Journal of Materials Research and Technology, Journal Year: 2024, Volume and Issue: 30, P. 3584 - 3593
Published: April 12, 2024
The safety and reliability of high-speed trains depend on the brake disc. In order to improve lifetime disc reduce waste resources, a coating with higher microhardness well wear resistance is urgently needed. effect chromium content microstructure, NiCr has been studied. Nano-crystalline Ni coatings superior mechanical properties were successfully prepared 30CrNiMo steel substrate by pulse current electrodeposition method. inclusion formic acid sodium citrate was found significantly expedite co-deposition Cr. various Cr contents at densities ranging from 200-300 mA/cm2. These enhance substrate. increased 603 HV, outperforming pure 119 HV. Additionally, rate decreased 50% load 10 N in comparison coating. high attributed grain refinement solution strengthening. This study addresses challenges associated electrodepositing Ni-based lays theoretical foundation for utilization tribological materials used train
Language: Английский
Citations
6Study on the Accumulation of Heavy Metals in Different Soil-Crop Systems and Ecological Risk Assessment: A Case Study of Jiao River Basin
Agronomy, Journal Year: 2023, Volume and Issue: 13(9), P. 2238 - 2238
Published: Aug. 26, 2023
The purpose of this study is to evaluate the bio-accumulation different soil-crop systems (SCSs) for heavy metals (HMs) and geo-accumulation agricultural growing regions. ecological risk (ER) assessment was conducted understand impact intensive production on environment. To achieve aim, four typical crops, wheat, corn, potatoes, leeks grown in Jiao River Basin (JRB), were selected as research objects. concentrations eight HMs, including copper (Cu), lead (Pb), zinc (Zn), nickel (Ni), chromium (Cr), cadmium (Cd), arsenic (As), mercury (Hg) crop tissue soil detected. statistical analysis, index (Igeo), geostatistical correlation cluster analysis then used contamination determine source types HMs. results show that average HMs follow order: Zn > Cr Ni Pb Cu As Cd Hg calculated concentration coefficients (K) vary from 0.41–1.12, indicating relative scarcity sources All Igeo values are less than 0 except within potato-farmland 1, illustrating JRB uncontaminated. reveal Cu, Zn, have a strong relationship with each other between Pb, Ni, general. content crops varies greatly most them scope National Food Safety Standards—Limit Pollutants food China. bioconcentration factors (BCF) indicate potato, leek ability Cd. factor (Er) shows low Cr, As; however, mostly low, characterized by partially dotted moderate risk. (RI) mainly distributed planar high point.
Language: Английский
Citations
15Effects of Soil, Water and Air Pollution with Heavy Metal Ions Around Lead and Zinc Mining and Processing Factories
Water Air & Soil Pollution, Journal Year: 2023, Volume and Issue: 234(12)
Published: Dec. 1, 2023
Language: Английский
Citations
12Evaluating Groundwater Metal and Arsenic Content in Piatra, North-West of Romania
Water, Journal Year: 2024, Volume and Issue: 16(4), P. 539 - 539
Published: Feb. 9, 2024
The present study introduces a monitoring initiative focused on the quality of groundwater in Piatra locality, situated North-West region Romania. This paper employs an evaluation 21 physico-chemical parameters, encompassing factors such as electrical conductivity, pH, chemical oxygen demand, turbidity, total hardness, NH4+, NO3−, Cl−, PO43−, Li, Na, K, Ca, Mg, Ba, Sr, Al, Fe, Mn, Sn, and Ti. Additionally, it examines five heavy metals (Cr, Cu, Ni, Pb, Zn) arsenic water sourced from six distinct private wells. Each well, with its characteristics, serves unique drinking source. assessment encompassed pollution levels, status, risk for all sources, utilizing pollution, quality, indices. aim this was to establish level toxicity water, assess impact human health, disseminate information public about appropriate utilization individual sources. results indicated general contamination chloride, ammonium, manganese, chromium, iron. Human health indices revealed that consumption studied waters presented non-carcinogenic risks associated Cr adults Cr, As, Cu children some index (WQI) categorizes samples possessing excellent good quality. research represents one initial endeavors source connection potential posed by within protected area Tisa River Basin.
Language: Английский
Citations
4Green low-cost synthesis of zero-valent iron nanoparticles from Palm Petiole Extract for Cr(VI) removal from water
Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(31), P. 44272 - 44288
Published: June 28, 2024
Abstract One of the hottest research topics over last decades was valorization or/and recycling agro-industrial wastes into different valuable liquid or solid products, which is considered a sustainable and low-cost approach. In this study, we developed zero-valent iron nanoparticles from Palm Petiole Extract (P-NZVI) using green straightforward The as-synthesized P-NZVI used to adsorb Cr(VI) in water. physico-chemical characterizations P-NZVI, including particle size, crystalline structure, surface area, morphology, functional groups, were investigated via several techniques such as UV-vis spectroscopy, SEM, TEM, XRD, FTIR, AFM, DLS, pH ZPC measurement, BET analysis. adsorption performance studied under operational parameters, pollutant concentration, pH, temperature, adsorbent mass. rate found be 89.3% within 40 min, corresponding capacity 44.47 mg/g following conditions: initial concentration mg/L, 5, dosage 1 g/L. It that pattern follows Langmuir pseudo-second-order kinetic models, indicating combination monolayer chemisorption mechanisms. thermodynamic study shows process endothermic spontaneous. reusability carried out four times, showing slight decrease 89.3 87%. These findings highlight P-NZVI’s could an effective for removing other types toxic pollutants
Language: Английский
Citations
4Cr(VI) removal performance from wastewater by microflora isolated from tannery effluents in a semi-arid environment: a SEM, EDX, FTIR and zeta potential study
Frontiers in Microbiology, Journal Year: 2024, Volume and Issue: 15
Published: July 1, 2024
Hexavalent chromium removal from the environment remains a crucial worldwide challenge. To address this issue, microbiological approaches are amongst straightforward strategies that rely mainly on bacteria's and fungi's survival mechanisms upon exposure to toxic metals, such as reduction, efflux system, uptake, biosorption. In work, scanning electron microscopy, energy-dispersive X-ray spectrophotometry, Fourier transform infrared spectroscopy, zeta potential measurements were used investigate ability of adsorption by
Language: Английский
Citations
4A Comprehensive Review of Lab-Scale Studies on Removing Hexavalent Chromium from Aqueous Solutions by Using Unmodified and Modified Waste Biomass as Adsorbents
Toxics, Journal Year: 2024, Volume and Issue: 12(9), P. 657 - 657
Published: Sept. 8, 2024
Anthropogenic activities and increasing human population has led to one of the major global problems heavy metal contamination in ecosystems generation a huge amount waste material biomass. Hexavalent chromium [Cr(VI)] is contaminant introduced by various industrial effluents into ecosystem. Cr(VI) known mutagen carcinogen with numerous detrimental effects on health humans, plants, animals, jeopardizing balance ecosystems. Therefore, remediation such hazardous toxic pollutant from environment necessary. Various physical chemical methods are available for sequestration metals. However, adsorption recognized as more efficient technology remediation. Adsorption utilizing biomass adsorbents sustainable approach remediating pollutants, thus serving dual purpose exploiting an eco- friendly manner. Agricultural biomass, residues, forest food primary that could be employed, different strategies, Cr(VI). This review focuses use diverse agricultural by-products, effective aqueous solutions. The also operational conditions improve remediation, describes efficacy materials modifications, assesses general sustainability these approaches reducing pollution.
Language: Английский
Citations
4Occurrence and enrichment mechanisms of groundwater hexavalent chromium in typical loess area of China
Environmental Pollution, Journal Year: 2025, Volume and Issue: 367, P. 125654 - 125654
Published: Jan. 7, 2025
Language: Английский
Citations
0A Glycopeptide from Agaricus balchaschensis Mitigates Cadmium Damage in Mice
Processes, Journal Year: 2025, Volume and Issue: 13(1), P. 168 - 168
Published: Jan. 9, 2025
This study was aimed at extracting, characterizing, and exploring the detoxification activity of peptide-containing polysaccharide from Agaricus balchaschensis. An anion adsorption fraction acquired through hot water extraction. Its structure analyzed, potential protective effect against cadmium-intoxicated mice explored. Structural analysis revealed that principal component A. balchaschensis (ABPCP) is polysaccharide, which consists glucose, mannose, galactose, xylose, containing (1 → 4)-linked α-D-glucan, 3)-linked β-D-Glcp, 6)-linked β-D-Manp, β-D-Galp, β-D-xylan. The amino acid content ABPCP 11.747 mg/g. Threonine, serine, glutamate, glycine, alanine, cysteine, valine, methionine, lysine, arginine were detected in ABPCP, among glutamate highest. alleviating on cadmium poisoning investigated. significantly reduced serum heart, kidneys, liver, indicates could promote discharge. also decreased nitric oxide, endothelin-1, urea, uric acid, creatinine, kidney liver damage caused by cadmium. All these results manifest can lower organs alleviate to kidneys livers damaged Cd.
Language: Английский
Citations
0Green adsorbents for water remediation: Removal of Cr(vi) and Ni(ii) using Prosopis glandulosa sawdust and biochar
Green Processing and Synthesis, Journal Year: 2025, Volume and Issue: 14(1)
Published: Jan. 1, 2025
Abstract Potentially toxic elements like Cr +6 and Ni +2 cause severe health hazards. Therefore, the current work was aimed at cleaning water using Prosopis glandulosa raw sawdust (SD) its derived biochar (AC). Both adsorbents were characterized via SEM, FTIR spectroscopy, EDX, TGA applied for effective removal of Ni( ii ) Cr( vi optimum values experimental conditions, mechanism assessed adsorption isotherm kinetic models. The correlation coefficient R 2 confirmed pseudo-second-order kinetics preferred Freundlich model. Maximum iv obtained a pH 4.0, bio-sorbent concentration 0.8 g·L −1 , temperature 50°C 50 min with metal 110 ppm, while maximum contact time 70 130 ppm in above-mentioned conditions. results isotherms model revealed that processes involved multilayer formation on biosorbent’s heterogeneous surface. Also, their thermodynamic investigation showed process is spontaneous exothermic and, therefore, can be effectively utilized to remove from water.
Language: Английский
Citations
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