Article
Chemistry, Physical
Camila Magalhaes de Sousa, Vicelma Luiz Cardoso, Fabiana Regina Xavier Batista
Summary: The increasing development of industries has led to excessive exploitation of natural resources and unregulated discharge of wastewater into the environment. Heavy metals, such as chromium, are highly toxic and persistent in nature. This study investigates the synergistic photocatalytic process for the reduction and removal of Cr (VI), using niobium oxide (Nb2O5) and microalgae Chlamydomonas reinhardtii in separate phases. The results show that the proposed model provides an average total removal of 71%, 31%, and 18% for initial concentrations of 10, 30, and 50 mg/L of Cr (VI), respectively.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Environmental Sciences
Beatriz Caliman Soares, Thais Eduarda Abilio, Julia Cristina Jose, Georgia Labuto, Elma Neide Vasconcelos Martins Carrilho
Summary: Biosorption is an effective and environmentally friendly method for removing pollutants and commercial metals. In this study, lettuce root and nanomodified lettuce root were used to adsorb hexavalent chromium from water, and various parameters such as pH and kinetics were evaluated. The results showed that nanomodified lettuce root had good adsorption capacity and could be used as a feasible biosorbent for removing hexavalent chromium from the medium.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Sajad-Ur-Rehman Beig, Shakeel Ahmad Shah
Summary: This study reports the use of waste fungal biomass for the detoxification and removal of chromium ions. The treated waste fungal biomass showed a high remediation effectiveness of 99.66% for chromium ions under optimal conditions. The generated waste fungal biomass adsorbent also exhibited significant recycling potential.
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
(2023)
Editorial Material
Environmental Sciences
Hanui Yang, Namgyu Kim, Donghee Park
Summary: Review papers are important for researchers to align their research and for beginners to quickly gain relevant knowledge. This particular review paper by Othmani et al. (2022) focuses on the adsorptive removal of three harmful pollutants using agricultural waste materials. However, the section related to Cr(VI) removal lacks important information regarding the redox reaction mechanism involved. It is crucial to interpret the factors affecting Cr(VI) removal in terms of the redox reaction concept rather than simple anion adsorption.
ENVIRONMENTAL RESEARCH
(2023)
Article
Multidisciplinary Sciences
Hala M. Hamadeen, Elsayed A. Elkhatib, Mohamed L. Moharem
Summary: In this study, an inexpensive and eco-friendly nano-adsorbent was produced from the waste of drinking water industry for effective elimination of Cr(VI) from wastewater. The nWTRs adsorbent exhibits very rapid adsorption potential for Cr(VI) within the first 15 min, and the estimated maximum sorption capacity of nWTRs was found to be higher than that of bulk adsorbents. The study also shows that nWTRs have high immobilization capability for sorbed Cr(VI) and can efficiently remove Cr(VI) from wastewater using batch and column techniques.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Bharti Verma, Chandrajit Balomajumder
Summary: This study focused on reducing hexavalent chromium to trivalent chromium using hydrazine, with an evaluation of reduction kinetics under different process parameters. The experiments showed that at 50 degrees C and a Cr(VI) to N2H4 molar ratio of 1:5, a high reduction rate of 96.8% was achieved.
ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL
(2021)
Article
Engineering, Environmental
Qilin Zhai, Runqing Liu, Changtao Wang, Nianwen Jing, Feifei Xie, Xiaofei Wen, Wei Sun
Summary: This study improved the reduction ability of copper slag flotation tailings (CST) for Cr(VI) through reduction calcination, achieving 100% Cr(VI) remediation efficiency. Moreover, CST also showed excellent removal capacity for As(III), Pb(II), and Cd(II).
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Analytical
Hanui Yang, Namgyu Kim, Donghee Park
Summary: This study reports that inexpensive, abundant, and commercially available pine bark has the highest Cr(VI) removal capacity compared to biomass reported elsewhere, making it a promising candidate for the removal of Cr(VI) from wastewater.
Article
Multidisciplinary Sciences
Ouyang Jia, Qinghua Miao, Dong Wei, Xinxin Zhang, Erming Luo, Chunying Li, Li Wei
Summary: This study explores the potential of using the BESI(R) process for treating Chromium (Cr)-containing Printed Circuit Board (PCB) wastewater. The process utilizes sulfur metabolism to achieve sulfate reduction and sulfide oxidation, leading to efficient removal of Cr. The study also reveals the impact of Cr(VI) stress on the microbial community, as well as the precipitation components involved in Cr removal from the wastewater.
Article
Polymer Science
Ambreen Ashar, Ijaz Ahmad Bhatti, Asim Jilani, Muhammad Mohsin, Sadia Rasul, Javed Iqbal, Muhammad Bilal Shakoor, Abdullah G. Al-Sehemi, S. Wageh, Ahmed A. Al-Ghamdi
Summary: The study focused on the solar photocatalytic reduction of highly toxic Cr(VI) to innocuous Cr(III) using the efficient and economically feasible ZnO/CuO nanocomposite grafted onto polyester fabric. Characterization techniques confirmed the successful grafting of solar active nanoflakes onto the fabric and the enhanced reduction of Cr(VI) metal from wastewater. The ZnO/CuO/PF demonstrated reusability and remarkable effectiveness in removing chromium from wastewater under natural sunlight.
Article
Chemistry, Physical
Zhongxuan Xu, Diandi Li, Yuping Tan, Qinyu Yang, Han Xiong, Jiguang Li, Hong Deng, Zhang Lin
Summary: Microbial treatment of heavy metals is a low-cost and environmentally friendly method. Different environmental media, as well as the coexistence of various metal cations, can impact the efficiency of bacteria in immobilizing chromium. The research found that the Mg(II) group has the highest chromium immobilizing rate, while Cd(II) has the strongest inhibitory effect on the reduction and immobilization of chromium.
SURFACES AND INTERFACES
(2021)
Article
Engineering, Environmental
Oputu Ogheneochuko, Ntshoko Zintle, Fester Veruscha
Summary: Sustainable waste management practices involve utilizing renewable resources for waste disposal. This study found that waste derived from pineapple can be used as a biosorbent for removing cobalt ions from water. Batch and column studies showed that modified pineapple waste exhibited good removal performance. Kinetic and equilibrium data were best described by the pseudo-second-order and Freundlich isotherm, respectively, while column data fitted well with the Yoon Nelson model. Thomas's model successfully described the behavior of the pineapple waste in removing cobalt ions from real wastewater.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Zeenat Arif, Naresh Kumar Sethy
Summary: This paper explores the innovative approach of using a green route synthesized cost-effective bi-functional material to eliminate toxic hexavalent chromium commonly found in tannery wastewater. By optimizing the process conditions, high rejection rate and photocatalytic reduction can be achieved.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Polymer Science
Hala Fakhry, Abeer A. Ghoniem, Fatimah O. Al-Otibi, Yosra A. Helmy, Mohammed S. El Hersh, Khaled M. Elattar, WesamEldin I. A. Saber, Ashraf Elsayed
Summary: Melanin, a natural polymer found in all living organisms, plays a key role in protecting the body from harmful UV rays. When compared as Cr(VI) biosorbents, fungal biomass and extracellular melanin were both effective, with melanin showing superior performance. Decision tree modeling offered improved efficiency in the Cr(VI) removal process compared to equilibrium isotherms and kinetic studies.
Article
Multidisciplinary Sciences
Ghada E. Dawwam, Nehad M. Abdelfattah, Mohamed O. Abdel-Monem, Hossam S. Jahin, Amal M. Omer, Khadiga A. Abou-Taleb, Eman S. Mansor
Summary: Heavy metals, including lead, have detrimental effects on human health and the environment. This study identified two efficient bacteria strains, 8EF and 17OS, for growing on media supplemented with Pb2+. The isolate 17OS showed remarkable resistance to multiheavy metals and was identified as Paenibacillus dendritiformis 17OS. Further optimization of Pb2+ removal by the tested bacteria using Design-Expert revealed significant variables affecting the removal process, and the strain was able to modulate these variables for maximum removal. Dead biomass of P. dendritiformis 17OS was then used to create a hydrophilic adsorptive membrane for easy separation of Pb2+ from aqueous solutions.
SCIENTIFIC REPORTS
(2023)
Article
Environmental Sciences
Yongliang Chen, Masud Hassan, Md Nuruzzaman, Huiming Zhang, Ravi Naidu, Yanju Liu, Ling Wang
Summary: Adsorption is a promising remediation technology for separating organic and inorganic agrochemicals from contaminated soil and water. This study focuses on the use of iron-modified base-activated biochar (FeBBC) as a low-cost adsorbent for removing the insecticide imidacloprid from water. The FeBBC exhibits high adsorption capacity and both physical and chemical interactions contribute to the sorption process. The results demonstrate the potential of FeBBC as an effective adsorbent for removing organic contaminants.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Xing Ma, Haixia Tian, Yunchao Dai, Yizhe Yang, Mallavarapu Megharaj, Wenxiang He
Summary: Antimony is a toxic metalloid that is widely present in the environment and poses a threat to human and ecological health. This study investigated the effect of Sb contamination on the kinetic parameters of soil arylsulfatase. The results showed that Sb inhibited the activity of soil arylsulfatase and affected its kinetic parameters.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Soil Science
Amanzhan Nurzhan, Haixia Tian, Bayan Nuralykyzy, Huayong Li, Xing Ma, Mallavarapu Megharaj, Wenxiang He
Summary: Soil phosphatase activity is sensitive to arsenic pollution and can be used to estimate arsenic toxicity in soil. This study investigated the effect of phosphorus addition on arsenic desorption and its toxicity to acid phosphatase. The results showed that phosphorus application increased arsenic desorption ratio and bioavailability in soil. Phosphorus addition significantly reduced soil acid phosphatase activity under all phosphorus concentrations but increased it in the soil with minimum arsenic content. The study also highlighted the importance of controlling phosphorus fertilizer applications in silty soils with acid and neutral pH to prevent increased arsenic mobility and toxicity to soil acid phosphatase.
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
(2023)
Article
Agronomy
Solmaz Bidast, Ahmad Golchin, Ahmad Baybordi, Amir Mohseni, Ravi Naidu
Summary: The potential of bare and carboxymethyl cellulose (CMC)-coated iron oxide nanoparticles (FeONPs) for stabilising lead (Pb), zinc (Zn), and cadmium (Cd) in contaminated soil was investigated. The results showed that CMC-coated FeONPs were more effective in decreasing the availability of potentially toxic elements in the soil. CMC-coated goethite was the most effective treatment for reducing Zn and Cd availability, while CMC-coated magnetite was the most effective for Pb stabilisation.
ARCHIVES OF AGRONOMY AND SOIL SCIENCE
(2023)
Article
Environmental Sciences
M. A. A. Wijayawardena, K. Yan, Y. Liu, R. Naidu
Summary: Mouse models have been commonly used to predict the bioavailability of metals and chemicals in humans. In this study, the effectiveness of mouse models in predicting the bioavailability of lead in metal mixtures was confirmed, while their ability to predict the bioavailability of arsenic was found to be limited.
Article
Environmental Sciences
Sara Ghavamifar, Ravi Naidu, Vahid Mozafari, Zhaohui Li
Summary: In this study, two sorbents, calcite and saponite, were used to investigate their capacity to sorb glyphosate. It was found that the morphology of calcite transformed and the zeta potential became positive in alkaline pH, contradicting previous research. The modified sorbents were added to soil samples to study their effects on glyphosate sorption.
Article
Environmental Sciences
Yunlong Luo, Ravi Naidu, Cheng Fang
Summary: This study investigates the surface functional group changes and release of microplastics and nanoplastics during the combustion process of an outdoor plastic chair. Scanning electron microscopy (SEM) and Raman imaging techniques are used to characterize the fragments created when the plastic is burned and deposited on solid surfaces. Different algorithms, including logic-based, non-supervised PCA-based, algebra-based, and hybrid algorithms, are tested and optimized to extract key information for plastics characterization, particularly in distinguishing different degrees of burning. The findings estimate that tens of microplastics and nanoplastics are created per square micron during the combustion process.
ENVIRONMENTAL POLLUTION
(2023)
Article
Chemistry, Analytical
Md. Rashidul Islam, Peter Sanderson, Mathew P. Johansen, Timothy E. Payne, Ravi Naidu
Summary: This study evaluated the environmental behavior of beryllium in soil-water systems under different sorption conditions, and found that certain ions and factors such as temperature and concentration can affect the sorption and desorption of beryllium.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2023)
Article
Environmental Sciences
Al Amin, Yunlong Luo, Annette Nolan, Megharaj Mallavarapu, Ravi Naidu, Cheng Fang
Summary: This study investigates the degradation and conversion of PFAS in contaminated soil during the firefighting process by exposing the soil sample to high temperatures. The research finds that PFAS precursors, non-C-F bonded PFAS, PFCA, and PFSA can all be degraded under high temperature conditions. A 2D Gaussian surface is used to fit the concentration dependence of PFAS on temperature and time, providing a visual representation of the complex thermal kinetic process. This study offers a simple approach for monitoring and optimizing the thermal treatment of PFAS-contaminated soil.
Article
Environmental Sciences
Yantao Li, Rahat Shabir, Mehran Rezaei Rashti, Mallavarapu Megharaj, Chengrong Chen
Summary: This research explored the potential of four cow manure compost (CMC)-based products as a rhizobial carrier. The product with 50% gypsum showed better physicochemical characteristics and the highest strain survival rate in soil. This study demonstrated the great potential of CMC-based commercial products as alternative carrier materials for rapid commercial development of inoculants.
LAND DEGRADATION & DEVELOPMENT
(2023)
Article
Environmental Sciences
Yan Li, Ziquan Wang, Haixia Tian, Mallavarapu Megharaj, Hanzhong Jia, Wenxiang He
Summary: This study investigated the effects of two typical lower-ring polycyclic aromatic hydrocarbons (PAHs), naphthalene (Nap) and anthracene (Ant), on the activity and kinetic characteristics of FDA hydrolases in six soils. The results showed that both Nap and Ant significantly inhibited the activity of FDA hydrolase, and the inhibition was influenced by soil organic matter.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Biotechnology & Applied Microbiology
A. M. K. C. B. Aththanayake, I. V. N. Rathnayake, M. P. Deeyamulla, Mallavarapu Megharaj
Summary: Deterioration of ecosystem quality caused by toxic metals, especially hexavalent chromium, is a global issue. In this study, a bacterium called Staphylococcus edaphicus KCB02A11 showed high efficiency in removing hexavalent chromium from water within 96 hours and a wide range of concentrations (0.025-8.5 mg/L). By incorporating the isolated strain with natural substrates like hay and wood husk, 100% removal of hexavalent chromium (at 8.5 mg/L) was achieved in less than 72 hours, indicating its potential for large-scale metal removal. This study provides the first report on hexavalent chromium tolerance and removal by Staphylococcus edaphicus KCB02A11.
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
(2023)
Article
Environmental Sciences
Samarasinghe Vidane Arachchige Chamila Samarasinghe, Kannan Krishnan, Robert John Aitken, Ravi Naidu, Mallavarapu Megharaj
Summary: This study reveals the sub-chronic and generational effects of TiO2 nanoparticles on earthworms. The sub-chronic exposure did not cause notable adverse effects on parent earthworms, but the F1 generation displayed remarkable growth and maturity retardation, even at lower concentrations of nano-TiO2. The study emphasizes the potential induction of toxic effects by TiO2 nanoparticles and the urgent need for comprehensive evaluations of their longer-term toxicity.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Kartik Dhar, Sudharsanam Abinandan, Tanmoy Sana, Kadiyala Venkateswarlu, Mallavarapu Megharaj
Summary: Our study examined the anaerobic microbial degradation of hazardous polycyclic aromatic hydrocarbons (PAHs) and found that sulfate-reducing bacteria (SRB) in contaminated freshwater sediments can effectively degrade three-ringed phenanthrene and highly recalcitrant four-ringed pyrene. Desulfovibrio was the dominant bacterium in the phenanthrene-degrading culture, while Rhodopseudomonas was a significant member in the pyrene-degrading culture. This research indicates that SRB could play a crucial role in the natural attenuation of PAHs in oxygen-depleted freshwater sediments.
ENVIRONMENTAL RESEARCH
(2023)
Review
Engineering, Environmental
Balasubramanian Ramakrishnan, Naga Raju Maddela, Kadiyala Venkateswarlu, Mallavarapu Megharaj
Summary: Microalgae, as integral members of the soil microbial community, have the potential to modify soil conditions and interact with other organisms, but their agronomic benefits and ecological functions in agriculture still require further research and application.
ENVIRONMENTAL SCIENCE-ADVANCES
(2023)
Article
Engineering, Environmental
Xingxing Hu, Lingjie Liu, Yanmeng Bi, Lu Li, Chunsheng Qiu, Jingjie Yu, Shaopo Wang
Summary: In this study, the impact of exogenous folate on the start-up process of single-stage partial nitritation-anammox (SPNA) was evaluated using two lab-scale reactors. The results showed that folate addition can enhance nitrogen removal rate, extracellular polymeric substances production, hydrazine oxidase and dehydrogenase activity, as well as the relative abundance of Candidatus Brocadia.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Shaocang He, Tingting Shen, Jing Sun, Haoqi Pan, Chenxu Sun, Tianpeng Li, Runyao Li, Enshan Zhang
Summary: A novel process of acid leaching neutralization was developed for the preparation of inorganic polymeric composite ferric aluminum silicate coagulant (CFAS) using solid waste coal gasification coarse slag (CGCS). The optimized preparation process was determined through single-factor experiment and the performance of CFAS was evaluated for domestic sewage treatment. The results showed that CFAS exhibited excellent coagulation ability and achieved significant removal efficiency for turbidity, ammonia nitrogen, and chemical oxygen demand.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Kinga Szatmari, Sandor Nemeth, Alex Kummer
Summary: In this article, a resilience-based reinforcement learning approach is proposed to address the potential thermal runaway issue in batch reactors. By calculating the resilience metric for reactors and utilizing Deep Q-learning to decide when to intervene in the system, resilient-based mitigation systems can be effectively developed.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Bingyou Jiang, Qi Yao, Mingqing Su, Jingjing Li, Kunlun Lu, Dawei Ding, Han Hong
Summary: This study investigates the inhibitory characteristics and mechanisms of ABC powder on coal powder explosion. The addition of ABC powder significantly decreases the maximum explosion pressure and can completely suppress coal dust explosions. The study also reveals the thermal decomposition characteristics and reaction kinetics of the mixed system.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Kubilay Bayramoglu, Mustafa Nuran
Summary: This study examines the feasibility of using pyrolytic oil from waste tires as fuel in diesel engines, and evaluates its energy, exergy, and sustainability. The results indicate that pyrolytic oil has potential as a renewable fuel source with relatively high thermal efficiency.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Xinru Duan, Yejia Lv, Jiaxing Hong, Jianzhong Wu, Jia Zhang, Yang Yue, Guangren Qian
Summary: This study successfully prepared a tube reactor with optimized catalyst formula, which showed good performance in removing dioxins and other pollutants in the experiments.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Jiaoyang Du, Xueming Dang, Xiaorong Gan, Xin Cui, Huimin Zhao
Summary: In this study, a photocatalyst-enzyme hybrid system was constructed, which solved the issue of enzyme inactivation caused by high concentration of H2O2 through photocatalytic in-situ H2O2 production, and improved the stability and catalytic efficiency of the enzyme. The effectiveness of the system in treating phenolic EDCs was confirmed through experiments.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Fu-Rong Xiu, Longsheng Zhan, Yingying Qi, Xinyue Lei, Jiali Wang, Haipeng Zhou, Wenting Shao
Summary: This study developed a synergetic and high-efficiency treatment of waste tantalum capacitors (WTCs) and polyvinyl chloride (PVC) using subcritical water process. The treatment significantly reduced the temperature and reaction time for metal tantalum recovery from WTCs, and improved the dechlorination efficiency of PVC. The optimized conditions resulted in 100% resin conversion efficiency of WTCs and 97.39% dechlorination efficiency of PVC. The interaction between decomposition products of WTCs and PVC produced a high level of benzoic acid.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Bingda Li, Jiaming Song, Yuting Li, Chaoying Meng, Shuxian Wang, Linghao Zong, Honggang Ye, Yishuai Jing, Feng Teng, Peng Hu, Haibo Fan, Guangde Chen, Xin Zhao
Summary: CdPS3 nanosheets, especially those exfoliated by sodium cholate, have shown highly efficient photocatalytic degradation performance. The strong dark adsorption and dye-sensitized photocatalytic properties of CdPS3 nanosheets contribute to high degradation efficiencies of various pollutants.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Dongxu Ouyang, Yimei Pang, Bo Liu, Zhirong Wang
Summary: This study investigates the thermal runaway features of lithium-ion cells under tunnel conditions, considering different states of charge and tunnel ceilings. The results show that the tunnel visibility is affected by the smoke generated during thermal runaway, and the shape of the tunnel ceiling influences the temperature rise differently.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
