Microplastic sources, formation, toxicity and remediation: a review

Environmental Chemistry Letters, Journal Year: 2023, Volume and Issue: 21(4), P. 2129 - 2169

Published: April 4, 2023

Abstract Microplastic pollution is becoming a major issue for human health due to the recent discovery of microplastics in most ecosystems. Here, we review sources, formation, occurrence, toxicity and remediation methods microplastics. We distinguish ocean-based land-based sources Microplastics have been found biological samples such as faeces, sputum, saliva, blood placenta. Cancer, intestinal, pulmonary, cardiovascular, infectious inflammatory diseases are induced or mediated by exposure during pregnancy maternal period also discussed. Remediation include coagulation, membrane bioreactors, sand filtration, adsorption, photocatalytic degradation, electrocoagulation magnetic separation. Control strategies comprise reducing plastic usage, behavioural change, using biodegradable plastics. Global production has risen dramatically over past 70 years reach 359 million tonnes. China world's top producer, contributing 17.5% global production, while Turkey generates waste Mediterranean region, at 144 tonnes per day. 75% marine waste, with responsible 80–90% pollution, account only 10–20%. induce toxic effects on humans animals, cytotoxicity, immune response, oxidative stress, barrier attributes, genotoxicity, even minimal dosages 10 μg/mL. Ingestion animals results alterations gastrointestinal tract physiology, system depression, differential gene expression, growth inhibition. Furthermore, bioaccumulation tissues aquatic organisms can adverse ecosystem, potential transmission birds. Changing individual behaviours governmental actions, implementing bans, taxes, pricing carrier bags, significantly reduced consumption 8–85% various countries worldwide. The microplastic minimisation approach follows an upside-down pyramid, starting prevention, followed reducing, reusing, recycling, recovering, ending disposal least preferable option.

Language: Английский

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Green synthesis of bimetallic Ag/ZnO@Biohar nanocomposite for photocatalytic degradation of tetracycline, antibacterial and antioxidant activities

Scientific Reports, Journal Year: 2022, Volume and Issue: 12(1)

Published: May 5, 2022

In this work, a simple and green synthesis procedure for phytofabrication Zinc oxide-silver supported biochar nanocomposite (Ag/ZnO@BC) via Persicaria salicifolia biomass is investigated the first time to uphold numerous chemistry such as less hazardous chemical syntheses. XRD technique showed crystal structure of phytosynthesized Ag/ZnO@BC, whereas UV-visible spectroscopy, FT-IR, SEM, EDX, TEM, XPS analyses indicated successful biosynthesis nanocomposite. Testing photocatalytic potential novel in removal TC under different conditions unraveled its powerful photodegradation efficiency that reached 70.3% optimum reaction conditions: concentration; 50 ppm, pH; 6, dose Ag/ZnO@BC; 0.01 g, temperature; 25 °C, H2O2 100 mM. The reusability Ag/ZnO@BC was evident it 53% after six cycles regeneration. also shown be potent antimicrobial agent against Klebsiella pneumonia well promising antioxidant material. Therefore, current work presented could efficiently employed various environmental medical applications.

Language: Английский

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Floatable cellulose acetate beads embedded with flower-like zwitterionic binary MOF/PDA for efficient removal of tetracycline

Journal of Colloid and Interface Science, Journal Year: 2022, Volume and Issue: 620, P. 333 - 345

Published: April 7, 2022

Language: Английский

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Materials, fuels, upgrading, economy, and life cycle assessment of the pyrolysis of algal and lignocellulosic biomass: a review

Environmental Chemistry Letters, Journal Year: 2023, Volume and Issue: 21(3), P. 1419 - 1476

Published: Feb. 24, 2023

Abstract Climate change issues are calling for advanced methods to produce materials and fuels in a carbon–neutral circular way. For instance, biomass pyrolysis has been intensely investigated during the last years. Here we review of algal lignocellulosic with focus on products mechanisms, oil upgrading, combining anaerobic digestion, economy, life cycle assessment. Products include oil, gas, biochar. Upgrading techniques comprise hot vapor filtration, solvent addition, emulsification, esterification transesterification, hydrotreatment, steam reforming, use supercritical fluids. We examined economic viability terms profitability, internal rate return, return investment, carbon removal service, product pricing, net present value. also reviewed 20 recent studies found that method highly influenced yield, ranging from 9.07 40.59% 10.1 41.25% biochar, 11.93 28.16% syngas. Feedstock type, pyrolytic temperature, heating rate, reaction retention time were main factors controlling distribution products. Pyrolysis mechanisms bond breaking, cracking, polymerization re-polymerization, fragmentation. Biochar residual forestry could sequester 2.74 tons dioxide equivalent per ton biochar when applied soil thus potential remove 0.2–2.75 gigatons atmospheric annually. The generation bio-oil process is estimated be economically feasible.

Language: Английский

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A comprehensive review on LDH-based catalysts to activate persulfates for the degradation of organic pollutants

npj Clean Water, Journal Year: 2023, Volume and Issue: 6(1)

Published: April 25, 2023

Abstract Degradation of organic contaminants into less toxic substances is the best option to remove these compounds rather than using conventional techniques. The sulfate radical-based-advanced oxidation process an effective strategy that degrades by activating peroxymonosulfate (PMS). Such a generates singlet oxygen ( 1 O 2 ), hydroxyl $$^ \bullet \!{{{\mathrm{OH}}}}$$ ∙OH and $${{{\mathrm{SO}}}}_4^{ \bullet\! - }$$ xmlns:mml="http://www.w3.org/1998/Math/MathML">SO4∙− ) radicals. \!- distinguished its high selectivity activity toward degradation contaminates compared other Various catalysts are employed in PMS activation including layered doubled hydroxides (LDHs), which characterized their facile synthesis catalytic activity. This review article first attempt compile recent progress common pollutants aromatic compounds, pharmaceutical residues, dyes via LDH-based catalysts. pathways, reaction parameters’ influence, stability LDHs, comparisons between different investigated this work.

Language: Английский

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Graphene oxide incorporated cellulose acetate beads for efficient removal of methylene blue dye; isotherms, kinetic, mechanism and co-existing ions studies

Journal of Porous Materials, Journal Year: 2022, Volume and Issue: 30(2), P. 607 - 618

Published: Oct. 27, 2022

Abstract In this investigation, new porous adsorbent beads were formulated via the incorporation of graphene oxide (GO) into cellulose acetate (CA) for adsorptive removal methylene blue (MB) dye. The experimental results signified that adsorption MB dye increased with increase in GO ratio from 10 to 25%. addition, process obeyed PSO kinetic model and Langmuir isotherm a maximum capacity reaching 369.85 mg/g. More importantly, it was proposed mechanism onto GO@CA proceeded electrostatic interactions, H-bonding, van der Waals forces, n-π π -π interactions. Besides, fabricated exhibited an excellent ability recycle reuse after five successive cycles. there high selectivity towards molecules presence co-existing cations such as Fe 2+ , Zn Cu Ni .

Language: Английский

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Sulfonated graphene oxide impregnated cellulose acetate floated beads for adsorption of methylene blue dye: optimization using response surface methodology

Scientific Reports, Journal Year: 2022, Volume and Issue: 12(1)

Published: June 4, 2022

Abstract New multi-featured adsorbent beads were fabricated through impregnation of sulfonated graphene (SGO) oxide into cellulose acetate (CA) for fast adsorption cationic methylene blue (MB) dye. The formulated SGO@CA composite thoroughly characterized by several tools including FTIR, TGA, SEM, XRD, XPS and zeta potential. optimal levels the most significant identified variables affecting process sequential determined response surface methodology (RSM) using Plackett–Burman Box–Behnken designs. gained results denoted that displayed higher negative charges (− 42.2 mV) compared to − 35.7 38.7 mV pristine CA SGO, respectively. In addition, floated demonstrated excellent floating property, easy separation. performance was accomplished rapidly, since equilibrium closely gotten within 30 min. Furthermore, capacity greatly improved with increasing SGO content from 10 30%. obtained data followed pseudo-second order kinetic model agreed Langmuir isotherm a maximum reached 234.74 mg g −1 . thermodynamic studies designated spontaneity endothermic nature MB dye adsorption. Besides, exposed acceptable characteristics six successive reuse cycles, in addition their better selectivity towards crystal violet anionic Congo red dyes. These findings assume could be used effectively as highly efficient, separable reusable adsorbents removal toxic

Language: Английский

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Phytofabrication of bimetallic silver-copper/biochar nanocomposite for environmental and medical applications

Journal of Environmental Management, Journal Year: 2022, Volume and Issue: 316, P. 115238 - 115238

Published: May 13, 2022

Language: Английский

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Efficient removal of noxious methylene blue and crystal violet dyes at neutral conditions by reusable montmorillonite/NiFe2O4@amine-functionalized chitosan composite

Scientific Reports, Journal Year: 2022, Volume and Issue: 12(1)

Published: Sept. 15, 2022

Abstract The jeopardy of the synthetic dyes effluents on human health and environment has swiftly aggravated, threatening survival. Hence, sustained studies have figured out most acceptable way to eliminate this poisonous contaminant. Thereby, our investigation aimed fabricate montmorillonite/magnetic NiFe 2 O 4 @amine-functionalized chitosan (MMT-mAmCs) composite as a promising green adsorbent remove cationic methylene blue (MB) crystal violet (CV) from wastewater in neutral conditions. Interestingly, MMT-mAmCs carries high negative charges at wide pH range 11 clarified zeta potential measurements, asserting its suitability adsorb contaminants. In addition, experimental study confirmed that optimum both MB CV was 7, inferring ability simple process Furthermore, ferromagnetic behavior is additional merit provides facile, fast, flawless separation. Notably, as-fabricated revealed an auspicious adsorbability towards adsorptive removal CV, since maximum adsorption capacity were 137 118 mg/g, respectively. Moreover, isotherm kinetic investigatins depicted fitted Langmuir Pseudo 2nd order models, Besides, advanced preserved satisfactory characteristics with maximal efficacy exceeding 87% after reuse for ten consecutive cycles. More importantly, efficiently adsorbed real agricultural water, Nile river water samples medium, reflecting potentiality be superb reusable candidate pollutants their aquatic media.

Language: Английский

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Adsorption of nitrophenol onto a novel Fe3O4-κ-carrageenan/MIL-125(Ti) composite: process optimization, isotherms, kinetics, and mechanism

Environmental Science and Pollution Research, Journal Year: 2023, Volume and Issue: 30(17), P. 49301 - 49313

Published: Feb. 11, 2023

Water pollution is a dreadful affair that has incessantly aggravated, exposing our planet to danger. In particular, the persistent nitro aromatic compound like nitrophenols causes anxiety researchers due their hazardous impacts, excessive usage, and removal difficulty. For this purpose, novel multi-featured composite was constructed based on κ-Carrageenan (κ-Carr), MOF (MIL-125(Ti)), magnetic Fe

Language: Английский

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