Sustainable Chemistry for the Environment最新文献

{"title":"Cellulose: A comprehensive review of its properties and applications","authors":"Elina Marinho","doi":"10.1016/j.scenv.2025.100283","DOIUrl":"10.1016/j.scenv.2025.100283","url":null,"abstract":"<div><div>Cellulose is a complex carbohydrate and a fundamental structural element in plant cell walls, consisting of long chains of glucose molecules that form a rigid framework providing strength and support to plants. As the most prevalent natural polymer, cellulose is an ideal candidate for producing environmentally friendly and economically viable polymeric products, traditionally made from petroleum-based synthetic polymers. It is the most abundant renewable material in the biosphere, cost-effective, non-toxic, and biodegradable. Cellulose’s physical and chemical properties – such as its insolubility in water, semi-crystalline structure, high tensile strength, biodegradability, and chemical reactivity – make it an incredibly versatile material. Recent studies have demonstrated its promising applications in various industries, including biofuels, bioplastics, and eco-conscious packaging. Specifically, cellulose acetate has emerged as a widely used derivative due to its biodegradable nature and versatility in applications like 3D printing, medical supplies, and environmentally friendly packaging. However, challenges related to extraction costs, property variability, and competition with synthetic materials still exist. Future research will aim to overcome these barriers by enhancing the properties of cellulose, improving processing technologies, and exploring nanocellulose and genetically modified plants as key areas for innovation. Innovations in cellulose recycling and the use of agricultural waste for biofuels are expected to further drive its integration into circular economy models, fostering environmental benefits and reducing overall impact.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"11 ","pages":"Article 100283"},"PeriodicalIF":0.0,"publicationDate":"2025-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144863786","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":"Green synthesis of silver nanoparticles using Azadirachta indica (Neem) fruit pulp extract and their antioxidant, antibacterial, and anticancer activity","authors":"Bangaru Babu Alampally ,&nbsp;Y Subba Rao ,&nbsp;Sravanthi Pidamarthi ,&nbsp;Sankara Rao Miditana ,&nbsp;Pulsingh Dhanavath ,&nbsp;Durga Bhavani A.K.","doi":"10.1016/j.scenv.2025.100282","DOIUrl":"10.1016/j.scenv.2025.100282","url":null,"abstract":"<div><div>In this research, silver nanoparticles (AgNPs) were synthesized using <em>Azadirachta indica</em> (Neem) fruit pulp extract as a natural reducing agent. The synthesized AgNPs were characterized by the TEM, AFM, XRD, DLS, FTIR, and UV–visible spectral analysis. Visual confirmation of AgNP synthesis was indicated by the appearance of a reddish-brown color, further supported by a UV–visible SPR band at approximately 453 nm. FTIR analysis supported the formation and stabilization of the nanoparticles, attributed to the phytochemicals present in the flower extract. The AgNPs were characterized by XRD analysis that confirmed the FCC crystalline nature of the AgNPs with an average crystalline size of 20.8 nm. EDX confirmed the presence of elemental silver. HRTEM images showed that the AgNPs are nearly spherical with an average size of 31.5 nm. The high negative potential value of AgNPs (−36.7 mV) was evident from DLS studies. AFM data revealed that the particles were agglomerated and spherical in shape, with less than 40 nm. The AgNPs also exhibited good antioxidant activities against DPPH radical with 66.72 % radical scavenging ability. The biosynthesized AgNPs demonstrated notable anticancer activity against burst cancer cell lines (77.28 µg/mL in the MTT assay) and demonstrated good antibacterial activities against gram-negative bacteria and gram-positive bacteria with a Zone of inhibition ranging from 8 to 16 mm. This study demonstrates the synthesis of AgNPs and their promising in biomedical applications, and the benefits of using plant extracts to prepare green nanoparticles.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"11 ","pages":"Article 100282"},"PeriodicalIF":0.0,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144863785","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":"Novel bifunctional thio-methylene-pyridine grafted polymeric resin for mercury removal from acidic solutions","authors":"Nikhilesh Iyer ,&nbsp;Ritesh Ruhela ,&nbsp;Suvarna Saundarajan ,&nbsp;Sanjukta Abhay Kumar ,&nbsp;Dhruva Kumar Singh","doi":"10.1016/j.scenv.2025.100280","DOIUrl":"10.1016/j.scenv.2025.100280","url":null,"abstract":"<div><div>This work brings forth a novel porous solid sorbent, thio-methylene-pyridine (TMP) ligand grafted polymeric resin (TMP resin), for selective mercury removal over a wide range of acidity in which the bi-functional group catered to sorption of both cationic and anionic species of Hg^2 + in aqueous hydrochloric acid medium. TMP resin showed quantitative sorption of ‘Hg²⁺’ in high as well as low acidic solutions (chloride medium) with uptake capacity in the range of 70–80 mg Hg/g, indicating sorption of ‘Hg²⁺’ in both cationic and anionic form as (HgCl₄)^2-, hence utilizing the bi-functionality of TMP ligand. Spectroscopic investigation on metal-ligand interactions, as well as DFT calculations indicated towards two separate mechanisms, one being preference for soft-soft co-ordinate complexation at lower acidity and other being anion exchange of Hg-chloride complex by pyridinium group at higher acidity. Near complete back extraction of Hg²⁺ from the Hg-loaded sorbent was achieved using 0.1 M thiourea solution at 0.1 M HCl. Resin was regenerated upto 5 cycles of repeated loading and elution wherein there was no appreciable change in the performance with respect to Hg²⁺ sorption &amp; desorption.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"11 ","pages":"Article 100280"},"PeriodicalIF":0.0,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843014","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":"Utilizing basic oxygen furnace slag and fly ash to stabilize wet flue gas desulfurization gypsum for construction applications","authors":"Dumisane Mahlangu ,&nbsp;Keletso Mphahlele ,&nbsp;Nomcebo Mthombeni ,&nbsp;Bridjesh Pappula ,&nbsp;Seshibe Makgato","doi":"10.1016/j.scenv.2025.100278","DOIUrl":"10.1016/j.scenv.2025.100278","url":null,"abstract":"<div><div>Gypsum production in South Africa has surged due to the country’s dependence on coal-fired power plants, resulting in increased generation of fly ash (FA), wet flue gas desulfurization gypsum (WFGDG), and basic oxygen furnace slag (BOFS). This study proposes a sustainable solution for repurposing these industrial by-products into eco-friendly construction materials. A novel binder was developed by blending varying proportions of WFGDG, FA, and BOFS. In these composite blocks, up to 50 wt% of WFGDG was substituted with FA and BOFS. The blends were evaluated for compressive strength, durability, resistance to wet-dry cycles, and environmental impact. The optimum mix-containing 10 wt% FA and 40 wt% BOFS - achieved a compressive strength of 4.4 MPa after 90 days of ambient curing at 40 °C, exceeding the SANS 10145 requirement for Class III mortar. Compaction tests showed that increasing FA content reduced reactivity, with the best performance observed at the mentioned ratio. Microstructural analysis using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) revealed the development of new hydration products and confirmed crystallinity. Despite FA's pozzolanic potential, it does not self-activate due to the absence of alkalis and sulfates. Environmental compliance was verified through the Toxicity Characteristic Leaching Procedure (TCLP), meeting the safety criteria of SANS 227:2007 and ASTM C34–13. The study highlights the potential of these waste-derived composite bricks for load-bearing applications, offering an environmentally and economically sustainable alternative for the construction sector.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"11 ","pages":"Article 100278"},"PeriodicalIF":0.0,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144852581","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":"Aqueous-mediated synthesis of 2-amino-7-hydroxy-4-aryl-4H-chromene-3-carbonitrile derivatives using triethanolamine: An effective basic organocatalyst","authors":"Farzaneh Mohamadpour","doi":"10.1016/j.scenv.2025.100279","DOIUrl":"10.1016/j.scenv.2025.100279","url":null,"abstract":"<div><div>A sustainable method for the effective and simple synthesis of derivatives of 2-amino-7-hydroxy-4-aryl-4<em>H</em>-chromene-3-carbonitrile is developed. The process makes use of a domino Knoevenagel-Michael cyclocondensation reaction. The reaction occurs at reflux in an aqueous solution using triethanolamine, a cheap and effective basic organocatalyst. This process makes use of sustainable chemical principles. Reactions go more rapidly, yielding good to exceptional results. It does not separate mixtures using the chromatographic process. This is an easy and inexpensive way. Reaction times range from 40 to 65 min, with an average of 47.81 min, while yields range from 72 % to 93 %, with an average of 85.06 %. It's also important to note that a variety of functional groups that give or remove electrons may be used with this approach, and yet retain a fast reaction rate and good to exceptional yields. The results show that, given very basic and effective reaction conditions, this approach is a fruitful one-pot procedure. The nature of the substituents has no bearing on the reaction. Because it combines multiple steps into a one-pot, it is both convenient and expedient.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"11 ","pages":"Article 100279"},"PeriodicalIF":0.0,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144852639","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":"Synthesis, structure, and photocatalytic properties of a Cu(II) coordination polymer derived from a flexible tripodal linker","authors":"Samiksha ,&nbsp;Gunjan Rajput ,&nbsp;Bhavesh Parmar ,&nbsp;Abhishek Dadhania ,&nbsp;Vera Isaeva ,&nbsp;Ravinder Kumar ,&nbsp;Kamal Kumar Bisht","doi":"10.1016/j.scenv.2025.100277","DOIUrl":"10.1016/j.scenv.2025.100277","url":null,"abstract":"<div><div>A copper coordination polymer, {[Cu(TIB)₂(H₂O)₂].Cl₂(H₂O)₂}_n (<strong>CP1</strong>) involving a tripodal N-donor, 1,3,5-tris((1H-imidazol-1-yl)methyl)benzene (TIB) ligand has been synthesized by environmentally friendly methods and structurally characterized. <strong>CP1</strong> exists as a 1D coordination polymer in which the Cu(II) ions possess a distorted octahedral coordination environment provided by N atoms from the four TIB ligands constituting the square base and O atoms from two coordinated water molecules occupying the axial coordination sites. The packing and hydrogen bonding interaction of <strong>CP1</strong> revealed that the centrosymmetric metal-organic strands are involved in intermolecular hydrogen bonding in the formation of 3D network <em>via</em> O-H···N, O-H···Cl and π···π interactions. <strong>CP1</strong> also features a [(H₂O)₂Cl₂] cluster running down the <em>c-</em>axis, <em>i.e.</em>, parallel to the metal-organic strands, [Cu(TIB)₂(H₂O)₂]_n. <strong>CP1</strong> is characterized by single-crystal X-ray diffraction and other physico-chemical techniques. Photocatalytic activity of <strong>CP1</strong> for the decomposition of aqueous Aniline Blue (AB) in the presence of 1 M hydrogen peroxide under the LED illumination was examined and showed approximately 62 % dye degradation in 135 min.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"11 ","pages":"Article 100277"},"PeriodicalIF":0.0,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654990","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":"Eco-efficient synthesis of cinnamic-compounds as antifouling additives for marine coatings","authors":"Analía Paola ,&nbsp;Ángel Sathicq ,&nbsp;Míriam Pérez ,&nbsp;Gustavo Romanelli ,&nbsp;Guillermo Blustein","doi":"10.1016/j.scenv.2025.100275","DOIUrl":"10.1016/j.scenv.2025.100275","url":null,"abstract":"<div><div>Marine pollution in ports caused by biocides-based antifouling paints is a growing problem worldwide. In this paper we present a new sustainable alternative to reduce the use of copper and booster biocides in marine antifouling paints. In this way, five cinnamic acids and four alkyl-cinnamates were synthesized using eco-efficient procedures within the guidelines of sustainable chemistry. Experimental marine paints were formulated with these compounds and their antifouling performance was evaluated after 90 days of immersion in Mar del Plata harbor. Ecotoxicity-test on <em>Artemia salina</em> nauplii was also performed. Field and laboratory results indicate that 3,4,5-trimethoxycinnamic acid and isobutyl-cinnamate are promising additives for marine paints.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"11 ","pages":"Article 100275"},"PeriodicalIF":0.0,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144631392","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":"A review on effect of operational parameters for the degradation of azo dyes by some advanced oxidation processes","authors":"John Elisa Kumar,&nbsp;Mihir Kumar Sahoo","doi":"10.1016/j.scenv.2025.100274","DOIUrl":"10.1016/j.scenv.2025.100274","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Azo dyes are widely used in industries such as textiles and paper, but their complex molecular structures make them resistant to conventional wastewater treatments. Advanced oxidation processes (AOPs) have emerged as efficient alternatives by generating highly reactive radicals for effective degradation. These processes are based on the generation of highly reactive oxidative species, such as hydroxyl radicals and sulphate radicals, for the destruction of the toxic organic pollutants into carbon dioxide, water, and inorganic salts. This study reviews AOPs such as Fenton and Fenton-like processes, UV photolysis, and photo-Fenton methods for azo dye degradation. The Fenton process (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;Fe&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;H&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) produces hydroxyl radicals at an optimal pH of ∼3, while the Fenton-type process (&lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;Fe&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt;/&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msubsup&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;8&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) generates sulfate radicals with higher oxidation potential (2.5–3.1 V). UV-assisted processes enhance oxidation by accelerating radical formation. Photo-Fenton and photo-Fenton-type processes integrate UV light to improve &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;Fe&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; regeneration, minimizing sludge formation and increasing efficiency. The efficiency of this process does not depend on a single parameter but on numerous parameters such as the concentration of the oxidant, catalyst doses, pH, treatment period, etc., to attain maximum removal of contaminants. Therefore, it becomes very challenging for the researchers to design an effective and efficient process under suitable operational parameters for the treatment processes. Excess oxidants cause radical scavenging, while inorganic anions (&lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;Cl&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mrow&gt;&lt;mi&gt;CO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mrow&gt;&lt;mi&gt;HCO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mrow&gt;&lt;mi&gt;PO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;4&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt;) can inhibit degradation. Temperature (∼25–30°C) affects reaction rates, while excess &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;Fe&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; can lead to sludge formation. Given their economic feasibility and environmental sustainability, AOPs offer a promising solution for mitigating dye pollution and improving wastewater treatme","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"11 ","pages":"Article 100274"},"PeriodicalIF":0.0,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662405","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":"Morphology influence on charge carrier dynamics in photocatalytic CO2 conversion: Comparative analysis between TiO2 nanopowder and nanofibers","authors":"Karan Gehlot ,&nbsp;Anil Chandra Kothari ,&nbsp;Sangeeta Tiwari ,&nbsp;Rajaram Bal ,&nbsp;Sandeep Kumar Tiwari","doi":"10.1016/j.scenv.2025.100272","DOIUrl":"10.1016/j.scenv.2025.100272","url":null,"abstract":"<div><div>Climate change and greenhouse gas emissions have sparked interest in developing efficient CO₂ conversion technology. Photocatalytic CO₂ conversion, using semiconductor materials like Titanium dioxide (TiO₂), has shown promise through solar-powered processes. The efficiency of these photocatalysts depends on understanding charge carrier dynamics. Our study compares the charge carrier kinetics in photocatalytic CO₂ conversion between TiO₂ nanopowder (TiO₂-NP) and TiO₂ nanofibers (TiO₂-NFs). The study uses advanced experimental techniques SEM, XRD, BET, Raman and UV-Vis spectroscopy to analyze the structural and morphological properties of TiO₂ nanopowder and nanofibers, demonstrating their various morphologies. The results show significant differences between the two materials, TiO₂ nanofibers have reduced recombination rates and longer lifetimes due to enhanced charge separation and increased surface-to-volume ratio. TiO₂ nanopowder's increased crystallinity and larger grain size make it harder to segregate charges, leading to shorter lifetimes and higher recombination rates. As result, distinct peaks were seen in the HPLC study of CO₂ conversion over the catalysts for methanol and ethanol with enhanced yield of 182.8 and 216.0 mcg/l respectively for nanofibers. These findings could guide the design and optimization of TiO₂-based photocatalysts for effective CO₂ conversion.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"11 ","pages":"Article 100272"},"PeriodicalIF":0.0,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144631391","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":"Production of bioethanol and aroma compounds from pretreated coffee shell and coffee silverskins with binary and ternary deep eutectic solvents","authors":"Prapakorn Tantayotai ,&nbsp;Elizabeth Jayex Panakkal ,&nbsp;Charoen Trisomboon ,&nbsp;Thanyarat Singphrom ,&nbsp;Suchata Kirdponpattara ,&nbsp;Santi Chuetor ,&nbsp;Nagaraju Kottam ,&nbsp;Widya Fatriasari ,&nbsp;Yu-Shen Cheng ,&nbsp;Malinee Sriariyanun","doi":"10.1016/j.scenv.2025.100276","DOIUrl":"10.1016/j.scenv.2025.100276","url":null,"abstract":"<div><div>Coffee shells and silverskins, which are underutilized by-products of the coffee processing industry, offer the potential for value-added products. This study investigated the use of binary and ternary deep eutectic solvents (DESs), choline chloride/oxalic acid (Chcl/OA), and choline chloride/oxalic acid/glycerol (Chcl/OA/Gly), respectively, to pretreat these residues to enhance efficiencies of downstream processes. Optimization experiments identified the optimal pretreatment conditions for coffee shells at 173 min, 120 °C, and 13.99 % and 15.76 % solid loading for binary and ternary DES, respectively. For coffee silverskins, 180 min, 120 °C, and 10 % and 10.21 % solid loadings were found to be optimal. Ternary DES pretreatment enriched the cellulose content and removed hemicellulose and lignin. Enzymatic hydrolysis after pretreatment yielded a two-fold increase in glucose for coffee shells (205.55 mg/g raw biomass) with binary DESs and for coffee silverskins (179.14 mg/g raw biomass) with ternary DESs. Fermentation with <em>Saccharomyces cerevisiae</em> and <em>Kluyveromyces marxianus</em> increased ethanol yields by up to 75 % for coffee shells and 77 % for coffee silverskins. The maximum yields of ethanol production of 33.29 g/L and 32.05 g/L, respectively, were obtained from coffee shells and silverskins, respectively, by using <em>K. marxianus</em>. Volatile aroma compounds, including phenylethyl alcohol and ethyl acetate, were produced during fermentation, indicating potential applications in food and cosmetics. The ternary DES demonstrated superior performance in the recovery of the cellulose content and improvement of ethanol yield, warranting further research to optimize volatile compound production for industrial use.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"11 ","pages":"Article 100276"},"PeriodicalIF":0.0,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654988","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}