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Revisiting the measurements and interpretations of DLVO forces

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arXiv

arXiv 2024年

作者： Feng, Bo Liu, Xiantang Liu, Xinmin Li, Yingli Li, Hang Chongqing Key Laboratory of Soil Multi-Scale Interfacial Processes College of Resources and Environment Southwest University Chongqing400715 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

The DLVO theory and electrical double layer (EDL) theory are the foundation of colloid and interface science. With the invention and development of surface forces apparatus (SFA) and atomic force microscope (AFM), the measurements and interpretations of DLVO forces (i.e., mainly measuring the EDL force (electrostatic force) FEDL and van der Waals force FvdW, and interpreting the potential ψ, charge density σ, and Hamaker constant H) can be greatly facilitated by various surface force measurement techniques, and would have been very promising in advancing the DLVO theory, EDL theory, and colloid and interface science. However, although numerous studies have been conducted, pervasive anomalous results can be identified throughout the literature, main including: (1) the fitted ψ/σ is normally extremely small (ψ can be close to or (much) smaller than ψζ (zeta potential)) and varies greatly;(2) the fitted ψ/σ can exceed the allowable range of calculation;and (3) the measured FvdW and the fitted H vary greatly. Based on rigorous and comprehensive arguments, we have reasonably explained the pervasive anomalous results in the literature and further speculated that, the pervasive anomalous results are existing but not noticed and questioned owing to the two important aspects: (1) the pervasive unreasonable understandings of EDL theory and (2) the commonly neglected systematic errors. Consequently, we believe that the related studies have been seriously hampered. We therefore call for reexamination and re-analysis of related experimental results and theoretical understandings by careful consideration of the EDL theory and systematic errors. On these bases, we can interpret the experimental results properly and promote the development of EDL theory, colloid and interface science, and many related fields. Copyright © 2024, The Authors. All rights reserved.

关键词： Systematic errors

Simultaneous Hydrogen Production from Wastewater Degradation by Protonated Porous G-C3n4/Bivo4 Z-Scheme Composite Photocatalyst

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SSRN 2023年

作者： Yu, Chongfei Yang, Huiying Zhao, Huiyu Huang, Xin Liu, Mengna Du, Cuiwei Chen, Ruyan Feng, Jinglan Dong, Shuying Sun, Jianhui School of Environment Henan Normal University Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control Ministry of Education Henan Key Laboratory for Environmental Pollution Control Henan Xinxiang453007 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China

Inspired by organic contaminants acting as sacrificial agents to accelerate the photocatalytic H2 evolution, protonated porous g-C3N4/BiVO4 Z-scheme photocatalysts was prepared through a simple one-step hydrothermal method for the degradation of ofloxacin (OFL) wastewater and simultaneous hydrogen production. The optimal g-C3N4/BiVO4 (HCN/BV-5) sample degraded the OFL wastewater with a hydrogen yield of 80.7 μmol∙g-1∙h-1, demonstrating the potential in protonated porous g-C3N4/BiVO4 Z-scheme photocatalyst synchronous photocatalytic degradation antibiotic wastewater and hydrogen production. By carrying out the free radical quenching experiments and electron spin resonance experiments, it proves that the ·OH and h+ radicals play the most positive roles in the simultaneous OFL antibiotic wastewater degradation and hydrogen production process. Meanwhile, the HCN/BV-5 also exhibited a significantly H2 evolution performance in different real-world water bodies and universal applicability to the degradation of antibiotics wastewater. This work presents a new idea for alleviating current energy crisis and addressing environmental problems. © 2023, The Authors. All rights reserved.

关键词： Hydrogen production

Synchronous removal of CuO nanoparticles and Cu2+ by polyaluminum chloride-Enteromorpha polysaccharides: Effect of Al species and pH

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Journal of Environmental Sciences 2020年第2期32卷 1-11页

作者： Yuanxia Luo Baoyu Gao Jie Wang Qinyan Yue Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong University266000 QingdaoChina

Copper oxide nanomaterials have been extensively applied and can have serious impacts when discharged into the aquatic environment, especially when complexed with humic acid(HA) to form composite *** an innovative recycled coagulant aid,Enteromorpha polysaccharides(Ep) were associated with polyaluminum chloride(PACl)(denoted as PACl-Ep) to simultaneously remove CuO nanoparticles, Cu2+and HA in this *** influence of different Al species coagulants(AlCl3, PAClb and PAClc) and water pH on coagulation performance, floc properties and reaction mechanisms was investigated in *** showed that in the three PACl-Ep systems, PAClb-Ep gave the highest removal efficiencies for turbidity and Cu2+, and the best UV254 removal effect was reached by using *** contents of Alb and Alc contributed to great coagulation performance because of their stronger bridging and sweeping *** all the Al species coagulants, alkalescent conditions were more conducive to removing Cu and HA compared to acidic ***, smaller and more agminated flocs with great recovery ability were formed by PAClb-Ep and PAClc-Ep systems(bridging and enmeshment effects cooperated with the chelated reticular structure formed by the Ep and Al species).Similarly,due to the increased hydrolysis and hydroxide precipitates, flocs formed under the condition of alkalescence were smaller, denser and stronger compared with weakly acidic conditions.

关键词： Al species Enteromorpha polysaccharides Polyaluminum chloride 27Al nuclear magnetic resonance Simultaneous removal

Typical antibiotic resistance genes and their association with driving factors in the coastal areas of Yangtze River Estuary

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Environmental Science and pollution Research 2024年第21期31卷 30440-30453页

作者： Xu, Qiuhong Liu, Shuguang Lou, Sha Tu, Junbiao Li, Xin Jin, Yuchen Yin, Wenjun Radnaeva, Larisa Dorzhievna Nikitina, Elena Makhinov, Aleksei Nikolavich Araruna, José Tavares Fedorova, Irina Viktorovna Department of Hydraulic Engineering College of Civil Engineering Tongji University Shanghai China Key Laboratory of Yangtze River Water Environment Ministry of Education Tongji University Shanghai China State Key Laboratory of Marine Geology Tongji University Shanghai China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai China Laboratory of Chemistry of Natural Systems Baikal Institute of Nature Management of Siberian Branch of the Russian Academy of Sciences Republic of Buryatia Russia Institute of Water and Ecology Problems Far East Branch Russian Academy of Sciences Khabarovsk Russia Pontifical Catholic University of Rio de Janeiro Rio de Janeiro Brazil Institute of Earth Sciences Saint Petersburg State University St Petersburg Russia

The massive use of antibiotics has led to the escalation of microbial resistance in aquatic environment, resulting in an increasing concern regarding antibiotic resistance genes (ARGs), posing a serious threat to ecological safety and human health. In this study, surface water samples were collected at eight sampling sites along the Yangtze River Estuary. The seasonal and spatial distribution patterns of 10 antibiotics and target genes in two major classes (sulfonamides and tetracyclines) were analyzed. The findings indicated a high prevalence of sulfonamide and tetracycline resistance genes along the Yangtze River Estuary. Kruskal–Wallis analysis revealed significant seasonal variations in the abundance of all target genes. The accumulation of antibiotic resistance genes in the coastal area of the Yangtze River Estuary can be attributed to the influence of urban instream runoff and the discharge of effluents from wastewater treatment plants. ANISOM analysis indicated significant seasonal differences in the microbial community structure. VPA showed that environmental factors contribute the most to ARG variation. PLS-PM demonstrate that environmental factors and microbial communities pose direct effect to ARG variation. Analysis of driving factors influencing ARGs in this study may shed new insights into the mechanism of the maintenance and propagation of ARGs. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Antibiotics

A Review of the Life Cycle Analysis for Plastic Waste Pyrolysis

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Open Journal of Polymer Chemistry 2024年第3期14卷 113-145页

作者： Dounmene Tadida Lhami Arielle Wafula Gerald Nalume Youwene Gilbert College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resources Reuse Tongji University Shanghai China School of Electronics Science Engineering Nanjing Southeast University Nanjing China

Pyrolysis is a rapidly expanding chemical-based recyclable method that complements physical recycling. It avoids improper disposal of post-consumer polymers and mitigates the ecological problems linked to the production of new plastic. Nevertheless, while there is a consensus that pyrolysis might be a crucial technology in the years to come, more discussions are needed to address the challenges related to scaling up, the long-term sustainability of the process, and additional variables essential to the advancement of the green economy. Herein, it emphasizes knowledge gaps and methodological issues in current Life Cycle Assessment (LCA), underlining the need for standardized techniques and updated data to support robust decision-making for adopting pyrolysis technologies in waste management strategies. For this purpose, this study reviews the LCAs of pyrolytic processes, encompassing the complete life cycle, from feedstock collection to end-product distribution, including elements such as energy consumption, greenhouse gas emissions, and waste creation. Hence, we evaluate diverse pyrolysis processes, including slow, rapid, and catalytic pyrolysis, emphasizing their distinct efficiency and environmental footprints. Furthermore, we evaluate the impact of feedstock composition, process parameters, and scale of operation on the overall sustainability of pyrolysis-based plastic waste treatment by integrating results from current literature and identifying essential research needs. Therefore, this paper argues that existing LCA studies need more coherence and accuracy. It follows a thorough evaluation of previous research and suggests new insights into methodologies and restrictions.

关键词： Plastics Thermal Recycling Carbon Dioxide Emissions Life Cycle Evaluation Pyrolysis

A Novel Self-Assembled Zif-67 Hollow Prisms For High-Efficient Simultaneous Removal Of Ciprofloxacin And Lead

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SSRN 2023年

作者： Lin, Mei Wu, Jianwang Chen, Zuliang Fujian Province Key Laboratory of Pollution Control and Resource Reuse School of Environmental and Resource Sciences Fujian Normal University Fujian Province Fuzhou350007 China

Due to the wide variety of pollutants in wastewater, therefore, how to efficiently and effectively remove mixed pollutants is of great importance for environmental remediation. In this study, ZIF-67 hollow prisms self-assembled by nanoparticles were prepared. The nanoparticles possess a regular distributed pore structure, which mixed with the self-assembled hierarchical structure can provide more binding sites. This special self-assembly structure endows ZIF-67 hollow prisms to have a large specific surface area (1221 m2 g−1), and to exhibit excellent efficiency in removing a variety of pharmaceuticals. For simultaneous removal of ciprofloxacin and Pb(II) mixed pollutants, the adsorption process of Pb(II) is ultra-fast ( © 2023, The Authors. All rights reserved.

关键词： Adsorption

Application of Fe(Ⅵ)in abating contaminants in water:state of art and knowledge gaps

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Frontiers of Environmental Science & Engineering 2021年第5期15卷 7-27页

作者： Shuchang Wang Binbin Shao Junlian Qiao Xiaohong Guan State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092China International Joint Research Center for Sustainable Urban Water System Tongji UniversityShanghai200092China

The past two decades have witnessed the rapid development and wide application of Fe(Ⅵ)in the field of water de-contamination because of its environmentally benign ***(Ⅵ)has been mainly applied as a highly efficient oxidant/disinfectant for the selective elimination of *** in situ generated iron(III)(hydr)oxides with the function of adsorption/coagulation can further increase the removal of contaminants by Fe(Ⅵ)in some *** of the limitations of Fe(Ⅵ)per se,various modified methods have been developed to improve the performance of Fe(Ⅵ)oxidation *** on the published literature,this paper summarized the current views on the intrinsic properties of Fe(Ⅵ)with the emphasis on the self-decay mechanism of Fe(Ⅵ).The applications of Fe(Ⅵ)as a sole oxidant for decomposing organic contaminants rich in electron-donating moieties,as a bi-functional reagent(both oxidant and coagulant)for eliminating some special contaminants,and as a disinfectant for inactivating microorganisms were systematically ***,the difficulties in synthesizing and preserving Fe(Ⅵ),which limits the large-scale application of Fe(Ⅵ),and the potential formation of toxic byproducts during Fe(Ⅵ)application were *** paper also systematically reviewed the important nodes in developing methods to improve the performance of Fe(Ⅵ)as oxidant or disinfectant in the past two decades,and proposed the future research needs for the development of Fe(Ⅵ)technologies.

关键词： Ferrate Oxidation Disinfection Coagulation Enhancement

Low-Carbon Pathway in Municipal Life Plastic Waste Disposal Can Bring Net Benefit: A Case Study for Nanjing, China

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SSRN 2024年

作者： Wang, Zi-Yang Liu, Li-Na Jiang, Wei Zhang, Quan-Xing Sun, Ping State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China JSTI Energy Technology Development Co. Ltd. Nanjing210017 China

The disposal of Municipal Life Plastic Waste (MLPW) in Nanjing not only contributes to greenhouse gas (GHG) emissions but also fails to fully exploit its economic benefits. This study investigates the long-term potential for emission reduction associated with MLPW disposal, in line with China's "14th Five-Year Plan for Plastic pollution". Employing an integrated bottom-up model, we assessed the lifecycle material flow of Nanjing's MLPW in 2020 and predicted its environmental impact and benefits to 2060 under multi-objective low-carbon scenarios. Results suggest measures combing source reduction, biomaterial replacement, recycling and utilization can yield significant environmental and economic benefits. The strategy proposed in this study is expected to achieve 96.3% reduction in greenhouse gas emissions, while also obtaining significant economic benefits up to 2060. We advocate that prioritizing mechanical recycling is the optimal path to mitigate emissions and enhance economic benefits. The study provides data support and path recommendation for the management of municipal life plastic waste. © 2024, The Authors. All rights reserved.

关键词： Waste disposal

Mxene-Supported Mil-88a(Fe) as Persulfate Activator for Removal of Tetracycline

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SSRN 2023年

作者： Chen, Junxia Yang, Zhenzhen Li, Weigang Yang, Yuying Zhu, Feng Huo, Zongli Zhou, Qing State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China Jiangsu Provincial Center for Disease Control and Prevention Nanjing210009 China

The poor conductivity，poor stability and agglomeration of MIL-88A(Fe) limit its application as persulfate (PS) activator in water purification. Herein, MXene-supported MIL-88A (Fe) composites (M88A/MX) were synthesized to enhance its adsorption and catalytic capability for tetracycline (TC) removal. M88A/MX-0.2 composites exhibits optimal degradation efficiency，reaching 98% under conditions of 0.2 g/L M88A/MX-0.2, 1.0 mM PS, 20 ppm TC, and pH 5. The degradation rate constants of M88A/MX-0.2 was 0.03217 min-1, which was much higher than that of MIL-88A(Fe) (0.00159 min-1) and MXene (0.00626 min-1). The removal effects of reaction parameters, such as dosage of M88A/MX-0.2 and PS, initial solution pH and the presence of the common co-existing constituents (humic acid and the inorganic anions) were investigated in detail. Additionally, the reuse of M88A/MX-0.2 showed that the composites had good cycling stability. The results of electron paramagnetic resonance (EPR) and quenching experiments indicated that ·OH, ·SO4- and ·O2- were involved in the M88A/MX-0.2/PS system. This study offered a new avenue for sul-fate-based degradation of Fe-based metal organic framework. © 2023, The Authors. All rights reserved.

关键词： Degradation