Article
Chemistry, Multidisciplinary
Mingdong Li, Jiawei Wang, Bibo Gou, Dejin Fu, Haifeng Wang, Pingyuan Zhao
Summary: This paper investigates the adsorption performance of different crystal forms of MnO2 on heavy metal ions in high-concentration metal salt solution. It is found that the equi-acidity point pH of different crystalline MnO2 varies, which is mainly influenced by the complexation of surface hydroxyl. By controlling the pH, more hydroxyl groups can participate in the adsorption reaction, thereby increasing the adsorption rate of MnO2 on heavy metal ions.
Article
Agricultural Engineering
Zhilin Zhang, Yan Li, Lei Ding, Jian Yu, Qiang Zhou, Yanli Kong, Jiangya Ma
Summary: The study examined the use of NaHCO3-activated biochar for tetracycline removal from wastewater, identifying optimal preparation conditions and factors influencing the process. The adsorption mechanism involving electrostatic attraction, hydrogen bonding, π-π interactions, and pore-filling was proposed, providing guidance for sludge disposal and tetracycline removal in practical applications.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Xin Zhang, Yaru Li, Mengru Wu, Yao Pang, Zhenbing Hao, Mian Hu, Rongliang Qiu, Zhihua Chen
Summary: The Fe/Mn oxides loaded biochar (FeMn-BC) was prepared to enhance the adsorption of tetracycline (TC), with gamma-Fe2O3 and MnO2 playing a dominant role. The adsorption process was best described by the Elovich kinetic and Langmuir isotherm models, with a maximum capacity of 14.24 mg/g. The FeMn-BC showed potential for TC removal in column tests and actual wastewater, with concentrations of leached Fe and Mn meeting the required standards after adsorption.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
I-Chi Li, Yin-Hong Chen, Yung-Chung Chen
Summary: A series of interpenetrating polymer network sodium alginate-g-poly(sodium acrylate) hydrogels were synthesized through thermal radical polymerization. The hydrogels exhibited high ammonia nitrogen adsorption capacity and satisfactory reusability.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Agricultural Engineering
Jiayi Tang, Yongfei Ma, Zhikang Deng, Ping Li, Xuebin Qi, Zulin Zhang
Summary: In this study, a new composite adsorbent (BC-MA) was developed by impregnating bio-waste bagasse with magnesium-aluminum layered double oxides for the removal of tetracycline (TC). BC-MA exhibited a high adsorption capacity of 250.6 mg g(-1) due to its developed porous structure, large surface area, and reinforced functional groups. BC-MA showed excellent adsorption capacity in diverse water environments and sustainable regeneration ability. The adsorption process of TC by BC-MA was spontaneous and endothermic, and intraparticle diffusion was the rate-limiting stage. The proposed mechanisms involved pi-pi interactions, pore filling, complexation, and hydrogen bonding. These findings suggest that the synthesis of modified biochar from bagasse offers new opportunities for waste resource reuse and water pollution control.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Uziel Ortiz-Ramos, Roberto Leyva-Ramos, Esmeralda Mendoza-Mendoza, Antonio Aragon-Pina
Summary: This study investigated the adsorption of tetracycline onto different clays and analyzed the adsorption mechanisms and influencing factors. Bentonite showed the highest adsorption capacity due to its swelling characteristic, interlayer cations, and tetracycline molecular size. Adsorption occurred on the external surface and in the interlayer space of bentonite, with both physical and chemical mechanisms involved. The adsorption process was partially reversible and endothermic.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Magdalena Bobik, Irena Korus, Karol Synoradzki, Jacek Wojnarowicz, Dorota Binias, Wlodzimierz Binias
Summary: In this study, two types of magnetite nanoparticles were synthesized and characterized. Both types of nanoparticles exhibited nanoscale particle sizes and superparamagnetic properties. The presence of PSA functional groups in the modified magnetite was confirmed, resulting in a lower pH of the isoelectric point. Both types of magnetite showed effective metal ion adsorption, with slight differences in their ability to adsorb cations and anions. The adsorption processes were well-described by the Langmuir and Freundlich models, with chemisorption identified as the predominant process. The adsorption of all metal ions followed a pseudo-second-order kinetic model.
Article
Agricultural Engineering
Qiao Chang, Amjad Ali, Junfeng Su, Qiong Wen, Yihan Bai, Zhihong Gao
Summary: In this study, a Mn(II) oxidizing-denitrifying and tetracycline (TC) removal bacterium Zoogloea sp. MFQ7 was isolated, showing high nitrogen removal efficiency and the ability to remove nitrate, Mn(II), and TC. Biogenic manganese oxides (BMO) synthesized by MFQ7 exhibited a high adsorption capacity for TC and displayed endothermic and spontaneous characteristics.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Huijin Li, Zhuodi Yuan, Shuang Ding, Jie Yuan
Summary: Magnetic biochar (MBC) is widely used for contaminant removal due to its ease of recovery and separation. However, magnetic modification decreases the surface area of biochar, resulting in limited improvement in adsorption performance. This study investigated the changes in physicochemical characteristics of modified MBC and evaluated its ability to remove Pb2+ from contaminated water. Ball milling modification greatly enhanced the adsorption performance of MBC by increasing the number and surface area of functional groups.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Dongliang Yang, Feipeng Cheng, Le Chang, Dengfeng Wu
Summary: Developing efficient and low-cost adsorbent for removing heavy metal ions from aqueous solution is crucial for environmental protection. In this study, low quality natural bentonite was purified and sodium-modified to enhance its adsorption capacity for Pb2+. The optimized adsorption conditions were pH = 5, adsorbent dosage of 0.2 g, initial Pb2+ concentration of 400 mg/L, and adsorption time of 120 min. The adsorption process followed Freundlich isotherm and pseudo-second-order kinetics adsorption equations. Adsorption pathways of Pb2+ on sodium bentonite included ion exchange, surface hydroxyl functional group capture, electrostatic attraction, and chemical precipitation. This research provides technical support for the wider application of bentonite as an adsorbent material.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Multidisciplinary
M. Liu, Y. Gao, Y. Wang, Y. Li, D. Zou
Summary: This article discusses the severe ecological effects and health hazards caused by antibiotics, especially tetracyclines (TCs), as emerging contaminants in aquatic environments. It highlights the potential of metal-organic frameworks (MOFs) as versatile porous materials for the adsorptive removal or photocatalytic degradation of TCs. The article also summarizes recent advances in this field and examines the possible interactions and mechanisms involved. Finally, it provides outlooks on the efficient removal of TCs using MOFs and MOFs-based composites.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Polymer Science
Cynthia G. Flores-Hernandez, Maria de los Angeles Cornejo-Villegas, Abigail Moreno-Martell, Alicia Del Real
Summary: The study aimed to obtain a new biodegradable graft polymer through two chemical processes, FTIR and TGA analysis confirmed its structure and thermal properties, with strong impact on fungal growth.
Article
Engineering, Chemical
Yan Liu, Jiajia Fu, Jinsong He, Bo Wang, Yan He, Ling Luo, Lilin Wang, Chao Chen, Fei Shen, Yanzong Zhang
Summary: The ZIF-8@rGO aerogel efficiently removes tetracycline from water with excellent adsorption capacity. The adsorption mechanism involves hydrogen-bonding interactions, pi-pi interaction, and electrostatic attraction for pollutant removal.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Agricultural Engineering
Yan Chen, Shen-Ao Huang, Kun Yu, Jian-Zhong Guo, Yu-Xuan Wang, Bing Li
Summary: In this study, two acrylate-modified hydrochars were synthesized by grafting acrylic acid onto the surface of hydrochars. The hydrochars used were carbonized in water and acidic medium, respectively. It was found that one of the hydrochars was more prone to free radical polymerization and had a higher carboxylate content after modification. The modified hydrochar showed higher adsorption capacity for methylene blue and lead ions. The adsorption mechanism involved complexation, ion exchange, electrostatic interaction, H-bonding, and p-p interaction. This study suggests that one-step modification method has great potential for preparing carboxylate-modified hydrochars for cationic pollutant adsorption.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Guo Liu, Bing Liao, Xinyu Quan, Wen Xu, Tao Lu, Xuying Deng, Jing Liu
Summary: In this study, a Fe-Mn bimetal nanocomposite was prepared and proved to be effective for removing tetracycline from wastewater. The nanoparticles showed high paramagnetic properties and the reaction mechanism involved center dot OH and center dot O-2.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Environmental Sciences
Awoke Guadie, Abaynesh Belay, Wenzong Liu, Asamin Yesigat, Xiaodi Hao, Aijie Wang
ENVIRONMENTAL RESEARCH
(2020)
Article
Biotechnology & Applied Microbiology
Weiwei Cai, Wenzong Liu, Bo Wang, Hong Yao, Awoke Guadie, Aijie Wang
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2020)
Article
Environmental Sciences
Rui-Yun Ren, Li-Hui Yang, Jing-Long Han, Hao-Yi Cheng, Fidelis Odedishemi Ajibade, Awoke Guadie, Hong-Cheng Wang, Bin Liu, Ai-Jie Wang
ENVIRONMENTAL RESEARCH
(2020)
Article
Environmental Sciences
De-Chun Xu, Si-Yuan Zhai, Hao-Yi Cheng, Awoke Guadie, Hong-Cheng Wang, Jing-Long Han, Cheng-Yan Liu, Ai-Jie Wang
ENVIRONMENTAL RESEARCH
(2020)
Article
Agricultural Engineering
Fidelis Odedishemi Ajibade, Hong-Cheng Wang, Awoke Guadie, Temitope Fausat Ajibade, Ying-Ke Fang, Hafiz Muhammad Adeel Sharif, Wen-Zong Liu, Ai-Jie Wang
Summary: Biochar was used to enhance the removal of organic and nitrogen from secondary wastewater in constructed wetlands. Adding 1% biochar and microbes significantly increased the removal efficiencies of COD and nitrogen, while the release of dissolved organic carbon from biochar promoted nitrogen removal. RNA gene sequencing analysis showed enhanced growth of bacteria in biochar-amended systems.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Solomon Neway Jida, Jean-Francois Hetet, Pascal Chesse, Awoke Guadie
Summary: This study investigated the concentration of particulate matter from roadside vehicles in Addis Ababa, Ethiopia using artificial neural network models. The results showed that both PM2.5 and PM10 levels exceeded air quality standards, with the modeling techniques providing accurate predictions for transport-related particulate matter emissions. The findings suggest potential applicability for similar geographical and developmental settings in Ethiopia and other countries.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2021)
Article
Environmental Sciences
Awoke Guadie, Asamin Yesigat, Shetie Gatew, Abebe Worku, Wenzong Liu, Fidelis Odedishemi Ajibade, Aijie Wang
Summary: The study found that the aerobic-anoxic treatment enhanced water quality and was beneficial for soil. Vegetables irrigated with untreated wastewater had higher concentrations of heavy metals, posing potential risks to human health. The health indexes showed that lead and cadmium levels in wastewater-irrigated vegetables could lead to non-carcinogenic disease for adults and children.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Shu-Sen Wang, Hao-Yi Cheng, Hao Zhang, Shi-Gang Su, Yi-Lu Sun, Hong-Cheng Wang, Jing-Long Han, Ai-Jie Wang, Awoke Guadie
Summary: By comparing sulfur autotrophic denitrification (SAD) and heterotrophic denitrification (HD) filters under identical conditions, this study found that while the start-up time of SAD filter is longer, it outperforms HD filter in terms of performance and cost, showcasing potential application prospects.
ENVIRONMENTAL RESEARCH
(2021)
Article
Environmental Sciences
Awoke Guadie, Jing-Long Han, Wenzong Liu, Yang-Cheng Ding, Mengist Minale, Fidelis O. Ajibade, Siyuan Zhai, Hong-Cheng Wang, Haoyi Cheng, Nanqi Ren, Aijie Wang
Summary: The combination of Fenton pretreatment with different biological processes effectively enhances the removal efficiency of pyridine. The hydroxyl radicals generated during the Fenton oxidation process promote hydroxylation and mineralization of pyridine, resulting in significantly improved removal efficiencies. Dominant phyla and genera in the biological treatment conditions play crucial roles in the biotransformation of pyridine and its intermediate products.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Engineering, Environmental
Yangcheng Ding, Bin Liang, Wenli Jiang, Jinglong Han, Awoke Guadie, Hui Yun, Haoyi Cheng, Renjun Yang, Shuang-Jiang Liu, Aijie Wang, Nanqi Ren
Summary: UV photolysis as a pretreatment method effectively eliminates antibacterial activity in synthetic wastewater, reducing the diversity and abundance of antibiotic resistance genes in subsequent bioreactors. The method also shapes the structure and composition of sludge microbial communities closer to those without FLO, reducing the relative abundances of potential hosts of ARGs. Additionally, UV photolysis decreases the horizontal transfer of the floR gene, providing new insights into source control of antibiotic resistome in biological treatment processes.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Mengist Minale, Awoke Guadie, Yuan Li, Yuan Meng, Xuejiang Wang, Jianfu Zhao
Summary: This study utilized manganese dioxide loaded poly(sodium acrylate) hydrogel to effectively remove oxytetracycline antibiotics from aqueous environments, attributing the outstanding performance to the synergistic effects of adsorption and oxidative degradation.
Review
Environmental Sciences
Asamin Yesigat, Abebe Worku, Addisu Mekonnen, Wookeun Bae, Gudina Legese Feyisa, Shetie Gatew, Jing-Long Han, Wenzong Liu, Aijie Wang, Awoke Guadie
Summary: Currently, there is a need to shift towards resource recycling and reuse due to the depletion of natural resources and contamination of the surrounding environment. Phosphorus (P) is a model nutrient that is facing depletion and causing environmental degradation, prompting the search for solutions. One viable option is the recovery of P as struvite from wastewater, with K-struvite being a promising approach. However, there is a lack of information regarding the crystallization of K-struvite. This study provides insights into the recovery of K-struvite from wastewater as a slow-release fertilizer.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Samson Tizazu, Getaneh Tesfaye, Berhanu Andualem, Aijie Wang, Awoke Guadie
Summary: In this study, the potential of Rift Valley halotolerant and thermo-alkaliphilic microbial consortia for azo dye biodegradation in textile wastewater was evaluated. The microbial consortia showed high efficiency in color and COD removal under anaerobic and aerobic conditions, and could decolorize various types of dyes. The dominant phyla in the consortia were Bacteroidetes, Proteobacteria, Chloroflexi, and Halobacterota.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Biodiversity Conservation
Addisu Mekonnen, Peter J. Fashing, Colin A. Chapman, Ejigu Alemayehu Worku, Belste Fetene, Mekbib Fekadu, Awoke Guadie, Nils Chr Stenseth, Vivek V. Venkataraman
Summary: The Ethiopian wolf is considered both a flagship and an umbrella species for the restoration of Afroalpine habitat and conservation of sympatric species. Protecting and restoring Afroalpine habitat has the potential to contribute to achieving multiple UN Sustainable Development Goals.
ENVIRONMENTAL CONSERVATION
(2023)