CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Haixin Sun,Jianlei Qi,Jianfei Sun,Lin Li,Kunpeng Yu,Jintao Wu,Jianzhong Yin
As a common precursor for supercritical CO 2 (scCO 2 ) deposition techniques, solubility data of organometallic complexes in scCO 2 is crucial for the preparation of nanocomposites. Recently, metal acetylacetonates have shown great potential for the preparation of single-atom catalytic materials. In this study, the solubilities of iron(III) acetylacetonate (Fe(acac) 3 ) and nickel(II) acetylacetonate (Ni(acac) 2 ) were measured at the temperature from 313.15 to 333.15 K and in the pressure range of 9.5–25.2 MPa to accumulate new solubility data. Solubility was measured using a static weight loss method. The semi-empirical models proposed by Chrastil and Sung et al . were used to correlate the solubility data of Fe(acac) 3 and Ni(acac) 2 . The equations obtained can be used to predict the solubility of the same system in the experimental range.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING COMMUNICATIONS
·
2023
·
IF 2.5
Jian-Lei Qi,Qin-Qin Xu,Jian-Fei Sun,Dan Zhou,Jian-Zhong Yin
Due to its dual gas- and liquid-like properties, supercritical carbon dioxide (scCO2) is considered an excellent solvent for dissolving precursors and penetrating nanoscale pores. After subsequent calcination, uniformly dispersed metal or metal oxide nanoparticles or nanowires can be obtained. Organometallic salts are commonly used precursors in this method because they usually have high solubility in scCO2. Therefore, solubility data are essential for the controllable synthesis of such nanocomposites. This work establishes a facile and accessible method for measuring the solubility of organic solids in scCO2. The solubilities of copper acetylacetonate and cobalt acetylacetonate were obtained at temperatures of 313–333 K and pressures of 11–24 MPa. And the solubilities were within 2.3 × 10−2 to 14.1 × 10−2 g/L for Cu(acac)2 and 6.9 × 10−2 to 13.4 × 10−2 g/L for Co(acac)2. The experimental data were fitted to the semi-empirical model with the AARD values of 4.58% and 2.14% for Cu(acac)2 and Co(acac)2, respectively, and the obtained equations could be used to predict solubility of the same systems in the experimental range.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Chengyang Zhang,Guoyang Zhang,Jiyuan Jin,Hongcen Zheng,Zhiwei Zhou,Shujuan Zhang
The coexistence of selenite (Se(IV)) and acetylacetone (AA) generated a synergistic effect on the growth inhibition of a bloom-forming cyanobacterium, Microcystis aeruginosa. The mechanism behind this phenomenon is of great significance in the control of harmful algal blooms. To elucidate the role of Se(IV) in this effect, the reactions in ternary solutions composed of Se(IV), AA (or two other similar hydrogen donors), and quinones, especially benzoquinone (BQ), were investigated. The transformation kinetic results demonstrate that Se(IV) played a catalytic role in the reactions between AA (or ascorbic acid) and quinones. By comparison with five other oxyanions (sulfite, sulfate, nitrite, nitrate, and phosphate) and two AA derivatives, the formation of an AA-Se(IV) complexation intermediate was confirmed as a key step in the accelerated reactions between BQ and AA. To our knowledge, this is the first report on Se(IV) as a catalyst for quinone-involved reactions. Since both quinones and Se are essential in cells and there are many other chemicals of similar electron-donating properties to that of AA, the finding here shed light on the regulation of electron transport chains in a variety of processes, especially the redox balances that are tuned by quinones and glutathione.
研究领域:
环境科学
·
微生物学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Jiyuan Jin,Zhihao Chen,Xiaojie Song,Bingdang Wu,Guoyang Zhang,Shujuan Zhang
Quinones are components of electron transport chains in photosynthesis and respiration. Acetylacetone (AA), structurally similar to benzoquinone (BQ) for the presence of two identical carbonyl groups, has been reported as a quinone-like electron shuttle. Both BQ and AA are important chemicals in the aquatic environment. However, little information is known about their interactions if co-existed. We found here that AA significantly enhanced the conversion of BQ. By analyzing the evolution of chemical concentration, solution pH, dissolved oxygen, and the final products, the interactions between AA and BQ were elucidated. The reactions between BQ and AA generated oxygen but ultimately led to the reduction of solution pH and dissolved oxygen. The reactions proceeded faster under indoor lighting condition than in the dark. The formation of semiquinone radicals is believed as the primary step. The secondary AA-derived radicals might be strongly oxidative or reductive, depending on the concentration of dissolved oxygen. Insoluble humus was generated in the mixture of BQ and AA. These results suggest that the presence of AA might interfere with photosynthesis and respiration through the interactions with quinones.
研究领域:
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Jiyuan Jin,Shujuan Zhang,Bingdang Wu,Zhihao Chen,Guoyang Zhang,Paul G. Tratnyek
Quinones are important electron shuttles as well as micropollutants in the nature. Acetylacetone (AA) is a newly recognized electron shuttle in aqueous media exposed to UV irradiation. Herein, we studied the interactions between AA and hydroquinone (QH2) under steady-state and transient photochemical conditions to clarify the possible reactions and consequences if QH2 and AA coexist in a solution. Steady-state experimental results demonstrate that the interactions between AA and QH2 were strongly affected by dissolved oxygen. In O2-rich solutions, the phototransformation of QH2 was AA-independent. Both QH2 and AA utilize O2 as the electron acceptor, but in O2-insufficient solutions, AA became an important electron acceptor for the oxidation of QH2. In all cases, the coexistence of AA increased the phototransformation of QH2, whereas the decomposition of AA in O2-saturated and oversaturated solutions was inhibited by the presence of QH2. The underlying mechanisms were investigated by a combination of laser flash photolysis (LFP) and reduction potential analysis. The LFP results show that the excited AA serves as a better electron shuttle than QH2. As a consequence, AA might regulate the redox cycling of quinones, leading to significant effects on many processes, ranging from photosynthesis and respiration to photodegradation.
研究领域:
环境科学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2017
·
IF 5.099
Guoyang Zhang,Bingdang Wu,Shujuan Zhang
Acetylacetone (AcAc) has proven to be a potent photo-activator in the degradation of color compounds. The effects of AcAc on the photochemical conversion of five colorless pharmaceuticals were for the first time investigated in both pure and natural waters with the UV/H 2 O 2 process as a reference. In most cases, AcAc played a similar role to H 2 O 2 . For example, AcAc accelerated the photodecomposition of carbamazepine, oxytetracycline , and tetracycline in pure water. Meanwhile, the toxicity of tetracyclines and carbamazepine were reduced to a similar extent to that in the UV/H 2 O 2 process. However, AcAc worked in a way different from that of H 2 O 2 . Based on the degradation kinetics, solvent kinetic isotope effect , and the inhibiting effect of O 2 , the underlying mechanisms for the degradation of pharmaceuticals in the UV/AcAc process were believed mainly to be direct energy transfer from excited AcAc to pharmaceuticals rather than reactive oxygen species-mediated reactions. In natural waters, dissolved organic matter (DOM) played a crucial role in the photoconversion of pharmaceuticals. The role of H 2 O 2 became negligible due to the scavenging effects of DOM and inorganic ions. Interestingly, in natural waters, AcAc first accelerated the photodecomposition of pharmaceuticals and then led to a dramatic reduction with the depletion of dissolved oxygen. Considering the natural occurrence of diketones, the results here point out a possible pathway in the fate and transport of pharmaceuticals in aquatic ecosystems .
研究领域:
环境科学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Science-Water Research & Technology
·
2025
·
IF 3.1
Hongwei Sun,Zheng Li,Qiankun Du,Hanzhang Li,Hua Su,Jiamin Lin,Yuyi Zheng,Kaicong Cai,Shuangcheng Jiang,Changqing Liu,Chunshan Wu
The antibiotic residue in mariculture tailwater is an urgent environmental problem that needs to be addressed, and the development of effective treatment technologies is one of the solutions. Ferrate (Fe(Ⅵ))-acetylacetone (AA) has great potential for the degradation of antibiotics in mariculture tailwater. This study found that Fe(Ⅵ)-AA degradation of sulfadimethoxine (SDM) showed good results. When [Fe(Ⅵ)]0:[AA]0=8:1, the removal rate of SDM could reach 95.73% in 10 min, which is a 66.01% enhancement over the result of Fe(Ⅵ) alone. Under the actual mariculture tailwater conditions, Fe(Ⅵ)-AA still removed 77.9% of SDM in 10 min, which is still 36.4% higher than the degradation result of Fe(Ⅵ) alone, indicating that it has good potential for application. A series of quenching experiments showed that high-valent iron (Fe(V), Fe(Ⅳ)) was the main active substance in the degradation of SDM by Fe(Ⅵ)-AA. ECOSAR analysis showed that most of the by-products produced by Fe(Ⅵ)-AA degradation of SDM were at non-toxic and low-toxicity levels, proving that Fe(Ⅵ)-AA is a green and efficient water treatment technology.
研究领域:
环境科学
·
水产养殖学
·
药理学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 1
·194-199
·
IF 3.069
Wenda Wang,Xuerong Fan,Qiang Wang,Jin Xu,Lili Wang,Lipeng Liu,Xueming Bao
In this communication, acrylamide (AM) polymerisation to poly(acrylamide) was initiated by horseradish peroxidase (HRP) and acetylacetone (ACAC) without hydrogen peroxide (H2O2). Electron spin resonance (ESR) spectroscopy showed that free radicals of ACAC and AM were present in the reaction. Gel Permeation Chromatography (GPC), FT-IR, 1H-NMR and relative viscosity indicated that the product was PAM. Furthermore, the enzymatic cycling mechanism of the HRP–ACAC–H2O2 ternary system was also explained.
研究领域:
生物化学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2021
·Vol. 32
·期 9
·095114
·
IF 2.046
Qianchun Zhang,Yan Wang,Qin Zhou,Yafei Chen,Yuguo Zheng,Shan Tang,Yuxian Zhao,Li Jiang
Nonmetallic nanocatalysts have demonstrated powerful potential in cataluminescence (CTL) sensing fields. In this study, an original method for the fabrication of a CTL gas sensor was developed to detect acetylacetone based on nanosized hexagonal boron nitride (h-BN). The luminescence characteristics and optimum operating temperature, wavelength, and carrier gas flow rate parameters for the h-BN sensor were studied in detail. Compared with other common gases (such as cyclohexanone, acetaldehyde, and acetone), the fabricated sensor demonstrated a high selectivity and sensitivity toward acetylacetone. This was verified by density functional theory calculations, which were consistent with the experimental results. The CTL intensity and concentration of acetylacetone had a linear relationship in the range of 0.050–20 μg ml−1 (r = 0.9989) with a low detection limit of 16 ng ml−1 (S/N = 3). The developed sensor was applied to analyze spiked samples, and satisfactory recoveries for acetylacetone of 82.2%–118% were obtained with excellent reproducibility (2.8%–11%). These results indicated that the system has excellent sensing properties including a high selectivity, sensitivity, and stability, proving its broad application prospects for detecting acetylacetone.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Mihebai Yilimulati,Jiyuan Jin,Xin Wang,Xiaomeng Wang,Dmitry Shevela,Bing Wu,Kai Wang,Lang Zhou,Yunlu Jia,Bingcai Pan,Govindjee Govindjee,Shujuan Zhang
Selective inhibition of photosynthesis is a fundamental strategy to solve the global challenge caused by harmful cyanobacterial blooms. However, there is a lack of specificity of the currently used cyanocides, because most of them act on cyanobacteria by generating nontargeted oxidative stress. Here, for the first time, we find that the simplest β-diketone, acetylacetone, is a promising specific cyanocide, which acts on Microcystis aeruginosa through targeted binding on bound iron species in the photosynthetic electron transport chain, rather than by oxidizing the components of the photosynthetic apparatus. The targeted binding approach outperforms the general oxidation mechanism in terms of specificity and eco-safety. Given the essential role of photosynthesis in both natural and artificial systems, this finding not only provides a unique solution for the selective control of cyanobacteria but also sheds new light on the ways to modulate photosynthesis.
研究领域:
环境科学
·
微生物学
·
植物生理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Lu Li,Sihong Xu,Liang Jin,Wenxing Chen,Shichang Chen
It is essential to find a depolymerization system with good catalytic activity, easy operation, and high efficiency for the degradation of waste PET. The synergistic catalytic effect of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and zinc 2-ethylhexanoate (ZnEH) in PET glycolysis was investigated. Waste PET can be more efficient when completely degraded than single organocatalyst or zinc salt or previous DBU/Zn(OAc) 2 , and the yield of BHET reaches 84.1 % under optimal reaction conditions with the molar ratio of 2:1 of DBU to ZnEH and the weight ratio of 3:1 of EG to PET, the temperature of 180 °C and at 60 minutes. By combining experimental results with density functional theory (DFT) calculations, the synergistic enhancing degradation mechanism that generates hydrogen and coordination bonds is proposed. The purified depolymerization product of BHET was repolymerized to PET, delightfully the r-PET was almost identical to virgin PET.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Sihui Wu,Jianjun Wang,Liming Tao,Ruihua Fan,Cong Wang,Wei Sun,Zhiyong Gao
In the flotation separation of chalcopyrite and pyrite, the commonly used high-lime process often causes problems such as losses of precious metals, blockage in pipelines and environmental pollution. In this study, acetylacetone (AA) was used as a novel collector to separate chalcopyrite from pyrite without adding limes. The flotation results indicate that AA can selectively separate chalcopyrite from pyrite without depressants at pH 9.0. Flotation kinetics and entrainment calculations show that compared with potassium ethyl xanthate (KEX), AA reduces pyrite entrainment and produces the concentrate with a higher Cu grade and a higher separation efficiency. Solution chemistry calculations show that enolate (AAE - ) and ketone (AAK) are the dominant species of AA at pH 9.0. Contact angle measurements, zeta potential measurements and Fourier transform infrared (FTIR) analysis indicate that the dominant species of AA chemically adsorb onto chalcopyrite surfaces at pH 9.0 while the adsorption on pyrite is minimal. Density functional theory (DFT) analysis reveals that the Fe atoms on chalcopyrite are the active sites interacting with AA to form six-membered ring complexes. The selective adsorption of AA relies on the spatial distribution and reactivity of Fe atoms on the commonly exposed cleavage surfaces of chalcopyrite and pyrite. After surface relaxation, a layer of Fe atoms appears on the outermost layer of chalcopyrite (1 1 2) surface, which is beneficial for the adsorption of AA species while a layer of S atoms for pyrite (1 0 0) surface. The Fe (III) on chalcopyrite (1 1 2) surface has a higher reactivity than the Fe (II) on pyrite (1 0 0) surface, leading to a higher adsorption energy of AA species on the chalcopyrite. Therefore, this acetylacetone-based lime-free process has a great potential for industrial application in the separation of chalcopyrite from pyrite.
研究领域:
矿物加工工程
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）