BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Jingyang Luo,Ying Zhu,Qin Zhang,Miao Cao,Wen Guo,Han Li,Yang Wu,Hui Wang,Yinglong Su,Jiashun Cao
This study explored the influences of peroxydisulfate (PDS) and peroxymonosulfate (PMS) activated with different catalysts on the anaerobic fermentation of waste activated sludge (WAS). All the treatments were effective in promoting short-chain fatty acids (SCFAs) production, particularly acetic acid, in the order of PMS/MnO 2 > PMS/Zn > PDS/Zn > PMS/Fe > PDS/Fe > PDS/MnO 2 . Mechanistic investigations demonstrated that WAS disintegration was intensely induced by the free radicals ( i.e., SO 4 − and OH) generated in PDS and PMS treating reactors. It significantly promoted the solubilization and hydrolysis processes and thereby provided sufficient bioavailable substrates for further acidogenic metabolisms. Additionally, it enlarged the abundance of functional bacteria responsible for SCFAs production. The simultaneous promotion of bioavailable substrates and fermentative microorganisms markedly contributed to the SCFAs enhancement. Moreover, the dewaterability and stabilization of fermented sludge were both improved with the PDS and PMS treatments, which were beneficial to the final disposal of WAS.
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高影响因子
Biochar
·
2019
·Vol. 1
·期 2
·203-212
·
IF 0
Qiao Jiangtao,Yu Huanyun,Wang Xiangqin,Li Fangbai,Wang Qi,Yuan Yuzhen,Liu Chuanping
In paddy fields, the opposing transformation of arsenic (As) and cadmium (Cd) poses many challenges for their simultaneous remediation. In our previous study, we reported that combined biochar and zero-valent iron (ZVI) amendment had great potential for the simultaneous alleviation of As and Cd bioavailability in contaminated acid paddy soil. In this study, an As- and Cd-contaminated alkaline paddy soil was further studied, and the same ZVI–biochar mixtures amendments were applied to evaluate the impact of the mixtures on As and Cd transformation and translocation in the soil–rice system by performing pot experiments with rice. In line with our previous study, the ZVI–biochar composites significantly reduced As and Cd accumulation in different rice tissues, leading to a 42% and 47% decrease in rice grain As and Cd levels, respectively, compared with the control values. The ZVI–biochar mixtures exhibited synergistic effects of biochar and ZVI by enhancing the transformation of bioavailable As and Cd fractions into less bioavailable fractions, and by increasing iron plaque formation to reduce As and Cd bioavailability. Although the bioaccumulation and translocation factors of As and Cd in alkaline paddy soil were generally lower than those in acid paddy soil, particularly in the presence of the ZVI–biochar mixtures, the grain As and Cd levels did not achieve the desired food safety standard levels, probably related to the high soil As content and the small changes in soil pH. Nevertheless, for treating lightly and moderately contaminated paddy soils, ZVI–biochar mixtures can still be a good choice in the future.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Bo Yang,Peng Zhou,Xin Cheng,Haishen Li,Xiaowei Huo,Yongli Zhang
This study aimed to investigate the simultaneous removal of methylene blue (MB) and total dissolved copper (TCu) by heterogeneous zero-valent iron (ZVI) Fenton-like system (ZVI/H 2 O 2 ) and elucidate the mechanism of synergistic effect for co-contaminants removal. Hydroxyl radical ( OH) formation was hypothesized to be the dominant pathway for the oxidation of MB, confirmed by the quenching experiments and ESR analysis. And the synergistic effect of TCu and ZVI greatly promoted the release of Fe 2+ , further accelerating the generation of hydroxyl radical ( OH) via Fenton reaction. The generation process of OH was unveiled by quenching experiments and electron spin resonance (ESR) analysis, while the processes of ZVI corrosion and TCu reduction were revealed through several characterization approaches including SEM , XRD , FTIR and XPS . The degradation pathway of MB was also investigated by LC-MS analysis. The MB initial concentration, TCu initial concentration, H 2 O 2 dosage, ZVI dosage and initial solution pH could play crucial roles in the removal of MB and TCu. The influence of water matrix including inorganic anions (Cl − , NO 3 − , HCO 3 − ) and actual water was finally conducted to elucidate the role of natural organic matter (NOM) in the environmental systems.
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JOURNAL OF HAZARDOUS MATERIALS
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2018
·
IF 6.434
Ailin Li,Zihao Wu,Tingting Wang,Shaodong Hou,Bangjie Huang,Xiujuan Kong,Xuchun Li,Yinghong Guan,Rongliang Qiu,Jingyun Fang
The abatement of pharmaceuticals and personal care products (PPCPs), including carbamazepine (CBZ), acetaminophen (ACP) and sulfamethoxazole (SMX), by zero-valent iron (Fe°) activated peroxydisulfate (PDS) system (Fe°/PDS) in pure water and groundwater was investigated. The removal rates of CBZ, ACP and SMX were 85.4%, 100% and 73.1%, respectively, within 10 min by Fe°/PDS in pure water. SO 4 •− , • OH and O 2 •− were identified in the Fe°/PDS system, and O 2 •− was indicated to play an important role in the ACP degradation. The degradation of PPCPs increased with increasing dosages of Fe° and PDS or with decreasing pH and initial PPCP concentrations. Interestingly, the degradation of PPCPs by Fe°/PDS was significantly enhanced in groundwater compared with that in pure water, which was partially attributed to SO 4 2− and Cl − . The first-order constants of CBZ, ACP and SMX increased from 0.021, 0.242 and 0.013 min− 1 to 0.239, 2.536 and 0.259 min −1 , and to 0.172, 1.516 and 0.197 min −1 , respectively, with increasing the concentrations of SO 4 2− and Cl − to 100 mg/L and 10 mg/L, respectively. This study firstly reports the unexpected enhancement of groundwater matrix on the degradation of micropollutants by Fe°/PDS, demonstrating that Fe°/PDS can be an efficient technology for groundwater remediation.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
IF 6.653
Juntao Tang,Jianlong Wang
A novel Fenton-like catalyst, metal organic framework MIL-100(Fe) with FeII/FeIII mixed-valence coordinatively unsaturated iron center (CUS-MIL-100(Fe)), was synthesized, characterized, and used for the degradation of sulfamethazine (SMT). The catalytic performance of CUS-MIL-100(Fe) was investigated on the basis of various parameters, including initial pH, H2O2 concentration, catalyst dosage, and initial SMT concentration. The results showed that CUS-MIL-100(Fe) could effectively degrade SMT, with almost 100% removal efficiency within 180 min (52.4% mineralization efficiency), under the reaction conditions of pH 4.0, 20 mg L–1 SMT, 6 mM H2O2, and 0.5 g L–1 catalyst. Moreover, CUS-MIL-100(Fe) displayed a higher catalytic activity than that of MIL-100(Fe) for SMT degradation. Combined with the physical–chemical characterization, the enhanced catalytic activity can be ascribed to the incorporation of FeII and FeIII CUSs (coordinatively unsaturated metal sites), the large specific surface area, as well as the formation of mesopores. Furthermore, CUS-MIL-100(Fe) exhibited a good stability and reusability. The possible catalytic mechanism of CUS-MIL-100(Fe) was tentatively proposed.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ying Lü,Zhanfeng Li,Jianfa Li,Kun Chen,Huaping Dong,Jianxin Shou,Yimin Li
In this work, a novel combination of pyrite with zero valent iron (ZVI) was used to enhance the efficiency of Cr(VI) removal in column experiments, simulating the operation of permeable reactive barriers (PRBs).The influence of pyrite dosage, initial pH, and the mixing manner on the removal efficiency were evaluated. The synergetic effect between pyrite and ZVI was found to contribute to enhanced Cr(VI) removal in column experiments using the ZVI/pyrite mixture, by which the Cr(VI) removal could be kept at >90% for 50–100 PVs in comparison with ∼30 PVs by using ZVI alone.The Cr(VI) removal efficiency by the ZVI/pyrite mixture was also much higher than the sum of those by ZVI and pyrite separately in the batch experiments. Mechanism investigations indicated that the synergetic effect was principally attributed to the more reactive Fe 2+ regenerated in the columns using the ZVI/pyrite mixture, due to reaction of pyrite with Fe 3+ produced during Cr(VI) reduction. In addition, pyrite could suppress the pH increase and retard the surface passivation of active materials. The by-product SO 4 2− from pyrite oxidation is also beneficial for enhanced removal efficiency. X-ray photoelectron spectroscopy (XPS) and Scanning electron microscopy-Energy dispersive spectrometry (SEM-EDS) studies confirmed the reduction of Cr(VI) into Cr(III), and that more pyrite was consumed in the Cr(VI) reduction by the ZVI/pyrite mixture. These findings are useful for developing cost-efficient methods for enhancing the removal of pollutants by ZVI-PRBs.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2018
·
IF 3.046
Xiaoshan Yang,Xiufang Cui,Guo Jin,Jinna Liu,Yanbo Chen,Zhe Liu
Laser additive manufacturing (LAM) is a novel method for processing compositionally graded alloys and becomes increasingly important in the context of next-generation manufacturing technology. In this work, (Fe 60 Co 35 Ni 5 ) 78 Si 6 B 12 Cu 1 Mo 3 soft magnetic alloys with different laser power were designed and processed by the LAM. The magnitudes of magnetic properties were analyzed, and the relationships among composition-microstructure-magnetic properties assessed. Results show that the (Fe 60 Co 35 Ni 5 ) 78 Si 6 B 12 Cu 1 Mo 3 alloys by LAM exhibits relative uniform microstructure and comparable magnetic property compared with those conventional processed alloys. The bcc dominated microstructures exhibit a substantially higher saturation magnetization (Ms). With the increase in power, the average grain size of the alloy increased slightly and the increasing volume fraction of the Fe Si phase leaded to the enhancement of magnetization. The (Fe 60 Co 35 Ni 5 ) 78 Si 6 B 12 Cu 1 Mo 3 alloys with laser power of 3000 W exhibits the highest Ms (199 emu/g). The appearance of Fe 3 B results in coarse dendrites and high coercivity (Hc) in the multiple re-heating cycles.
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高影响因子
FUEL
·
2018
·
IF 4.908
Jing Sun,Yican Wang,Wenlong Wang,Ke Wang,Jiaxin Lu
Carbon-encapsulated iron nanoparticles (Fe@CNPs) with a high degree of graphitization, good integrity in the graphite shells, and high microwave-absorbing capability were prepared by first dissolving ferrocene into organic solvent and then being carbonized by MW-metal discharges under inert atmosphere. Four different organic solvents (benzene, cyclohexane, paraffin, and anhydrous ethanol) were tested, and well-graphitized Fe@CNPs were formed when using benzene or cyclohexane as the solvent. The use of MW-metal discharges with low-toxic cyclohexane and ferrocene as raw materials provides a new method for the preparation of Fe@CNPs with the merits of simplicity, low environmental impact, and high efficiency. The fabricated Fe@CNPs have excellent microwave-absorbing capability, which is respectively 29, 19.3, and 9.7 times those of carbonyl iron powder, SiC, and carbon nanotubes after 1-min microwave irradiation at 1000 W. The thermal gravimetric analysis demonstrates that the fabricated Fe@CNPs have good thermal stability. Owing to these properties, Fe@CNPs have the potential to shape nanoscale or micron scale high-energy sites for a vast variety of applications in the field of microwave chemistry.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Juntao Tang,Jianlong Wang
Fe-based magnetic nanoparticles (NPs) embedded into mesoporous carbon hybrid (Fe@MesoC) was successfully fabricated from Fe-based metal-organic framework (MIL-100(Fe)) through a pyrolysis method, which was for the first time proposed as a novel Fenton-like catalyst for the degradation of sulfamethoxazole (SMX). The catalytic activity of Fe@MesoC was systematically evaluated on the basis of several reaction parameters including initial pH, initial H 2 O 2 concentration and temperature. Under the optimal conditions, the Fe@MesoC composite demonstrated a superior catalytic activity for decomposing SMX in the presence of H 2 O 2 , and it accomplished 100% SMX and 54.5% total organic carbon (TOC) conversion within 120 min. Such outstanding performance can be explained by the excellent enrichment ability of the outer mesoporous carbon matrix, the abundant active sites of the inner Fe-based NPs, as well as the possible synergistic effect between the two components. Moreover, the facile electrons transfer from Fe 0 to iron oxide in the inner Fe-based NPs could facilitate the reduction of Fe 3+ to Fe 2+ ( represents the iron species anchored to the surface of the catalyst) and further improve the generation of hydroxyl radicals. With the high structural stability and saturation magnetization, the Fe@MesoC composite can be easily recycled for three subsequent runs without significant activity loss. The possible catalytic mechanism and degradation pathways for SMX degradation induced by hydroxyl radicals in Fe@MesoC/H 2 O 2 Fenton-like system were also tentatively proposed.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Zhouliangzi Zeng,Jiafei Lyu,Peng Bai,Xianghai Guo
In this work, seven metal–organic frameworks [ZIF-8, MIL-53(Cr), MIL-96(Al), MIL-100(Cr), MIL-100(Fe), MIL-101(Cr), and UiO-66 ] were applied for adsorptive separation of fructose–glucose mixture. UiO-66 exhibited better performance in adsorption capacity and selective adsorption of fructose. The adsorptive process with UiO-66 was further investigated in detail including kinetic, isotherm, and adsorption mechanisms. The rate-determining step analysis based on film diffusion and intraparticle diffusion model suggested that the adsorption process was controlled by multiple steps, which fitted the pseudo-second-order model. The Freundlich model was fitting better than the Langmuir model, which indicated multilayer adsorption on heterogeneous surface. The thermodynamic parameters (ΔG, ΔH, and ΔS) were calculated, indicating that adsorption process on UiO-66 was an endothermic and entropy increment process. UiO-66 can be a promising adsorbent for adsorptive separation of fructose and glucose.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Ying Lü,Jianfa Li,Yimin Li,Liping Liang,Huaping Dong,Kun Chen,Chunxia Yao,Zhanfeng Li,Jinxiang Li,Xiaohong Guan
Zero-valent iron (ZVI) is a popular reductant that has been successfully applied for remediation of groundwater contaminated with various pollutants, but it still suffers from surface passivation and pH increase in the reaction media. In this study, pyrite, a ubiquitous sulfide mineral in anaerobic environment, was adopted to enhance the reactivity of ZVI for removal of nitrobenzene. The synergetic effect between pyrite and ZVI was observed for nitrobenzene reduction, and the rate constant k obs at the initial pH (pH 0 ) 6.0 was enhanced by 8.55–23.1 folds due to the presence of pyrite with pyrite/ZVI mass ratio ranging from 1.0 to 6.0. Moreover, nitrobenzene could be removed effectively at pH 0 ranging from 5.0 to 10.0 in the presence of pyrite, while negligible removal of nitrobenzene by ZVI (0.5 g/L) alone was observed at pH 0 ≥7.0. ZVI sample recovered from the reacted ZVI/pyrite mixture was also more effective for nitrobenzene degradation than pristine ZVI. The mechanism study revealed that pyrite could suppress the pH increase in reaction media, boost the production of reactive Fe 2+ , and activate the ZVI surface through replacing partially the passive oxide film with iron sulfide (FeS). In particular, the formation of highly reactive FeS@Fe in the reaction system of ZVI/pyrite mixture was proved by XRD, Mössbauer, XANES, XPS and SEM-EDS analyses, which provides a facile way for in-situ sulfidation of ZVI and for enhancing the removal of contaminants with ZVI technology.
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RSC Advances
·
2018
·Vol. 8
·期 48
·27181-27190
·
IF 2.936
Yayi Wang,Duanli Wang,Huiying Fang
The feasibility of adding nano-zero valent iron (NZVI: 0.6, 1.0, 4.0, 10.0 g L−1) to enhance anaerobic digestion of waste activated sludge (WAS) was examined by comparison with ZVI, and the mechanisms of NZVI enhancement of the hydrolysis and methanogenesis processes were elucidated. NZVI could enhance hydrolysis–acidification of WAS by destroying the integrity of microbial cells. Both volatile fatty acids production and the acetic acid portion were greatly improved by NZVI additions, peaking at 4.0 g L−1 NZVI. In anaerobic digestion, CH4 production was promoted at a NZVI dosage ≤1.0 g L−1. The optimum dosage of NZVI for methanogenesis was 1.0 g L−1, and further addition of NZVI could cause inhibition of methanogenesis because of long-term accumulation of H2. ZVI could also improve hydrolysis–acidification and the CH4 yield, but its efficiency was relatively low compared with NZVI, and it could not induce cell wall rupture. 16S rDNA high-throughput sequencing results showed that NZVI addition at appropriate dosage facilitated increasing the proportion of microorganisms involved in WAS hydrolysis–acidification and methanogenesis.
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