JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Shuai Tang,Lujian Lin,Xuesong Wang,Anqi Yu,Xuan Sun
In water environments, nylon microplastics (MPs) and heavy metals are two kinds of common pollutants. This study investigated the adsorption of three divalent metals (Cu(II), Ni(II), Zn(II)) onto collected nylon MPs as function of contact time, temperature, solution pH, ionic strength and concentration of fulvic acid (FA). The kinetic data fitted well with the Elovich and pseudo-second order equations. The result of shrinking core model (SCM) confirms that the adsorption of Cu(II) and Zn(II) was mainly controlled by intraparticle diffusion. The adsorption of three metal ions onto collected nylon MPs is spontaneous, endothermic, with an increased randomness in nature. The Langmuir and Freundlich models successfully described the adsorption isotherms. The speciation distributions of three divalent metals in aqueous solutions were identified to analyze the effects of initial solution pH, ionic strength and fulvic acid concentrations on the adsorption amounts. X-ray photoelectron spectroscopy (XPS) analysis indicates the importance of surface O-containing groups of collected nylon MPs in controlling the adsorption of three metal ions. This research provides a clear theoretical basis for the behavior of nylon MPs as heavy metals (Cu(II), Ni(II), Zn(II)) carrier and highlights their environmental toxicity, which deserves to be further concerned.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Linyu Guo,Wei Qian,Ren-kou Xu
Iron/aluminum (Fe/Al) oxides and fulvic acid (FA) are omnipresent in nature, and their interaction determines the migration and immobilization of copper (Cu). In this study, we provide new insights into the understanding of the differential mechanisms for Cu(II) immobilization at the interaction interfaces of Fe/Al oxides with FA. The immobilization behaviors and mechanisms of Cu(II) at the Fe/Al oxides-FA interaction interfaces were elucidated under different coexistence levels of 3 wt% and 5 wt% FA, and at solution pH of 4.0 −6.0 based on batch adsorption experiments, liquid-phase Cu(II) species assessment by Cu ion-selective electrodes, the surface charge analysis by zeta potential measurement and potentiometric titration, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS). The results showed that the Cu(II) adsorption capacity at the Fe/Al oxide-FA interaction interfaces followed: amorphous (Am)·Fe > goethite > Am·Al > gibbsite. Fe oxides showed greater Cu(II) immobilization capacity and affinity than Al oxides. The concentration of Cu(II) complexed with FA in the liquid phase followed: goethite > Am·Fe and gibbsite > Am·Al, which showed that the strong adsorption of FA by the oxides resulted in a lower concentration of Cu(II) complexed with FA in the liquid phase (FA adsorption followed: Am·Fe > Am·Al > goethite > gibbsite). The free Cu 2 + decreased with the increase of FA coexistence. BET and surface charge analyses showed that the larger specific surface area, less positive charge and higher binding sites and higher FA adsorption capacity of Am·Fe and goethite contributed to their greater Cu(II) immobilization capacity. ATR-FTIR and XPS analyses revealed the abundance of surface reactive hydroxyl and oxygen vacancy defects of Am·Fe and goethite significantly promoted their Cu(II) immobilization compared with Al oxides. Principal component analysis revealed that surface reactive hydroxyl and oxygen vacancy defects dominated the differences in surface charge and Cu(II) immobilization, and quantified their contributions.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
MENDELEEV COMMUNICATIONS
·
2017
·
IF 1.741
Ivan P. Pozdnyakov,Victoria A. Salomatova,Marina V. Parkhats,Boris M. Dzhagarov,Nikolai M. Bazhin
pH-dependent efficiency of singlet oxygen ( 1 O 2 ) generation by fulvic acids (FAs) from different sources was estimated by time-resolved luminescence technique. All FAs turn up the highest quantum yields of 1 O 2 for neutral and alkali solutions [ ϕ 532 ( 1 O 2 )] = (0.3•2.5)í10 •2 ] and 3•5-fold decrease in ϕ 532 ( 1 O 2 ) for acidic solutions. Potential of FA ChangSheng (the best 1 O 2 generating agent among investigated FAs) in relation to photodegradation of non-UVA-absorbing herbicide Amitrole (3-amino-1,2,4-triazole) was demonstrated.
研究领域:
环境科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 26
·26069-26078
·
IF 2.8
Peng Na,Wang Kaifeng,Lin Siwu,Wu Libin
Photolysis of the widely used beta-blocker propranolol (PRO) was investigated in the presence of fulvic acid (FA) and inorganic ions under simulated solar irradiation. PRO undergoes direct photolysis proceeding mainly via degradation of the triplet excited state, 3 PRO*. FA and inorganic ions inhibited photolysis of PRO in the order of FA > Fe 3+ > Cl − > Ca 2+ > Mg 2+ > NO 3 − > K + . An antagonistic effect between FA and inorganic ions toward the suppression of PRO photolysis was exhibited. The binding behaviors of PRO, FA, and inorganic ions were examined through fluorescence quenching experiments, which showed that inorganic ions affected the binding between FA and PRO through competing for the binding sites of FA or PRO. The correlation analysis demonstrated a positive correlation between the binding constant ( K OC ) of FA-PRO and the inhibition rate of FA on PRO photolysis. The observed rate constants of photolysis ( k obs ) have opposite correlations with the concentration of singlet oxygen ( 1 O 2 ). These findings strongly suggest that inorganic ions decrease the inhibition effect of FA on PRO photolysis via restraining the complexation of FA-PRO and production of 1 O 2 .
研究领域:
环境科学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Shuai Tang,Lujian Lin,Xuesong Wang,Anxin Feng,Anqi Yu
Both heavy metals and microplastic pollutants are ubiquitous in the aquatic environment. The uptake of lead(II) ions from aqueous solutions onto aged nylon microplastics was investigated as a function of pH, contact time, temperature, supporting electrolyte concentration and fulvic acid concentration in batch studies. The effect of surface properties on the adsorption behavior of lead(II) was investigated with scanning electron microscope equipped with the energy dispersive X-ray spectroscope (SEM-EDAX), Fourier transform-infrared (FTIR) spectroscopy, thermal gravimetric analysis (TGA), X-ray diffraction (XRD) and differential scanning calorimetric (DSC). The adsorption kinetics conformed to the pseudo-second order equation, Elovich equation and intraparticle diffusion model well. The experimental data of the adsorption process was fitted to the Langmuir and Freundlich adsorption isotherms and the parameters were estimated. The lead(II) uptake on aged nylon microplastics was spontaneous and endothermic in nature. The lead(II) adsorption was significantly dependent on the sodium chloride concentrations, initial solution pH and fulvic acid concentrations. Results of this study highlight the importance of surface carboxyl function group of aged nylon microplastics in controlling lead(II) adsorption.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Zhao-Jun Wu,Hua-Xiang Li,Ping-Ping Li,Zhen-Liang Xu,Zi-Ming Zhan,Yu-Zhe Wu
A novel thin-film composite (TFC) nanofiltration (NF) membrane was manufactured by interfacial polymerization (IP) with addition of the additive fulvic acid (FA) into the piperazine (PIP) aqueous solution onto a poly(m-phenylene isophthalamide) (PMIA) substrate. The aqueous phase additive FA can effectively modify the PA layer structure by slowing down the diffusion of the PIP monomer and reacting with trimesoyl chloride (TMC) to generate ester groups. The pure water permeability (PWP) of the optimized NF membrane enhanced from 10.4 to 22.3 L m–2 h–1 bar–1, and the Na2SO4 rejection remained above 97.8%. The outstanding performance benefited from superior hydrophilicity, enlarged pores, and a relatively thin separation layer. Furthermore, the obtained NF membrane presented ascendant thermal stability, long-term stability, and fouling resistance. Therefore, this work offers novel insight into regulation of the PA layer structure and promotion of NF membrane performance.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Panpan Chang,Jie Zheng,Yongbing Cen,Fan Yang,Xuguang Li,Qingruo Xie,Jinshi Dong
Biomass-derived porous carbons (BD-PC) have evoked wide attention in the field of supercapacitors . However, the oxygen-containing groups (OFGs) in BD-PC bring a great threat to the structural stability of porous carbons in organic electrolyte at the voltage window higher than 2.7 V. Therefore, it is a worthwhile challenge to construct BD-PC with very-low content of OFGs which can operate stably at the ultrahigh voltage window. Herein, the green and renewable fulvic acid biomass is used as carbon precursor to construct 3D hierarchical porous carbon (HPC) with high yield of 13.3% by KOH activation and annealing method. This HPC presents continuous carbon network with ultrathin nanosheets of 50 nm. It has high specific surface area of 3028 m 2 g −1 , good e -conductivity of 43 S m −1 , ultrahigh C/O ratio of 27.4 and high sp 2 carbon content of 90%. Thus, the voltage window upper limits can be raised up to 3 V in TEABF 4 /PC and 3.5 V in EMIMBF 4 electrolytes. In TEABF 4 /PC electrolyte, this HPC displays high C g of 124 F g −1 at 0.05 A g −1 with C 10/0.05 as high as 70.8% and ultralong lifespan of 94% after 20,000 cycles. In EMIMBF 4 electrolyte, the energy density can reach up to 56.6 Wh kg −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Yuhe Ran,Ru’an Chi,Zhenyue Zhang,Yuting Shi,Wendou Chen,Fei Long,Hanjun Wu
Weathered rare earth ores are an important strategic mineral resource in China, and they are the primary source of medium and heavy rare earths (MHRE). The efficient recovery of MHRE is of great significance from an industrial standpoint. In this study, fulvic acid (FA) is employed as a precipitant to investigate the precipitation of rare earth (RE). The results indicate that the precipitation rates ( w ) of RE range from 89.69 wt% to 99.86 wt% with the pH of 9, the molar ratio of 2, and the temperature of 40 °C, except for Lu 3+ , the w reaches 97.33 wt% with the pH of 9, the molar ratio of 3, and the temperature of 25 °C. The w of RE in the ammonium acetate rare earth leaching solution ranges from 95.99 wt% to 98.54 wt%, with the MH/L of the rare earth distribution after precipitation increasing from 0.77 to 0.80. The use of FA as a precipitant is demonstrated to yield effective precipitation of RE, particularly those of MHRE. FA complexes with RE 3+ , where deprotonation of COO – increases the surface electron density of oxygen atoms, creating additional active sites for electron-deficient RE 3+ . The mechanism provides a theoretical basis for using carboxylic acid compounds as new precipitants. Further, a novel technology for FA complexation precipitation of RE from lignite extract is proposed.
研究领域:
化学工程
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矿物加工
·
环境科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Duanjie Wang,Lei Li,Yingrui Chen,Qian Guo,Dongmei Yu,Dan Yu,Ting Zhao,Shiqiang Wei
Simultaneously extracting phosphate (HPO 4 2- ) and ammonia nitrogen (NH 4 + ) nutrients from the wastewater is of great importance but still poses a challenge as HPO 4 2- and NH 4 + hold opposite charge. In this study, a novel multifunctional composite material (LDH-FA) was prepared through a straightforward flocculation reaction between positively charged layered double hydroxide (LDH) nuclei with negative fulvic acid (FA) macromolecule to synergistic extraction of HPO 4 2- and NH 4 + from liquid digestate. The results show that LDH-FA can capture HPO 4 2- by anion exchange of LDH while simultaneously adsorb NH 4 + through electrostatic attraction of FA. The Zeta potential of LDH-FA is reduced after HPO 4 2- adsorption which further promotes the NH 4 + adsorption, exhibiting a synergistic adsorption performance for HPO 4 2- and NH 4 + . The adsorption capacity of LDH-FA for P can reach 13.7 mg/g, while simultaneously achieving a N adsorption capacity of 279.4 mg/g in liquid digestate. Coexisting ions such as HCO 3 - , SO 4 2- , K + do not impede the adsorption; however, sufficient HPO 4 2- content is crucial for the synergistic adsorption. Through six consecutive adsorption cycles with the supplementary addition of HPO 4 2- after each adsorption, the cumulative removal rates for P and N can reach 99.1 % and 91.3 %, respectively, with average adsorption capacities of 12.1 mg/g and 116.7 mg/g.
研究领域:
环境科学
·
废水处理
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2024
·Vol. 19
·期 1
·1-14
·
IF 6.1
Huang Na,Chen Yuanyuan,Yuan Xuyin,Li Yingying,Lu Yin,Jiang Yilan,Xu Huacheng,Ren Lingxiao,Wang Dawei
The photochemical interactions between nitrate (NO 3 − ) and natural organic matter (NOM) are vital for aquatic chemistry. However, the effects of guest iron minerals, which may enter the aquatic environments due to both human and natural activities, on those interactions are widely ignored. This work evaluated the effects of hematite ( α -Fe 2 O 3 ) on the photochemical conversion products and pathways of NO 3 − , fulvic acid (FA) under 12 h of ultraviolet irradiation. The addition of 0.4 g/L of guest α -Fe 2 O 3 accelerated the reduction of NO 3 − by 24.3%, with NH 4 + as the primary reduction product, and hampered the mineralization of FA. These effects were dependent on the dosage amount of α -Fe 2 O 3 and FA concentrations. The studies on the molecule-level changes of FA revealed that the complete oxidation to CO 2 and the partial oxidation pathways that alter the molecular composition of FA were suppressed, and the mineralization rate decreased by 27.8%. Particularly, the conversion rates of CHON and CHONS were reduced by 21.0% and 20.3%, respectively, increasing the unsaturated products. The scavenging experiments and quantitative measurements of hydroxyl radicals (•OH) proposed that the photogenerated electrons and holes from α -Fe 2 O 3 were the key for the altered transformation of NO 3 − and FA. This work revealed the guest effects of iron mineral particles on the photochemical interactions between NO 3 − and NOM in the natural surface waters.
研究领域:
环境科学
·
水文学
·
化学
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2023
·Vol. 88
·期 7
·1863-1874
·
IF 2.7
Yin Zhiming,Liu Siyu,Tian Zhen,Zhao Xinyue,He Jun,Wang Chengjun
View large Download slide View large Download slide Close modal In this work, the formation of carbon-based nanomaterials–fulvic acid (CNMs-FA) composites and their capacities for the adsorption and photodegradation of typical organic contaminants in aqueous solutions were investigated. The results suggested that the formation of CNMs-FA composites was dominated by adsorbing FA on CNMs via the physisorption process, which fit the pseudo-first-order kinetic model and the Langmuir isotherm model. The formed CNMs-FA composites were characterized by using the Brunauer–Emmett–Teller, scanning electron microscopy, and infrared spectroscopy techniques and further applied for examining their effects on the adsorption and photodegradation of selected organic contaminants in aqueous solutions. The adsorption of organic contaminants on CNMs-FA composites is mainly involved in hydrogen bonding and electrostatic interactions between organic contaminants and FA species adhering to CNMs. In addition, the CNMs-FA composites are able to promote the photosensitive degradation of organic contaminants due to the photogenerated reactive species including ROS and CNMs-3FA* under sunlight irradiation. This study provided a deeper and more comprehensive understanding of the environmental behavior of CNMs in real natural surface water and clarified the underlying mechanisms. Carbon-based nanomaterials (CNMs) preferentially adsorb fulvic acid to form CNMs-FA in environmental water. Adsorption of FA on CNMs fits pseudo-first-order kinetic and Langmuir isotherm models. CNMs-FA can adsorb organic pollutants via hydrogen bonding and electrostatic interactions. CNMs-FA promotes the photodegradation of organic pollutants under sunlight irradiation.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Chuan-Shu He,Rong-Rong Ding,Jia-Qi Chen,Guan-Nan Zhou,Yang Mu
While ubiquitous natural organic matters (NOMs) are capable of enhancing zero-valent iron (ZVI) performance under aerobic conditions , there is limited understanding of how the properties of NOMs affect the reactivity of ZVI towards contaminants removal. Here, the corresponding activity of ZVI under aerobic conditions was investigated in the presence of humic acid (HA), fulvic acid (FA), bovine serum albumin (BSA). It was found that three models of NOMs were all effective in promoting diatrizoate (DTA) reduction via depassivating ZVI. Interestingly, fast adsorption of NOM onto ZVI surface initially caused inconspicuous impact or visible inhibition on hydrophilic DTA reduction depending on their hydrophobicity . However, subsequent exposure of more reactive sites with high hydrophilicity arising from the detachment of surfaced NOM-associated iron oxide finally contributed to the enhanced consumption of Fe 0 with the ability: HA > FA ≈ BSA, and 1-2 times increase in DTA removal kinetic rate following the order: HA > FA > BSA. It further revealed that there were two key factors in determining DTA removal under aerobic conditions, including the ability of NOMs to boost Fe 0 consumption as contributed by their aromaticity degree and amino groups, and the hydrophobicity of NOMs to initially affect the property of ZVI surfaces.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）