Article
Multidisciplinary Sciences
Dipesh Chandra, Md. Tamzid Hossain Molla, Md. Abul Bashar, Md. Suman Islam, Md. Shameem Ahsan
Summary: The physical and surface properties of sodium tripolyphosphate (TPP) and vanillin (V)-modified chitosan-based magnetic nano-sorbents (TPP-CMN and V-CMN) were characterized. FE-SEM and XRD analysis showed the average size of Fe3O4 magnetic nanoparticles between 6.50 and 17.61 nm. The TPP-CMN and V-CMN nano-sorbents exhibited high sorption capacity for heavy metal ions. The synthesis of these nano-sorbents and their efficient and cost-effective performance in wastewater treatment make them highly valuable. Rating: 8/10.
SCIENTIFIC REPORTS
(2023)
Article
Energy & Fuels
Cafer Saka, Ibrahim Tegin, Kubra Kahvecioglu, Omer Yavuz
Summary: In this study, a two-step method was employed to produce an effective adsorbent for the adsorption of cadmium (Cd) (II) and lead (Pb)(II). The method involved the preparation of activated carbon (AC) from almond shells using microwave heating and potassium hydroxide (KOH), followed by nitrogen and oxygen doping through hydrothermal treatment with nitric acid. The resulting materials were characterized and their adsorption performance, mechanism, kinetics, and thermodynamics were evaluated. The nitrogen- and oxygen-doped ACs exhibited good adsorption capacity for Cd (II) and Pb (II), with values of 106.38 mg/g and 76.33 mg/g, respectively.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Environmental Sciences
Mu Su, Feiyu Han, Mengxiao Wang, Jingxuan Ma, Xuewei Wang, Zhijun Wang, Shuijin Hu, Zhen Li
Summary: The study revealed that high CEC montmorillonite clay minerals can adsorb more bacterial cells, thus providing a certain level of protection for microorganisms against Pb2+ stress. However, the addition of Enterobacter sp. actually increased the residual Pb2+ concentration in the solution by 7.5%, indicating that the adsorption of typical soil bacterium on clay minerals has a certain impact on the adsorption of Pb.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Environmental Sciences
Yijing Xu, Hongmei Tang, Pingxiao Wu, Meiqing Chen, Zhongbo Shang, Jiayan Wu, Nengwu Zhu
Summary: The serious pollution of water by lead (Pb(II)) and cadmium (Cd(II)) poses a significant threat to ecological safety and requires urgent solutions. In order to improve the adsorption performance of pure hydroxyapatite, which has a relatively low adsorption rate for heavy metals, a series of manganese-doped hydroxyapatites (MnHAPs) were prepared. The presence of manganese influenced the formation and growth of hydroxyapatite crystals, resulting in lattice distortion and a large number of lattice defects. MnHAP-10, with a Mn/(Ca +Mn) molar ratio of 10%, exhibited the most effective removal of Pb(II) and Cd(II), with adsorption capacities of 1806.09 mg g-1 for Pb(II) at pH = 5 and 176.88 mg g-1 for Cd(II) at pH = 5.5. The adsorption behavior and mechanism were further investigated, indicating that Pb(II) was immobilized mainly through dissolution precipitation and ion exchange, while Cd(II) was adsorbed by ion exchange and electrostatic interaction. In conclusion, MnHAP-10 has great potential as an effective adsorbent for the removal of Pb(II) and Cd(II) pollution.
Article
Polymer Science
Jia Qu, Hongpu Huang, Qiang Yang, Wei Gong, Meilan Li, Liangliang Chang, Baoyue Cao, Guochun Zhang, Chunsheng Zhou
Summary: In this study, a magnetic oxidized micro/mesoporous carbon (MOMMC) was prepared for efficient removal of Cu(II) and Pb(II) from water. MOMMC exhibited excellent adsorption capacity and selectivity, and maintained high adsorption capacity after multiple adsorption-desorption cycles.
Article
Biotechnology & Applied Microbiology
Jun Dong, Peikun Jiang, Hailong Wang, Ruohui Lu, Yinxiu Liu, Yin Li, Yaping Gan, Nanthi Bolan
Summary: This study investigated the adsorption capacity of different biomass feedstocks for Pb(II) and the effect of magnetic modification on the adsorption capacity. Results showed that rice straw biochar had the highest adsorption capacity due to its rich mineral content and oxygen-containing functional groups. Magnetic modification improved the adsorption capacity of biochar by changing its surface properties. The study suggests that biochar could be a feasible and effective strategy for removing Pb(II) from wastewater.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Article
Biochemistry & Molecular Biology
Zhiying Shao, Jilai Lu, Jian Ding, Fengjiao Fan, Xinyang Sun, Peng Li, Yong Fang, Qiuhui Hu
Summary: The synthesized chitosan-pectin gel beads showed excellent adsorption performance for removing heavy metals from water. With good structural characteristics, mechanical strength, and stability, CPBs were found to have great reusability and potential for environmental protection and reuse.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Engineering, Environmental
Yanlin Ma, Zhaoping Deng, Zepeng Li, Quanzhi Lin, Yuhang Wu, Weisha Dou
Summary: This study reported the excellent performance of potassium titanate whiskers in adsorbing heavy metals in wastewater, with a focus on the adsorption kinetics and mechanism for various ions. The whiskers demonstrated good recyclability, maintaining over 70% adsorption capacity after five cycles.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Ping Sun, Wei Zhang, Binze Zou, Xiangyv Wang, Lincheng Zhou, Zhengfang Ye, Quanlin Zhao
Summary: By introducing PANI into the Fe3O4/ATP system, a high-efficiency adsorption material PANI@APTS-Fe3O4/ATP was prepared with excellent adsorption performance for Cu(II), Pb(II), and Ni(II). It shows fast equilibrium reaching in 15 minutes, magnetic properties, and good stability, making it potentially suitable for practical applications.
APPLIED CLAY SCIENCE
(2021)
Article
Engineering, Environmental
Yuehui Tan, Xirui Wan, Ting Zhou, Le Wang, Xianqiang Yin, Aisheng Ma, Nong Wang
Summary: The study compared the adsorption efficiency of a novel adsorbent KB/Zn-Fe made from kiwi branch biochar modified with Zn-Fe with original biochar for Pb(II) removal from wastewater. Results showed that KB/Zn-Fe had a higher maximum adsorption capacity for Pb(II) in aqueous solution compared to original biochar, and the adsorption capacity decreased with increasing biochar dose. Co-existence of NO3- had little impact on the absorptive capacity of KB/Zn-Fe, while Cl- enhanced the adsorption capacity. Multiple adsorption mechanisms by KB/Zn-Fe were identified, providing guidance for future production of biochar with efficient adsorption ability.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Biotechnology & Applied Microbiology
Lin Li, Yunfan Bai, Chuhua Qi, Yile Du, Xiaoxiao Ma, Yutong Li, Pingping Wu, Shuangli Chen, Sijing Zhang
Summary: A succinic anhydride-modified apple pomace (SAMAP) was synthesized to address environmental issues caused by the accumulation of apple pomace and effectively treat heavy metal ions. SAMAP exhibited high adsorption capacity for Cu(II) and Pb(II), suggesting its potential application in wastewater treatment.
BIOCHEMICAL ENGINEERING JOURNAL
(2024)
Article
Environmental Sciences
Guoyang Zhang, Zhichao Yang, Qing Teng, Yingqi Han, Suhong Zhang, Shengyu Liu
Summary: Green and efficient separation adsorbents are highly sought after for the treatment of heavy metal ions wastewater. In this study, xanthan gum (XG) supported by fly ash magnetic beads (FAMB) was used to create adsorbent XG@FAMB. The effects of XG@FAMB dosage, solution pH, adsorption time, and initial concentration of Pb (II) and Cu (II) on the adsorption performance were investigated, and the maximum adsorption capacity of XG@FAMB for Pb (II) and Cu (II) was found to be 14.93 mg/g and 14.88 mg/g, respectively. XG@FAMB exhibited a monolayer adsorption mechanism controlled by chemical action, where Pb (II) and Cu (II) were coordinated with oxygen-containing functional groups on the XG@FAMB surface and accompanied by electrostatic adsorption. XG@FAMB combines the environmental protection advantages of XG and the easy solid-liquid separation properties of FAMB, showing good removal efficiency for Pb (II) and Cu (II).
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Applied
Yu Zhang, Liang Zhang, Ruohui Gao, Lvling Zhong, Juanqin Xue
Summary: The polymer composite material PVA/BC/CaCO3 was developed for selective adsorption of toxic heavy metal ions such as Cd(II), Cu(II), and Pb(II) from solution. The adsorption kinetics data fit the pseudo-first-order kinetics model, while the thermodynamic adsorption data fit the Langmuir model. The maximum adsorption capacities for Cu(II), Pb(II), and Cd(II) were found to be 57.1, 513.6, and 238.6 mg/g, respectively, at 40 degrees C. This adsorbent also showed high recyclability, indicating its potential in removing heavy metal ions from contaminated solutions.
CARBOHYDRATE POLYMERS
(2021)
Article
Chemistry, Multidisciplinary
Jing Li, Zhuanjun Zhao, Yiran Song, Yang You, Jie Li, Xiuwen Cheng
Summary: The Mg-doped ferrihydrite-humic acid coprecipitation showed remarkable sorption capacity for Pb(II) and Cd(II) in aqueous solution, with the sorption mechanism involving surface adsorption, surface complexation and surface functional groups, as well as ion exchange and precipitation. This low-cost and high-performance adsorption material has a wide range of application prospects.
CHINESE CHEMICAL LETTERS
(2021)
Article
Biochemistry & Molecular Biology
Xiaoqi Liu, Yanyun Zhang, Yan Liu, Ting'an Zhang
Summary: In this study, chitosan bead grafted by third-generation dendrimers (CB-G3) with a diameter of 1.40 mm was synthesized and found to have excellent performance in recovering Ag(I), Cu(II), and Pb(II) ions in aqueous media. The optimum pH value was found to be 5, and the increased generation number of dendrimers contributed to an improvement in adsorption capacity. The adsorption processes can be described using pseudo-second-order kinetic and Langmuir models, and electrostatic interactions and hydrogen bonds are the main mechanisms between metal ions and N atoms.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Physical
Safa Benjedim, Jesica Castelo-Quiben, Esther Bailon-Garcia, El Mostapha Lotfi, Agustin F. Perez-Cadenas, Vaclav Slovak, Jiri Kalina, Francisco Carrasco-Marin
Summary: Activated carbon/TixOy nanoparticles were synthesized using controlled hydrolysis at mild temperature and pressure conditions. These materials exhibit high performance as visible-light driven photocatalysts, with the presence of carbon improving electron transfer efficiency and reducing electron-hole recombination to enhance photocatalytic activity.
Article
Environmental Sciences
F. Boumediene, O. Abdallah, B. Bensebia, V Slovak
Summary: This study focused on using oak and casuarina fruit shell biomass as adsorbents for the removal of copper ions and methylene blue. The highest adsorption capacity was found for activated casuarina for methylene blue and activated oak for copper ions. This research demonstrates that simple biomass-based materials can effectively treat industrial effluents.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Bara Komarkova, Marco Mattonai, Ilaria Degano, Vaclav Slovak
Summary: Analytical pyrolysis is an effective tool to study the thermal behavior of organic compounds, however, there is limited information on the pyrolysis of amines, especially when bound to inorganic systems. This study found that pure amines generated heavier nitrogen-containing compounds, while amines bound to titania nanoparticles produced unsaturated hydrocarbons and aromatics. The differences in pyrolysis mechanisms were attributed to the catalytic effect of the nanoparticles.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Chemistry, Applied
Gabriela Zelenkova, Tomas Zelenka, Vaclav Slovak
Summary: The study focuses on the effect of oxygen content in carbons on the amount of non-freezable pore water, showing that the quantity of non-freezable water increases with increasing oxygen content. By taking into account the surface chemistry of carbon materials, it was found that the thickness of the delta layer significantly increases with increasing amount of oxygen. The proposed approaches aim to make thermoporometry a widely-used method by estimating the width of the delta layer for specific materials.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Safa Benjedim, Luis A. Romero-Cano, Hesham Hamad, Esther Bailon-Garcia, Vaclav Slovak, Francisco Carrasco-Marin, Agustin F. Perez-Cadenas
Summary: Two alternative synthesis routes of magnetic adsorbents were evaluated for Pb(II) and Cd(II) removal, resulting in Fe3O4+C and CoFe2O4+C with high adsorption capacities. The interaction between -FeOH groups and cations in the solution played a key role in adsorption, maintaining high capacities even after regeneration cycles with HNO3. These new materials show promising potential for large-scale wastewater treatment processes.
Article
Chemistry, Physical
Madhav P. Chavhan, Vaclav Slovak, Gabriela Zelenkova, Damir Dominko
Summary: Hierarchical porous carbons are known for enhancing the electrochemical features of electrodes. This study explored the impact of carbonization temperature and activation type on the properties of carbon xerogels, finding that electrical conductivity is the primary factor affecting electrochemical performance, followed by surface oxygen content and meso-micropore connectivity. The way of activation also influenced pore connectivity and oxidation levels, resulting in different electrochemical behaviors.
Review
Polymer Science
Arjeta Kryeziu, Vaclav Slovak, Alzbeta Parchanska
Summary: This review summarizes the possible pathways of cellulose conversion to a liquid state suitable for the preparation of porous carbons, including hydrothermal liquefaction, less common decomposition techniques, and dissolution of cellulose without decomposition.
Article
Energy & Fuels
Madhav P. Chavhan, Vaclav Slovak, Chung-Hsin Lu
Summary: The research revealed the decisive roles of [OH-]/[Ni2+] molar ratios and calcination temperatures in controlling the morphology of NiO nanostructures, leading to the formation of hexagonal nanodisc shapes. Increasing the calcination temperature improved crystallinity but also reduced the BET area and pore volume.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Agricultural Engineering
Arjeta Kryeziu, Vaclav Slovak, Julien Parmentier, Tomas Zelenka, Severinne Rigolet
Summary: A simple and environmentally friendly method for transforming cellulose into porous carbon monoliths was developed. The method involves freezing the cellulose solution, followed by ethanol regeneration and water washing. The resulting cellulose monoliths exhibit significant macroporosity and microporosity.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Chemistry, Analytical
Bara Komarkova, Marco Mattonai, Ilaria Degano, Vaclav Slovak
Summary: Organic compounds bound to peroxotitanates can affect the photocatalytic activity of TiO2 nanoparticles after annealing. Understanding this influence is crucial for developing nanoparticles with desired catalytic behavior. A multi-analytical study was conducted to investigate the pyrolytic behavior of the organic fraction of amine-functionalized titania nanoparticles, revealing the formation of aromatic and heteroaromatic compounds during pyrolysis.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Thermodynamics
Gabriela Zelenkova, Vaclav Slovak
Summary: The quantitative TG-MS method was used to detect and quantify gases evolved during the thermal decomposition of ammonium salts, providing new insights into the decomposition mechanism of inorganic salts. The method was validated in the decomposition of simple compounds and used to determine the decomposition pathways of more complex compounds like ammonium sulphate and ammonium nitrate, showing the importance of such analysis for understanding gas mixtures.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Physical
Eva Kinnertova, Vaclav Slovak, Tomas Zelenka, Cyril Vaulot, Luc Delmotte
Summary: The porosity of differently wetted carbonaceous material with disordered mesoporosity was investigated using low-field H-1 NMR relaxometry. A non-linear optimization method was used to convert relaxation curves to the distribution of relaxation times. It was found that up to five different relaxation times were sufficient to describe the observed relaxation, corresponding to different types of hydrogen nuclei in the sample.
Article
Chemistry, Physical
Lucie Korena, Vaclav Slovak, Gabriela Zelenkova, Tomas Zelenka
Summary: The effects of porosity and particle size on carbon surface oxidation were investigated. Carbon xerogels with different porosity and particle size were prepared and characterized. Isothermal thermogravimetry experiments showed that particle size and porosity significantly influence diffusion and heat transfer during carbon oxidation. The apparent kinetic parameters were determined, and it was found that porosity and particle size do not affect the basic chemical reactions occurring on the carbon surface during oxidation.
Article
Polymer Science
Eva Kinnertova, Vaclav Slovak, Roman Marsalek, Martin Mucha
Summary: Different methods were used to study the kinetics and mechanism of resorcinol-formaldehyde (RF) condensation, yielding significantly different results and applicability. Fourier transform infrared spectroscopy (FTIR) can only track the changes in functional groups at the early stages of the reaction. Dynamic light scattering (DLS) can estimate the growth of particles in the reaction solution before it becomes more viscous. H-1 nuclear magnetic resonance relaxometry (H-1-NMR) provides insights into the properties of water present in the polymeric gel during RF condensation. Differential scanning calorimetry (DSC) measurement of the freezing/melting behavior of the reaction mixture has the widest range of applicability. These findings can enhance our understanding of the mechanism of RF condensation.
Article
Thermodynamics
Bara Komarkova, Monika Motlochova, Vaclav Slovak, Petra Ecorchard, Dmytro Bavol, Jan Subrt, Petr Bezdicka
Summary: This study investigates the thermal behavior of nanotitania precursors and the influence of amines and peroxide treatment on TiO2 properties. Results show that peroxide treatment increases initial particle size, while the choice of amine affects the formation temperature of anatase. Additionally, the size of anatase particles has a direct impact on rutile formation temperature.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Analytical
Guanshuai Zhang, Shanjian Liu, Dongmei Bi, Zhisen He, Jia Liu, Yinjiao Liu
Summary: Hydrogen peroxide pretreatment was applied for fast pyrolysis of corn stalks, and it was found that the pretreatment effectively promoted lignin depolymerization and decreased the reaction activation energy. The pretreatment also increased the cellulose content and removed alkali and alkaline earth metals from the biomass. The pH of the hydrogen peroxide solution affected the removal of lignin and ash by the pretreatment, and the composition of bio-oil changed significantly, with a significant increase in the relative content of levoglucosan after pretreatment.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2024)