REACTIVE & FUNCTIONAL POLYMERS
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2024
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IF 4.5
Huiping Zeng,Xiao Sun,Siqi Sun,Weihua Zhao,Ruixia Hao,Jie Zhang,Dong Li
Combining natural polymer starch with magnetite nanoparticles (MNPs) can reduce the aggregation of MNPs and enhance their adsorption capacity and stability. Iron sludge from a de‑ironing water plant and starch were employed as basic ingredients in this study. Bare magnetite nanoparticles (MNPs) and starch-coated magnetite nanocomposites (ST 2 -MNPs) were synthesized by a “green” co-precipitation method for the removal of low-concentration As(V) solutions. TEM, XPS, FTIR, XRD, VSM, BET, and TGA techniques were used to examine the physicochemical properties of the synthesized ST 2 -MNPs. TEM verified that the magnetite nanoparticles in the composites were evenly distributed. The ST 2 -MNPs (5.26 nm) possessed a smaller average particle size than MNPs (6.24 nm). And VSM confirmed their remarkable magnetic properties. The starch-to‑iron-sludge ratio was optimized and the influence of adsorbent dosage, pH, and co-existing anions on As(V) adsorption were studied. The acquired arsenate adsorption data were found to be consistent with the Langmuir isotherm model, with maximum adsorption capacities of 23.04 mg/g for MNPs and 42.88 mg/g for ST 2 -MNPs. This shows that the active sites on MNPs and ST 2 -MNPs are energetically homogenous, and that the addition of starch coating significantly increases magnetite's adsorption capacity for As(V). The adsorption kinetics follow a Pseudo-second-order kinetic model, indicating chemisorption between As(V) and ST 2 -MNPs. In addition, the adsorption mechanism of As(V) by ST 2 -MNPs including chemical adsorption and electrostatic attraction was determined through in-depth discussion of characterization methods and adsorption experiments. This study offers references for the removal of As(V) and the resourceful application of backwash iron sludge.
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WATER RESEARCH
·
2024
·
IF 11.4
Hamza Hassan Yusuf,Pan Xiaofang,Zhi-Long Ye,Taha Abdelfattah Mohammed Abdelwahab,Ahmed Elsayed Mahmoud Fodah
To speed up reaching UN Sustainable Development Goal 6 for safe sanitation by 2030, integrating high-solid anaerobic digestion (HSAD) into decentralized systems could recycle fecal slag (FS) and food waste (FW), aiding a circular economy and toilet revolution. In this study, a percolate recirculation system and conductive material were used to improve mass transfer, stability, and enhance methane production in HSAD of FS and FW. This setup consists of a percolate tank and a digester tank, where nano-zero valent iron (nZVI) was dosed in the percolate tank (P nZVI in P ) and the digester tank (P nZVI in D ) and compared with a control with no additive (P Control ). The highest cumulative methane yield of 519.43 mL/gVS was achieved in P nZVI in D , which was 4.52 and 3.59 times higher than that of P Control (144.59 mL/gVS) and P nZVI in P (114.96 mL/gVS). This finding demonstrates that the dosing strategy of P nZVI in D facilitated effective interaction among organic matter, microbial communities, and nZVI, resulting in organics removal efficiencies of 67.42 % (total solid) and 77.22 % (volatile solid). Moreover, microbial community analysis supported the efficacy of the P nZVI in D strategy, revealing the enrichment of Clostridium sensu stricto 1 (46.91 %), which potentially engaged in interspecies electron transport (Interspecies hydrogen transfer (IHT) and direct interspecies electron transfer (DIET)) with Methanobacterium (81.19 %) and Methanosarcina (17.11 %). These interactions contribute to enhanced methane yield and stability maintenance in the HSAD system with percolate recirculation. The findings of this study demonstrate that the implementation of HSAD of FS and FW, coupled with percolate recirculation and the addition of nZVI, holds promise for enabling sustainable sanitation practices in developing regions. Moreover, this approach not only facilitates resource recovery but also eliminates the requirement for water.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yuhui Liu,Yonggao Chen,Xiangzhu Liu,Sitong Chen,Tao Bo,Chao Chen,Yingcai Wang,Hao Jiang,Xiaoyan Li,Shuang Zhang
The reduction and removal of uranyl ions (UO 2 2+ ) using highly active zero–valent iron (Fe⁰) are crucial for efficient uranium capture in environmental and nuclear waste management. However, the reported utilization efficiency of Fe⁰ for uranyl reduction remains limited due to surface passivation and inadequate electron transfer. Herein, we demonstrate an advanced approach by introducing boric acid to reconstruct the surface charge on oxygen–rich Fe⁰, effectively repelling oxygen adsorption and enhancing uranium capture efficiency. Combining theoretical calculations with modern characterization techniques, the interaction process between UO 2 2+ and surface boric acid–modified Fe⁰ was studied. Surface modification with boric acid can alter the isoelectric point of Fe⁰, increasing the adsorption of U(VI). Additionally, the empty p orbitals of boron can promote delocalization of electron clouds around shell iron atoms and oxygen atoms, thereby facilitating the outward transfer of electrons from the iron core within Fe⁰ and enhancing the reduction of U(VI). Furthermore, the surface boric acidification of Fe⁰ can enhance the removal of U(VI) through improved adsorption and reduction pathways. Density functional theory calculations revealed that the interfacial electron transfer pathway provided by surface boric acid enhances the reduction capability and inhibits the adsorption of oxygen molecules. This effect reduces the ineffective consumption of Fe⁰ electrons and increases the proportion of U(IV) in the products. This charge redistribution effectively prevents surface passivation while promoting stronger interaction with uranyl ions.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Haowen Zou,Wenqiang Xu,Shuaixuan Ying,Shichao Cai,Bo Chen,Ping Wang,Zhongkuan Wu,Feng He
Mechanochemically sulfidated microscale zero valent iron (S-mZVI bm ) exhibits promising Cr(VI) removal performance but is prone to be passivated by Cr(VI), how to mitigate the passivation is still a challenge. In this study, we successfully synthesized phthalic acid (PA, carboxyl-rich organic acid) modified S-mZVI bm particles (PA-S-mZVI bm (4:1)) through ball milling. The pre-corrosion of the ZVI surface by PA effectively increased the specific surface area of ZVI. Additionally, the carboxyl groups complexed with Cr(VI), thereby enhancing its Cr(VI) removal capacity and alleviating the passivation. The Cr(VI) removal by PA-S-mZVI bm (4:1) was mainly a chemisorption process on the surface and its Cr(VI) removal capacity (55.47 mg/g) was 1.26 and 9.94 – 14.83 times that of PA-mZVI bm and S-mZVI bm , respectively. The electron efficiency of Cr(VI) removal by both PA-S-mZVI bm (4:1) and S-mZVI bm was ∼100 %, however, the Fe(0) utilization efficiency of PA-S-mZVI bm (4:1) was at least 15 times higher than that of S-mZVI bm , explaining the superior performance of PA-S-mZVI bm (4:1). This study confirmed that PA modification could effectively mitigate the passivation and improve the Fe(0) utilization efficiency of S-mZVI bm .
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TALANTA
·
2012
·
IF 3.794
Lin Fan,Xiu-Ping Yan
Isostructural metal–organic frameworks (MOFs) MIL-100(Fe) and MIL-100(Cr), which have identical organic linker and Mobil Thirty-Nine zeolitic type, but different metal ions , were exploited as stationary phases for capillary gas chromatographic separation of alkane isomers. MIL-100(Fe) coated capillary column showed great capability and high efficiency for the gas chromatographic separation of alkane isomers without the need of temperature-programming, while MIL-100(Cr) coated capillary column gave poor performance for the separation. The separation performance of MIL-100(Fe) coated capillary column was even better than commercial HP-5MS and GS-GasPro capillary columns. The determined McReynolds constants, adsorption enthalpies and entropies showed that MIL-100(Fe) coated capillary column gave relatively weaker interaction with alkane isomers than MIL-100(Cr) coated capillary column. The relative standard deviations of repeatability for C7 alkane isomers on MIL-100(Fe) coated capillary column were 0.06–0.16%, 1.1–1.5%, 2.8–3.0% and 2.1–2.4% for retention time, half peak width, peak height and peak area, respectively.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Renpeng Du,Zimuran Yimuran,Huayang Cai,Bosen Zhou,Yingying Ning,Wenxiang Ping,Baojiang Jiang,Jingping Ge
The interest in nanocomposite films incorporating edible ingredients and active nanoparticles has surged due to their potential to enhance food quality and prolong shelf-life. This research focused on developing innovative exopolysaccharides (EPS)/potato starch (PS) nanocomposite films integrated with g-C 3 N 4 and AgNO 3 . Extensive analysis was conducted to assess the microstructure, physical attributes and antimicrobial properties of these films. Fourier transform infrared (FT-IR) analysis revealed electrostatic and hydrogen bonding interactions within the film components. X-ray diffraction (XRD) and X-ray photoelectron spectrometer (XPS) data indicated a high level of compatibility among EPS, PS, g-C 3 N 4 , and AgNO 3 , with no new absorption peaks or characteristic signals of C 3 N 4 and Ag appearing in the nanocomposite films patterns. The thickness, water solubility and water vapor permeability (WVP) of the EPS-PS-C 3 N 4 -Ag nanocomposite film increased due to the addition of g-C 3 N 4 , reached 0.31 ± 0.03 nm, 36.61 ± 1.76 % and 1.42 ± 0.34 × 10 −10 g −1 s −1 Pa −1 , respectively. While transparency, swelling degree, and oxygen permeability (OP) significantly decreased, reached 26.18 ± 2.38 %, 63.01 ± 2.51 % and 41.98 ± 1.28 %, respectively. Scanning electron microscopy (SEM) and atomic force microscope (AFM) images depicted an augmented roughness and porosity on the film surface upon integration of g-C 3 N 4 and AgNO 3 . Moreover, the EPS-PS-C 3 N 4 -Ag nanocomposite film displayed enhanced mechanical strength due to the presence of g-C 3 N 4 . The melting temperature (Tm) of EPS-PS-C 3 N 4 -Ag nanocomposite film was 313.3 °C, the removal rates of DPPH and ABTS was 66.11 ± 2.87 % and 45.09 ± 1.23 % respectively. Significant inhibition of microbial growth was observed in film containing g-C 3 N 4 and AgNO 3 , which demonstrated no toxicity towards NIH-33 cells, suggesting their potential application as promising active packaging material for food preservation.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Xuan Zhang,Siyu Xu,Yawei Gu,Ling Zhang,Longquan Zhang,Fengxu Shang,Xinze Song,Zhen Wang,Xiaoguo Shi,Honglei Zhang,Runze Bi,Jinbo Chen
Zero-valent iron (ZVI) technology has become prevalent for the in situ dechlorination of trichloroethylene (TCE) widely found in soils and groundwater. Nevertheless, ZVI technology still encounters several severe bottlenecks, including inadequate reactivity, poor selectivity, and unelucidated mechanism. Herein, we report that a C&S-mZVI bm material, with the Co-incorporation of C and S into Zero-Valent Iron, could significantly improve the degradation efficiency of ZVI, while simultaneously inhibiting the hydrogen evolution reaction (HER), thereby enhancing the electron selectivity in the TCE dechlorination. Comprehensive characterization techniques have demonstrated that the Co-incorporation of C and S into ZVI leads to better TCE affinity, faster electron transfer and lower charge-transfer resistances. In addition, novel FeS x and Fe 3 C species emerged as new active sites, resulting in two distinct reaction pathways. Specifically, when the C weight percentage is below 2 %, the cumulative quantity of hydrocarbon products surpasses that of DCE, indicating the dominant β-elimination pathway. Conversely, when the weight percentage of C exceeds 2 %, the overall hydrocarbon products fall short of DCE, suggesting that the TCE hydrogenolysis dechlorination reaction becomes the primary pathway. These insights can benefit not only the development of ZVI-based materials but also enhance the broad application of these materials in remediation of groundwater with chlorinated hydrocarbons.
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ADVANCED MATERIALS
·
2024
·Vol. 36
·期 39
·2404772
·
IF 27.4
Ning Sun,Zhichuan Zheng,Zhuangzhuang Lai,Junjie Wang,Peng Du,Tianping Ying,Haifeng Wang,Jianchun Xu,Runze Yu,Zhiwei Hu,Chih-Wen Pao,Wei-Hsiang Huang,Ke Bi,Ming Lei,Kai Huang
While high-entropy alloys, high-entropy oxides, and high-entropy hydroxides, are advanced as a novel frontier in electrocatalytic oxygen evolution, their inherent activity deficiency poses a major challenge. To achieve the unlimited goal to tailor the structure–activity relationship in multicomponent systems, entropy-driven composition engineering presents substantial potential, by fabricating high-entropy anion-regulated transition metal compounds as sophisticated oxygen evolution reaction electrocatalysts. Herein, a versatile 2D high-entropy metal phosphorus trisulfide is developed as a promising and adjustable platform. Leveraging the multiple electron couplings and d–p orbital hybridizations induced by the cocktail effect, the exceptional oxygen evolution catalytic activity is disclosed upon van der Waals material (MnFeCoNiZn)PS 3 , exhibiting an impressively low overpotential of 240 mV at a current density of 10 mA cm −2 , a minimal Tafel slope of 32 mV dec −1 , and negligible degradation under varying current densities for over 96 h. Density functional theory calculations further offer insights into the correlation between orbital hybridization and catalytic performance within high-entropy systems, underscoring the contribution of active phosphorus centers on the substrate to performance enhancements. Moreover, by achieving electron redistribution to optimize the electron coordination environment, this work presents an effective strategy for advanced catalysts in energy-related applications.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-12
·
IF 4.259
Pan Fei,Zhong Xiaohan,Xia Dongsheng,Yin Xianze,Li Fan,Zhao Dongye,Ji Haodong,Liu Wen
This study investigated the efficiency of nanoscale zero-valent iron combined with persulfate (NZVI/PS) for enhanced degradation of brilliant red X-3B in an upflow anaerobic sludge blanket (UASB) reactor, and examined the effects of NZVI/PS on anaerobic microbial communities during the treatment process. The addition of NZVI (0.5 g/L) greatly enhanced the decolourization rate of X-3B from 63.8% to 98.4%. The Biolog EcoPlate TM technique was utilized to examine microbial metabolism in the reactor, and the Illumina MiSeq high-throughput sequencing revealed 22 phyla and 88 genera of the bacteria. The largest genera ( Lactococcus ) decreased from 33.03% to 7.94%, while the Akkermansia genera increased from 1.69% to 20.23% according to the abundance in the presence of 0.2 g/L NZVI during the biological treatment process. Meanwhile, three strains were isolated from the sludge in the UASB reactors and identified by 16 S rRNA analysis. The distribution of three strains was consistent with the results from the Illumina MiSeq high throughput sequencing. The X-ray photoelectron spectroscopy results indicated that Fe(0) was transformed into Fe(II)/Fe(III) during the treatment process, which are beneficial for the microorganism growth, and thus promoting their metabolic processes and microbial community.
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BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Yigang Chen,Fang Wang,Yingjie Jia,Nan Yang,Xianming Zhang
Catalytic depolymerization of lignin for preparation of aromatic hydrocarbons without external hydrogen was first carried out over nano-SiC catalyst in supercritical ethanol. Mixture of the catalyst and lignin was innovatively suspended in a closed reactor and small-molecular aromatic hydrocarbons were successfully achieved at 500 °C. Results revealed that not only did conversion of lignin increase sharply under the nano-SiC catalyst, but also phenols were not detected. The increase of residence time under the Fe-SiC catalyst did not change distribution of the liquid products besides the yield improvement, suggesting that the catalyst was suitable and selective towards formation of small-molecular benzenes, especially C 6 –C 8 benzenes. Preliminary studies found that lignin depolymerization and deoxygenation were successfully fulfilled during the reactions, which provided a very effective route to conversion of lignin into high added-value molecules as transportation fuel additives.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2016
·
IF 2.525
Huanhuan Zhang,Xiaoyu Lan,Peng Bai,Xianghai Guo
Six water-tolerable metal-organic frameworks (MIL-101(Cr), MIL-100(Fe), MIL-100(Cr), MIL-53(Cr), MIL-96(Al), and UiO-66) were employed for the adsorptive removal of acetic acid from water. UiO-66 exhibited more potential as an acetic acid adsorbent than other five MOFs. UiO-66 was further investigated in the view of adsorption kinetics, isotherm, thermodynamics, and regeneration of the adsorbent. The analysis of film diffusion and intraparticle diffusion model suggested that larger acetic acid concentrations would cause higher effects of boundary layer, and the adsorption process was multiple steps. The kinetic results show that adsorption of acetic acid on UiO-66 fitted to pseudo-second-order model and was controlled by chemical adsorption. The adsorption isotherm of acetic acid on UiO-66 followed Freundlich isotherm, which indicated the presence of heterogeneous surface on UiO-66. The thermodynamic parameters (Δ G , Δ H and Δ S ) were also calculated, confirming that the adsorption of acetic acid on UiO-66 was spontaneously exothermic and decrease of disorder. The regeneration of UiO-66 was also demonstrated by washing with deionized water and ethanol. The adsorption capacity and XRD of UiO-66 did not change significantly even after three cycles. Therefore, UiO-66 can be a promising adsorbent for adsorptive removal of acetic acid from wastewater.
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BIOLOGICAL TRACE ELEMENT RESEARCH
·
2016
·Vol. 174
·期 1
·85-92
·
IF 1.798
Zhou Sihui,Zhang Caiying,Xiao Qingyang,Zhuang Yu,Gu Xiaolong,Yang Fan,Xing Chenghong,Hu Guoliang,Cao Huabin
Molybdenum (Mo) is an essential trace element for animals and human beings. However, the negative effects on rumen function and distribution of trace elements in tissues induced by excessive Mo have not been well understood. Therefore, the purpose of present study was to investigate the impact of Mo on rumen microbiota, distribution of trace elements in various organs, and hematological parameters of goats. A total of 36 goats were randomly distributed into three groups with equal number and low-Mo and high-Mo groups were orally administered ammonium molybdate at 15 and 45 mg · Mo · kg −1 · BW respectively, while the control group received corresponding quantitative deionized water. The results showed that the total number of ciliate and protozoa protein concentration decreased significantly ( P < 0.01) on days 25 and 50. Concentrations of ammonia nitrogen and bacterial protein were significantly higher ( P < 0.05) in low-Mo group, while they were lower ( P < 0.05) in high-Mo group than the control group on days 25 and 50. In addition, Mo accumulated in serum and all detected tissues. Copper (Cu) and zinc (Zn) contents significantly decreased ( P < 0.05) in hair and serum on days 25 and 50, while Cu contents increased ( P < 0.05) and the change of Zn contents were not obvious ( P > 0.05) in other tissues on days 25 and 50. Besides, there was no obvious variation in iron (Fe) contents during whole experiment period ( P > 0.05). Furthermore, excessive Mo content had no significant effect on red blood cell (RBC) counts and hemoglobin (HGB) concentration ( P > 0.05) on days 25 and 50, while white blood cell (WBC) counts increased significantly ( P < 0.05) on day 50. These results indicated that excessive Mo content could impact the balance of ruminal microorganisms and interfere with the absorption and distribution of Mo and Cu mainly.
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危险品化学品经营许可证（带存储）