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Article
Engineering, Chemical
Yalan Zhang et al.
Summary: Bentonite was selected as a coagulant aid, and chitosan-modified bentonite combined with polyglutamic acid was used for enhanced coagulation treatment for starch wastewater. The combination of bentonite, chitosan modification, and polyglutamic acid as a flocculant can effectively and deeply remove pollutants in starch wastewater.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Alex Nikolov et al.
Summary: This paper explores two models for dispersion stability theory. The classical DLVO model considers the attractive London-van der Waals interaction and electrostatic repulsive interaction in the frame of the Debye-Huckel theory. The solvent, an aqueous electrolyte solution, is treated as the continuous phase. Henderson and Lozada-Cassou (HC) use statistical mechanics to calculate the film free energy and predict dispersion stability by considering hard spheres immersed in a fluid of dispersed small particles. HC's theoretical approach also explains the stability of complex fluid films and discusses the differences between solvation oscillatory layering forces and colloidal oscillatory structural forces. The application of the DLVO model to dispersion stability is critically reviewed, and the role of nanobubbles in dispersion stability is discussed.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Ruolin Wang et al.
Summary: This study found that Pb-starch is an effective depressant for chlorite flotation, selectively decreasing its flotation rate and recovery. The zeta potential of chlorite surface increases with the treatment of Pb-starch, and this increase is proportional to the dosage of lead nitrate. Using FTIR spectra and XPS measurement, it was determined that starch and Pb-starch chemisorb onto chlorite, with the functional group of starch being hydroxy and Pb-starch being Pb-O group. Additionally, the optimal adsorption configuration was determined through DFT computation, with the glucose-Pb2+ complex adsorbing on the silica-terminated chlorite surface through three covalent bonds of Pb2+ and O atoms.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Environmental
Adriana S. Oliveira et al.
Summary: This study analyzes the use of aqueous phase reforming (APR) for producing green hydrogen from starch industry wastewater. It presents the direct conversion of high molecular weight biomass polymer in the wastewater, unlike previous literature focusing on low molecular weight substrates. The potential of different starch sources and catalyst types are evaluated, with PtRu/C and Pt/C catalysts achieving the highest H-2 yield values in APR experiments with synthetic wastewater. The flexibility of APR is demonstrated, and the performance is influenced by the starch source in real wastewaters.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Liqin Liu et al.
Summary: Recently, the preparation and applications of starch-based bio-latexes are facing challenges in terms of high concentration, high colloidal stability and high rheological performance. This study proposes a practical and effective strategy using cationic cellulose nanocrystals (CCNC) as carriers of alpha-amylase for the preparation of starch-based bio-latex (SBL) with improved hydrolysis efficiency even at 50 wt% concentration. The immobilized alpha-amylase on CCNC can regulate starch hydrolysis behavior and enhance colloidal stability and viscoelasticity. Additionally, CCNC provides multifunctional roles as dispersants, nano-fillers, and enhancers within starch colloids, improving the rheological properties and printability of SBL in pigmented coating and printing performance. This study offers a promising approach for efficient production of high-performance starch-based bio-latex and enhances the applications of cellulose nanocrystals in biomaterials.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Chemistry, Multidisciplinary
Ahmed I. Osman et al.
Summary: Access to drinkable water is increasingly challenging due to pollution and high cost of traditional water treatment methods. Biological sorbents made from biomass waste offer a promising and sustainable alternative. These sorbents effectively remove contaminants and promote circular economy. Different types of sorbents, preparation methods, adsorption mechanisms, and regeneration processes are discussed in this review.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Green & Sustainable Science & Technology
Xiangsong Meng et al.
Summary: This study proposed a new method for one-step removal of residual benzohydroxamic acid-lead (BHA-Pb) complex reagent from mineral processing wastewater (MPW) by utilizing metal ions combined with gangue minerals in tailings pulp. The concentration of BHA was characterized using chemical oxygen demand (COD). It was found that only Fe3+ could effectively remove the COD of the BHA-Pb solution, while Ca2+ and Al3+ could not. When gangue minerals were added to the BHA-Fe complex system, they aided in the sedimentation of the dark-colored BHA-Fe complex solution.
JOURNAL OF CLEANER PRODUCTION
(2023)
Review
Chemistry, Physical
Sanja Radovic et al.
Summary: This review summarizes low-cost technologies for the treatment of pharmaceutical-loaded wastewaters, focusing on the commonly found NSAIDs - diclofenac and naproxen. The evaluated technologies include adsorption, coagulation/flocculation, algal ponds, and constructed wetlands, as well as their hybridization/combination technologies. The review highlights the simplicity, availability, cost-effectiveness, environmental-friendliness, and high efficiency of these technologies for the removal of diclofenac and naproxen under environmentally relevant conditions. The results show that hybrid/combined systems can overcome the inhibition of coexisting species and achieve a higher removal rate compared to single technologies.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Environmental
S. G. Aspromonte et al.
Summary: The environmentally friendly synthesis of mesoporous silica using potato or corn starches as structure directing agents is reported. The starches were found to have ellipsoidal and irregular/polygonal morphologies, respectively. By controlling gelatinization and retrogradation of the starches, mesoporous silica with high specific surface areas were obtained, with 708.6 m2 g-1 for potato starch and 1018.1 m2 g-1 for corn starch. The materials showed a random mesoporous structure and exhibited CO2 adsorption capacities between 150.2 and 131.4 mg CO2 g-1 at 373 K.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Mani Govindasamy et al.
Summary: In this study, an enzyme-free electrochemical sensor based on orthorhombic bismuth molybdate nanoparticles decorated graphene oxide composite was developed for detecting hexestrol. Hexestrol is a non-steroidal estrogen with carcinogenic and toxic effects on the human body. The modified sensor showed high selectivity, reproducibility, and stability, and had a wide linear range and low limit of detection, making it suitable for real-time applications.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Junhao Fu et al.
Summary: This paper investigates the desorption of cadmium from zero valent iron (Fe-0) through ammoniacal leaching and the recycling of Fe-0. The results show that (NH4)2SO4 and NH3 center dot H2O solutions can effectively desorb cadmium from Fe-0. Cadmium forms Cd-NH3 complexes with free ammonia and is transferred into the leached solution, achieving desorption. The regenerated Fe-0 exhibits better cadmium adsorption capability compared to initial Fe-0.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Review
Green & Sustainable Science & Technology
Mohammed Shadi S. Abujazar et al.
Summary: This study highlights the recent advanced applications of hybrid coagulants in wastewater treatment. The performance of inorganic/inorganic hybrid coagulation demonstrated high removal efficiency compared to organic removal efficiency. The optimum operational conditions for inorganic/organic coagulants at different pH levels lowered the cost for chemicals used for pH adjustment in treating industrial wastewater.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Chemical
Ruofan Sun et al.
Summary: This study investigated the effects and mechanisms of Cu2+ and soluble starch (SS) in the flotation separation of fluorite and calcite. The results show that the combination of Cu2+ and SS can effectively depress calcite, while the impact on fluorite flotation is relatively small. Various analyses revealed that Cu2+ can react with SS to form a Cu-SS complex, leading to differential flotation performance between fluorite and calcite.
MINERALS ENGINEERING
(2022)
Article
Engineering, Chemical
Hua Zeng et al.
Summary: This study proposes a three-step process to improve the dewaterability and solid-liquid separation efficiency of bauxite residue (BR), and effectively coagulates and flocculates the BR particles through the synergy of PCE, lime, and PAM, thereby enhancing the BR dewaterability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Water Resources
Roya Zahedi et al.
Summary: The objective of this study was to investigate a simple and less expensive process for the removal of sulfate from wastewater. The ettringite precipitation process was used, and the optimum conditions for sulfate removal and Al(OH)(3) recovery were determined. The results showed that the method is highly feasible and cost-effective for sulfate removal from sulfate-containing industries' wastewater.
APPLIED WATER SCIENCE
(2022)
Article
Chemistry, Physical
Ruolin Wang et al.
Summary: The study achieved efficient flotation separation of scheelite from fine calcite by preparing aluminum-caustic starch. Aluminum-caustic starch showed high depressant effect and selectively changed the surface charge of fine calcite. It reacted with the anion of CO(3)(2-) on the surface of fine calcite, instead of reacting with the cation of Ca2+.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Environmental
Zhao Wei et al.
Summary: A novel metal-organic complex collector was developed for selective flotation of scheelite, achieving significant improvement in scheelite recovery in industry. The complex chemically adsorbed on scheelite surface, forming multilayer adsorbents to render the surface hydrophobic, while also reducing solution surface tension at the gas-liquid interface to stabilize foam formation. This high selectivity makes metal-organic complexes a promising collector for high-efficiency mineral flotation and contributes to efficient and clean mineral resource development.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Junhao Fu et al.
Summary: This study developed a novel technology using positively-charged and hydrophobic magnetic seeds to capture ultrafine scheelite particles, significantly improving the recovery of the ultrafine particles via magnetic separation. The modification of magnetite with lead complexes with benzohydroxamic acid induced a positively-charged hydrophobic surface, which facilitated the flocculation of ultrafine scheelite particles treated with sodium oleate. The particles mainly aggregated through electrostatic and hydrophobic interactions.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Engineering, Environmental
Fei Lyu et al.
Summary: The study employed a hydrothermal method to modify red mud, significantly enhancing its adsorption capacity for Pb(II) ions. The modified red mud formed a zeolite structure and mainly removed lead ions from aqueous solution by monolayer physical adsorption, showing high efficiency in adsorption performance.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Chemical
Liuyang Dong et al.
Summary: The efficient flotation separation of scheelite from calcite was achieved using a depressant system comprising iron ions (Fe3+) and citric acid (CA), where Fe3+/CA chemically adsorbed more strongly on the calcite surface. This depressant system has both theoretical and practical significance for the development and utilization of scheelite resources.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Chemistry, Physical
Junhao Fu et al.
Summary: The combination of tartaric acid and lead complexes of benzohydroxamic acid (Pb-BHA) was found to effectively separate scheelite from calcite. Tartaric acid showed stronger adsorption on the calcite surface, contributing to its high selectivity in separating scheelite. Pb-BHA adsorption on the calcite surface was significantly impacted by tartaric acid, but it could still be absorbed on the scheelite surface after interaction with tartaric acid.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Environmental Sciences
Chunjie Du et al.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2019)
Article
Engineering, Environmental
Hong Wang et al.
Review
Food Science & Technology
Shadrack Mubanga Chisenga et al.
JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
(2019)
Article
Chemistry, Physical
Tong Yue et al.
APPLIED SURFACE SCIENCE
(2019)
Article
Engineering, Chemical
Liuyang Dong et al.
SEPARATION AND PURIFICATION TECHNOLOGY
(2019)
Article
Environmental Sciences
Chunjie Du et al.
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Multidisciplinary Sciences
Ngoc Tuan Nguyen et al.
Article
Geochemistry & Geophysics
Tao Yue et al.
Article
Engineering, Chemical
Xiangsong Meng et al.
MINERALS ENGINEERING
(2018)
Article
Chemistry, Applied
Chukwunonso Peter Okoli et al.
CARBOHYDRATE POLYMERS
(2014)
Article
Engineering, Environmental
E. A. Lopez-Maldonado et al.
JOURNAL OF HAZARDOUS MATERIALS
(2014)
Article
Metallurgy & Metallurgical Engineering
Xiao-bin Li et al.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2013)
Review
Chemistry, Physical
Aleksandr V. Marenich et al.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2009)
Article
Physics, Multidisciplinary
John P. Perdew et al.
PHYSICAL REVIEW LETTERS
(2008)
