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Toward net-zero cement: linking demand-side measures with plant-level technology strategies

Resources, Conservation and Recycling 2025年 220卷

作者： Song, Xinke An, Kangxin Wang, Rui Liu, Gang Wang, Can State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Department of Earth System Science Tsinghua University Beijing100084 China College of Urban and Environmental Sciences Peking University Beijing100871 China Institute of Carbon Neutrality Peking University Beijing100871 China

Achieving climate goals in the cement sector requires combining supply- and demand-side strategies. To explore this interplay, this study develops a spatially explicit modeling framework that integrates sectoral decarbonization pathways and plant-level optimization. Results show that, in 2060, incorporating demand-side measures—compared to relying solely on supply-side technologies—reduces required carbon capture and storage (CCS)-equipped clinker capacity from 941.9 to 353.8 Mt/year, inter-provincial CO₂ transport from 182.6 to 41.7 Mt/year, and mitigation costs from 246 to 217 CNY/tCO₂. These measures also enable net-negative emissions of -69.0 Mt CO₂/year. Spatial analysis highlights Henan, Hebei, Sichuan, and Anhui provinces as priority regions for CCS deployment across all scenarios, reflecting the existing industrial structure and proximity to geological storage sites. These findings offer practical insights for optimizing plant-level technology choices, strengthening regional coordination, and advancing integrated mitigation policy development. © 2025

关键词： Carbon capture and storage Cement industry Demand-side transformation Net-zero Spatial optimization

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Waste photovoltaic wafers-derived SiC-based photocatalysts for pharmaceutical wastewater purification: S-scheme, waste utilization, and life cycle assessment

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Resources, Conservation and Recycling 2025年 220卷

作者： Teng, Chengyao Huang, Qing Cheng, Yunyan Zhang, Zhongyi Zhang, Li Zhu, Jianming Xu, Lijun Song, Qingbin Bian, Zhenfeng Li, Jinhui Yuan, Wenyi School of Resources and Environmental Engineering Shanghai Polytechnic University No. 2360 Jinhai Road Shanghai201209 China Macao Environmental Research Institute Macau University of Science and Technology Macao999078 China MOE Key Laboratory of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials Shanghai Normal University Shanghai200234 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Waste photovoltaic (PV) wafers recovered from modules by physical crushing contain high levels of impurities and are unsuitable for reuse. This research demonstrates the successful regeneration of SiC (r-SiC) nanowires photocatalysts from these discarded PV wafers. The r-SiC exhibits enhanced photoactivity and reduces environmental emissions compared to market SiC, as evidenced by a life cycle assessment. By synthesizing ZnxCd1-xS/r-SiC (ZxC1-xSS) photocatalysts featuring a S-scheme heterojunction and internal electric field (IEF)-driven •OH production capability, we have not only repurposed waste but also achieved an unprecedented leap in photocatalytic efficiency. The resulting 20 %Zn0.2Cd0.8S/r-SiC (20Z0.2C0.8SS) photocatalyst exhibited a remarkable 96.67 % cefaclor (CEC) degradation efficiency under visible light within 30 min—outperforming r-SiC by 126-fold and Zn0.2Cd0.8S by 44-fold, and enabling efficient pharmaceutical wastewater degradation. This pioneering research not only turns waste into a valuable resource but also establishes a new benchmark in photocatalytic technology, providing profound insights into the mechanisms underpinning ZxC1-xSS photocatalysts. © 2025

关键词： Photocatalysts

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A pH-responsive production of hydroxyl radical in Fenton process

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environmental Science and Ecotechnology 2025年 25卷

作者： Wang, Pengyi Kang, Fan Huang, Xiangbin Luo, Zhipeng Zou, Jing Yang, Min Sun, Meng Yu, Xin Zeng, Huabin College of the Environment & Ecology Xiamen University Xiamen 361102 China Fujian Key Laboratory of Coastal Pollution Prevention and Control Xiamen University Xiamen 361102 China Xiamen Key Laboratory of Municipal and Industrial Solid Waste Utilization and Pollution Control College of Civil Engineering Huaqiao University Fujian Xiamen 361021 China State Key Laboratory of Urban Water Resource and Environment School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Shenzhen 518055 China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Efficient management of temporal latency and spatial heterogeneity remains a critical challenge in sensor-based pH regulation for smart water management, primarily due to inherent response delays and mass transfer constraints. In oxidation systems with dynamic pH environments, delayed responses can lead to issues such as cyanide release, unwanted side reactions, or pipe damage. To address these challenges, we propose a “pause-then-adjust” control strategy, exploiting the pH-responsive generation of hydroxyl radicals (^•OH) in a modified Fenton reaction system. This system utilizes hydroxylamine as an electron donor and ethylenediaminetetraacetic acid (EDTA) as a stabilizer for iron ions. Within the pH range of 7.0–10.0, the coexistence of [Fe²⁺-EDTA]²⁻ and [Fe³⁺-OH-EDTA]²⁻ complexes facilitates efficient electron transfer, resulting in the selective and sustained production of ^•OH radicals. The inherent pH-responsiveness of this strategy enables rapid and spatially coherent adjustments, offering a robust supplementary method for addressing complex and evolving requirements in advanced water treatment systems. © 2025 The Authors

关键词： EDTA Fenton process Hydroxyl radical Hydroxylamine pH-responsiveness

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The production of formaldehyde and hydroxyacetone in methacrolein photooxidation: New insights into mechanism and effects of water vapor

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Journal of environmental Sciences 2018年第4期30卷 1-11页

作者： Yanan Xing Huan Li Liubin Huang Huihui Wu Hengqing Shen Zhongming Chen State Key Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University

Methacrolein（MACR） is an abundant multifunctional carbonyl compound with high reactivity in the atmosphere. In this study, we investigated the hydroxyl radical initiated oxidation of MACR at various NO/MACR ratios（0 to 4.04） and relative humidities（＆lt; 3% to80%） using a flow tube. Meanwhile, a box model based on the Master Chemical Mechanism was performed to test our current understanding of the mechanism. In contrast to the reasonable predictions for hydroxyacetone production, the modeled yields of formaldehyde（HCHO） were twice higher than the experimental results. The discrepancy was ascribed to the existence of unconsidered non-HCHO forming channels in the chemistry of CH3-UC（=CH2）OO, which account for approx. 50%. In addition, the production of hydroxyacetone and HCHO were affected by water vapor as well as the initial NO/MACR ratio. The yields of HCHO were higher under humid conditions than that under dry condition. The yields of hydroxyacetone were higher under humid conditions at low-NOx level, while lower at high-NOxlevel. The reasonable explanation for the lower hydroxyacetone yield under humid conditions at high-NOx level is that water vapor promotes the production of Umethacrolein nitrate in the reaction of HOCH2 C（CH3）（OO）CHO with NO due to the peroxy radical-water complex formation, which was evidenced by calculational results. And the minimum equilibrium constant of this water complex formation was estimated to be 1.89 × 10 （-18） cm3/molecule. These results provide new insights into the MACR oxidation mechanism and the effects of water vapor.

关键词： Methacrolein Formaldehyde Hydroxyacetone NOx Water vapor Peroxy radical

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Graphene-Diyne-Supported Single Transition Metal Atom Catalysts for Co₂ Capture and Co₂ Hydrogenation Conversion

SSRN

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SSRN 2025年

作者： Zhang, Runze Niu, Xiaowei Chen, Zhen Ding, Juan Wang, Chengxin Tang, Yixuan Hou, Yongxia Huang, Jiayi Wang, Yun College of Environment Liaoning Province Pollution Environmental Remediation Technology Innovation Center Liaoning Key Laboratory of Clean Energy and Carron-Neutral Technology Shenyang University Shenyang110044 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Jiaxing Nanhu University School of Mechanical and Electrical Engineering Zhejiang314001 China Shenyang University China

The rising concentration of carbon dioxide (CO₂), a significant greenhouse gas, demands efficient strategies for its capture and conversion into valuable chemicals. Traditional catalysts face challenges like low efficiency and poor selectivity in CO₂ reduction reactions (CO₂RR). This study uses first-principles calculations to explore graphene-diyne (GDY) supported single-atom transition metal catalysts (Ni, Fe, Mo, Ru) for CO₂ capture and hydrogenation. The results show that Ru@GDY demonstrates the highest catalytic activity with strong CO₂ adsorption energy (-0.82 eV) and efficient pathways for producing methane (CH₄) and methanol (CH₃OH). Mo and Fe also exhibit stable structures and significant potential for CO₂ activation. Analysis of bandgap tuning, charge transfer, and reaction intermediates (*HCO, *COH) reveals how metal-carbon bonding enhances catalyst performance. This research advances the understanding of single-atom catalysts and provides insights for designing efficient systems for CO₂ capture and conversion, contributing to sustainable energy solutions © 2025, The Authors. All rights reserved.

关键词： Hydrogenation

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simulation of organic nitrates in Pearl River Delta in 2006 and the chemical impact on ozone production

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Science China Earth Sciences 2018年第2期61卷 228-238页

作者： CHEN XiaoRui WANG HaiChao LU KeDing State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University

Organic nitrates are secondary atmospheric pollutants that play a key role in ozone and aerosol production. This study focused on the simulation of organic nitrates through a box model coupled with RACM2 （Regional Atmospheric Chemistry Mechanism, version 2）, based on data from the PRIDE-PRD2006 campaign in Backgarden, China. Our study found that an overestimation of organic nitrate production rate was generated by the model. Furthermore, the effective production ratio （a^ff） of organic nitrates was around 0.033 after optimizing its chemical production module. The chemical impacts of organic nitrates on ozone production were related to VOC-OH reactivity and aeff. We found that VOC-OH reactivity was positively related to aeff, resulting in the suppression of ozone production caused by organic nitrates, which showed that P（Ox=O3＋NO2） increased initially and subsequently decreased with VOC-OH reactivity. These results highlight the importance of organic nitrate＇s impact on ozone production in strategies to control ozone pollution, specifically regarding the reduction of low-molecular-weight VOCs in the Pearl River Delta.

关键词： Organic nitrates Ozone RACM2 Pearl River Delta

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Numerical study of the separation performance of granular sludge and activated sludge in gravity-driven cyclonic field

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Journal of Water Process Engineering 2025年 74卷

作者： Huang, Fei Zhang, Yuantao Tian, Jinyi State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery East China University of Science and Technology Shanghai 200237 China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and Technology Shanghai 200237 China

The cultivation of aerobic granular sludge (AGS) in a continuous flow process requires an external granular sludge and flocculent activated sludge separator to return the faster settling granular sludge. Experimental studies have confirmed that hydrocyclones are an effective solution for this purpose. This study employed CFD numerical simulations to investigate the operational performance of hydrocyclones at different installation angles. Furthermore, it explored the principles of gravity-driven hydrocyclone-enhanced separation of granular sludge and activated sludge, as well as the hydrocyclone-promoted granulation. The split ratio and separation efficiency are generally proportional to the installation angle, with the optimal angle range identified as −15°~15°. Activated sludge shows a better flow separability with low velocity fluctuations, whereas granular sludge shows more pronounced velocity variations. The results indicate that the inclined gravity-driven hydrocyclone exhibit only a limited difference in separation performance between granular sludge and activated sludge. Therefore, the potential reason for the hydrocyclone-promoted granulation may not be the traditionally considered separative effect, but rather the particle motion induced by the hydraulic shear flow field. © 2025 Elsevier Ltd

关键词： Activated sludge Granular sludge Hydrocyclone Numerical simulation Separation performance

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Peroxyacetyl nitrate observed in Beijing in August from 2005 to 2009

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Journal of environmental Sciences 2014年第10期26卷 2007-2017页

作者： Tianyu Gao Li Han Bin Wang Guang Yang Zhenqiang Xu Limin Zeng Jianbo Zhang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking University

Measurements of peroxyacetyl nitrate（PAN） were made at a Beijing urban site each August from2005 to 2009. Over this 5-year period, the average PAN concentration for August in each year increased from 3（2005） to 11.7 μg/m3（2007）; however, it decreased rapidly in 2008（4.1 μg/m3）.Generally, the variation over the 5 years showed a rise in the first part of the study period,followed by a decline. We considered two categories of local and regional air masses in this study, which revealed that the PAN concentration in Beijing was affected mainly by southeastern air masses. The August PAN variation was influenced predominantly by local air masses in 2005,but by 2009 regional air masses had become more important. This study showed the level and variation of PAN in the month of August in 5 consecutive years for the first time, and proved that control measures are useful in decreasing photochemical pollution; hence, these measures are probably feasible for other megacities too. Furthermore, this method of analyzing regional and local impacts might be useful for other studies as well.

关键词： PAN Beijing Transport Local Regional

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Adsorption of chlorophenols from aqueous solutions by pristine and surface functionalized single-walled carbon nanotubes

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Journal of environmental Sciences 2016年第5期28卷 187-198页

作者： Han Ding Xin Li Jun Wang Xiaojian Zhang Chao Chen State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University

The adsorption of six kinds of chlorophenols on pristine, hydroxylated and carboxylated single-walled carbon nanotubes（SWCNTs） has been investigated. Pseudo-first order and pseudo-second order models were used to describe the kinetic data. All adsorption isotherms were well fitted with Langmuir, Freundlich and Polanyi–Manes models, due to surface adsorption dominating the adsorption process. The close linear relationship between log Kowand log Kdsuggested that hydrophobicity played an important role in the adsorption. The SWCNTs＇ adsorption capacity for chlorophenols was weakened by addition of oxygen-containing functional groups on the surface, due to the loss of specific surface area, the increase of hydrophilicity and the reduction of π–π interaction. The best adsorption capacity of pristine SWCNTs, SWCNT-OH and SWCNT-COOH for six chlorophenols varied from 19 to 84 mg/g, from 19 to 65 mg/g and from 17 to 65 mg/g,respectively. The effect of pH on the adsorption of 2,6-dichlorophenol（2,6-DCP）, was also studied. When p H is over the pK aof 2,6-dichlorophenol（2,6-DCP）, its removal dropped sharply. When ionic strength increased（Na Cl or KCl concentration from 0 to 0.02 mmol/L）,the adsorption capacity of 2,6-DCP on pristine SWCNTs decreased slightly. The comparison of chlorophenols adsorption by SWCNTs, MWCNTs and PAC was made, indicating that the adsorption rate of CNTs was much faster than that of PAC. The results provide useful information about the feasibility of SWCNTs as an adsorbent to remove chlorophenols from aqueous solutions.

关键词： Adsorption Chlorophenols Single-walled carbon nanotubes Isotherms Kinetics Cation–π interaction

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Microbial aerosol chemistry characteristics in highly polluted air

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Science China Chemistry 2019年第8期62卷 1051-1063页

作者： Ting Zhang Xinyue Li Minfei Wang Haoxuan Chen Maosheng Yao State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking University

Aerosol chemistry is often studied without considering microbial involvements. Here, we investigated time-and size-resolved bacterial aerosol dynamics in air. Under high particulate matter(PM) polluted episodes, bacterial aerosols exhibited a viability of up to 50%–70% in the 0.56–1 μm size range, at which elevated levels of SO42-, NO3- and NH4+ were concurrently *** or acclimated for both industrial use, bacteria such as Psychrobacter spp., Massilia spp., Acinetobacter lwoffii,Exiguobacteriumaurantiacum and Bacillusmegaterium were shown to have experienced massive abundance shifts in polluted air on early mornings and late afternoons, on which rapid new particle formation events were widely reported. Here, Psychrobacter spp. were shown to account for >96% abundance at a corresponding PM2.5 level of 208 μg/m3. These observed bacterial aerosol changes corresponded to the PM2.5 mass peak shift from 3.2–5.6 μm to the high viability size range of 0.56–1 μm. Additionally,elevated levels of soluble Na, Ca, Mg, K, Al, Fe and P elements, required for bacterial growth, were observed to co-occur with those significant bacterial aerosol structure shifts in the air. For particular time-resolved PM2.5 pollution episodes, Acinetobacter,Psychrobacter and Massilia were shown to alternate in dominating the time-resolved aerosol community structures. The results from a HYSPLIT trajectory model simulation suggested that air mass transport played a minor role in affecting the observed bacterial aerosol structure dynamics. All the data here suggested that airborne bacteria in the size range of 0.56–1 μm could be extensively involved in aerosol chemistry in highly polluted humid air.

关键词： bacterial aerosol dynamics in air particulate matter size-and time-resolved bacterial aerosol aerosol chemistry

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