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Fabrication of straw-based graphene aerogels for oil/water separation: the effects of crude fiber fractions in straw

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environmental Science and pollution Research 2025年第1期32卷 43-55页

作者： Dan, Hongbing Gao, Yue Wei, Xianxiao Yue, Qinyan Gao, Baoyu Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Jinan250100 China

Benefiting from its abundance, eco-friendliness, and sustainability, crop straw is considered a promising candidate combined with graphene oxide (GO) to fabricate straw-based graphene aerogels (SGAs) for oil/water separation. However, considering the complex composition of straw, the roles played by different crude fibers in straw in the formation of SGAs are still unclear. Herein, wheat straw (WS) was used in this work and pretreated with acid and alkali to regulate its crude fiber fractions. Then, it was crosslinked with GO to fabricate various SGAs for comparing their differences in the formation, structure, and oil/water separation performance. Results indicated that acid can remove plentiful hemicellulose from the WS (from 29.9 ± 2.1 to 7.0 ± 0.8 wt%) while retaining most lignin and cellulose;alkali can retain cellulose (from 32.4 ± 3.6 to 70.6 ± 1.3 wt%) while greatly removing lignin and hemicellulose. Ascribed to high BET surface area and porous structure, the graphene aerogels formed by acid-/alkali-treated WS demonstrated superior oil absorption capacity (AC-WSGA: 62.3–126.0 g/g and AL-WSGA: 66.3–125.2 g/g). The poor mechanical compressibility of AC-WSGA was caused by the high lignin residue (16.2 ± 0.7 wt%) in AC-WS. The maximum compressive stress for AL-WSGA under 60% strain was 1.6 kPa, ensuring it achieved recoverable oil-absorbing properties by extrusion. The above findings suggested that cellulose and hemicellulose in straw contributed to the formation of SGAs with abundant porous and compressible architecture, whereas the presence of lignin greatly increased the brittleness of SGAs and decreased their oil removal and recycling performances. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Aerogels

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Win-Win:Anthropogenic circularity for metal criticality and carbon neutrality

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Frontiers of environmental Science & Engineering 2023年第2期17卷 111-122页

作者： Xianlai Zeng State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

resource depletion and environmental degradation have fueled a burgeoning discipline of anthropogenic circularity since the *** generally consists of waste reuse,remanufacturing,recycling,and *** economy and“zero-waste”cities are sweeping the globe in their current practices to address the world’s grand concerns linked to resources,the environment,and ***,metal criticality and carbon neutrality,which have become increasingly popular in recent years,denote the material's feature and state,*** goal of this article is to determine how circularity,criticality,and neutrality are *** anthropogenic circularity has the potential to expand the metal supply and,as a result,reduce metal *** barely accomplished 15%of its potential emission reduction by recycling iron,copper,and *** circularity has a lot of room to achieve a win-win objective,which is to reduce metal criticality while also achieving carbon neutrality in a near closed-loop *** barriers or challenges for conducting anthropogenic circularity are deriving from the inadequacy of life-cycle insight governance and the emergence of anthropogenic circularity *** flow analysis and life cycle assessment are the central methodologies to identify the hidden *** processing and smelting,as well as end-of-life management,are indicated as critical priority areas for enhancing anthropogenic circularity.

关键词： Anthropogenic circularity Material flow analysis Criticality Carbon neutrality Solid waste Circular economy

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Antibiotics-heavy metals combined pollution in agricultural soils:Sources,fate,risks,and countermeasures

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Green Energy & environment 2025年第5期10卷 869-897页

作者： Yuanxiang Shu Donghao Li Tong Xie Ke Zhao Lu Zhou Fengxiang Li College of Environmental Science and Engineering Ministry of Education Key Laboratory of Pollution Processes and Environmental CriteriaRemediation and Pollution Control for Urban Ecological EnvironmentalNankai UniversityTianjin300350China College of Municipal and Environmental Engineering Ministry of Education Key Laboratory of Songliao Aquatic EnvironmentJilin Jianzhu UniversityChangchun130118China College of the Environment State Key Laboratory of Pollution Control and Resource ReuseJiangsu Key Laboratory of Vehicle Emissions ControlNanjing UniversityNanjing210023China

Agricultural soil is related to food security and human health,antibiotics and heavy metals(HMs),as two typical pollutants,possess a high coexistence rate in the environmental medium,which is extremely prone to inducing antibiotic-HMs combined ***,frequent human activities have led to more prominent antibiotics-HMs combined contamination in agricultural soils,especially the production and spread of antibiotic resistance genes(ARGs),heavy metal resistance genes(MRGs),antibiotic resistant bacteria(ARB),and antibiotics-HMs complexes(AMCs),which seriously threaten soil ecology and human *** review describes the main sources(Intrinsic and manmade sources),composite mechanisms(co-selective resistance,oxidative stress,and Joint toxicity mechanism),environmental fate and the potential risks(soil ecological and human health risks)of antibiotics and HMs in agricultural ***,the current effective source blocking,transmission control,and attenuation strategies are classified for discussion,such as the application of additives and barrier materials,as well as plant and animal remediation and bioremediation,etc.,pointing out that future research should focus on the whole chain process of“source-processterminal”,intending to provide a theoretical basis and decision-making reference for future research.

关键词： Antibiotics Heavy metals Agricultural soils Composite mechanisms Potential risks Soil remediation

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Feasibility study of a process for the reduction of sulfur oxides in flue gas of fluid catalytic cracking unit using the riser reactor

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Petroleum Science 2025年第2期22卷 909-924页

作者： Fa-Lu Dang Gang Wang Jing-Cun Lian Yu Yang Mei-Jia Liu State Key Laboratory of Heavy Oil Processing College of Chemical Engineering and EnvironmentChina University of PetroleumBeijing102249China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China

In this work,a new process for achieving the recovery of elemental sulfur by utilizing a fluidized catalytic cracking(FCC) riser reactor for SOxtreatment(FCC-DeSOx) is *** process leverages the high temperatures and hydrocarbon concentrations in the FCC riser reactor to convert SOxinto H_(2)***,H_(2)S,along with the cracked gas,is processed downstream to produce *** analysis of the key reduction reactions in the FCC-DeSOxprocess revealed that complete conversion of SOxto H_(2)S is feasible in the dry gas(hydrogen-rich) prelift zone,as well as the upper and lower zones of the riser,upon achieving thermodynamic *** studies were conducted to replicate the conditions of these reaction zones using a low concentration of hydrogen gas as the reducing *** process optimization,investigation of the minimum reaction time,and kinetic studies,the potential of this method for the complete reduction of SOxwas further confirmed.

关键词： Sulfur oxides New catalytic cracking process Thermodynamic analysis Kinetic analysis Sulfur recovery

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Enhancing corn stalk-based anaerobic digestion with different types of zero-valent iron added during the acidification stage:Performance and mechanism

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Journal of environmental Sciences 2024年第11期145卷 64-74页

作者： Xiang Liu Yue Liu Min Wang Qianzhen Deng Hao Yang College of Agricultural Science and Engineering Hohai UniversityNanjing 210098China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution Wenzhou UniversityWenzhou 325035China Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse Anhui Jianzhu UniversityHefei 230009China

Anaerobic digestion has been defined as a competitive approach to facilitate the recycling of corn ***,few studies have focused on the role of direct interspecies electron transfer(DIET)pathway in the acidification stage under the addition of different particle sizes of zero-valent iron(ZVI).In this study,three types of ZVI,namely iron filings,iron powder and nanoscale iron,were investigated,respectively,to enhance its high-value *** in volatile fatty acids(VFAs)and methane(CH4)production associated with the underlyingmechanisms were emphatically *** indicated that the addition of ZVI could increase the concentration of VFAs,with the most outstanding performance observed with the use of nanoscale ***,the conversion of propionic acid to acetic acid was driven by adding ZVI with no between-group differences in acidizing ***,the substrate was more fully utilized when supplied with iron powder compared with other groups in methanogenic phase,thereby displaying the maximumCH4 yield with a value of 263.1 mL/(g total solids(TS)).However,adding nanoscale iron could signally shorten the digestion time(T80),saving 7 days in comparison to the group of iron powder.

关键词： Zero-valent iron Corn stalk Anaerobic digestion Volatile fatty acids Methane

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Solid Bronsted acidity boosts adsorption reactivity of nano-adsorbent for water decontamination

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Frontiers of environmental Science & Engineering 2024年第7期18卷 23-34页

作者： Sikai Cheng Zhixian Li Kaisheng Zhang Qingrui Zhang Xiaolin Zhang Bingcai Pan State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Environmental Materials and Pollution Control Laboratory Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Hebei Key Laboratory of Heavy Metal Deep-remediation in Water and Resource Reused Qinhuangdao 066004China Research Center for Environmental Nanotechnology(ReCENT) Nanjing UniversityNanjing 210023China

Despite the development of various Lewis acidic nano-adsorbents for fluoride removal through innersphere coordination,strong competition for hydroxyl ions still hinders efficient water *** addition,the critical issue of polysilicate scaling that results from the ubiquitous silicates must be *** tackle these issues,an alternative approach to enhancing adsorption reactivity by modifying nano-adsorbents with dual Lewis and Bronsted acidity is *** feasibility of this approach is demonstrated by growing zirconium phosphate(ZrP)inside a gel-type anion exchanger,N201,to produce nanocomposite ZrP@N201,in which the confined ZrP contained an otherwise metastable amorphous phase with Lewis acidic Zr^(4+) sites and Bronsted acidic monohydrogen phosphate groups(-O_(3)POH).Compared with the Lewis acidic nano-zirconium oxide analog(HZ0@N201),ZrP@N201 exhibited a greatly improved adsorption capacity(117.9 vs.52.3 mg/g-Zr)and mass transfer rate(3.56×10^(-6) vs.4.55×10^(-7) cm/s),while bulk ZrP produced a thermodynamically stableα-phase with Bronsted acidity that exhibited negligible adsorption capability toward *** enhanced defluoridation activity of ZrP@N201 is attributed to Bronsted acidity and the increased outer electron density of ZA+sites,as corroborated using XPS and solid-state NMR ***,Bronsted acidity strengthens the resistance of ZrP@N201 to silicate,allowing its full regeneration during cyclic *** tests demonstrated 3-10 times the amount of clean water from(waste)for ZrP@N201 as compared to both HZO@N201 and the widely used activated aluminum *** study highlights the potential of developing nano-adsorbents with dual acidities for various environmental remediation applications.

关键词： Nanocomposite Selective adsorption Fluoride removal Dual Lewis and Bronsted acidity Regeneration

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Particle number size distributions and formation and growth rates of different new particle formation types of a megacity in China

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Journal of environmental Sciences 2023年第9期131卷 11-25页

作者： Liang Dai Yu Zhao Lei Zhang Dong Chen Rongrong Wu State Key Laboratory of Pollution Control and Resource Reuse and School of the Environment Nanjing UniversityJiangsu 210023China Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) Nanjing University of Information Science and TechnologyJiangsu 210044China

To understand the contribution of new particle formation(NPF)events to ambient fine particle pollution,measurements of particle size distributions,trace gases and meteorological conditions,were conducted at a suburban site(NJU)from October to December 2016 and at an industrial site(NUIST)from September to November 2015 in *** to the temporal evolution of the particle size distributions,three types NPF events were observed:typical NPF(Type A),moderate NPF events(Type B)and strong NPF(Type C)*** favorable conditions for Type A events included low relative humidity,low concentration of pre-existing particles,and high solar *** favorable conditions of Type B events were similar to Type A,except for a higher concentration of pre-existing *** C events were more likely to happen with the higher relative humidity,lower solar radiation and continuous growth of pre-existing particle *** formation rate of 3 nm(J3)was the lowest for Type A events and highest for Type C *** contrast,the growth rates of 10 nm and 40 nm particles were the highest for Type A,and lowest for Type *** show that NPF events with only higher J3 would lead to the accumulation of nucleation mode *** acid was important for the formation of particles but had little effect on the growth of particle size.

关键词： New particle formation Size distribution Formation and growth rate Aerosol pollution

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Sex-dependent obesogenic effect of tetracycline on Drosophila melanogaster deteriorated by dysrhythmia

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Journal of environmental Sciences 2023年第2期124卷 472-480页

作者： Xueping Guo Zhenyang Yu Daqiang Yin State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze River Water EnvironmentMinistry of EducationCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China Jiaxing Tongji Institute for Environment Jiaxing 3014051China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Antibiotics have been identified as obesogens contributing to the prevalence of ***,their environmental toxicity shows sex dependence,which might also explain the sex-dependent obesity ***,the direct evidence for such a connection and the underlying mechanisms remain to be *** this study,the effects of tetracycline,which is a representative antibiotic found in both environmental and food samples,on Drosophila melanogaster were studied with consideration of both sex and circadian rhythms(represented by the eclosion rhythm).Results showed that in morning-eclosed adults,tetracycline significantly stimulated the body weight of females(AM females)at 0.1,1.0,10.0 and 100.0μg/L,while tetracycline only stimulated the body weight of males(AM males)at 1.0μg/*** the afternoon-eclosed adults,tetracycline significantly stimulated the body weight of females(PM females)at 0.1,1.0 and 100.0μg/L,while it showed more significant stimulation in males(PM males)at all ***,the stimulation levels were the greatest in PMmales among all the *** results showed the clear sex dependence of the obesogenic effects,which was diminished by *** biochemical assays and clustering analysis suggested that the sex-and rhythm-dependent obesogenic effects resulted from the bias toward lipogenesis against ***,theywere closely related to the preference for the energy storage forms of lactate and glucose and also to the presence of excessive insulin,with the involvement of glucolipid *** relationships indicated potential bridges between the obesogenic effects of pollutants and other diseases,e.g.,cancer and diabetes.

关键词： Obesogenic effect Tetracycline Sex Circadian rhythm Glucolipid metabolism

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Identification of key precursors contributing to the formation of CX_(3)R-type disinfection by-products along the typical full-scale drinking water treatment processes

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Journal of environmental Sciences 2023年第6期128卷 81-92页

作者： Xu Yang Shunke Ding Rong Xiao PinWang Zhenqi Du Ruihua Zhang Wenhai Chu State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Ministry of Education Key Laboratory of Yangtze River Water Environment Tongji UniversityShanghai 200092China

Identification and characterization of disinfection by-product(DBP)precursors could help optimize drinkingwater treatment processes and improve the quality of *** study comprehensively investigated the characteristics of dissolved organic matter(DOM),the hydrophilicity and molecule weight(MW)of DBP precursor and DBP-associated toxicity along the typical full-scale treatment *** results showed that dissolved organic carbon and dissolved organic nitrogen content,the fluorescence intensity and the SUVA254 value in raw water significantly decreased after the whole treatment *** treatment processes were in favor of the removal of high-MW and hydrophobic DOM,which are important precursors of trihalomethane and haloacetic *** with conventional treatment processes,Ozone integrated with biological activated carbon(O3-BAC)processes enhanced the removal efficiencies of DOM with different MW and hydrophobic fractions,leading to a further decrease in almost all DBP formation potential and DBP-associated ***,almost 50%of the detected DBP precursors in raw water has not been removed after the coagulation-sedimentation-filtration integrated with O3-BAC advanced treatment *** remaining precursors were found to be mainly hydrophilic and low-MW(<1.0 kDa)***,they would largely contribute to the formation of haloacetaldehydes and haloacetonitriles,which dominated the calculated *** current drinking water treatment process could not effectively control the highly toxic DBPs,the removal of hydrophilic and low-MW organics in drinking water treatment plants should be focused on in the future.

关键词： Disinfection by-products Drinking water Characterization key precursor Hydrophilicity MW distribution

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Synergistic promotion of particulate matter reduction and production performance via adjusting electrochemical reactions in the zinc electrolysis industry

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Frontiers of environmental Science & Engineering 2024年第1期18卷 23-33页

作者： Zizhen Ma Jingkun Jiang Lei Duan Jianguo Deng Fuyuan Xu Zehui Li Linhua Jiang Ning Duan School of Environmental and Municipal Engineering Qingdao University of TechnologyQingdao 266520China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of the EnvironmentTsinghua UniversityBeijing 100084China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China School of Physics Peking UniversityBeijing 100871China

Heavy particulate matter (PM) pollution and high energy consumption are the bottlenecks of hydrometallurgy, especially in the electrolysis process. Therefore, an urgent need is to explore PM reduction methods with production performance co-benefits. This study presents three PM reduction methods based on controlling operating parameters, i.e., lowering electrolyte temperature, H2SO4 concentration, and current density of the cathode. The optimized conditions were also investigated using the response surface methodology to balance the PM reduction effect and Zn production. The results showed that lowering electrolyte temperature is the most efficient, with an 89.0% reduction in the PM generation flux (GFPM). Reducing H2SO4 concentration led to the minimum side effects on the current efficiency of Zn deposition (CEZn) or power consumption (PC). With the premise of non-deteriorating CEZn and PC, GFPM can be reduced by 86.3% at the optimal condition (electrolyte temperature = 295 K, H2SO4 = 110 g/L, current density = 373 A/m^(2)). In addition, the reduction mechanism was elucidated by comprehensively analyzing bubble characteristics, electrochemical reactions, and surface tension. Results showed that lower electrolyte temperature inhibited the oxygen evolution reaction (OER) and compressed gas volume. Lower H2SO4 concentration inhibited the hydrogen evolution reaction (HER) and reduced electrolyte surface tension. Lower current density inhibited both OER and HER by decreasing the reaction current. The inhibited gas evolutions reduced the microbubbles’ number and size, thereby reducing GFPM. These results may provide energy-efficient PM reduction methods and theoretical hints of exploring cleaner PM reduction approaches for industrial electrolysis.

关键词： Zinc electrolysis Particulate matter Energy consumption Operating parameters Bubble characteristic Electrochemical reaction

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