Article
Engineering, Environmental
Arshid Bashir, Altaf Hussain Pandith, Lateef Ahmad Malik, Aaliya Qureashi, Firdous Ahmad Ganaie, Ghulam Nabi Dar
Summary: The study developed a novel Fe3O4@L-Cys nanoparticles as an efficient adsorbent for the removal of toxic metal ions in water. The experimental results showed that the adsorbent had a good removal effect on Pb(II) and Cr(VI), and selectively adsorbed cationic and anionic pollutants under different pH values.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Polymer Science
Mohamed Gouda, Hairul-Islam Mohamed Ibrahim, Amr Negm
Summary: A biologically active agent, named Zn-BTC@CS, based on a Zn-1,3,5-benzen tricarboxylic acid (Zn-BTC) framework incorporated into a chitosan (CS) biopolymer was successfully synthesized using a microwave irradiation technique. The synthesized Zn-BTC@CS showed a smooth surface morphology and a particle size diameter ranging from 20 to 40 nm. It exhibited anticancer efficacy against lung and colon cancer cell lines by inhibiting proliferation, inducing apoptosis, and inhibiting migration.
Article
Agricultural Engineering
Fangfang Wu, Long Chen, Peng Hu, Yunxiao Wang, Jie Deng, Baobin Mi
Summary: The study found that biochar derived from alkali lignin has superior adsorption performance, fast absorption rate, and high maximum adsorption capacity, making it suitable for pollution remediation.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Alusani Manyatshe, Zamani E. D. Cele, Mohammed O. Balogun, Thabo T. Nkambule, Titus A. M. Msagati
Summary: In this study, sugarcane bagasse biochar was used as a biosorbent for the removal of phosphate ions from aqueous solutions. The addition of chitosan and epichlorohydrin enhanced the adsorption capacity of the biochar. The bio-composite showed good adsorption performance and reusability, especially under acidic conditions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Biochemistry & Molecular Biology
Wendel Paulo Silvestre, Jocelei Duarte, Isabel Cristina Tessaro, Camila Baldasso
Summary: This study developed non-supported and PET-supported chitosan membranes and evaluated their physical-chemical, morphological, and mechanical properties, as well as their performance in separating ethanol/water and limonene/linalool mixtures. The presence of a PET layer enhanced the mechanical properties of the membrane, while the support layer influenced the hydrophilic pervaporation parameters. However, overall, both membranes had similar performance in terms of pervaporation separation index. Therefore, the choice of membrane depends on specific applications requiring durability, higher flux, and selectivity.
Review
Engineering, Biomedical
Zhongzheng Yu, Wen Kiat Chan, Yan Zhang, Timothy Thatt Yang Tan
Summary: The emergence of NIR-II activated photomedicines has significantly expanded the penetration depth for noninvasive theranostics; However, there is a lack of thorough review for NIR-II inorganic PTAs, with most comparisons made with NIR-I PTAs; This review aims to inspire further development of NIR-II activated inorganic PTAs with good photothermal conversion ability and potential biomedical applications.
Article
Agronomy
Jing Zhao, Lin Wang, Gang Chu
Summary: Attention has been paid to the application of biochar in the remediation of heavy metal contamination in soils. Two modification methods, bleaching and activation, were used to enhance the biochar sorption of Cu(II) and Pb(II). The study investigated the properties of bleached and activated biochars and discussed the main mechanisms of Cu(II) and Pb(II) sorption after modification using multiple techniques and density functional theory calculations. The results showed that both modifications had an excellent effect on sorption, especially the bleaching treatment. The study provides important guidance for the application of modified biochars in the sorption of heavy metals in the environment.
Article
Environmental Sciences
Mahmuda Akter, Noriko Hirase, Md. Tajuddin Sikder, Md. Mostafizur Rahman, Toshiyoki Hosokawa, Takeshi Saito, Masaaki Kurasaki
Summary: Lead (Pb) is a highly toxic heavy metal that can enter the biological system through the food chain, and lead ion (Pb (II)) can be released into the environment from natural and anthropogenic sources. Among various remediation techniques, adsorption is considered effective for its economic and versatile properties. The study showed that the CS-AC-PVA composite beads have better adsorption capacity for Pb (II) compared to lone CS, AC, and CS-AC beads, with a 44% increase compared to CA-AC beads. The adsorption capacity of CS-AC-PVA beads for Pb (II) was highest at 25 degrees C, following the Freundlich isotherm model with increasing concentrations and decreasing temperatures. This demonstrates the potential of CS-AC-PVA composite beads as an adsorbent for environmental remediation of Pb (II) from aqueous solutions.
WATER AIR AND SOIL POLLUTION
(2021)
Article
Environmental Sciences
Nur Syahirah Mohamed Hatta, Shiew Wei Lau, Han Bing Chua, Masahiro Takeo, Tushar Kanti Sen, Nabisab Mujawar Mubarak, Mohammad Khalid, Danial Aminin Zairin
Summary: This study evaluated the flocculation dewatering performance of a novel cationic chitosan-like bioflocculant (BF01314) produced from Citrobacter youngae GTC 01314. The results showed that BF01314 significantly improved the flocculation performance of activated sludge, reducing resistance and increasing sludge compactness. Furthermore, BF01314 showed good flocculation performance within a wide range of pH and temperature. Electrostatic charge patching and polymer bridging mechanisms were believed to be the dominant mechanisms during the sludge conditioning process of BF01314.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Zhukela Lin, Yiwei Hu, Yijun Yuan, Baowei Hu, Binliang Wang
Summary: Microplastics have the potential to concentrate and transport heavy metals in the aquatic environment, with the sorption behavior of heavy metals onto them being pH and ionic strength dependent. Among the tested materials, polyvinylchloride PVC showed the highest maximum sorption capacity for lead (II) under the experimental conditions.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Agricultural Engineering
Yue Zhang, Yongshan Wan, Yulin Zheng, Yicheng Yang, Jinsheng Huang, Hao Chen, Guixiang Quan, Bin Gao
Summary: Hydrochars derived from hydrothermal carbonization of hickory wood, bamboo, and wheat straw were modified with potassium permanganate for effective sorption of heavy metals. The modified wheat straw hydrochar (WSHyC-0.2KMnO(4)) exhibited the highest adsorption capacity, attributed to its large specific surface area, abundant surface oxygenic functional groups, and significant presence of MnOx microparticles. Batch adsorption experiments demonstrated that WSHyC-0.2KMnO(4) had a faster adsorption rate and much higher adsorption capacity (12-17 times) for Pb(II), Cd(II), and Cu(II) compared to WSHyC, due to increased OCFG and MnOx microparticles on its surface facilitating ion exchange, electrostatic interactions, and complexation mechanisms.
BIORESOURCE TECHNOLOGY
(2023)
Article
Soil Science
J. T. Padilla, H. M. Selim
Summary: The study investigated the competitive sorption and desorption of Zn, Ni, and Pb in acidic Olivier loam soil through stirred-flow experiments. It was found that metals with higher affinity could displace those with lower affinity. A two-site competitive kinetic model effectively described the experimental data and improved upon single-ion models in predicting competitive interactions between species in stirred-flow experiments.
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
(2021)
Article
Polymer Science
Mona A. Aziz Aljar, Suad Rashdan, Abdulla Almutawah, Ahmed Abd El-Fattah
Summary: Globally, water contamination by heavy metals is a serious problem that affects the environment and human health. Adsorption is the most efficient way of water treatment for eliminating heavy metals. In this study, a PVA-CS/CE composite hydrogel adsorbent was prepared for the removal of Pb(II), Cd(II), Zn(II), and Co(II) from water. The adsorbent exhibited a spherical shape, robust structure, and suitable functional groups for heavy metal adsorption.
Article
Engineering, Environmental
Khondaker M. N. Alam, Evert J. Elzinga
Summary: Batch kinetic experiments combined with XAS were conducted to investigate the sorption behavior of Mn-(II), Co-(II), Ni-(II), Zn-(II), and Cd-(II) with sulfated green rust (GR) in anoxic suspensions at pH 8. The results showed that all five divalent metals coordinated at Fe-(II) sites of the GR sorbent. However, there were differences in the sorption behavior, with Mn-(II) and Cd-(II) showing limited uptake and Co-(II), Ni-(II), and Zn-(II) exhibiting extensive sorption throughout the experimental time frame. This was attributed to differences in affinity and extent of substitution in Fe-(II) sites of the GR lattice controlled by ionic size.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jinling Gao, Mingzhe Song, Tongtong Li, Yuyao Zhao, Anxu Wang
Summary: In this study, a nanocomposite material for removing toxic metals from water was prepared by modifying carbon nanotubes and its adsorption performance and mechanism were investigated. The results showed that the nanocomposite material exhibited high adsorption capacity and rate, making it suitable for applications in industrial wastewater treatment and chemical waste management.
Article
Materials Science, Ceramics
Taihao Han, Eslam Gomaa, Ahmed Gheni, Jie Huang, Mohamed ElGawady, Aditya Kumar
Summary: In this study, a machine learning model is used to predict the compressive strength of AAMs based on their initial physicochemical attributes. The prediction performance of the model is improved by combining multiple compositional descriptors of the aluminosilicate into a composite chemostructural descriptor.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Engineering, Chemical
Yusuf G. Adewuyi, M. Arif Khan
Summary: This study investigates the removal of nitrogen oxides (NO) and sulfur dioxide (SO2) using heat-activated peroxydisulfate in the presence or absence of SO2. The results show that the presence of SO2 significantly enhances the removal of NO. This research provides valuable guidance for designing efficient flue gas treatment systems.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Adnan Raza Altaf, Yusuf G. Adewuyi, Haipeng Teng, Liu Gang, Fazeel Abid
Summary: This study synthesized multiple sorbent materials and improved the Hg-0 removal performance from coal syngas by applying citric acid/ultrasonic treatment. TSCUF0.3 demonstrated the highest Hg-0 capturing performance and the removal mechanism was proposed. The active Hg-0 removal performance was attributed to the valence Fe3O4 and lattice oxygen content on the sorbent surface, as well as the activation by H2S/HCl gases. This work provides a practical approach for utilizing cheap and eco-friendly tea waste to control Hg-0 emission.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2022)
Article
Green & Sustainable Science & Technology
Sukanta K. Mondal, Carrie Clinton, Hongyan Ma, Aditya Kumar, Monday U. Okoronkwo
Summary: To promote the sustainable development of eco-efficient calcium sulfoaluminate (CSA) cements, the effects of coal fly ashes on the properties of CSA-based cement paste were investigated. Both Class C and Class F fly ashes were studied and were found to improve the workability and accelerate the hydration of CSA cement paste. The addition of fly ash reduced the 1-day compressive strength but increased the 28-day strength, with Class C fly ash showing higher strength due to a higher degree of reaction and more cohesive binding C-S-H-based gels formed.
Article
Computer Science, Artificial Intelligence
Taihao Han, Sai Akshay Ponduru, Arianit Reka, Jie Huang, Gaurav Sant, Aditya Kumar
Summary: The dissolution kinetics of tricalcium silicate (C3S) in undersaturated solvents can be accurately predicted using the deep forest (DF) model, which takes into account various variables such as measurement method, temperature, and physicochemical properties of solvents.
Article
Construction & Building Technology
Taihao Han, Rohan Bhat, Sai Akshay Ponduru, Amit Sarkar, Jie Huang, Gaurav Sant, Hongyan Ma, Narayanan Neithalath, Aditya Kumar
Summary: This study uses a deep forest model to predict the composition- and time-dependent hydration kinetics and compressive strength of [PC + FA] binders. Data dimensionality-reduction and segmentation techniques are employed to enhance the model's prediction performance, and a simple analytical model is developed to predict compressive strength and reveal the correlations between mixture design and compressive strength of [PC + FA] binders.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Chemistry, Physical
Keitumetse Monyake, Taihao Han, Danish Ali, Lana Alagha, Aditya Kumar
Summary: The study used artificial neural network (ANN) and random forests (RF) machine learning models to predict the efficiency of synthesized chitosan-polyacrylamide copolymers (C-PAMs) in the depression of iron sulfide minerals while valuable base metal sulfides were floated in the froth flotation process. The RF model showed higher accuracy in predicting the depression of pyrite compared to the ANN model. Fundamental investigations on the surface chemistry of C-PAMs at the mineral-water interface were also conducted to gain insights into the behavior of different metal sulfides during flotation.
COLLOIDS AND INTERFACES
(2023)
Article
Construction & Building Technology
Kamran Aghaee, Taihao Han, Aditya Kumar, Kamal H. Khayat
Summary: Expansive agent (EA) and shrinkage reducing admixture (SRA) are used to reduce shrinkage and cracking in concrete. However, high contents of EA and SRA can impair the microstructure of concrete. This study investigates the effect of using EA, SRA, and their combination on the mechanical, shrinkage, and microstructural properties of fiber-reinforced mortar (FRM).
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Geochemistry & Geophysics
Taihao Han, Bryan K. Aylas-Paredes, Jie Huang, Ashutosh Goel, Narayanan Neithalath, Aditya Kumar
Summary: This study explores the prediction of compressive strength in limestone calcined clay cement (LC3) using a machine learning model. Three feature reduction methods are employed to analyze the impact of LC3 components and mixture design on compressive strength. Practical guidelines for applying these methods on cementitious materials are provided, and a feature enhancement method is utilized to improve prediction accuracy.
Article
Materials Science, Multidisciplinary
Peter O. O. Aina, Sukanta K. K. Mondal, Joshua Costain, Ali A. A. Rownaghi, Fateme Rezaei
Summary: The design and development of polymeric composites that can effectively capture and destruct toxic chemicals with a fast detoxification rate is of high importance. Zr(OH)(4)-incorporated Ultem, Matrimid, and PIM-1 composites were synthesized and assessed for detoxification of DMNP. Increasing Zr(OH)(4) loading enhances the hydrolysis rate and the amount of DMNP converted for all three polymers. 30%-Zr(OH)(4)@PIM-1 exhibits the best performance with a hydrolysis rate of 5.5 x 10(-3) μmol/s at room temperature and achieves 100% conversion in 2 hours.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Juan Carlos Vega-Vila, Advait Holkar, Ross A. Arnold, Dale P. Prentice, Shiqi Dong, Longwen Tang, Erika Callagon La Plante, Kirk Ellison, Aditya Kumar, Mathieu Bauchy, Samanvaya Srivastava, Gaurav Sant, Dante Simonetti
Summary: This study investigates the adaptable nature of metal cations during hydrothermal synthesis by synthesizing porous materials without organic structure-directing agents. The results show that phillipsite is crystallized selectively in the presence of sodium and potassium, while partial substitution of sodium and potassium with calcium results in the co-precipitation of tobermorite phases. Exclusive tobermorite precipitation is observed when only calcium is used. These findings demonstrate the important role of metal cations in crystallization processes and their ability to vary framework topology in porous materials.
REACTION CHEMISTRY & ENGINEERING
(2023)
