Article
Engineering, Chemical
Zijing Zhang, Yu Feng, Junna Wang, Weiwei Zhang, Feng Yun, Jintao Guo
Summary: A kinetic evaluation method of microwave liquid-phase desorption mechanism was established in this study, showing that an increase in microwave power could decrease the pre-exponential factor and activation energy, leading to an acceleration of the reaction rate. Microwave desorption rate was higher and temperature was lower compared to thermal desorption.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Review
Metallurgy & Metallurgical Engineering
Dong-xiang Meng, Ru-fei Wei, Fei-hu Zhang, Hong-ming Long, Yuan-yuan Zhou
Summary: Calcium-based desulfurization ash (CDA) is mainly produced through dry and semi-dry flue gas desulfurization processes. Its main component, calcium sulfite, makes CDA unstable and unsuitable for direct use in building materials. CDA can be modified through high-temperature oxidation and wet oxidation, and the modified CDA can be widely used in building materials. Hydrothermal oxidation shows great potential as it allows for the oxidation of CDA and the removal of impurities simultaneously. CDA can be used to produce high value-added products such as calcium sulfate whiskers and ecological rubber fillers.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2023)
Article
Biochemistry & Molecular Biology
Julieta Paez, Adrian de Miguel-Jimenez, Rocio Valbuena-Mendoza, Aditi Rathore, Minye Jin, Alisa Glaser, Samuel Pearson, Aranzazu del Campo
Summary: In this study, the reactivity of the MS partner's heteroaromatic ring was optimized to slow down cross-linking kinetics and degradation of hydrogels. New MS substrates based on Tz and Bt rings were synthesized via simple pathways, extending the working time of precursor mixtures and allowing longer term cell culture. The Tz-based MS substrate was identified as the best candidate, supporting cell cultures for over 2 weeks.
Article
Engineering, Environmental
Gang Wang, Shirun Zhao, Haoyu Yao
Summary: The co-production of dimethyl carbonate (DMC) and ethylene glycol (EG) via transesterification of ethylene carbonate (EC) has been studied using metal chloride-based ionic liquids (ILs) as catalysts. The interaction between cation and methanol, as well as the activation of carbonyl group in EC by metal chloride-contained anion, showed synergistic effects on catalytic transesterification. The reaction rates were affected by the steric hindrance effect of the alkyl group substituted at the N atom in the imidazole ring. The Al2Cl7 species in AlCl3-based IL exhibited activity in the transesterification, and its content showed a linear relationship with the transformative rates of both EC and HEMC. The kinetic studies revealed that the reaction rates were first-order dependent on the concentrations of EC (or HEMC) and methanol, and the formation of HEMC intermediate was the kinetic-relevant step. The catalysis of [MDMIM]Cl/AlCl3 with an AlCl3 molar fraction of 0.67 showed higher performance compared to other metal chloride-based ILs, with a yield and selectivity of DMC (or EG) reaching up to 95% and 97%, respectively, after 12 hours of reaction at 140 degrees C. The IL also demonstrated good recyclability without decay in catalytic activity and selectivity after 10 times' recycling.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Di Zhou, Rufei Wei, Yulong Zhu, Hongming Long, Bangfu Huang, Yifan Wang, Shoucang Wu
Summary: The one-step preparation of calcium sulfate whiskers from flue gas desulfurization ash was successfully achieved using a hydrothermal method, with control of temperature, time, and speed parameters being crucial. Adding a medium solution purification link in the hydrothermal system contributes to the production of high-quality calcium sulfate whiskers products.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Tong Li, Ting Su, Jiang Wang, Suiyi Zhu, Yuxin Zhang, Zhi Geng, Xianze Wang, Yidi Gao
Summary: A facile low-temperature thermal route was developed to treat the acidic and highly saline flue gas wastewater concentrate generated from desulfurization wastewater in power/heating plants. The method effectively removed sulfate and nitrate from the concentrate without generating any hazardous waste, and produced recycled water and value-added natroalunite particles.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Multidisciplinary
Antonio Jaime-Azuara, Thomas Helmer Pedersen, Reinhard Wimmer
Summary: Chemical recycling of polymers to monomers and chemicals has the potential to minimize resource consumption and reduce CO2 impact. Solvolytic depolymerization of PET is a selective process that maximizes monomer recovery, but optimization challenges remain. Subcritical water has shown promise as a green solvent for PET depolymerization, and new NMR quantification methods have allowed for more accurate product characterization.
Article
Green & Sustainable Science & Technology
Qiuming Wang, Walter Wilfong, Brain Kail, Tuo Ji, Fan Shi, McMahan Gray
Summary: In this study, a water stable polyethylenimine-n,n'-methylenebisacrylamide (PEI-MBAA) functionalized SiO2 solid sorbent material was developed for the removal of heavy metal pollutants from flue gas desulfurization (FGD) wastewater. The material exhibited excellent metal adsorption kinetics, selectivity, regenerability, and space velocity. The results showed high adsorption efficiency for trace-level heavy metals in authentic industrial FGD wastewater and good reusability after five consecutive adsorption-desorption cycles. This sorbent is a promising candidate for the removal of heavy metals from practical aqueous solutions.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Materials Science, Multidisciplinary
Behruz Mirzayi, Hadi Basharnavaz, Aziz Babapoor, Hossein Kamali, Ali Khodayari, Shabnam Sohrabnezhad
Summary: In this study, aluminum terephthalate metal-organic framework (AlTp) and its nanocomposites with graphene oxide (AlTp/GO) and iron oxide (AlTp/Fe2O3) were synthesized and used as inhibitors to protect AM60B magnesium alloy from corrosion. Characterization of the components was performed using FTIR, XRD, and SEM. The inhibition efficiencies of the components were investigated, with AlTp/GO showing the highest inhibition efficiency. The results indicated that the incorporation of nanoparticles improved the inhibition performance of AlTp, as confirmed by polarization data. Adsorption isotherm and Gibbs free energy of the adsorption process were also determined and discussed.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Energy & Fuels
Hanyu Deng, Wenzhen Cai, Lanhe Zhang, Yanping Jia, Xiaoqiang Wang, Qing Zong, Guishi Cheng, Xiaoying Hu, Changqing Dong, Ying Zhao
Summary: The dry desulfurization technology of activated coke/carbon (AC) adsorption has been widely applied, especially in the industry that requires the feedstock H2SO4. This work conducted temperature-programmed experiments to study the thermal regeneration of spent activated carbon in flue gas desulfurization, focusing on the dominant reaction between adsorbed H2SO4 and carbon: 2H(2)SO(4) + C -> CO2 + 2H(2)Ogas + 2SO(2). The inhibitory effect of H(2)Ogas on regeneration was verified for the first time, which is useful for reducing carbon consumption.
Article
Environmental Sciences
Jingfeng He, Mingming Zhang, Hao Chen, Shulian Guo, Lingtao Zhu, Jiang Xu, Kui Zhou
Summary: The study enhanced the leaching efficiency of copper from WPCBs by using EG and found that the leaching mechanism of copper conformed to a specific model. The results indicated that adding EG could improve the stability of H2O2 and the electrical activity of WPCBs, thereby enhancing the leaching of copper.
Article
Chemistry, Physical
Yixuan Cao, Changjun Zou, Chengjun Wang, Hao Liang, Wenjing Chen, Wenjing Li
Summary: The study demonstrated that the addition of TiO2 nanoparticles and sodium dodecyl benzene sulfonate (SDBS) can significantly inhibit the corrosion of 3003 aluminum alloy in aqueous ethylene glycol containing chloride ions, and protect the alloy from damage.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Multidisciplinary Sciences
Shiqing Wang, Shisen Xu, Shiwang Gao, Ping Xiao, Minhua Jiang, He Zhao, Bin Huang, Lianbo Liu, Hongwei Niu, Jinyi Wang, Dongfang Guo
Summary: Under cold temperatures, the presence of oxygen enhances the adsorption capacity of NO on activated carbon. The adsorption capacity of SO2 is also significantly increased at low temperatures. A novel low-temperature adsorption (LAS) process is developed for simultaneous removal of SO2 and NOx from flue gas.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Prasenjit Singha, Ajay Kumar Shukla
Summary: The simulation of the basic oxygen steelmaking process was conducted using a 3-reactor model that considered transient compositions, temperature, and weight of liquid steel and slag. The kinetics of scrap dissolution and refining reactions were incorporated, and the predictions of the model aligned well with the plant data regarding the removal of carbon, silicon, and phosphorus.
Article
Chemistry, Multidisciplinary
Farah Abu Hatab, Omar A. Z. Ibrahim, Samah E. E. Warrag, Ahmad S. Darwish, Tarek Lemaoui, M. Mujahid Alam, Taghreed Alsufyani, Violeta Jevtovic, Fawzi Banat, Shadi W. Hasan, Inas M. AlNashef, Byong-Hun Jeon, Yacine Benguerba
Summary: Deep eutectic solvents (DESs) have potential as solvents for various applications, but their recovery is influenced by economic and environmental factors. This study investigated the recovery of methyl triphenyl phosphonium bromide/triethylene glycol (MTPPB/TEG 1:4) after de-aromatization, desulfurization, and denitrogenation of fuels. The results showed that washing the DES with distilled water was more effective than stripping with n-heptane. Increasing the DES-to-regeneration solvent mass ratio and the number of wash cycles improved recovery. The regenerated DES exhibited similar extraction effectiveness to fresh DES.