JOURNAL OF ENVIRONMENTAL QUALITY
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2021
·Vol. 50
·期 5
·1123-1134
·
IF 2.751
Li Liu,Jinxin Zhao,Weizhao Yin,Sihao Lv,Mei Su,Ping Li,Xiangyu Zheng,Penchi Chiang,Jinhua Wu
In this study, a collaborative system of Fe 0 and mixed anaerobic microorganisms was established for remediating chromium (Cr)-contaminated soil and restraining the translocation of Cr from soil to swamp cabbage ( Ipomoea aquatica Forssk.). Solid phase characterization demonstrated that more reactive secondary minerals such as green rust, magnetite, and lepidocrocite were generated in the composite system as compared with the Fe 0 -only system. Hence, the Fe 0 –microorganisms composite system achieved a remarkably higher aqueous Cr(VI) removal of 85.6%, 2.9 times higher than that in the Fe 0 -only system. After 14 d remediation, easily available Cr(VI) and Cr total species such as water-soluble, exchangeable, and bound-to-carbonates were converted to less available Cr(III) and Cr total species (e.g., Fe–Mn oxides-bound and organic matter-bound species) because of the production of Cr–Fe hydroxides and oxides [Cr x Fe 1−x (OH) 3 or Cr x Fe 1−x OOH] on the Fe 0 surface. A pot experiment showed that Cr uptake by swamp cabbage after the composite system remediation was suppressed by 69.1%, two times higher than that after the Fe 0 -only system remediation. Excessive Fe uptake by swamp cabbage also was efficiently inhibited by the composite system treatment due to enhanced Fe hydroxides and oxides production on the Fe 0 surface because of biological corrosion and mineralization. These results indicated that Fe 0 –microorganisms composite system remediation could efficiently enhance Cr(VI) immobilization and decrease its bioavailability and bioaccumulation by plants, which is a promising technology in Cr-contaminated soil remediation.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 40
·2102917
·
IF 18.808
Ruijin Sun,Shifeng Jin,Jun Deng,Munan Hao,Xin Zhong,Yuxin Ma,Mingxing Li,Xiaolong Chen
High pressure has become a powerful platform for creating and controlling novel states of matter, including high temperature ( T c ) superconductivity. However, the emergent phenomena generally disappear as high pressure is removed and cloud prospects for future applications. Here, from a distinguishing perspective, FeSe 1− x S x is reported as 2D van der Waals materials with extraordinary high- T c at ambient pressure, where the superconductivity is boosted by extreme “chemical pressure” inside the materials. Superior to external high pressure, isovalent S substitution in FeSe leads to a much greater compression rate within the superconducting iron-chalcogenide layer, which guarantees an unabridged superconducting dome that peaked at 37.5 K. Density functional theory calculations reveal that the decreased lattice and structural parameters contribute together for the shift of Fe 3d x 2− y 2 orbital, which creates a new hole-pocket at the Fermi level that intimately correlated with the enhanced superconductivity. This study demonstrates the design of materials with optimized superconductivity by introducing chemical pressure.
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WASTE MANAGEMENT
·
2021
·
IF 7.145
Junya Zhang,Tiedong Lu,Hui Zhong,Peihong Shen,Yuansong Wei
It is unadvisable to discuss the antibiotic resistance genes (ARGs) reduction in anaerobic digestion (AD) system neglecting its main purpose-methane production. The methane production improvement coupling with antibiotic resistance genes (ARGs) reduction in anaerobic digestion (AD) by zero valent iron (ZVI) were simultaneously investigated. Whether the role of ZVI on the ARGs fate was random or specific was clarified through the high-throughput qPCR (HT-qPCR). Results indicated that ZVI improved methane production and ARGs reduction by 23.9% and 25.0%, respectively. The improved methane production was associated with chemical reaction and variances of microbial community caused by ZVI, where DIET between Petrimonas , Clostridium and Syntrophomonas , Methanosarcina was established along with ACAS being enriched. ZVI specifically, not randomly, facilitated the reduction of aminoglycoside resistance genes of antibiotic inactivation and tetracycline resistance genes of ribosomal protection proteins. The specifical reduction could be attributed to enzyme activity inhibition and intracellular ionic disturbance caused by higher amounts of ZVI, although most of ARGs fate could be well explained by microbial community which contributed the most to ARGs dynamics as a whole. ZVI-based AD was a promising way for the improvement of methane production coupling ARGs reduction.
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高影响因子
WATER RESEARCH
·
2021
·
IF 11.236
Lin Wang,Tingting Yan,Ruijie Tang,Qian Ping,Yongmei Li,Jie Wang
In this study, nanoscale zero-valent iron (nZVI) was added to motivate the functions of all the reactive oxidation species in peracetic acid (PAA) mixture under ultraviolet (UV) irradiation, and to enhance the removal of spiramycin, which is a typical precursor of N-nitrosodimethylamine (NDMA). Spiramycin (≤ 10 mg/L) could be completely removed within 20 min under the conditions of an initial pH of 4.0, a nZVI dose of 0.02 g/L and a PAA dose of 3.0 mg/L; additionally, 95.8% and 78.8% of PAA and H 2 O 2 were consumed during the process. Electron paramagnetic resonance analysis and quenching experiments confirmed that 52.4% and 44.8% of spiramycin removal was contributed by hydroxyl radical (•OH) and carbon-centered radicals (R-C•), respectively; and Fe 2+ released from nZVI played a critical role in radicals generation. Four degradation pathways of spiramycin were proposed and verified by the density of functional theory analysis. 65.2% of the NDMA formation potential (FP) was reduced after the reaction, and its residual was mainly contributed by the undegraded intermediate of dimethylamine. The results of multiple characterizations and continuous degradation experiments indicated that nZVI was stable in the system as the removal of spiramycin was hardly influenced even if reused three times. The nZVI/UV/PAA process is a promising advanced oxidation technology not only for the removal of refractory NDMA precursors (such as spiramycin) but also for significantly lowering the NDMA FP.
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Energy Storage Materials
·
2019
·
IF 0
Tao Dai,Lie Yang,Xiaohui Ning,Danli Zhang,R. Lakshmi Narayan,Ju Li,Zhiwei Shan
Due to their compactness, storage/supply flexibility, modularity and factory manufacturability, batteries are excellent candidates for large scale energy storage applications . However, the widespread application of most batteries hitherto developed is hindered by their high cost. Here, an intermediate temperature molten salt battery is developed that emphatically resolves this issue by using all earth-abundant and cheap elements. Operated at 170 °C, the cell comprises of an Fe metal anode, NaCl saturated NaAlCl 4 electrolyte and an AlCl 4 − intercalated graphite cathode in the fully charged state. It has a capacity retention of 85% after nearly 10,000 cycles. After characterizing the anode, it was determined that the high reversibility of the Fe to FeCl 2 solid state transformation are responsible for the absence of dendritic growth on such a metal anode. Different electrode capacity matching strategies are discussed in the context of ensuring safe operation during overcharging. Finally, the overall material cost of the Fe/Graphite cell is estimated to be 33.9 $ kWh −1 , which can potentially meet the demands of the commercial energy storage market.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Zhongtang Wang,Zhaoya Huang,Yun Xie,Zhaoyi Tan
Plutonium has been extensively studied in the environment, for the purpose of radiological assessment, environmental behavior study and nuclear emergency response. To determine Pu isotopes in environmental soil and sediment, a novel analytical method was established in this study using a new type of extraction resin, TK200 resin. Firstly an investigation was performed to study the extraction behaviors of Pu, U, Th, Hg, Tl, Pb, Bi and Hf on TK200 resin. On the basis of the results, a new chromatographic procedure was then proposed to separate Pu from the elements that interfere the accurate determination of Pu isotopes by mass spectrometry. Owing to the excellent separation efficiency between Pu and interfering elements (IEs) of the developed procedure, high decontamination factors (DFs) were obtained for IEs, e.g. the DF(U) (>7.5 × 10 7 ) was the highest reported value. The separation procedure was finally combined with HNO 3 leaching, CaF 2 /LaF 3 coprecipitation and sector field-inductively coupled plasma mass spectrometry (SF-ICPMS) measurement to establish a complete method. The established method was evaluated by analyzing four standard reference materials (soil, sediment), and the results showed that both 239+240 Pu activity and 240 Pu/ 239 Pu isotopic ratio were accurately determined, with stable and high Pu chemical recoveries (81–91%). The whole analytical method only took about 15 h, and the limits of detection were calculated to be 0.13–0.24 fg g −1 for Pu isotopes (for 2 g soil or sediment), guaranteeing the rapid determination of ultra-trace level Pu in soil and sediment samples.
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高影响因子
COMBUSTION AND FLAME
·
2019
·
IF 4.12
Long Cheng,Hongtao Yang,Yue Yang,Yifan Li,Yingyi Meng,Yanchun Li,Dongming Song,Houhe Chen,Ramón Artiaga
The application of boron in fuel-rich solid propellant is limited by its long combustion time, ignition delay and low combustion efficiency. To overcome these problems, B/Nitrocellulose (NC)/Fe particles were fabricated by electrospraying. The reactivity and combustion behavior of B/NC/Fe particles were characterized by TG/DSC, oxygen bomb calorimeter and laser ignition. Compared with pure boron, lower oxidation temperature was observed in the thermal analysis of prepared particles. Meanwhile, the prepared particles released more heat and ignite more readily during the combustion. Furthermore, B/NC/Fe particles were added into Hydroxyl-terminated polybutadiene (HTPB)/Ammonium perchlorate (AP) propellants as additives to test their combustion performance. The burning rate of propellants in air and closed bomb were both improved by 8.20% and 117%, respectively. Overall, B/NC/Fe particles not only show the superior reaction performance, but also contribute to the tunable burning rate of propellants.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Rui Wang,Zhixin Zhu,Shufei Tan,Jie Guo,Zhenming Xu
Degradation of brominated flame retardants (BFRs) in waste printed circuit boards (WPCBs) occurred due to mechanical force during the crushing process. In this study, a planetary ball-milling simulation experiment was designed to explore the mechanochemical debromination process of BFRs in WPCBs. The results showed that CaO had a better debromination performance than MgO and the mixture of Fe + SiO 2 , and high revolution speed and low mass ratio of WPCBs to CaO promoted the degradation of BFRs. After milling for 1 h, the particle size distribution was stable while the debromination efficiency increased with the increase of milling time. Ball milling promoted the migration of bromine from the inside to the new surface of WPCBs powder, and submicron particles adhered to the micron size aggregates. The polybrominated diphenyl ethers (PBDEs) detection showed that the concentrations of most PBDE congeners decreased with the increase of milling time, and a possible degradation pathway was proposed according to the experimental results. All the results provided new data for the mechanism of degradation of BFRs in WPCBs during the mechanical crushing process.
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高影响因子
WASTE MANAGEMENT
·
2019
·
IF 5.431
Xiaojun Lai,Xun-an Ning,Yao He,Yiqian Yuan,Jian Sun,Yaowei Ke,Xiaoyuan Man
Understanding the occurrence states of persistent organic pollutants such as polycyclic aromatic hydrocarbons (PAHs) in textile dyeing sludge is the key to their further treatment and disposal. Here, the effects of inorganic salts (silicate, sulfate, phosphate, hydroxide, and iron salts) that were typically rich in textile dyeing sludge on PAH adsorption by sludge and PAH degradation by an ultrasound (US) combined zero-valent iron/EDTA/Air (ZEA) system were studied in a simulated sludge system. The results showed that the simulated sludge containing inorganic salts had a larger specific surface area, which was beneficial for the adsorption of PAHs. More low-ring PAHs were adsorbed on the surface of the particles in the simulated sludge because of the inorganic salts, which was conducive to low-ring PAHs degradation by US/ZEA. The PAH removal rates were increased by 15.37% and 11.19%, respectively, in the presence of SiO 3 2− and HPO 4 2− . The yield of hydroxyl radicals ( OH) was increased by 42.39% and 66.25% by SiO 3 2− and HPO 4 2− , respectively. The reason was that the oxidation of the ligand ([Fe Ⅱ (EDTA)]) formed by ethylenediaminetetraacetic acid (EDTA) and divalent iron was promoted by SiO 3 2− and HPO 4 2− . The formation of OH in the US/ZEA system was inhibited by the corrosion inhibition of SO 4 2− on zero-valent iron (ZVI), the reaction of ferric salt with EDTA, and the reaction of Mg(OH) 2 with the ligand ([Fe III (EDTA)]). This work provides an essential theoretical insight into the role of the inorganic components of sludge in the removal of PAHs by advanced oxidation processes.
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高影响因子
International Journal of Greenhouse Gas Control
·
2019
·
IF 3.231
Fan Cao,Hongxia Gao,Qian Xiong,Zhiwu Liang
CO 2 absorption performance for various blended N ,N- dimethylethanolamine (DMEA) solutions in the presence of absorption promoters including Monoethanolamine (MEA), Piperazine (PZ), 2-(Ethylamino)ethanol (EAE), 2-(Methylamino)ethanol (MAE) and 2-Amino-2-methyl-1-propanol (AMP) was investigated in terms of CO 2 absorption flux by using a polytetrafluoroethylene (PTFE) hollow fiber membrane contactor. The experimental results show that the CO 2 absorption flux increases with a reasonable increase in liquid velocity, liquid temperature and total amine concentration. Also, the CO 2 absorption flux can increase by increasing gas velocity, CO 2 partial pressure but decrease with the increased lean CO 2 loading. In addition, it can be found that all of the investigated activated amines can improve the CO 2 absorption flux of aqueous DMEA solution. For fresh amine solution, the order of CO 2 absorption flux for the investigated amine blends can be ranked as: DMEA < DMEA + AMP < DMEA + MEA < DMEA + EAE < DMEA + MAE < DMEA + PZ. By contrast, for the amine solution with CO 2 loading of over 0.3 mol/mol, the order has also changed accordingly and can be ranked as: DMEA < DMEA + AMP < DMEA + EAE < DMEA + MAE < DMEA + MEA < DMEA + PZ. The DMEA + PZ mixture presents a significant improvement up to 52.44% in CO 2 absorption flux compared to that of single DMEA solution, and can be considered as a promising alternative for CO 2 capture.
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APPLIED ENERGY
·
2019
·
IF 8.426
Xiaowen Zhang,Yufei Huang,Hongxia Gao,Xiao Luo,Zhiwu Liang,Paitoon Tontiwachwuthikul
The extensive energy penalty of CO 2 -loaded solution regeneration is one of the most crucial challenges facing industrial application of amine-based CO 2 capture technology. Here, to decrease the energy requirement, the regeneration behaviors of the rich 5 M monoethanolamine (MEA) and 3 M MEA-2.5 M N-methyl-diethanolamine (MDEA)−0.5 M piperazine (PZ) tri-solvent blended amines (tri-blend) with four different solid acid catalysts (H-mordenite, Hβ, HZSM-5 and Al 2 O 3 ) were studied at 98 °C. For the catalyst-free tests, the results revealed that the tri-blend hugely enhanced the CO 2 desorption kinetics and reduced the relative energy consumption compared to 5 M MEA. Based on the results of 13 C NMR, the multiple proton transfer paths and abundant bicarbonate ions in the tri-blend contribute to the improved regeneration performance. Additionally, the use of catalyst further improved the CO 2 desorption activity of the tri-blend. The combination of Hβ and tri-blend presented the best regeneration performance, increasing the desorption performance by 1360.8%, and reducing the relative energy requirement by 66.1% compared with the blank run of MEA. In addition, a plausible catalytic mechanism of solvent regeneration over the solid acid catalyst in the tri-blend was suggested. The superior catalytic performance of Hβ resulted from the large mesoporous surface area, larger number of Brϕnsted acid sites and prominent total acid sites. Furthermore, Hβ displayed excellent stability and had no adverse influence on the CO 2 absorption activity. Results herein manifest that the combination of tri-blend amines with high-efficiency catalyst is exceptional strategy for tremendously decreasing the energy consumption of amine-based CO 2 capture processes, ultimately making this technology more technically and economically feasible.
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Greenhouse Gases-Science and Technology
·
2019
·Vol. 9
·期 2
·349-359
·
IF 1.693
Ji Liu,Xiaoshan Li,Zewu Zhang,Liwei Li,Yajun Bi,Liqi Zhang
The carbon dioxide post-combustion capture process using amine solutions is considered the most appropriate method for CO 2 capture from flue gas in power plants. This paper focuses on the CO 2 capture performance of six common organic amines. Two amines, piperazine (PZ) and diethylenetriamine (DETA), which showed better performance, were then filtered out to form amine blends to improve performance further. The absorption heat from the CO 2 absorbing process was measured directly using an advanced C80 micro calorimeter for more accurate calculation of regenerative energy consumption. Experimental results confirmed the optimal amine blend to be 10% PZ plus 20% DETA, with a 42% increase in absorption capacity and a 9% increase in initial absorption rate compared to traditional 30% monoethanolamine (MEA). The regeneration energy consumption of this chosen PZ-DETA blend was calculated to be 3.979 GJ/ton CO 2 , a decrease of 9% compared with MEA. Moreover, it led to an improvement of about 55% in stable cyclic absorption capacity in comparison with 30% MEA. It was confirmed that this PZ-DETA blend can bring practical economic benefits to industrial applications when replacing the current 30% MEA solution. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.
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危险品化学品经营许可证（带存储）