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Synergistic scale inhibition of polyaspartic acid composite with magnetic field

LIU Zhenfa, WANG Yanji, GAO Yuhua, ZHANG Lihui

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 3, Pages 261-265 doi: 10.1007/s11705-007-0047-z

Abstract: The scale inhibition of PASP composite and the effect of its synergism with a magnetic field on scaleand dynamic experiments show that the chelating function of PASP composite for Ca can be enhanced by synergism

Keywords： synergism magnetic PBTCA dynamic acid–acrylic acid–acrylic

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Benzene degradation in waste gas by photolysis and photolysis-ozonation: experiments and modeling

Fariba Mahmoudkhani, Maryam Rezaei, Vahid Asili, Mahsasadat Atyabi, Elena Vaisman, Cooper H. Langford, Alex De Visscher

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 6, doi: 10.1007/s11783-016-0876-4

Abstract: A photochemical model of benzene degradation compares well with experimental data obtained in the Lab. 62 reactions were needed to fully describe benzene degradation. A feasibility study shows that the photolysis of benzene is a cost-effective process. Experimental data and modeling results show that the degradation efficiency will increase when the combination of UV light and ozone is used. The degradation of benzene, a carcinogenic air pollutant, was studied in a gas-phase photochemical reactor with an amalgam lamp emitting ultraviolet light at 185 and 254 nm. Efficient benzene degradation (>70%) was possible for benzene mass flow rates of up to 1.5 mg·min . Adding ozone allowed benzene mass flow rates of up to 5 mg·min to be treated with the same efficiency. In terms of energy consumption, ozone doubles the efficiency of the process. A comprehensive mechanistic simulation model was developed incorporating a chemical kinetics model (62 reactions involving 47 chemical species), a material balance model incorporating diffusion and flow, a flow velocity model, and a light field model. The model successfully predicted the efficiency of the reactor, generally within 20%, which indicates that the model is sound, and can be used for feasibility studies. The prediction of the reactor efficiency in the presence of ozone was less successful, with systematically overestimated efficiency. Condensation of reaction products in the reactor is thought to be the main cause of model inaccuracy. Both experimental data and model predictions show that there is a synergistic effect between ozonation and ultraviolet degradation.

Keywords： Photolysis Ozone Benzene Waste gas Simulation Synergism

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Controllable construction of ionic frameworks for multi-site synergetic enhancement of CO₂ capture

Yuke Zhang;Hongxue Xu;Haonan Wu;Lijuan Shi;Jiancheng Wang;Qun Yi

Frontiers of Chemical Science and Engineering 2024, Volume 18, Issue 1, Pages 4-4 doi: 10.1007/s11705-023-2370-4

Abstract: CO₂ capture is one of the key technologies for dealing with the global warming and implementing low-carbon development strategy. The emergence of ionic metal-organic frameworks (I-MOFs) has diversified the field of porous materials, which have been extensively applied for gas adsorption and separation. In this work, amino-functionalized imidazolium ionic liquid as organic monodentate ligand was used for one step synthesis microporous Cu based I-MOFs. Precise tuning of the adsorption properties was obtained by incorporating aromatic anions, such as phenoxy, benzene carboxyl, and benzene sulfonic acid group into the I-MOFs via a facile ion exchange method. The new I-MOFs showed high thermal stability and high capacity of 5.4 mmol·g^–1 under atmospheric conditions for selective adsorption of CO₂. The active sites of microporous Cu-MOF are the ion basic center and unsaturated metal, and electrostatic attraction and hydroxyl bonding between CO₂ and modified functional sulfonic groups are responsible for the adsorption. This work provides a feasible strategy for the design of I-MOF for functional gas capture.

Keywords： carbon dioxide capture micropores ionic liquids multi-site synergism ionic metal-organic frameworks