Article
Engineering, Environmental
Zhengyang Wang, Peng Liao, Xiaoqing He, Peng Wan, Bin Hua, Baolin Deng
Summary: Efficient removal of arsenic from drinking water is essential due to its high toxicity and carcinogenicity. A novel mass re-equilibrium process between two media with different adsorption characteristics can enhance overall arsenic removal efficiency.
Article
Chemistry, Medicinal
Evan Gildernew, Sungwoo Yang
Summary: A finite element model is developed to determine the performance of adsorption systems and guide the design of novel adsorbent structures and atmospheric water harvesting devices. The interaction between zeolite 13X and water vapor is described using various equation factors and relationships. Mitigation strategies are discussed to address anomalous behaviors at the microscale. The sensitivity of model inputs is analyzed and the total micropore volume is found to have the highest correlation with water uptake.
JOURNAL OF CHEMICAL INFORMATION AND MODELING
(2022)
Article
Biochemistry & Molecular Biology
Ensan Waatriah E. S. Shahrin, Nur Alimatul Hakimah Narudin, Nurulizzatul Ningsheh M. Shahri, Sera Budi Verinda, Muhammad Nur, Jonathan Hobley, Anwar Usman
Summary: This study investigated the adsorption characteristics of Acid Blue 25 (AB25), a negatively charged dye, on pomelo pith (PP), and evaluated the adsorption mechanism and hydrogen bonding interactions on agricultural wastes. The results showed that pomelo pith could be used as an effective adsorbent to remove negatively charged synthetic dyes from wastewater.
Article
Chemistry, Physical
Mohammadreza Babazadeh, Milad Irannezhad, Hossein Abolghasemi, Seyed Behzad Hosseiniyan, Ali Ehsani
Summary: The present study evaluated the effect of external mass transfer on the high-rate adsorption system. The experimental results showed that surface diffusion is the dominant mechanism in the adsorption process, while pore volume diffusion can be neglected. By optimizing the surface diffusion coefficient and the external mass transfer coefficient, a better agreement between the model and experimental data can be achieved.
SURFACES AND INTERFACES
(2022)
Article
Engineering, Chemical
Ruba Munir, Khuram Ali, Syed Abbas Zilqurnain Naqvi, Muhammad Aamer Maqsood, Muhammad Zeeshan Bashir, Saima Noreen
Summary: The study successfully synthesized zinc oxide, copper oxide, manganese dioxide, and magnesium oxide nanoparticles from Leucaena leucocephala leaves for the removal of Reactive Golden Yellow-145 and Direct Red-31 dyes. The nanoparticles showed high adsorption capacities for both dyes. The study also investigated the effects of surfactants and electrolytes on dye adsorption.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Applied
Azmat Ullah, Muhammad Zahoor, Waqar Ud Din, Mian Muhammad, Farhat Ali Khan, Aamir Sohail, Riaz Ullah, Essam A. Ali, H. C. Ananda Murthy
Summary: This study found that the pre-treated black tea wastes (BTW) can effectively remove methylene blue from aqueous solution, with an optimal equilibration time of 3 minutes and an optimal dosage of 0.4 g of adsorbent. The pseudo-second-order kinetics model best explained the experimental data, while the Langmuir model fit the isotherm data better. The various organic functional groups on the surface of BTW played a significant role in the adsorption process, indicating its potential as a sorbent for removing other contaminants from water.
ADSORPTION SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Biswajit Bera, Sayak Saha Chowdhury, Vrushabh Rajendrabhai Sonawane, Sirshendu De
Summary: Aluminium substituted hydroxyapatite (Al-HAp) was synthesized in-situ on granular commercial wood charcoal for fluoride removal from groundwater. The adsorbent had high surface area and achieved the highest fluoride adsorption capacity among reported adsorbents. Batch studies and continuous column run experiments were conducted to investigate the adsorption efficiency under different conditions. A mass transport model based on porediffusion was used to simulate breakthrough behavior in fixed-bed column runs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Zhenjian Liu, Chao Pu, Xidong Du, Hong Yin, Yugang Cheng
Summary: The combined effects of surface chemistry and pore structure on water vapor adsorption characteristics of coal were studied. The results showed that water vapor adsorption depends on surface chemistry but not pore structure. The monolayer adsorption capacity decreases with increasing coal rank. The diffusion coefficient also decreases with coal rank, and the diffusion activation energy for high-volatile bituminous is higher than the other coals.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Thermodynamics
Baihe Guo, Jingchao Zhang, Yanlin Wang, Xiaolei Qiao, Jun Xiang, Yan Jin
Summary: The use of fly ash to prepare aerogel support for CO2 adsorption was studied. The results showed that the aerogel support made from fly ash had good microscopic properties and achieved high adsorption capacity under certain conditions.
Article
Green & Sustainable Science & Technology
Angel Villabona-Ortiz, Candelaria Tejada-Tovar, Angel Dario Gonzalez-Delgado
Summary: Hexavalent chromium is a highly toxic contaminant that poses serious health risks to humans and the environment. This study aims to environmentally eliminate hexavalent chromium using bioadsorption with various agricultural residues. The optimized conditions for adsorption were determined using response surface methodology, and the adsorption capacities of different bioadsorbents were evaluated. The results showed that the bioadsorbents effectively removed hexavalent chromium, and the adsorption process followed the Freundlich and Redlich-Peterson isotherm models.
Article
Chemistry, Physical
Sesegma Ts. Khankhasaeva, Sayana V. Badmaeva, Marina V. Ukhinova
Summary: The adsorption of diclofenac (DCF), a common pharmaceutical pollutant, on Fe2O3-pillared montmorillonites (Fe-PMts) was studied. Fe-PMts were synthesized by intercalation of natural montmorillonite with iron polyoxocations. The pillaring process significantly increased the specific surface area and sorption capacity of the clay. The pH, sorbent content, DCF concentration, and temperature were found to be the main factors affecting DCF adsorption. The kinetic data and adsorption isotherm were analyzed using various models, and the results showed that the adsorption followed pseudo-second order kinetics and Langmuir isotherm. The thermodynamic parameters indicated that the adsorption of DCF on Fe-PMt was spontaneous and exothermic. Fe-PMt was proven to be an effective and environmentally friendly sorbent for DCF removal in pharmaceutical wastewater treatment.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Chuncai Yao, Chenxi Zhu
Summary: A new multi-mechanism kinetic model for batch adsorption is proposed in this study, where a dimensionless parameter serves as a mechanism indicator. The model can convert to different adsorption kinetics models as the dimensionless parameter changes values. The estimated mass transfer coefficients show a reasonable agreement with literature values.
SURFACES AND INTERFACES
(2021)
Article
Engineering, Chemical
George Kalaba, James Nyirenda, Onesmus Munyati
Summary: Contamination of water by heavy metals and organic waste is a major challenge in developing countries. In this study, activated carbons prepared from biomass waste in Zambia were used as filters to remove heavy metals and organic pollutants from water. The results showed that different activated carbons had varying efficiencies in removing heavy metals, with maize cob activated carbon exhibiting the highest adsorption efficiency. Furthermore, maize cob activated carbon was effective in removing methylene blue. Therefore, maize cob activated carbon is of great importance for water purification.
DESALINATION AND WATER TREATMENT
(2022)
Article
Engineering, Chemical
Hassan Sawalha, Aseel Bader, Jinan Sarsour, Maher Al-Jabari, Eldon R. Rene
Summary: The main aim of this study was to investigate the use of locally available biomass wastes in Palestine as adsorbents for treating wastewater containing methylene blue (MB). Eight different biomasses were tested, and the effects of pH, initial MB concentration, and adsorbent dosage on the adsorption capacity and kinetics were studied. The results showed that the efficiency of natural adsorbents and biochar varied depending on the biomass type, with peanut hulls and jute sticks demonstrating the highest removal efficiency. After chemical activation, a significant increase in adsorption efficiency was observed for most adsorbents, with sunflower shells being the most efficient. The study confirms the technical feasibility of using adsorption technology with local biomass wastes to treat dye-containing wastewater.
Article
Energy & Fuels
Goutam Kishore Gupta, Monoj Kumar Mondal
Summary: This study investigates the use of sagwan sawdust biochar as an efficient adsorbent for the removal of Cr(VI). Experimental variables such as solution pH, initial Cr(VI) concentration, temperature, adsorbent dose, and contact time were studied to optimize the adsorption process. The surface characteristics of the adsorbent were analyzed to determine the adsorption mechanism. The results suggest that sagwan sawdust biochar is satisfactory and effective in removing Cr(VI) from aqueous solution.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Transportation
Xiangxia Ren, Jun Zhang, Shuchao Cao, Weiguo Song
Summary: The increasing aging population presents a global challenge, making it crucial to study the dynamic behavior of the elderly group. This study examines the impact of horizontal interactions between neighbors on stepping behaviors, considering factors such as density and speed. Results show that higher density leads to a stronger negative influence on step length, and that lateral interaction significantly affects step size and speed in elderly pedestrians.
TRANSPORTMETRICA A-TRANSPORT SCIENCE
(2023)
Article
Transportation
Yanghui Hu, Xiangxia Ren, Jun Zhang, Weiguo Song
Summary: Investigating pedestrian dynamics is important in designing pedestrian facilities and developing crowd management plans. This study shows that social groups have an impact on pedestrian movement characteristics but do not significantly affect pedestrian dynamics at the macro level.
TRANSPORTMETRICA A-TRANSPORT SCIENCE
(2023)
Article
Chemistry, Physical
Shunmin Ding, Dan Cheng, Weiming Xiao, Xiaohua Ma, Rong Zeng, Senqun Liu, Sanqi Liang, Chao Chen, Wei-Guo Song
Summary: In this study, stable carbon nanotube encapsulated metallic nickel catalysts were successfully prepared and exhibited excellent stability and reusability in the hydrogenation reaction.
Review
Chemistry, Multidisciplinary
Kingsley John, Martins O. Omorogie, Ajibola A. Bayode, Aderemi T. Adeleye, Brigitte Helmreich
Summary: Microplastics and their additives are a major concern for their toxicity to the environment and public health. Advanced oxidation processes (AOPs) have been proven to be more effective in removing microplastics and their additives compared to traditional methods, although there is limited research on their application. This review investigates the degradation of common microplastics and additives using different AOPs and identifies reactive oxygen species as a key driver for AOPs' efficiency. The complete removal of environmental microplastics and their additives shows promising results with AOPs.
Article
Chemistry, Multidisciplinary
Jia Yu, Weiming Chen, Feng He, Weiguo Song, Changyan Cao
Summary: The interfacial interaction between carbon-supported catalysts and graphdiyne-supported cuprous oxide nanoclusters is demonstrated in this study, leading to a new type of electronic oxide-graphdiyne strong interaction. This interaction stabilizes the nanoclusters in a low-oxidation state without aggregation and oxidation, and improves catalytic activity through optimized adsorption energy for reactants/intermediates. This research contributes to the comprehensive understanding of interfacial interactions in supported catalysts.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Hongqiang Jin, Peixin Cui, Changyan Cao, Xiaohu Yu, Runqing Zhao, Ding Ma, Weiguo Song
Summary: Regulating the density of metal single atoms and exploring their interaction can enhance the performance of single-atom catalysts (SACs). In this study, a series of Cu SACs with densities ranging from 0.1 to 2.4 atoms/nm2 were produced. It was found that the catalytic activity in the benzene hydroxylation reaction was proportional to the Cu single-atom density. Mechanistic studies revealed that the interactions among neighboring single-atom moieties in ultra-high-density Cu SACs altered the electronic structures of Cu single atoms, resulting in stronger center dot OH adsorption, which improved the benzene hydroxylation reaction by suppressing the formation of O2.
Review
Biotechnology & Applied Microbiology
Ajibola A. Bayode, Eric T. Anthony, Odunayo T. Ore, Moses O. Alfred, Daniel T. Koko, Emmanuel Unuabonah, Brigitte Helmreich, Martins O. Omorogie
Summary: The growing demand for water sources due to the advent of civilization and industrialization has led to contamination caused by anthropogenic activities. In order to provide clean water, researchers are exploring the use of low-cost agricultural materials such as Carica papaya seed (CPS) to remove organic, inorganic, and microbial contaminants. This review discusses the composition of CPS, its adsorption capacity, and efficiency in removing contaminants, as well as factors affecting its effectiveness. The reusability of CPS and its potential in eliminating contaminants from water sources are also highlighted.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
Article
Environmental Sciences
Xue Rui, Ziqiang Li, Yang Cao, Ziyang Li, Weiguo Song
Summary: With the rapid growth of remote sensing data, deep learning models face the challenge of domain shift. Existing methods mainly focus on class-incremental learning and neglect the investigation into incremental domains in remote sensing. To address this, we propose a domain-incremental learning method for semantic segmentation in multi-source remote sensing data.
Article
Transportation
Xiangxia Ren, Han Xu, Jun Zhang, Weiguo Song, Kechun Jiang
Summary: With the increasing aging population, the efficiency of elderly people's traffic has gained attention. A collaborative movement model, based on collision-free speed model, has been developed for young people to assist the elderly. The model has been validated through controlled experiments and exhibits high reliability in both macroscopic characteristics and microscopic parameters. The model reproduces stable space and movement characteristics of the assisted group, and helps understand movement differences and coordination mechanisms of the assisted group.
TRANSPORTMETRICA A-TRANSPORT SCIENCE
(2023)
Article
Transportation
Hongliu Li, Long Xia, Jun Zhang, Weiguo Song, Kwok Kit Richard Yuen
Summary: This study investigates the movement characteristics of 40 preschool children in a 1.0 m wide corridor under low and high motivations. It found that the individual speed of children decreases with increasing density, both in normal and emergency conditions. In the turning region, running children prefer the inner boundaries while walking children prefer the outer boundaries. These findings contribute to a better understanding of preschool children's movement characteristics.
TRANSPORTMETRICA A-TRANSPORT SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Ajibola A. Bayode, Mercy T. Folorunso, Brigitte Helmreich, Martins O. Omorogie
Summary: The persistent increase in the amount of nonsteroidal anti-inflammatory drugs such as ibuprofen (IBP) and diclofenac (DCF) in water bodies is alarming, calling for immediate action. A bimetallic plantain-based adsorbent (CZPP) and its modified form (CZPPrgo) were synthesized and found to be effective in removing IBP and DCF from water. The adsorption process was optimized by varying the initial concentration of pollutants, adsorbent dose, and pH. CZPPrgo showed the highest adsorption capacities, and the removal of IBP and DCF followed the pseudo-second order kinetics and Freundlich isotherm model. The reuse efficiency of CZPPrgo was above 80% even after four adsorption cycles, making it a promising adsorbent for water treatment.
Review
Chemistry, Analytical
Kingsley I. John, Martins O. Omorogie, Aderemi T. Adeleye, Ajibola A. Bayode, Brigitte Helmreich
Summary: This review focuses on the global distribution and impact of microplastics (MPs), providing an overview of their dissemination, effects on humans and the ecosystem, as well as classification of analytical techniques for identification and quantification. The review also discusses possible approaches for MPs removal and suggests perspectives for improving analysis, coverage, and sustainable pollution control.
JOURNAL OF ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Hongqiang Jin, Peixin Cui, Changyan Cao, Xiaohu Yu, Runqing Zhao, Ding Ma, Weiguo Song
Summary: Regulating the density of metal single atoms and exploring their interaction can enhance the performance of single-atom catalysts. In this study, copper single-atom catalysts were synthesized and it was found that the catalytic activity is proportional to the density of copper single atoms. Mechanistic studies revealed that the interactions among neighboring single-atom moieties in high-density copper single-atom catalysts alter the electronic structures, leading to improved adsorption and suppressing side reactions. The ultrahigh-density copper single-atom catalyst exhibited significantly higher activity and utilization efficiency compared to previous reports, providing a practical catalyst for phenol production.
Article
Engineering, Chemical
Ajibola A. Bayode, Hamza Badamasi, Johnson Adedeji Olusola, Solomon S. Durodola, Olaniran K. Akeremale, Odunayo T. Ore, Brigitte Helmreich, Martins O. Omorogie
Summary: The excessive presence of phosphate poses significant environmental challenges worldwide. This study developed a novel adsorbent that effectively removes phosphate through multiple mechanisms and achieves maximum adsorption at pH 3.0. Furthermore, these cost-effective adsorbents can be regenerated, making them highly applicable.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Review
Engineering, Environmental
Aderemi Timothy Adeleye, Kingsley Igenepo John, Brigitte Helmreich, Martins O. Omorogie
Summary: This review focuses on the remediation strategies of Ivermectin (IVM), with adsorption being the most widely adopted technique. Various adsorbents and their performance for IVM adsorption are discussed. Additionally, the use of photocatalytic techniques for mineralizing IVM is highlighted.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)