Journal of the Taiwan Institute of Chemical Engineers
·
2016
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IF 2.848
Jia-liang Lv,Qing-da An,Wei Zheng,Yuan Fan,Zhi-min Lei,Shang-ru Zhai
There is an interesting yet challenging task to develop a facile procedure for designing multifunctional carbonaceous materials for environmental applications. In this research, multifunctional hierarchical cabbage-like carbonaceous materials (Fe/CCMs-X) have been fabricated via a facile hydrothermal carbonization (HTC) of furfural in the presence of cobalt acetylacetonate, followed by simple impregnation iron salts and heating treatment. The structure, morphology and magnetic properties were characterized by powder X-ray diffraction (XRD), N 2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM) techniques; and its adsorption behaviors of Cr(VI) were investigated in detail. Batch experiments were conducted at relatively mild conditions (pH ∼ 3). The adsorption equilibrium data was best fitted by Langmuir isotherm model and the adsorption kinetics followed pseudo-second-order models. The maximum capacity predicted by the Langmuir model is 75.3 mg/g for Fe/CCMs-800. Furthermore, thermodynamic parameters (Δ H > 0, Δ S > 0, and Δ G < 0) revealed that the sorption reaction was a spontaneous and endothermic process. Most of important, the excellent magnetism (79.9 emu g −1 ) provided an ideal magnetic-separation performance from aqueous systems. It demonstrated that this newly prepared multifunctional hierarchical carbonaceous materials (Fe/CCMs-X) are promising sorbents for chromium(VI) ions removal from water.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Yaqin Song,Ting Jiang,Jiayu Wu,Jianqiu Chen,Qiong Du
Dissolved silicate (Si), which is omnipresent in natural water and wastewater, is a key factor mediating the separation and transformation of contaminants by forming complexes on the surface of zero-valent iron (ZVI) and iron oxides. In this study, we prepared an nZVI@D201 nanocomposite and studied the redistribution of sulfamethoxazole (SMX) on nZVI@D201 in the pre-equilibration and Si-SMX simultaneous addition systems with 0.1 mM and 1.0 mM Si at an initial pH of 3.0–11.0. The results revealed that both Si pre-equilibration and Si-SMX simultaneous addition exhibited excellent SMX removal efficiency. Si pre-equilibration altered the adsorbed SMX to degradative SMX at an initial pH of 5.0–9.0. Moreover, the simultaneous Si addition at increasing concentrations decreased the degradative SMX. X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy were used to characterize nZVI@D201 after pre-equilibration and simultaneous addition of Si and SMX at an initial pH of 5.0. The results showed that Si pre-equilibration inhibited the transformation of ZVI to magnetite and decreased the crystallinity of the minerals. In addition, the simultaneous addition of Si and SMX impeded the transformation of nZVI to magnetite, whereas the formation of Fe-O-Si complexes hindered the crystallinity. Moreover, scavenger experiments and electron spin resonance tests proved that addition of Si didn’t change the reactive species formation and ·OH was the mainly species for SMX degradation. Based on the detected intermediates via ultra-high performance liquid chromatography-mass spectra, the possible degradation pathways of SMX were proposed.
研究领域:
环境科学
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化学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Ying Liu,Jingfeng Gao,Yuwei Wang,Wanjun Duan,Yi Zhang,Haoran Zhang,Mingyan Zhao
Antibiotic resistance genes (ARGs) and antibiotic resistant bacteria (ARB) are widespread in urban wastewater treatment plants (UWTPs). In this research, a horizontal transfer model of recipient ( Pseudomonas . HLS-6) and donor ( Escherichia coli DH5α carries RP4 plasmid) was constructed to explore the effect of sulfidated nanoscale zerovalent iron (S-nZVI) on the efficiency of plasmid-mediated horizontal transfer. When the S/Fe was 0.1, the inactivation efficiency of 1120 mg/L S-nZVI on the donor and recipient bacteria were 2.36 ± 0.03 log and 3.50 ± 0.17 log after 30 min, respectively (initial ARB concentration ≈ 5 ×10 7 CFU/mL). Effects of treatment time, S/Fe molar ratio, S-nZVI dosage and initial bacterial concentration were systemically studied. S-nZVI treatment could increase the extracellular alkaline phosphatase and malondialdehyde content of the ARB, cause oxidative stress in the bacteria, destroy the cell structure and damage the intracellular DNA. This study provided evidence and insights into possible underlying mechanisms for reducing conjugative transfer, such as hindering cell membrane repair, inducing the overproduction of reactive oxygen species , inhibiting the SOS response, reducing the expression of ARGs and related transfer genes. S-nZVI could inhibit the gene conjugative transfer while inactivating the ARB. The findings provided an alternative method for controlling antibiotic resistance.
研究领域:
环境科学
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微生物学
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水处理
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 10
·7483-7502
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IF 3.442
Wu Minrong,Ma Yongwen,Wan Jinquan,Wang Yan,Guan Zeyu,Yan Zhicheng
The nZVI@mesoSiO 2 nanocomposites with ordered mesoporous structure were successfully prepared through a novel two-step method. Influences of the different conditions on the physicochemical properties and catalytic behavior were investigated. Degradation of 2,4,6-trichlorophenol (2,4,6-TCP) under different conditions was evaluated, and the possible activation mechanism was speculated. The results indicate that only the definite increase in the molar ratio of CTAB/NaOH (cetyltrimethylammonium bromide/sodium hydroxide) helps to obtain the higher specific surface area and narrower pore size distribution of the nZVI@mesoSiO 2 . The thickness of this silica coating could be easily regulated by changing the dosage of the TEOS (tetraethylorthosilicate) precursor. High dosage of the TEOS (larger than 5 mL) leads to the formation of core-free silica particles and low catalytic activity, while nZVI@mesoSiO 2 cannot fully develop at a low dosage (2.5 mL). By controlling different extraction conditions, the nanoscale zero-valent iron core (nZVI) in the composite can be well preserved and corrosion resistant in the whole synthesis process. In this case, the as-prepared nanocomposites offer a high surface area of 638.78 m 2 g −1 as well as a large accessible pore volume of 0.49 cm 3 g −1 for the degradation, which contributing to a fast and efficient degradation of 2,4,6-TCP from aqueous solutions at an appropriate pH (pH 5.0). Moreover, the reusability investigation indicated that the nZVI cores will be inactivated and the pore will be blocked after repeated cyclic reactions. This comprehensive information provides not only a great understanding of the regulation mechanism of core–shell mesoporous nanocomposites, but also a further useful modification of the composites with high selectivity for 2,4,6-TCP.
研究领域:
环境科学
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材料科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2014
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IF 4.058
Wei Wang,Shaolin Li,Hong Lei,Bingcai Pan,Wei-xian Zhang
Applications of nanoscale zero-valent iron (nZVI) in wastewater treatment demand fast and complete separation of nZVI for its reuse and to ensure high-quality effluent. Gravity settling is a promising candidate for nZVI separation due to its low capital and operational cost. Herein, we report polyacrylamide-enhanced separation of nZVI under quiescent and dynamic conditions. A considerable fraction (20–60 mg/L) of bare nZVI remained in supernatant as stable colloids, even with extended settling time of 3 h and very low overflow rate (0.1 m 3 /m 2 h). The addition of low dose PAM (⩽10 mg/g-nZVI) increased the settling efficiency of nZVI by nearly 5 times and improved the effluent quality as well. The colloidal iron in the supernatant was reduced to less than 5 mg/L; the mean hydrodynamic size of nZVI increased by nearly 60 times, from 7.6 μm to 474 μm, as measured by optical microscope and particle size analyzer. Low dosage (⩽10 mg-PAM/g-nZVI) of PAM reduced the surface charge (zeta potential) of nZVI while overdosing PAM (⩾50 mg-PAM/g-nZVI) may recharge and re-stabilize the iron nanoparticles. No inhibition effect of PAM on nZVI reactivity was observed, likely due to its low surface coverage. The study demonstrates a reliable and cost-effective solution for nZVI separation and also proves that nZVI is fully compatible with conventional wastewater treatment processes.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
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2018
·Vol. 229
·期 11
·1-10
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IF 1.769
Yang Lizhe,Gao Jie,Liu Yingying,Zhang Zijun,Zou Motong,Liao Qianjiahua,Shang Jingge
A biochar-supported FeS/nZVI hybrid material (S-nZVI/BC) was synthesized and used for methyl orange (MO) removal from aqueous solutions. The effects of the S/Fe ratio, initial pH, MO concentrations, contact time, and coexisting ions were investigated. S-nZVI/BC was characterized by X-ray diffraction, transmission electron microscopy, vibrating sample magnetometer, BET surface areas, and X-ray photoelectron spectroscopy. A 1.44-fold increase in MO removal rate (from 36.84 to 53.13%) was observed as the S/Fe molar ratio increased from 0 to 0.5. The removal of MO was highly pH-dependent and the adsorption kinetics data were in agreement with the pseudo-second-order model. The maximum removal rate of MO (0.5 mM) was 76.09% (1.902 ± 0.229 mmol/g) for S-nZVI/BC at pH 2.5. The presence of Cl − , Ca 2+ , NH 4 + , and humic acid exerted an inhibitory effect on MO removal, both at low and high concentrations. These results indicate that the sulfidation process would improve the wastewater treatment efficiency. Another benefit is that S-nZVI/BC could be removed from the solution easily by an external magnetic field.
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研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2013
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IF 3.925
Jiacheng Yang,Xiangyu Wang,Minping Zhu,Huiling Liu,Jun Ma
For the first time, the removal process of metronidazole (MNZ) from aqueous solutions over nano zerovalent iron (NZVI) encapsulated within poly(acrylic acid) (PAA)/poly(vinylidene fluoride) (PVDF) membranes was reported. The resultant composite (PPN) demonstrated high reactivity, excellent stability and reusability over the reaction course. Such excellent performance might be attributed to the presence of the charged carboxyl groups in PVDF membrane support, which could enhance NZVI dispersion and improve its longevity. Results showed that a lower initial concentration and higher reaction temperature facilitated the removal of MNZ by PPN, and that the acidic and neutral conditions generally exhibited more favorable effect on MNZ removal than the alkaline ones. Kinetics of the MNZ removal by PPN was found to follow a two-parameter pseudo-first-order decay model well, and the activation energy of the MNZ degradation by PPN was determined to be 30.49 kJ/mol. The presence of chloride ions slightly enhanced the reactivity of PPN with MNZ, whereas sulfate ions inhibited its reactivity. In addition, MNZ degradation pathways by PPN were proposed based on the identified intermediates. This study suggests that PPN composite possessing excellent performance may be a promising functional material to pretreat antibiotic wastewaters.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2021
·Vol. 28
·期 47
·67098-67107
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IF 4.223
Long Yingtao,Liang Jianjun,Xue Yinghao
A novel composite (nZVI/Pd-AC) was prepared by loading nanoscale zero-valent iron (nZVI) and Pd on activated carbon (AC) electrode under electrodeposition with ultrasound, which was used to reductive degradation of methylene blue (MB). The loading contents of Fe and Pd in composite materials were 15.84% and 2.06%, respectively. XPS results further confirmed that the as-prepared material contained Fe 0 and Pd 0 . Without external conditions, MB could be degraded in the presence of nZVI/Pd-AC and reached equilibrium within 180 min. To investigate the reusability, the re-electrodeposition strategy was effective to refresh the active sites of nZVI/Pd-AC, and the removal efficiency only reduced by 4.51% in five circles indicating the good reusability of nZVI/Pd-AC composites. GC–MS was used to identify possible degradation pathways of MB; the results showed that the degradation products were mainly N, N-dimethylaniline and 2-amino-5-dimethylamino-benzenesulfonic acid. And the S–C, C–N bonds are the sites easier to be attacked. Graphical abstract
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 47
·期 5
·2536-2547
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IF 3.925
Dengjie Zhong,Wei Gao,Yunlan Xu
Nanoscale zero-valent iron (nZVI) has attracted widespread attention since it can effectively solve the Cr(VI) pollution problem by reducing Cr(VI) to less toxic and less soluble Cr(III). However, nZVI easily agglomerates and oxidizes. In order to solve these problems, resin D201 was selected as the carrier and modified by polydopamine (PDA) to prepare a PDA/nZVI/D201 composite material to treat simulated Cr(VI) wastewater in this work. SEM, TEM, EDX and BET analyses showed that nZVI particles were uniformly dispersed on the surface of D201 and their surfaces were covered with a PDA film. PDA/nZVI/D201 has a mesoporous structure and its specific surface area was 23.57 m2 g−1. XPS analysis showed that Cr(VI) could be adsorbed on the surface by electrostatic action of protonation of the PDA active site and reduced to Cr(III) by nZVI. Some Cr(III) formed a co-precipitate with Fe(III) and attached to the resin, and some Cr(III) chelated with PDA due to its hydrophilicity and abundant amino and hydroxyl groups. Compared with bare nZVI, PDA/nZVI/D201 significantly improved the removal efficiency of 100 mg L−1 Cr(VI) by 61.1%. The adsorption of Cr(VI) on the PDA/nZVI/D201 composite well followed Langmuir adsorption isotherms and the maximum adsorption capacity reached 184.9 mg g−1. The results show that PDA-modified resin loaded nZVI is a promising method for in situ heavy metal contaminated groundwater remediation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
WATER RESEARCH
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2022
·
IF 13.4
Shuangjie Xiao,Zilan Jin,Haoran Dong,Junyang Xiao,Yangju Li,Long Li,Rui Li,Jie Chen,Ran Tian,Qianqian Xie
There are plentiful ways to synthesize sulfidized nanoscale zerovalent iron (S-nZVI), and this study investigated the influence of sulfur reagents (Na 2 S, Na 2 S 2 O 3 , Na 2 S 2 O 4 ) and sulfidation sequence (co-sulfidation and post-sulfidation method) on the physicochemical properties, reactivity, and long-term performance of S-nZVI in simulated groundwater. The results suggested that the co-sulfidized nZVI (S-nZVI co ) has higher reactivity (∼2-fold) than S-nZVI post due to the stronger electron transfer capacity, deriving from the higher content of Fe 0 and reductive sulfur species. However, during aging, the reactivity of S-nZVI co would be lost more rapidly than S-nZVI post , due to the faster corrosion of Fe 0 and more oxidation of reductive sulfur species. S-nZVI post has the superior long-term performance with the degradation rate of trichloroethylene (TCE) remained at 30%∼60% even after 90 d of aging. Sulfur precursors can control the selectivity of S-nZVI by affecting the sulfur speciation on the particle surface. The proportion of reductive sulfur species on S-nZVI post synthesized by Na 2 S was higher than S-nZVI post synthesized by Na 2 S 2 O 3 or Na 2 S 2 O 4 , resulting in a higher selectivity of the former S-nZVI post than the latter S-nZVI post . In addition, sulfidation procedures and sulfur precursors did not affect the degradation pathway of TCE. Nevertheless, the degradation product distribution can be affected by the different physicochemical transformation of various types of S-nZVI with the aging time. These results indicated that sulfur reagents and sulfidation procedures have crucial effects on the reactivity and long-term performance of S-nZVI, which can be designed for the specific application scenarios.
研究领域:
环境科学
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化学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
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2022
·
IF 6.137
Hongyu Liu,Meng Hu,Huan Zhang,Junfu Wei
Stalk Biochar (SBC) and Nanoscale zero-valent iron (nZVI) was coupled using biosynthesis method to form SBC-nZVI composite material. The couple of SBC and nZVI exhibits synergistic effect on improving catalytic activity for PS to get rid of dyes. The groups such as –OH and –COOH on the SBC can activate PS and nZVI has a better catalytic activity than SBC. SBC can enhance the dispersibility of nZV and protect it from oxidation to improve catalytic activity for PS and enhance electron conduct and transfer efficiency. Several important influencing factors on removal rate such as C: Fe mass ratio and inorganic anions were discussed in detail. Free radical quenching and electron spin resonance (ESR) analysis experiment confirm that superoxide radicals (O 2 ·− ) and hydroxyl radicals (·OH) played a role in the removal of contaminants but they were not the main radicals. Instead, sulfate radicals (SO 4 ·− ) was the main radical species in removal of contaminants. The SBC-nZVI composite material shows a good reusability, stability for store, and applicability for different type of dyes.
研究领域:
环境科学
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催化材料
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Yabin Zhang,Zijun Liu,Mingmin Bao,Yuyu Gao,Yipeng Jia,Jiawei Wang,Wenying Li,Jingwen Wu,Haiqing Qiu,Lixuan Ma,Yanxia Guo
Arsenic contamination in water poses a severe threat to the environment and human health. Developing a green, low-cost, and highly efficient adsorbent for As(III)/As( V ) removal remains a great challenge. In this work, titanate nanotube-encapsulated nZVI (Fe@TNTs) and surface-supported nZVI (Fe/TNTs) were prepared. The confinement effect on arsenic adsorption was systematically investigated. A series of characterizations (TEM, XRD, XPS, etc.) and analyses (batch experiments, MD/DFT calculations) were conducted. Fe@TNTs exhibit superior adsorption capacities versus Fe/TNTs, along with excellent coexisting ion tolerance (excluding PO 4 3− ) and cyclic stability. As(III) is adsorbed via monolayer chemisorption, whereas As( V ) adsorption exhibits a heterogeneous surface adsorption behavior. MD simulations confirm confinement-induced arsenic enrichment in Fe@TNTs, and DFT calculations verify its lower arsenic adsorption energies. These advantages stem from confinement effect, which induces arsenic enrichment and promotes complexation, oxidation, and electrostatic interactions. This study provides a novel confinement engineering strategy for high-performance adsorbents, with great application potential in the treatment of arsenic-contaminated wastewater.
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DOI
高影响因子
危险品化学品经营许可证（带存储）