Article
Energy & Fuels
Zixiao Liu, Yonglian Lu, Chunfen Wang, Yu Zhang, Xiaodie Jin, Junwei Wu, Youhe Wang, Jingbin Zeng, Zifeng Yan, Hongman Sun, Chunfei Wu
Summary: In this study, three calcium-based metal frameworks were used as precursors to obtain nano CaO through a two-step thermal transition process, and it achieved a fast adsorption capacity of 11.8 mmol g-1. The improvement in cyclic performance was attributed to the gradual transformation of the precursor structure into nanosheets, preventing further aggregation of CaO particles during thermal transition. Pore structure was found to have little influence on the adsorption performance, suggesting that high stability can be achieved by avoiding particle sintering. This study highlights the importance of precise tailoring of nano-CaO for CO2 fast adsorption.
Article
Engineering, Chemical
Fengtian Bai, Xin Liu, Suleiman Sani, Yumin Liu, Wei Guo, Chenggong Sun
Summary: A series of amine-functionalized CO2 sorbents were synthesized by grafting mono-and tri-amine substituted trialkoxysilanes on mesocellular siliceous foam (MCF) via a facile wet grafting method. The amine grafted MCF exhibited excellent CO2 adsorption capacity and stability, attributed to the large pore volume and pore size coupled with superior interconnectivity of MCF allowing more surface silanol groups available and accessible for amino silanes. These findings suggest that the porous structure and amine loading level play significant roles in enhancing both the CO2 adsorption capacity and adsorption rate of the developed sorbents.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Applied
Zaza Hazrina Hashim, Yasutaka Kuwahara, Aiko Hanaki, Abdul Rahman Mohamed, Hiromi Yamashita
Summary: Investigations have been conducted on the use of excess slag waste in the iron and steel making industries, leading to the development of a carbon dioxide (CO2) capturing adsorbent. Various analytical techniques were employed to determine the morphological and physicochemical characteristics of the synthesized samples, revealing that the adsorbent synthesized using formic acid exhibited the highest CO2 adsorption capacity and regenerative ability. This environmentally friendly and economical adsorbent with high adsorption and reuse capability is advantageous for reducing CO2 emissions from the industry and promoting its long-term sustainability.
Review
Chemistry, Multidisciplinary
Shishir Tiwary, Soubhik Kumar Bhaumik
Summary: This review discusses theoretical approaches in high-temperature CO2 capture using CaO-based sorbent, including thermodynamics, sorbent-level kinetic models, and column-level hydrodynamic models. The theoretical prediction of plant-level performance is crucial for design upscale.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Chemistry, Multidisciplinary
Xiaodong Ma, Xinning Song, Libing Zhang, Limin Wu, Jiaqi Feng, Shunhan Jia, Xingxing Tan, Liang Xu, Xiaofu Sun, Buxing Han
Summary: This study designed a Pb-doped Cu2O catalyst for efficient electrochemical CO2 reduction reaction (CO2RR), which could stabilize the Cu-0-Cu+ structure and enhance CO adsorption and C-C coupling, leading to high selectivity for C-2 products.
Article
Engineering, Environmental
Shuoyang Liang, Aikelaimu Aihemaiti, Yingying Cai, Yiping Su, Rui Li, Zewei Quan, Zuotai Zhang
Summary: Developing calcium-based sorbents for capturing and separating CO2 from high-temperature flue gas is a potential route to alleviate environmental problems caused by excessive CO2 emissions. However, the anti-deactivation mechanism of stable CaO materials during the cyclic adsorption-desorption process is not well-understood, making it difficult to design Ca-based materials.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Construction & Building Technology
Zhuohui Ma, Hongqiang Liao, Li Wang, Fangqin Cheng
Summary: The study shows that the addition of Fe2O3, Fe3O4, SiO2, MgO, and Al2O3 has an influence on the carbonation rate and efficiency of CaO, with synergistic effects observed with Fe2O3, Fe3O4, MgO, and Al2O3, while the effect with SiO2 is relatively small.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Environmental
Wenfei Yue, Chuigang Fan, Wenli Song, Songgeng Li
Summary: This study investigates the effects of different precipitated CaCO3 precursors on the physical properties and CO2 capture performance of CaO sorbents. The results show that the presence of additives affects the crystal composition and porosity of the CaCO3 precursor, and CaO sorbents derived from CaCO3 modified with 8 mmol/L CTAB exhibit higher CO2 capture capacity than other sorbents.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Chen Zhang, Xinqi Zhang, Tingyu Su, Yiheng Zhang, Liwei Wang, Xuancan Zhu
Summary: This review comprehensively assesses five different modification schemes, including acid/alkali/salt treatment, inert supports, functional groups, nanomaterials, and multi-phase sorbents, to provide insights into the mechanisms, performances, and commercial analysis for trace CO2 capture. The features of different schemes are compared and tabulated to guide sorption performance enhancement. Commercial assessments for TCC materials are conducted using a multivariable model, and future development of sorption performance enhancement schemes for low-concentration capture of CO2 is proposed.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Engineering, Environmental
Huangyu Yan, Guojie Zhang, Jun Liu, Guoqiang Li, Ying Wang
Summary: SBA-15 modified with Im showed improved CO2 adsorption efficiency and thermal stability, with the optimal formula achieving the highest CO2 adsorption capacity and energy. The results were validated through experimental testing and DFT calculations.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Metallurgy & Metallurgical Engineering
Li Shao-ying, Li Bin, Duan Sheng-chao, Zhao Xing-ming, Guo Jing, Guo Han-jie
Summary: Laboratory experiments were conducted to study the deoxidation of H13 tool steel using CaF2-MgO-Al2O3-CaO-SiO2 slags. The [Si]-[O] reaction was identified as the control reaction, with the limitation of deoxidation being the lowest for slags with a basicity of 2.0. The mass transport of oxygen in the metal phase was found to be the rate-controlling step, and the optimized slag composition led to a significant reduction in total oxygen content in the steel.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Engineering, Environmental
Yongqing Xu, Felix Donat, Cong Luo, Jian Chen, Agnieszka Kierzkowska, Muhammad Awais Naeem, Liqi Zhang, Christoph R. Mueller
Summary: This study investigates the effect of alkali metal salt promoter K2CO3 on the cyclic performance of CaO-based sorbents. It is found that low concentrations of K2CO3 significantly improve the cyclic performance of CaO, while high concentrations reduce the CO2 uptake performance. The stability of K2CO3 is influenced by the gas environment, with partial volatilization at high temperatures leading to a decrease in K content in the samples.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Xiaodong Ma, Xinning Song, Libing Zhang, Limin Wu, Jiaqi Feng, Shunhan Jia, Xingxing Tan, Liang Xu, Xiaofu Sun, Buxing Han
Summary: By doping lead into Cu2O catalyst, the local electronic structure of Cu can be modified to improve the efficiency of CO2RR reaction, converting CO2 to C-2 hydrocarbons and oxygenate. The experimental results showed that the lead-doped catalyst achieved a C-2 faradaic efficiency of 83.9% and a current density of 203.8 mA cm(-2) at -1.1 V vs. RHE in a flow cell. X-ray absorption spectroscopy and Raman spectroscopy revealed that lead doping stabilized the Cu-0-Cu+ structure, enhanced CO adsorption and C-C coupling, leading to high activity for C-2 product formation. Theoretical calculations also indicated that lead doping lowered the energy barrier for both CO2 activation and C-C coupling processes.
Article
Engineering, Chemical
Xiaobin Chen, Yuting Tang, Chuncheng Ke, Chaoyue Zhang, Sichun Ding, Xiaoqian Ma
Summary: This study proposed a novel method to improve the CO2 capture performance in high-temperature pyrolysis technology. By co-precipitation modification with Ca, Mg, and Zr metals, the modified calcium-based sorbents were successfully prepared. The results showed that under certain conditions, the modified sorbents could effectively reduce the CO2 concentration in the pyrolysis gas.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Engineering, Chemical
Yun Zhou, Hongyang Wang, Rong Zhu, Guangsheng Wei, Kai Dong
Summary: Valuable Cr and Fe in stainless steel dust (SSD) were extracted and recycled through direct reduction by molten iron. The reduction mechanism of Cr2O3 in the iron bath process was studied, and a recovery process was developed based on theoretical and experimental analyses.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Fengjiao Lai, Feng Yan, Yingqing Wang, Chunyan Li, Jianjun Cai, Zuotai Zhang
Summary: This study synthesized novel metal/Si-pillared montmorillonite supported phosphotungstic acid catalysts for efficient conversion of biomass-derived carbohydrates to alkyl levulinates. The effects of metal acidity, HPW contents, and reaction conditions on the catalytic performance were comprehensively studied, demonstrating promising results for the production of methyl levulinate.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Biotechnology & Applied Microbiology
Rigang Zhong, Jianjun Cai, Feng Yan, Qingcai Liu, Zuotai Zhang
Summary: The research indicates that combining a vertical economizer with an ash hopper can effectively remove PCDD/Fs from flue gas, with PCDD/Fs mainly originating from fine particles and de novo synthesis being the dominant formation pathway.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Engineering, Environmental
Yunhui Hua, Yongqi Sun, Feng Yan, Shubin Wang, Zhenghe Xu, Baojun Zhao, Zuotai Zhang
Summary: In this study, a simple and universal approach using ionization potential (IP) calculation assisted with cyclic voltammetry test was proposed for selecting organic acid as a reductant in deep eutectic solvent (DES) for recycling of spent lithium ion batteries (LIBs). The reducibility of organic acid was found to have a close relationship with the IP, and organic acids of lower IP were found to be more preferred as reductants. The designed DES from IP calculation was versatile for treating various kinds of spent battery cathodes and capable of multiple uses, reducing secondary chemical waste and pollution.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Green & Sustainable Science & Technology
Pengju Wang, Feng Yan, Jianjun Cai, Feng Xie, Xuehua Shen, Xuankun Wei, Guodong Yang, Rigang Zhong, Junbing Huang, Zhongzheng Li, Zuotai Zhang
Summary: This study found that the memory effect of wet scrubber system (WSS) in municipal solid waste incineration can enhance the emission of polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs). The adsorption/desorption process of PCDD/Fs inside WSS explains this memory effect.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Fengjiao Lai, Feng Yan, Pengju Wang, Fan Qu, Xuehua Shen, Zuotai Zhang
Summary: Efficient conversion of biomass-derived carbohydrates to alkyl levulinates is achieved using Ce-Si pillared montmorillonite clay heterostructures incorporating Wells-Dawson tungstophosphoric acid. The multifunctional catalyst exhibits high yield and conversion rates, with the DPW-CeSiM catalyst showing superior stability and recyclability compared to DPW-CeSiM-I. The catalyst's dual acid sites and porous structure contribute to its efficient catalytic performance in converting various biomass-derived sugars into ethyl levulinate.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Xuehua Shen, Feng Yan, Chunyan Li, Fan Qu, Pengju Wang, Shiyin Zhao, Zuotai Zhang
Summary: In this study, amine-functionalized nano-Al2O3 adsorbent with high CO2 uptake and stable cyclic stability was synthesized by expanding the pores of nano-Al2O3 support through azeotropic distillation method. Water vapour was found to promote CO2 adsorption and inhibit the formation of urea compounds, improving the cyclic stability of the adsorbent.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Jingjing Chen, Aikelaimu Aihemaiti, Yu Xia, Feng Yan, Zuotai Zhang
Summary: The study found that pyrochar prepared with Ca-based additives can enhance soil phosphorus content, improve soil organic matter content, and promote the growth of ryegrass. Different treatment groups displayed distinct soil microbial community structures, with Ca-aided groups showing reduced accumulation of metal Pb in plant shoots.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Aikelaimu Aihemaiti, Jingjing Chen, Yunhui Hua, Chunling Dong, Xuankun Wei, Feng Yan, Zuotai Zhang
Summary: It was found that pristine biochar is not effective in immobilizing vanadium in contaminated soil, but ferrous sulfate-modified sludge biochar shows good potential in immobilizing vanadium in V-contaminated soil from a mining area. This modified biochar can reduce the leachability and bioavailability of vanadium in the soil, while increasing its reducible and oxidizable fractionation, thus reducing the uptake of vanadium by plants. The efficient immobilization of vanadium in the soil is attributed to the combined effects of decreased soil pH, adsorption and precipitation by elevated iron concentrations, increase in organic matter content, and microbial reduction.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Multidisciplinary
Wang PengJu, Yan Feng, Xie Feng, Cai JianJun, Shen XueHua, Wei XuanKun, Huang JunBin, Li ZhongZheng, Zhong RiGang, Zhang ZuoTai
Summary: This study comprehensively investigated the effect of selective catalytic reduction system on the level of polychlorinated dibenzo-p-dioxins and furans generated from municipal solid waste incineration. The results showed that the SCR system significantly reduced the concentration of PCDD/Fs and provided operating suggestions for achieving ultra-low emissions.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Article
Green & Sustainable Science & Technology
Fan Qu, Feng Yan, Xuehua Shen, Chunyan Li, Heijin Chen, Pengju Wang, Zuotai Zhang
Summary: This study proposes a novel eco-friendly method to achieve efficient and stable solid amine adsorbents. A calcium silicate hydrate (CSH) support with high pore volume is synthesized from coal fly ash (CFA) and then PEI@CSH adsorbents are prepared. The adsorbent exhibits high adsorption capacity, excellent cyclic stability, and low cost, making it applicable for CO2 mitigation in coal-fired power plants.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Xuankun Wei, Feng Xie, Chunling Dong, Pengju Wang, Jiyun Xu, Feng Yan, Zuotai Zhang
Summary: Geopolymers were prepared using alkali-activation technology to stabilize heavy metals in hazardous waste incineration fly ash (HFA). Water-washing treatment was conducted to remove soluble salts. The results showed that geopolymers met the standard limits and efficiently inhibited heavy metal leaching.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Chemistry, Physical
Xuankun Wei, Yongqi Sun, Yiping Su, Xuehua Shen, Yuanyuan Tang, Feng Yan, Zuotai Zhang
Summary: Geopolymers were synthesized incorporating Pb2+ and Cd2+ to investigate their solidification mechanisms. Leaching analyses showed that Pb2+ had higher solidification efficacy compared to Cd2+. The difference in solidification mechanisms can be attributed to variances in ionic potential and covalent interactions between the cations. This research provides novel insights into the mechanisms involved in solidifying heavy metals in geopolymers.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Environmental
Pengju Wang, Feng Xie, Feng Yan, Xuehua Shen, XuanKun Wei, Fan Qu, Yiping Su, Rigang Zhong, Zhongzheng Li, Zuotai Zhang
Summary: Traditional strategies for controlling PCDD/Fs emission in MSW incineration focus on transferring PCDD/Fs to fly ash, neglecting the reduction in PCDD/F generation. In this study, thiourea, an N-S-based inhibitor, achieved significant inhibition efficiencies on PCDD/Fs in flue gas and fly ash. The inhibition mechanism involved inhibition of de novo synthesis in flue gas and blocking of precursor reaction in fly ash. The gradual release of SO(2) and NH3 from thiourea contributed to the inhibition effect, while particle aggregation in fly ash also played a role in PCDD/F generation inhibition.
ACS ES&T ENGINEERING
(2023)
Article
Engineering, Environmental
Xuankun Wei, Ningning Shao, Feng Yan, Pengju Wang, Feng Xie, Zuotai Zhang
Summary: The addition of metakaolin as an aluminosilicate source can significantly improve the compressive strength and heavy metal immobilization efficiency of geopolymers derived from municipal solid waste incineration fly ash, while reducing the dosage of alkaline activator.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Xuehua Shen, Feng Yan, Chunyan Li, Zhen Zhang, Zuotai Zhang
Summary: This study developed a green and economical method to prepare nano-SiO2 supports and silica-based solid amine adsorbents for biogas upgrading. The synthesized 40%-PEI@SiO2-6% adsorbent showed excellent CO2 adsorption performance and cycling stability, indicating promising potential for practical applications in biogas upgrading.
SUSTAINABLE ENERGY & FUELS
(2021)