CO x hydrogenation at the first to intermediate methanol and then the zeolitic acid sites surrounding for further conversion of methanol to hydrocarbons. For CO 2 hydrogenation, C 2–4 hydrocarbons of ∼90% selectivity in organic products at 32.7% of CO 2 conversion and excellent stability of 1000 h on stream are obtained. For CO hydrogenation, 95% of C 2–4 hydrocarbons, 83% of LPG or 74% of propane selectivities at > 22% CO conversion and stable more than 200 h on stream are obtained. The cooperation among the MoS x clusters and the zeolitic acid sites constitutes the catalyst of intimate bifunction, which is the key to the high catalytic performance for CO x hydrogenation.
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KOREA-AUSTRALIA RHEOLOGY JOURNAL
·
2024
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IF 2.2
Hong Zonghao,Wu Shilong,Chen Quan
This study places a focus on flow-induced demixing of polyisoprene (PI) and poly(4-tert butyl styrene) (PtBS) polymer blends with high dynamic contrast. The rheological response is governed by the more immobilized PtBS chains. In contrast, the dielectric response at low frequency reflects exclusively the normal mode of PI chains having type-A dipole parallel along the chain backbone. These features enable selective detection of the component dynamics of PtBS or PI chains under either the small amplitude oscillatory shear or the nonlinear steady shear through a combination of rheological and dielectric techniques. We find the Cox–Merz rule fails significantly for the PtBS/PI blends, which is attributed to flow-induced demixing when the shear rate is higher than the relaxation rate of PtBS chains and lower than that of PI chains. The flow-induced demixing is further supported by varying the molecular parameters of PtBS, copolymerizing PtBS with polystyrene, as well as by the rheo-dielectric measurements that show a broadening of the PI relaxation mode distribution. This demixing could be partly driven by the increased conformational entropy of the PI chains after segregation from the surrounding restrictive PtBS chains. Graphical abstract
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Inorganics
·
2024
·Vol. 12
·期 5
·136
·
IF 3.1
Yanshuai Cui,Shukai Li,Ning Yu,Xiaodong Yu,Xianbing Ji,Longgang Wang
4-nitrophenol (4-NP) is a frequently encountered toxic phenolic organic pollutant in water. It is important to develop a simple method to treat 4-NP. Small and monodispersed gold nanoparticles often have good catalytic performance of 4-NP. Hemoglobin (Hb) is a kind of common and important protein in organisms. Herein, highly biocompatible bovine hemoglobin-stabilized gold nanoparticles (Aun-Hb NPs) were synthesized using hemoglobin as a biological template. Then, the size, zeta potential, and composition of Aun-Hb NPs were investigated by transmission electron microscopy, dynamic light scattering, and X-ray photoelectron spectroscopy. The Aun-Hb NPs with small gold nanoparticles of about 1.4–2.4 nm had good catalytic capabilities in reducing 4-NP to form 4-aminophenol. Au20-Hb NPs demonstrated superior catalytic efficiency in the reduction of 4-NP when compared to other nanoparticles. Moreover, as-synthesized Au20-Hb NPs exhibited excellent biocompatibility through the MTT experiment. The method of preparation of gold nanoparticles offers one way to prepare metal nanoparticles for good potential catalytic applications of gold nanoparticles.
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Surfaces and Interfaces
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2024
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IF 5.7
Xiaoxu Xu,Yuxin Sun,Kexin Lv,Yao Liu,Zhangpei Chen,Yifan Ouyang,Jianshe Hu,Qifan Chen
Palladium-based non-homogeneous catalysts have attracted considerable attention due to their high catalytic efficiency and adaptability. However, they still face the challenges of long reaction routes and poor cycling stability. An economical, efficient, stable and environmentally friendly catalyst PdNi@CN was prepared by loading nickel-palladium nanoparticles onto nitrogen-doped carbon functionalized carrier material. The catalyst was thoroughly characterized using XRD, XPS , SEM, TEM , VSM, and ICP . PdNi@CN could efficiently catalyze the Suzuki coupling reaction (Iodobenzene and phenylboronic acid , 97 % yield, TON (Turnover Number)=1.62 × 10 2 , TOF (Turnover Frequency)=2.43 × 10 2 h -1 ). Furthermore, PdNi@CN exhibited high activity in the reduction of 4-nitrophenol (4-NP, K app =8.01 × 10 –2 s -1 ). After five cycles of catalysis, the conversion of 4-NP still reached 95 %, demonstrating the excellent structural stability and high catalytic performance of PdNi@CN.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
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2024
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IF 1.7
Erhai An,Zijun Fan,Yingxin Tan,Kanghui Jia,Qingfeng Qin,Haixia Zhao,Kehua Han,Peng Deng,Xiong Cao
The high detonation and thermostability of the molecular perovskite energetic material DAP-4 attracted a lot of interest, but its high friction sensitivity hindered its applicability. It is critical to minimize the friction sensitivity of DAP-4 for future applications. DAP-4-based composites with core-shell structures coated by polymer binders were devised and manufactured in this study. DAP-4 was discovered to be polymer binder compatible, and the thermal breakdown temperature remained constant at 380°C. The friction sensitivity of DAP-4-based core-shell composites increased from 36 N (raw DAP-4) to 60 N (DAP-4@Estane-5703, DAP-4@F2602, and DAP-4@F2311) when 10% polymer binders were added as shell-structured layers. Furthermore, their theoretical detonation performance was calculated, and each sample demonstrated superior performance. Among them, the theoretical detonation velocity of DAP-4@F2602 reached 8081 m/s, and the heat of detonation was 5.118 kJ/kg. This provided proof-of-concept work for increasing the mechanical safety of molecular perovskite energetic materials.
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LANGMUIR
·
2024
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IF 3.7
Jieyi Chen,Yan Gao,Shixiang Zuo,Huihui Mao,Xiazhang Li,Wenjie Liu,Chao Yao,Haoguan Gui
A monolithic catalyst was fabricated through an emulsion-templating method, postpolymerization modification, and in situ loading of active constituents. To achieve a high specific surface area, divinylbenzene (DVB) was solely employed as the monomer, while the porous structure was adjusted with the porogen content and the types of initiators. Then, anchor points were introduced on the pore wall through nitration and amination of the polymeric scaffold. Using a controlled “silver mirror reaction”, monolithic catalysts were obtained after loading of silver nanoparticles (Ag NPs), which was verified from morphological and crystallinity characteristics. The catalytic performance of the resultant monolithic catalyst was determined with the model reduction of 4-nitrophenol (4-NP). In static catalysis, the monolithic catalyst was proved to have a reactively high apparent rate constant and a good reusability. Furthermore, a flow reactor was fabricated with the monolithic catalyst, showing a high efficiency and long-term durability for the continuous reduction of 4-NP. This work broadened the adjustment of porous structures and the subsequent application for emulsion-templated monoliths.
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PubMed
高影响因子
LANGMUIR
·
2018
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IF 3.789
Zhigang Yin,Yuehua Hu,Wei Sun,Chenyang Zhang,Jianyong He,Zhijie Xu,Jingxiang Zou,Changping Guan,Chenhu Zhang,Qingjun Guan,Shangyong Lin,Sultan Ahmed Khoso
A novel compound 4-amino-5-mercapto-1,2,4-triazole was first synthesized, and its selective adsorption mechanism on the surface of chalcopyrite was comprehensively investigated using UV–vis spectra, zeta-potential, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy measurements (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), and first principles calculations. The experimental and computational results consistently demonstrated that AMT would chemisorb onto the chalcopyrite surface by the formation of a five-membered chelate ring. The first principles periodic calculations further indicated that AMT would prefer to adsorb onto Cu rather than Fe due to the more negative adsorption energy of AMT on Cu in the chalcopyrite (001) surface, which was further confirmed by the coordination reaction energies of AMT-Cu and AMT-Fe based on the simplified cluster models at a higher accuracy level (UB3LYP/Def2-TZVP). The bench-scale results indicated that the selective index improved significantly when using AMT as a chalcopyrite depressant in Cu−Mo flotation separation.
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Separations
·
2025
·Vol. 12
·期 2
·27
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IF 2.7
Zhiyu Zhao,Lianjing Mao,Tianyu Zheng,Xiao Li,Chunsen Ye,Pengrui Zhang,Huifang Li,Wei Sun,Jinhe Sun
Enriched lithium isotopes (6Li and7Li) are essential in the nuclear energy industry, where6Li is bombarded with neutrons to produce tritium for fusion reactions, while7Li is used as a core coolant and pH regulator. Separation of6Li and7Li by electromigration is a promising method for producing enriched lithium isotopes that fulfill industrial needs. In this work, based on a previously proposed biphasic system electromigration routine, a three-stage system of ‘LiCl aqueous solution (anolyte)|B12C4-[EMIm][NTf2] organic solution|NH4Cl aqueous solution (catholyte)’ was constructed and the rules of lithium isotope separation and lithium-ion migration investigated. It was shown that the isotope enrichment effect of the catholyte was greatly affected by the experimental conditions, while that of the organic solution was less affected. As the B12C4 concentration increased, enhancement of7Li enrichment in the catholyte and6Li enrichment in the organic solution was observed, and α(C/O) and α(O/A) reached 0.975 and 1.018 at B12C4 of 0.5 mol/L. With the increase in current, migration time, and LiCl concentration, the isotope that was enriched in the catholyte trended from7Li to6Li (about 6 mA, 12 h or LiCl of 5 mol/L). Taking lithium-ion transport efficiency and lithium isotope separation effect into consideration together, a current of at least 6 mA, duration of at least 12 h, LiCl concentration of at least 1 mol/L and B12C4 concentration of 0.2 mol/L are suggested for the electromigration process. The work provides an important reference for system construction and experimental design of a biphasic electromigration separation method, which is expected to be an industrial alternative because of its environmental protection and high efficiency.
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Chemistry-An Asian Journal
·
2024
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IF 3.5
Jixiang Duan,Kaixiang Shen,Zhihong Ye,Qinyu He,Afzalshoh Qahramon Zarifzoda,Fuming Chen
The photocatalytic proficiency of Bi 2 Ti 2 O 7 is hindered by its inadequate solar energy harnessing capability and swift electron-hole recombination dynamics. In the investigation, the study innovated Bi metal oxide heterostructures by embedding Bi nanoparticle-modified Bi x Ti (4-x) O 7 composites, systematically synthesizing a suite of Bi/BT materials through meticulous tuning of the Bi and Ti precursor ratios. Notably, the Bi/BT-2 series was examined for its photocatalytic performance in tetracycline (TC) degradation. The findings revealed that Bi/BT-2 exhibited remarkable TC degradation efficiency, achieving a removal rate of 99.6 %, which surpasses BT-2 by a factor of 3.25 and TiO 2 by 1.67 times. Mechanistic probing unveiled that the incorporation of nanostructured Bi onto the Bi x Ti (4-x) O 7 surface introduced fresh active sites, dramatically bolstering the photocatalytic activity by augmenting the light absorption spectrum and refining charge separation processes. Moreover, an exhaustive examination of the TC degradation mechanism facilitated by Bi/BT-2 demonstrated sustained efficiency exceeding 80 % across a pH range spanning from 3 to 9, emphasizing its promising potential for practical applications. This study contributes invaluable perspectives for the design of cutting-edge metal-oxide photocatalysts tailored for environmental remediation purposes. Synopsis : The low degradation efficiency of tetracycline has posed a major challenge in bismuth titanate research. To address this, a novel approach was implemented by developing a Bi x Ti (4-x) O 7 composite catalyst modified with Bi nanoparticles. This modification forms a metal-oxide heterojunction, which significantly enhances the degradation efficiency.
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ELECTROCHIMICA ACTA
·
2024
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IF 5.5
Zhefei Zhao,Xuyao Yao,Linlin Zhang,Minhao Chen,Xingyu Luo,Ruopeng Yu,Yinghua Xu,Youqun Chu,Xinbiao Mao,Huajun Zheng
Electrochemical selective dechlorination for the synthesis of high value-added chemical products is an economical and promising technology. Although silver (Ag) electrode is the most representative catalyst in most electrocatalytic dehalogenation reactions, the selectivity for specific reaction needs to be improved. In this framework, AgCu bimetallic electrocatalysts were designed for the selective dechlorination of 4-amino-3,5,6-trichloropyridine carboxylic acid (4-N-3,5,6-TCP) to 4-amino-3,6-dichloropyridolinic acid (4-N-3,6-DCP). The optimum Ag 16 Cu 4 electrode exhibits excellent performance with 99.0% selectivity and 98.8% yield of 4-N-3,6-DCP, surpassing the pure Ag electrode. The combined results of experimental measurements and theoretical calculations indicated that the introduction of Cu modulates the electronic structure of Ag, which not only promoted the transfer of charges, but also reduces the energy barrier of the rate-determining step (the C H formation). In addition, the practicality and scalability of this system was evaluated using a flow-cell reactor. This study demonstrates that AgCu bimetallic catalyst plays a crucial role in determining the selectivity and activity in the electrochemical dechlorination of 4-N-3,5,6-TCP and displays the prospective applications.
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