SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Ze Yang,Songding Guo,Zhenglai Huan,Yongbing Zhu,Tingting Zhang,Shangyi Li
In this study, we dexterously constructed a unique in situ interface oxidation–adsorption dual-reaction platform through the self-excitation of ferrate (Fe(VI))/peroxymonosulfate (PMS) for phenylarsonic acid (PAA) and inorganic As(V) removal. When the molar ratio of Fe(VI)/PMS was 1:2, 80% degradation of PAA could be achieved within 180 min and the apparent constant value of the reaction rate ( k obs ) would reach up to 0.185 min −1 . 1 O 2 and Fe(IV) were the main active species for degradation of PAA in Fe(VI)/PMS reaction system. In addition, we explored the possible degradation intermediates and pathway of PAA. In situ Fe(III) oxides generated from Fe(VI) decomposition could adsorb arsenic pollutants through ligand exchange with inorganic As(V) through surface hydroxyl groups to form Fe-O-As bonds. The effect of coexisting anions on the removal performance of the system was investigated, and the results showed that the presence of PO 4 3− and CO 3 2− promoted the oxidative degradation of PAA owing to the activation of PMS by PO 4 3− and CO 3 2− , but Cl − can inhibit the PAA degradation through a free radical scavenging mechanism. PO 4 3− and SiO 3 2− affected the adsorption and removal of the released inorganic As(V) due to their competitive adsorption of in situ Fe(III) oxides. Density functional theory (DFT) calculations indicated an obvious electron transfer (1.83 e) between the in situ Fe(III) oxides and inorganic As(V) with a high adsorption energy of −10.30 eV. These results indicate that the combination of Fe(VI) and PMS can effectively control the total arsenic (total-As) in water bodies.
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DOI
高影响因子
ENVIRONMENTAL POLLUTION
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2022
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IF 9.988
Lulu Wang,Laihong Shen,Yuyang Long,Dongsheng Shen,Shouxi Jiang
Uncoupling chemical looping gasification (CLG), the organic sulfur evolution was simulated and explored qualitatively and quantitatively using typical sulfur compounds on TG-MS and temperature-programmed fixed bed. The HS radical in the reductive atmosphere easier converted to H 2 S and COS. H 2 O activated the evolution of S which was stably bonded to carbon, and H 2 generated from gasification and oxidation of reductive Fe by H 2 O contributed to the release of sulfur. The proportion of H 2 S released from sulfur compounds was greater than 87% in steam gasification, and more than 60% during CLG. Oxygen carriers promoted the conversion of sulfur to SO 2 in the mid-temperature region (500 °C–700 °C), and H 2 S in the high temperature region (700 °C–900 °C). Sulfur species played a pivotal role in sulfur evolution at low temperature of CLG. The organic sulfur in mercaptan and benzyl were more easily converted and escaped than in thiophene and phenyl . The thermal stability of sulfur species, the presence of steam and OC affected the initial temperature and peak concentration of gas sulfur release as well as sulfur distribution. Consequently, CLG strengthened the sulfur evolution, and made it possible to targeted restructure the distribution of sulfur by regulating process parameters, or blending fuel with different sulfur species for emission reduction, and selective conversion of sulfur.
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DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
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IF 4.7
Yang Yang,Xinru Liu,Yilin Luo,Zhipeng Fan,Xiao Ling,Shuyu Yang,Zhaomeng Liu,Xiangtai Meng,Ying Liu,Xiaohui Wang,Jinrong Bao
We report ultraviolet stimuli-responsive and transmittance-tunable films containing diphenyl sulfoxide rare earth complex for luminescence and optical anti-counterfeiting. The films are a small amount of diphenyl sulfoxide rare earth complex. The low dose of the rare earth complex still emitted strong luminescence intensity in the fibrous films. The fibrous nature of the films makes them flexible, tailorable, printability, and uniform distribution of luminescence rare earth complex, while the incorporation of PAN make the TPU film with tunable transmittance. The obtained hybrid flexible film shows strong red and green anti-counterfeiting performance under UV light stimulation due to a perfect match between the triplet energy level of DPhSO and the excited energy level of rare earth ions (Tb, Sm, Eu). Notably, the fibrous films offer multiple anti-counterfeiting modes, providing a range of verification options. This work demonstrated a low-cost and effective way to prepare anti-counterfeiting film, making them highly promising for practical anti-counterfeiting applications.
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高影响因子
ORGANIC PROCESS RESEARCH & DEVELOPMENT
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2025
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IF 3.5
Hongrui Zhang,Feng Xu,Xiang Zhou,Zhiquan Chen,Juncheng Jiang,Gang Fu,Lei Ni
The oxidation of diphenyl sulfide (DPS) by hydrogen peroxide (H2O2) to synthesize diphenyl sulfoxide (DPSO) is extremely exothermic and has a high thermal risk. When thermal runaway happens, it may lead to equipment damage or even explosions. Therefore, in this work, a microreactor was adopted to reduce reaction thermal risk and process conditions were optimized. Phosphotungstic acid (PTA) was used as the catalyst, and the effects of process conditions, including reaction temperature, residence time, catalyst concentration, and molar ratio on the conversion and yield were systematically investigated. The results showed that the DPSO yield could reach up to 84.3% under the condition of 0.75% catalyst loading, 25 min residence time, 70 °C reaction temperature, and H2O2–DPS molar ratio of 2. Then, apparent reaction kinetics were studied, and a kinetic model was established and validated. By varying the initial concentrations of H2O2 and DPS, the reaction was determined to be of second-order, with an activation energy of 57.5 kJ·mol–1 and a pre-exponential factor of 2.96 × 107 mol–1·L·min–1. Furthermore, the temperature distribution along the microreactor was estimated by combining the thermal equilibrium with the reaction kinetics. The results indicated that in a 1/16 in. microreactor, the reaction was nearly isothermal. Temperature distributions were also predicted for microreactors with different diameters and materials. It was demonstrated that the reaction could be safely scaled up to a 3/8 in. microreactor at a reaction temperature of 55 °C, with the maximum temperature rise remaining below 5 °C and no decline in DPSO yield. This study provided a convenient method to guide the safe sizing-up of the reaction in flow reactors.
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高影响因子
iScience
·
2025
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IF 4.1
Zhiwei Meng,Zirui Peng,Yupeng Yan,Qin Zhang,Yang Li
Photocatalytic technology is currently one of the most effective methods for removing tetracycline (TC) from the environment; however, the underlying photocatalytic mechanism remains unclear. In this study, zinc oxide quantum dots (ZnO-QDs)/hollow-sphere g-C 3 N 4 (CNHS) S-scheme heterojunction photocatalysts were synthesized for the photocatalytic degradation of tetracycline. Experimental results showed that the 7% ZnO-QDs/CNHS photocatalyst exhibited excellent TC degradation efficiency, with a removal rate of 80.2% within 15 min. Through free radical conversion pathway analysis, singlet oxygen ( 1 O 2 ) was identified as the primary active species responsible for tetracycline degradation. Further calculations indicated that the combination of holes (h + ) and superoxide radicals (O 2 − ) produces 1 O 2 , accounting for 83.28% of the total contribution. These findings provide theoretical support for 1 O 2 as the primary active species in pollutant degradation.
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DOI
PubMed
高影响因子
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