Colloids and Surfaces C: Environmental Aspects最新文献

{"title":"Geochemical dynamics of Cu(II) in contrasting cocoa soils: Kinetics and isotherm modeling","authors":"Joseph Osafo Eduah ,&nbsp;Alfred Arthur ,&nbsp;Samuel Bortei","doi":"10.1016/j.colsuc.2023.100020","DOIUrl":"https://doi.org/10.1016/j.colsuc.2023.100020","url":null,"abstract":"<div><p>Understanding copper (Cu) dynamics in cocoa soils can help predict the fate, mobility, and toxicity, which is crucial for sustaining soil functionality, as well as the quality and health safety of cocoa products. Herein, the study investigated sorption-desorption characteristics of Cu(II) in six cocoa soils of varying weathering by kinetics, isothermal, and pH effect experiments in a batch system. Equilibrium sorption increased in the order of Fluvisol &lt; Lixisol &lt; Luvisol &lt; Acrisol = Ferralsol = Nitisol. Kinetics data fitted well to pseudo-second-order and Elovich models. Cu(II) sorption was dominated by outer-sphere and inner-sphere complexations at low and high pH, respectively. The sorption data fitted well with Freundlich and Langmuir's models. Sorption maximum increased in the order of Nitisol (0.91 mg g⁻¹) &lt; Ferralsol (1.21 mg g⁻¹) &lt; Acrisol (1.29 mg g⁻¹) &lt; Lixisol (1.61 mg g⁻¹) &lt; Luvisol (1.68 mg g⁻¹) &lt; Fluvisol (2.01 mg g⁻¹). The binding energy values obtained showed the highest interaction between Cu(II) and soil matrix in Fluvisol and the least in Ferralsol and Nitisol. The desorption studies consistent with the hysteresis index indicated high sorption irreversibility and less Cu(II) mobilization in Fluvisol, Lixisol, Luvisol, and Acrisol vis-à-vis Nitisol and Ferralsol. Nitisol and Ferralsol may promote the possible toxicity of Cu(II) to the soil ecosystem. The study contributes to the sensitivity of Cu(II) mobility and toxicity to the degree of soil weathering; thus, management of heavy metals in cocoa soils should be dependent on soil type.</p></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"1 ","pages":"Article 100020"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49709184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation, nano-mechanics and particle deposition behavior of thin, antifouling hydrogel coatings","authors":"Lina Rozental ,&nbsp;Aleksandr Leontev ,&nbsp;Charles Diesendruck ,&nbsp;Viatcheslav Freger","doi":"10.1016/j.colsuc.2023.100018","DOIUrl":"https://doi.org/10.1016/j.colsuc.2023.100018","url":null,"abstract":"<div><p>Hydrogels based on hydrophilic, crosslinked polymer networks can reduce surface contamination in aqueous environments and continue attracting research interest due to their low adhesion, biocompatibility and tunable properties. In particular, sub-micron hydrogel films can potentially screen a surface from interaction with foulant colloids and microorganisms without compromising original functions, such as water permeation in membranes. This study focuses on the preparation of thin hydrogel films with the goal of understanding their adhesive and micromechanical properties, as well as factors affecting the dynamics of microparticle deposition on such films, mimicking the initial stages of surface fouling with colloids, microparticles and microorganisms. For this purpose, a simple procedure was developed to simultaneously crosslink and covalently anchor multi-arm-PEG precursors to a surface to form a submicron coating as a representative model. The effects of synthetic parameters and external conditions on adhesion and viscoelasticity were studied by force spectroscopy using polystyrene colloidal probes. The same particles were also employed in macroscopic deposition experiments in a parallel plate flow cell under identical solution conditions. Microscopic adhesion and elasticity were unaffected by the hydrogel crosslinking density and by salinity, but strongly affected by solution pH and dwell time, whereas macroscopic deposition was strongly affected both by salinity and by pH. These differences were ascribed to the effect of long-range double-layer forces, involved in deposition but absent in measurements of adhesion and elasticity. The results highlight the differences and similarities between the two types of measurements and underlying phenomena, as a step towards the understanding and rational design of soft antifouling coatings.</p></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"1 ","pages":"Article 100018"},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49709429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cathodic microenvironment reconstruction boost electrocoagulation treatment of photovoltaic wastewater","authors":"Ziqing Qin ,&nbsp;Han Shi ,&nbsp;Hua Zou ,&nbsp;Guoshuai Liu","doi":"10.1016/j.colsuc.2023.100015","DOIUrl":"https://doi.org/10.1016/j.colsuc.2023.100015","url":null,"abstract":"<div><p>Electrocoagulation has emerged as a rapidly advancing area in the field of wastewater treatment due to its capability to eliminate pollutants that are typically resistant to filtration or chemical treatment methods, as well as its overall effectiveness, which is often impeded by the formation and growth of flocs. In this study, simulated photovoltaic wastewater was treated using the electrocoagulation method, with cathodic water reduction employed to induce a highly efficient electrocoagulation rate towards the removal of SiO₂ and F⁻. Our results demonstrate that the optimal conditions for this process involved the use of an Al anode, Nickel foam as cathode, an inter-electrode distance of 1.0 cm, a current density of 30 mA cm⁻², a stirring speed of 300 rpm, sodium chloride as supporting electrolyte, and an initial pH of 7. Our experimental findings indicated satisfactory performance with respect to EC, as evidenced by the reduction of F⁻ content from 25 mg L⁻¹ to 3.68 mg L⁻¹, and the complete removal of SiO₂ from 16 mg L⁻¹. Furthermore, electrochemical analysis and texture characterization revealed that the overall rate of flocculation was dependent on the cathodic material, with in-situ generated OH⁻ in the electrolysis cell influencing the microenvironment of iron hydroxide floc formation and sedimentation. Our study offers conclusive evidence that the optimal cathodic material capable of intensifying OH⁻ concentration from water dissociation is key to achieving superior electrocoagulation performance.</p></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"1 ","pages":"Article 100015"},"PeriodicalIF":0.0,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49719781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential use of coconut husk-based magnetic sorbent for defoaming application","authors":"Felicia Terry Lo ,&nbsp;Soh Fong Lim ,&nbsp;Sing Ngie David Chua ,&nbsp;Kok Keong Lau ,&nbsp;Sim Yee Chin","doi":"10.1016/j.colsuc.2023.100014","DOIUrl":"https://doi.org/10.1016/j.colsuc.2023.100014","url":null,"abstract":"<div><p>Absorption process is the most common method that is being applied to sweeten sour gas in the oil and gas industry. However, this process does have several consequences which will trigger the foam formation of foam that will reduce the mass transfer efficiency and absorption capacity as well as amine solutions carryover to the downstream processes. The removal of undesired contaminants in activated methyldiethanolamine (MDEA) was conducted by utilizing magnetic activated carbon (MAC). In this work, MAC was synthesized from coconut husk through chemical activation and co-precipitation methods. The performance of this material as an adsorbent was evaluated based on the foaming behaviour of activated MDEA solvent after being contacted with MAC at different duration and varying amounts. Nitrogen gas was introduced into the solvent through a gas diffuser to create foam. Based on the results, the foam volume generated by activated MDEA solvent was identified to decrease with the increase in both MAC contact time and amount. The highest removal efficiency by MAC was identified to be at 1 h contact time between MAC and activated MDEA solvent where the foam breaking time was reduced to 10–30 min. Meanwhile, the addition of 50 % MAC into the solvent was able to further decrease the foam breaking time to 5–10 min. The characteristics of the prepared MAC were evaluated through various instrumental analyses. This study shows that the MAC synthesized from coconut husk has a good potential as an adsorbent in removing the contaminants in activated MDEA solvent to reduce foam formation.</p></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"1 ","pages":"Article 100014"},"PeriodicalIF":0.0,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49719777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Superhydrophobic sponge with nanoneedle-like surface for efficiently separating immiscible and emulsified oil-water mixtures","authors":"Yongfei Zhu ,&nbsp;Yonggang Du ,&nbsp;Yuxuan Li ,&nbsp;Zhi Wang ,&nbsp;Junming Su","doi":"10.1016/j.colsuc.2023.100008","DOIUrl":"https://doi.org/10.1016/j.colsuc.2023.100008","url":null,"abstract":"<div><p>To increase the collision probability between emulsified droplets and sponge surface for more efficient separation of emulsions, a durable superhydrophobic melamine sponge (MS) with nanoneedle-like surface was prepared through a simple and inexpensive route in this work. The fabrication processes included the formation of ZnO nanoneedles on MS surface via a hydrothermal method, followed by coating with polybenzoxazine based bisphenol A and dodecylamine (PB-D). As excepted, the resulting superhydrophobic sponge (PB-D/ZnO/MS) could effectively separate various surfactant-stabilized water-in-oil and oil-in-water emulsions, with a high permeation flux of up to 14,050 L m⁻² h⁻¹ and separation efficiency above 98.5 %, driven solely by gravity due to its nanoneedle-like surface. Moreover, PB-D/ZnO/MS also displayed outstanding absorption capacities for various oils and organic solvents (57.4–123.0 g/g) as well as prominent reusability, enduring 30 cycles of repeated absorption-squeezing without any evident decrease in water contact angle and absorption capacity (maintaining 90.9–96.6 % of initial value). In addition, the superhydrophobicity of PB-D/ZnO/MS remained almost unchanged after being immersed in strong acidic, alkaline and salty solutions for 48 h. Furthermore, PB-D/ZnO/MS not only showed outstanding flame retardancy but also remained rapid oil absorption rate under combustion conditions. Thus, the obtained superhydrophobic MS is a promising candidate for practical oil/water separation.</p></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"1 ","pages":"Article 100008"},"PeriodicalIF":0.0,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49709307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of particle size on the capture of uranium oxide colloidal particles from aqueous suspensions via high-gradient magnetic filtration","authors":"Alexander I. Wiechert ,&nbsp;Sotira Yiacoumi ,&nbsp;Joanna McFarlane ,&nbsp;Charles F. Weber ,&nbsp;Costas Tsouris","doi":"10.1016/j.colsuc.2023.100005","DOIUrl":"https://doi.org/10.1016/j.colsuc.2023.100005","url":null,"abstract":"<div><p>The effectiveness of High Gradient Magnetic Filtration (HGMF) in capturing uranium oxide particles from suspensions was investigated in this study. Two sets of experiments were performed to evaluate the importance of size on the capture of uranium oxide particles. The first considered two batches sieved into size bins of&lt; 5, 5–10, 10–15, and 15–20 µm, while the second was performed using two suspensions with diameters smaller than 1.0 µm and between 1.0 and 1.5 µm. Iron oxide experiments, with particles between 0.3 and 0.8 µm, were performed for calibration purposes. In all experiments, a surfactant (Triton-X100 or sodium dodecyl sulfate) was used to prevent particle aggregation and limit the influence of non-magnetic capture mechanisms. A magnetic field of approximately 1.1 Tesla was generated using a water cooled electromagnet. HGMF was performed using tubular filters packed with ferromagnetic stainless-steel wool. Of the initial four uranium oxide particle sizes, magnetic capture was only observed for particles with a diameter of less than 5 µm, while larger particles experienced no magnetic and minimal total capture. For particles with diameters smaller than 1.0 µm and between 1.0 and 1.5 µm, capture efficiencies increased by 39 ± 9% and 34 ± 6% respectively, solely due to the magnetic field. Although the magnetic force is proportional to particle diameter, the capture efficiency decreased as diameter increased. These results suggest that Brownian diffusion, which is influential for micron sized particles and increases with decreasing particle size, is acting in conjunction with the magnetic force to influence the efficacy of HGMF for uranium oxide. This important finding underscores the effectiveness of Brownian diffusion in increasing the rate of collision between particles and collector fibers. A stochastic trajectory model was developed to incorporate the influence of Brownian motion on particle behavior and filter removal efficiency. Modeling results are discussed and compared for uranium and iron oxide particles.</p></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"1 ","pages":"Article 100005"},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49709346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication of superhydrophilic mask non-woven fabric with cellulose/GO composite coating for oil/water separation","authors":"Jinlong Wu ,&nbsp;Yukun Fu ,&nbsp;Haoqi Li ,&nbsp;Mengyan Tan ,&nbsp;Yonglan Zhang","doi":"10.1016/j.colsuc.2023.100003","DOIUrl":"https://doi.org/10.1016/j.colsuc.2023.100003","url":null,"abstract":"<div><p>Superwettable coatings have aroused considerable attention in oil/water separation materials research benefit from their many advantages, such as various preparation methods, high separation efficiency, and low cost. However, many of these coatings are not suitable for practical separation due to the complex composite methods and poor biodegradability. The development of novel superwettable oil/water separation materials with simple fabrication and eco-friendly coating has become a noteworthy target in oil/water separation fields. Since the outbreak of COVID-19, a large number of waste masks abandoned in the natural environments have caused serious environmental hazards. The mask non-woven fabric (MNF) from waste disposable medical masks is a good separation material for its rich microporous. Herein, regenerated degreasing cotton cellulose and graphene oxide (GO) were used to successfully construct an environmentally friendly composite coating on the MNF through a simple dip coating method, and the obtained Cellulose/GO@MNF has excellent superhydrophilicity and underwater superoleophobicity. The fabricated coating possesses favorable chemical stability and nice mechanical strength after being destroyed by corrosive solutions (acid, alkali, salt solution) and physical processing (scratches). Various oil/water mixtures can be separated with high separation efficiency (&gt;98%), and the separation efficiency is absent a substantive drop even after 10 separate cycles. Water can be removed quickly and continuously from the oil/water mixture by the as-fabricated MNF linking with a peristaltic pump. Besides, toluene oil-in-water emulsion can also be separated effectively. What is more significant is that, the Cellulose/GO@MNF fabric fabricated via a simple method and using biodegradable coating materials has potential application prospects in solving both recycling problems of waste masks and oil/water pollution.</p></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"1 ","pages":"Article 100003"},"PeriodicalIF":0.0,"publicationDate":"2023-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49709365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modelling the reaction of uranium with carboxylic groups on surfaces through mono- and multi- dentate surface complexes on the basis of pH and redox potential","authors":"Steven McGowan,&nbsp;Claude Degueldre,&nbsp;Farid Aiouache","doi":"10.1016/j.colsuc.2023.100002","DOIUrl":"https://doi.org/10.1016/j.colsuc.2023.100002","url":null,"abstract":"<div><p>An analytical expression is proposed to simulate effects of pH and redox potential (<em>E</em>) on the sorption of uranium onto bioorganic model particles in saline or other aquatic environments. The elaborated expression is intended to avoid use of the classical approach of sorption which relies on experimental data and empirical models. The goal is to produce an expression that provides a distribution coefficient (<em>Kd</em> e.g. mL g⁻¹) as function of pH, <em>E</em> and ligand concentration (through complex formation in solution) by applying a surface complexation model on one type of mono-dentate surface sites&gt; (SuOH) as well as utilizing multi-dentate surface sites&gt; (SuOH)_c. The formulation of the worked out expression makes use of correlations between the surface complexation and hydrolysis constants for all species and sorption sites. The model was applied to the sorption of uranium onto bioorganic sites with and without carbonates in solution e.g. Log Kd: + 2.75 at pH 8 for 2 sites per nm². The calculated distribution coefficients were found very sensitive to the presence of carbonates, e.g. Log Kd: − 7.0 at pH 8 for 2 × 10⁻³ M total carbonate. The potential reduction of uranium U(VI) and its complexes (carbonates) which are the primary stable species in surface waters, to U(IV) during sorption was simulated in association with a decrease in the redox potential and was found generally below the redox stability limits of water. The calculated distribution coefficient values were validated by the values reported in literature for the sorption of uranium onto specific adsorbents. The investigated simulations are also applicable to the sorption of other redox sensitive elements.</p></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"1 ","pages":"Article 100002"},"PeriodicalIF":0.0,"publicationDate":"2023-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49709363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on droplet wettability of low surface tension working medium based on special-shaped microstructure surface","authors":"Chao Dang ,&nbsp;Xiaowei Wang ,&nbsp;Hao Li ,&nbsp;Liaofei Yin ,&nbsp;Mengjie Song","doi":"10.1016/j.colsuc.2023.100001","DOIUrl":"https://doi.org/10.1016/j.colsuc.2023.100001","url":null,"abstract":"<div><p>The wetting properties of droplets on microstructure surfaces directly determine the hydrophobic properties of the surface, and the size effect is an important part of the study of droplet wettability on microstructure surfaces. Taking reentrant special-shaped microstructure and doubly-reentrant special-shaped microstructure as the research objects, the influences of many geometric parameters of microstructure on the wetting characteristics of droplet with low surface tension were obtained by numerical simulation and theoretical analysis, and the concept of critical intrinsic contact angle was proposed. It is found that the two kinds of special-shaped microstructures can suspend the droplet with low surface tension, and the droplet finally presents a large apparent contact angle. However, there are three kinds of wetting transition (Cassie state →Wenzel state transition) on the surface of the doubly-reentrant special-shaped microstructure, so the wetting regulation mechanism of the surface with the same geometric parameters is different from that of the reentrant special-shaped microstructure. In addition, by analyzing the energy barrier at the pinning point, it is further proved that the doubly-reentrant special-shaped microstructure has better performance of inhibiting the wetting transition of droplet.</p></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"1 ","pages":"Article 100001"},"PeriodicalIF":0.0,"publicationDate":"2023-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49709360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}