Case Studies in Chemical and Environmental Engineering最新文献

{"title":"Solvothermal synthesis of α-MnO2 and Mn2O3 for efficient catalytic dye degradation","authors":"Prasetya Prasetya ,&nbsp;Amir Awaluddin ,&nbsp;Muhdarina Muhdarina ,&nbsp;Edy Saputra ,&nbsp;Amilia Linggawati ,&nbsp;Nurhayati Nurhayati ,&nbsp;Ahmad Fudholi","doi":"10.1016/j.cscee.2025.101242","DOIUrl":"10.1016/j.cscee.2025.101242","url":null,"abstract":"<div><div>The increasing industrial demand for synthetic dyes, particularly in textiles as well as pulp and paper sectors, is a significant factor that intensified environmental pollution due to dye-contaminated wastewater. Therefore, this study aimed to develop efficient manganese oxide-based catalysts for methylene blue (MB) degradation through a one-step solvothermal synthesis route. Phase evolution of the synthesized MnO₂ materials was primarily governed by heating temperature and duration, rather than pH adjustment. Samples A-8 and A-9 of Mn₂O₃ were synthesized at 140 °C for 24 h, while A-10 and A-11 of α-MnO₂ were synthesized at 105 °C for 6 h. The results of morphological analysis showed that A-8 had rod-like structures, while A-9 contained a hierarchical architecture comprising rods and cubes. Acid-treated samples (A-8 and A-11) had higher crystallinity than A-9 and A-10 synthesized under alkaline conditions. The catalytic performance in MB degradation correlated with the presence of Mn³⁺/Mn²⁺ redox pairs and oxygen vacancies, where A-9 presented superior stability across a broad pH range of 1–11. Furthermore, acidic conditions significantly enhanced degradation efficiency compared to systems applying H₂O₂. Fragmentation of MB into simpler molecules confirmed the proposed degradation mechanism. The best performance was achieved using A-9 under 200 mg L^-1 MB, pH 1, 0.007 g L^-1 catalyst, and 30 min reaction time, signifying the potential for practical dye wastewater treatment applications.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"12 ","pages":"Article 101242"},"PeriodicalIF":0.0,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photochemical synthesis of CdS semiconductor by gas condensate as sulfur source, and evaluation of its photocatalytic property in the degradation of methylene blue dye as a case study","authors":"Amir Azizi ,&nbsp;Kaveh Khosravi ,&nbsp;Pouria Alaei Roozbahani ,&nbsp;Zohreh Farahani","doi":"10.1016/j.cscee.2025.101241","DOIUrl":"10.1016/j.cscee.2025.101241","url":null,"abstract":"<div><div>This study investigated a photochemical synthesis route for CdS particles, utilizing gas condensate extracted from oil wells as a sulfur source due to its high sulfur compound content. To confirm the synthesis and characterize the CdS, common techniques were employed. The photocatalytic performance of the synthesized particles was evaluated in the degradation of methylene blue dye under various conditions. Under optimized conditions the degradation efficiency of dye reached 96 % ± 0.5. This study presents a novel photochemical method for synthesizing CdS and highlights the potential application of its in environmental remediation. The process offers an effective approach for removing sulfur from fuels.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"12 ","pages":"Article 101241"},"PeriodicalIF":0.0,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144125189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electricity generation from co-pyrolysis gas of fresh palm fruit bunches and medical waste plastic bottles for sustainable energy applications","authors":"Songkran Wiriyasart ,&nbsp;Nathawat Unsomsri ,&nbsp;Pichai Asadamongkon ,&nbsp;Sittinun Tawkaew ,&nbsp;Surachai Narrat Jansri ,&nbsp;Sommas Kaewluan","doi":"10.1016/j.cscee.2025.101240","DOIUrl":"10.1016/j.cscee.2025.101240","url":null,"abstract":"<div><div>Co-pyrolysis gas produced from the co-pyrolysis of fresh palm fruit bunches and medical waste plastic bottles using a batch pyrolyzer integrated with a downdraft gasifier was evaluated for sustainable electricity generation. Increasing the plastic fraction enhanced the gas heating value (41.43–55.53 MJ/Nm³) but decreased gas yield from 22.7 % to 9.0 %. Electrical efficiency was calculated based on the ratio of output power to syngas energy content, achieving 8.96–9.01 %. Engine tests showed a reduction in CO emissions (30,149–17,419 ppm) and comparable NO_x levels to gasoline combustion. These results demonstrate the co-pyrolysis gas's potential as a renewable fuel for decentralized power.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"12 ","pages":"Article 101240"},"PeriodicalIF":0.0,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144125188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of airflow and N/P ratio on CO2 removal by chlorella vulgaris: A study with real-time monitoring using low-cost sensors","authors":"Diego Miguel Gutierrez Rodriguez ,&nbsp;María Albertina Alvarado Orbegoso ,&nbsp;Claudio Eduardo Quiñones Cerna ,&nbsp;Yrwin Francisco Azabache Liza ,&nbsp;Ronald Fernando Rodriguez Espinoza ,&nbsp;Heber Max Robles Castillo ,&nbsp;Adolfo Enrique Guerrero Escobedo","doi":"10.1016/j.cscee.2025.101239","DOIUrl":"10.1016/j.cscee.2025.101239","url":null,"abstract":"<div><div>Climate change represents one of the greatest challenges we face globally, and reducing carbon dioxide (CO₂) emissions is among the most urgent actions. In this study, we explored an alternative approach using microalgae (<em>Chlorella vulgaris</em>) to capture CO₂ from the air, employing an Arduino-controlled biofiltration system with accessible sensors such as the MQ-135 and TESTO 535. We tested different airflow rates (50, 75, and 100 L per hour) and nutrient combinations (N/P ratios of 0, 108.33, and 216.67) to identify the most efficient conditions. Unlike other studies, we integrated real-time monitoring of variables such as CO₂ concentration, temperature, and light within a modular, easily adaptable system. The best results were achieved with a flow rate of 100 L/h and an N/P ratio of 216.67, yielding a capture efficiency of 34.88 % and a daily productivity of nearly to 1 g/L. This proposal demonstrates that it is possible to develop effective, economical, and replicable solutions that combine accessible technology and biotechnology to help mitigate climate change.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"12 ","pages":"Article 101239"},"PeriodicalIF":0.0,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Significant role of anionic behavior of cocoyl glutamate on lead(II) ion adsorption towards activated carbon adsorbent from cigarette butts","authors":"Moh Zeinur Ridho ,&nbsp;Retno Pertiwi ,&nbsp;Eldo Delta Bagaskara ,&nbsp;Raya Rambu Rambani ,&nbsp;Chika Synthia Pitaloka ,&nbsp;Fanta Mei Wahyuni ,&nbsp;Istiqomah Rahmawati ,&nbsp;Muhammad Reza","doi":"10.1016/j.cscee.2025.101140","DOIUrl":"10.1016/j.cscee.2025.101140","url":null,"abstract":"<div><div>Cigarette butts are one of the most abundant waste in the world, being dangerous due to non-biodegradable behavior and highly toxic. Cigarette butts can be converted to activated carbon (CA) which can be used as an adsorbent. However, the synthesized CA lacks functional groups facilitating the interaction with adsorbate, like heavy metal. This paper investigates the effect of Disodium Cocoyl Glutamate (DCG) modification on CA towards lead(II) ion adsorptions. CA was synthesized from cigarette butt waste through several vital processes, like flash carbonization and activation. The surfactant used in this study was DCG due to its natural and anionic behavior, with varied concentrations (0.1, 1, and 10 % (v/v)). Infrared spectroscopy revealed that the structure of both CA and CA-DCG mainly consists of aromatic rings functionalized by several oxygen functional groups, such as carbonyl and hydroxyl groups. Adding DCG increases the number of carbonyl groups in the CA confirmed by infrared and elemental analysis data. The obtained CA-DCGs have an amorphous property and a slightly porous structure. The presence of DCG also affects CA-DCG crystallinity, which increases the amorphous content as the concentration of DCG increases. The adsorption results show that the equilibrium removal efficiency significantly increased from 25 % to 99 % as DCG was introduced to the CA. CA-DCG 0.1 % demonstrated the highest maximum adsorption capacity of 9.89 mg/g. The presence of DCG markedly enhances the affinity of CA towards lead(II) ions due to its anionic behavior. Based on these results, CA-DCG is potentially applied as a lead(II) ion adsorbent. It also could reduce the existing cigarette butt waste in the environment.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"11 ","pages":"Article 101140"},"PeriodicalIF":0.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144155005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Toxicity of insecticide quinalphos-based Kinalux 25EC on fingerling climbing perch (Anabas testudineus): Brain cholinesterase and growth inhibitions","authors":"Nguyen Van Cong ,&nbsp;Tran Hoang Kha ,&nbsp;Bui Thi Bich Hang ,&nbsp;Duong Tri Dung ,&nbsp;Tran Sy Nam","doi":"10.1016/j.cscee.2025.101136","DOIUrl":"10.1016/j.cscee.2025.101136","url":null,"abstract":"<div><div>This study aims to determine median lethal concentration (LC50) and effects at sublethal levels of quinalphos on brain cholinesterase (ChE) and growth of fingerlings climbing perch (<em>Anabas testudineus</em>). Results showed that LC₅₀-96 h was 1.88 mg L⁻¹. Brain ChE activity was significantly inhibited at concentration of 10 % LC₅₀-96h or higher up to the end 96 h of exposure. In the growth experiment, specific growth rate was inhibited 48.0 % and 34.8 % at treatment 10 % and 20 % LC50-96h, respectively while feed conversion ratio elevated to 164.5 % control at treatment 10 % and to 132.3 % at treatment 20 % LC50-96h. Survival rates were 86 % at 10 % LC50-96h and 34.7 % at 20 % LC50-96h. The study indicated that quinalphos is highly toxic for the climbing perch leading to potential health risk for this species living in rice fields of the Lower Mekong Delta. Monitoring and controlling quinalphos levels in aquatic environments are important acts to mitigating its adverse impacts on aquatic organisms. Promoting the use of less toxic or biodegradable pesticides is urgently needed.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"11 ","pages":"Article 101136"},"PeriodicalIF":0.0,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143224183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eco-friendly alkali-activated nano concrete: Impact of nano-GGBFS on mechanical and microstructural properties","authors":"Samuvel Raj R ,&nbsp;G. Prince Arulraj ,&nbsp;N. Anand ,&nbsp;Balamurali Kanagaraj ,&nbsp;Eva Lubloy","doi":"10.1016/j.cscee.2025.101131","DOIUrl":"10.1016/j.cscee.2025.101131","url":null,"abstract":"<div><div>The production of Ordinary Portland Cement (OPC) is a significant contributor to greenhouse gas emissions, particularly carbon dioxide (CO₂), which impacts the environment. To address this issue, the construction industry is focusing on reducing CO₂ emissions while improving the strength and microstructure of concrete through the use of nanomaterials (NM). This study investigates the fresh, mechanical, and microstructural properties of Fly Ash (FA) and Ground Granulated Blast Furnace Slag (GGBFS)-based Alkali-Activated Nano Concrete (AANC) with nano Ground granulated blast furnace Slag (nGS). The results show that varying concentrations of nGS enhanced the properties of AANC, with 12 % nGS yielding the best mechanical and microstructural performance. Microstructural studies, including Field Emission Scanning Electron Microscopy (FESEM), X-ray Diffraction (XRD), Energy Dispersive X-ray analysis (EDAX), Fourier Transform Infrared (FTIR), and Thermogravimetric Analysis (TGA), demonstrated superior geopolymerization at this optimal nGS content. The addition of nGS also reduced the setting time and increased compressive strength, leading to a denser, crack-free matrix. However, excessive nGS beyond the optimal content resulted in non-uniform distribution due to agglomeration. The findings suggest that incorporating nGS in AANC can significantly improve the performance and sustainability of construction materials. The economic analysis and Life Cycle Assessment (LCA) results collectively demonstrate the viability of nGS-enhanced AANC as a sustainable solution, offering long-term cost savings through reduced maintenance, extended service life, and energy efficiency, while significantly lowering environmental impacts across its lifecycle stages, positioning it as a high-performance and environmentally friendly alternative to traditional Portland cement-based materials.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"11 ","pages":"Article 101131"},"PeriodicalIF":0.0,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Utilization of local coal in Pakistan's oil-fired power plants and future clean technologies for power generation","authors":"Qamar Abbas ,&nbsp;Haseeb Yaqoob ,&nbsp;Uzair Sajjad ,&nbsp;Hafiz Muhammad Ali ,&nbsp;Muhammad Musaddiq Jamil","doi":"10.1016/j.cscee.2025.101132","DOIUrl":"10.1016/j.cscee.2025.101132","url":null,"abstract":"<div><div>Pakistan possesses extensive lignite coal reserves that remain underutilized due to their low quality and reliance on imported oil for power generation. This study examines the feasibility of using local coal to replace oil in power plants while meeting global and local emission standards. The research explores clean coal technologies like Underground Coal Gasification (UCG) combined with Integrated Gasification Combined Cycle (IGCC) and carbon capture systems to mitigate environmental impact. Economic, environmental, and technical comparisons with renewables highlight UCG-IGCC as a cost-effective, sustainable solution for Pakistan's energy challenges, offering pathways to reduced emissions and greater energy self-sufficiency.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"11 ","pages":"Article 101132"},"PeriodicalIF":0.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144155001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kinetics and mechanisms of 4-chloroguaiacol removal by adsorption onto a novel amorphous carbon thin film synthesized from Hamelia patens leaves","authors":"Zaharaddeen N. Garba ,&nbsp;Chavalit Ratanatamskul","doi":"10.1016/j.cscee.2025.101137","DOIUrl":"10.1016/j.cscee.2025.101137","url":null,"abstract":"<div><div>This work developed <em>Hamelia patens</em> Jacq leaves (an agricultural waste) as a novel amorphous carbon thin-film (HPL-ACTF) adsorbent, which was successfully employed in removal of 4-chloroguaiacol (4CG) from wastewater. Central composite design was used to optimize batch adsorption performance with the optimal conditions of 139 mg of adsorbent, 285 mg/L of 4CG concentration, and 195 min of adsorption time. The predicted and obtained 4CG removal efficiencies were 97.11 and 98.06 %, respectively. Langmuir isotherm could fit the equilibrium adsorption-data with the maximum adsorption capacity of 276.88 mg/g. Moreover, HPL-ACTF is cost-effective since it could be regenerated up to five times.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"11 ","pages":"Article 101137"},"PeriodicalIF":0.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144155000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PFAS Contamination and Mitigation: A Comprehensive Analysis of Research Trends and Global Contributions","authors":"Motasem Y.D. Alazaiza ,&nbsp;Tharaa M. Alzghoul ,&nbsp;Madhusudhan Bangalore Ramu ,&nbsp;Salem S. Abu Amr ,&nbsp;Mohammed F.M. Abushammala","doi":"10.1016/j.cscee.2025.101127","DOIUrl":"10.1016/j.cscee.2025.101127","url":null,"abstract":"<div><h3>Per</h3><div>and polyfluoroalkyl substances (PFAS) are a group of synthetic chemicals known for their persistence in the environment and potential adverse effects on human health. This study conducted a bibliometric analysis of 581 publications from the Scopus database, covering the period from 2015 to November 2024, to assess research trends and developments related to PFAS. The findings reveal a significant increase in research output, with the number of published articles rising from just 7 in 2015 to 134 in 2024, indicating a growing global awareness of PFAS contamination. \"Environmental Science\" emerges as the leading discipline, accounting for 44.8% of total publications, followed by Chemistry at 15%. The United States is the foremost contributor, with 216 publications and 11,213 citations, followed by China and Sweden. Common PFAS compounds, particularly perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS), have been widely detected in various ecosystems, including surface water, groundwater, and soil. These substances pose significant risks to aquatic organisms and human health due to their persistence and potential for bioaccumulation. The analysis highlights effective treatment methods for PFAS removal, such as adsorption and photocatalysis, which are crucial for mitigating environmental contamination. Prominent journals like \"Science of the Total Environment\" and \"Environmental Science and Technology\" play vital roles in disseminating research findings, while the \"National Natural Science Foundation\" of China is identified as a key funding source supporting numerous studies. Overall, the research underscores the need for innovative strategies and integrated management plans to combat PFAS pollution effectively. It emphasizes the importance of interdisciplinary collaboration to enhance understanding of PFAS behavior in ecosystems and to develop effective remediation techniques, ultimately protecting water quality and public health from the multifaceted challenges posed by PFAS contamination.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"11 ","pages":"Article 101127"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}