Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Lingjie Liu,Shaoqing Mo,Shaopo Wang,Jing Chang,Jianhui Zhao,Jingjie Yu
Low temperatures were a critical factor that inhibited anaerobic ammonium oxidizing bacteria (AnAOB) activity. This study demonstrated the effect of exogenous zero-valent iron (ZVI) on Anammox-hydroxyapatite (HAP) system at 17°C. The results showed that long-term addition of ZVI increased the system nitrogen removal efficiency by 8.59% and alleviated the inhibition of AnAOB by low temperature. After addition of ZVI, the activity of AnAOB and the heme c content increased by 58.20% and 4.83%, respectively. Moreover, the functional enzyme activities of NIR, HZS, and HZO increased by 94.12%, 36.36%, and 16.67%, respectively. The concentrations of quorum sensing molecules, i.e., C 6 -HSL and C 8 -HSL, increased by 191.17% and 41.54%, respectively, after ZVI addition. Metagenomic analysis revealed that the addition of 5 g/L ZVI stimulated the relative abundance relative abundance of Fe(II) metabolism-related genes in AnAOB at 17 °C, thereby contributing to the uptake, transport, utilization, and storage of Fe(II). The addition of ZVI could improve the nitrogen removal performance of the anammox-HAP system at the low temperature.
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BIOCHEMICAL ENGINEERING JOURNAL
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2024
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IF 3.7
Hongyuan Sun,Rui Tang,Kuizu Su,Shoujun Yuan,Jingwei Feng,Wei Wang,Zhen-Hu Hu
Anaerobic digestion (AD) is widely used for the treatment of pig manure, but is easily suffered from ammonia inhibition. The residual pathogenic bacteria and antibiotic resistance genes in the digestate pose potential risks to human health and the environment. Zero-valent iron (ZVI) addition in AD has been extensively investigated to enhance AD performance, but little is known about the impacts of ZVI addition on ammonia inhibition and the digestate biosafety. In this study, the effect of ZVI addition on ammonia inhibition alleviation and reduction of fecal indicator bacteria and antibiotic resistance genes in AD of pig manure and its mechanisms were investigated. ZVI addition at 10 g/L effectively alleviated ammonia inhibition and promoted a shift in dominant methanogens, improving the tolerance of AD systems to high concentration of ammonia. Interestingly, ZVI addition within 5–20 g/L significantly enhanced the reduction of total coliforms, Enterococci and tetracycline resistance genes in the digestate, which was due to the generation of ferrous ions, causing the co-precipitation of suspended solids and indicator bacteria. These results provided valuable insights for the potential application of ZVI addition in the AD of pig manure.
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Journal of Water Process Engineering
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2024
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IF 6.3
Yun-fei Zhang,Xin Quan,Sheng-gui Chen,Jian-hui Xu,Dan Li,Lei Li,Si-hao Lv,Jin-ze Li,Yi-hang Zhang,Zhuo-wei Zhong
In this study, silicon nitride-zero-valent iron (Si 3 N 4 -ZVI) powders were obtained through post-milling and employed as a catalyst to activate peracetic acid (PAA) for the removal of Ranitidine (RAN). The system achieved an impressive 90.4 % of degradation efficiency, with a pseudo-first-order kinetic reaction constant 11.3 times higher than that of the ZVI/PAA system. Quenching experiments and Electron Paramagnetic Resonance (EPR) analysis confirmed that both radical and non-radical processes are involved in RAN degradation within the Si 3 N 4 -ZVI/PAA system. Moreover, the identified ten degradation products are less toxic compared to the byproducts from alternative oxidation methods reported by prior literature. The proposed degradation pathway of RAN includes C S cleavage, oxygenation/hydroxylation demethylation, and denitrification. Furthermore, the Si 3 N 4 -ZVI/PAA system showed effectively in treating RAN-contaminated surface water, artificial wastewater, and dissolved organic matter, demonstrating its great ability in treating diverse organic-contaminated water sources. In conclusion, results of this study suggest that the Si 3 N 4 -ZVI/PAA system possess high pollutant removal efficiency, broad applicability, and less environmental and health risks.
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International Journal of Environmental Science and Technology
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2024
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IF 3
Yi L.,Li W.,Bu H.,Yin W.,Deng H.,Wu J.
Humic acid, nitrate, and sulfate in the environment may affect the performance of abiotic and biotic zero-valent iron (Fe 0 ) on the remediation of heavy metal-contaminated soil. In this study, a synergistic system combining Fe 0 and microbes was established to remediate Cr(VI)-contaminated soil at low and relatively high concentrations of humic acid, nitrate, and sulfate with Fe 0 as a control. In the abiotic Fe 0 system, humic acid inhibited Cr(VI) removal by occupying iron surface with its oxygen-containing functional groups and generating iron or calcium-containing precipitates on Fe 0 surface. However, microbes could effectively degrade humic acid to promote their growth, iron corrosion, and secondary mineral production for enhanced Cr(VI) removal. As for nitrate, it showed slightly promoted effect on iron corrosion in abiotic Fe 0 , but competed with Cr(VI) for cathodic hydrogen from iron corrosion for biological denitrification and thereby significantly inhibited Cr(VI) removal in biotic Fe 0 . Different from denitrification, hydrogenotrophic desulfuration promoted active mineral generation such as iron sulfide and green rust owning to biomineralization. These minerals were beneficial for Cr(VI) adsorption and reduction. Thus, in the biotic Fe 0 system, the presence of 10 mmol kg −1 sulfate led to a higher Cr(VI) removal of 79.5% as compared to that of 48.4% in the system without sulfate. The results indicated that it is necessary to deeply understand the potential effects of organic substrates and electron acceptors on Cr(VI) removal in soil when using abiotic and biotic Fe 0 before their application.
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Frontiers in Environmental Science
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2024
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IF 3.3
Huang Yuanyuan,Yang Qingwei,Song Ling,Ran Hongjie,Jiang Hui,Sun Da
In this study, we investigated the oxidative mechanisms of nano zero-valent iron (nZVI) enhanced potassium ferrate (K2FeO4), focusing on tributyltin (TBT) and triphenyltin (TPhT) as target pollutants. The addition of nZVI enhanced the degradation of both organic tin compounds by K2FeO4, exhibiting pseudo-first-order kinetics influenced by pH, carbonate, and fulvic acid. nZVI, as a reducing agent, facilitated the generation of stronger oxidizing species Fe (V) and Fe (IV) from K2FeO4 through electron transfer. The presence of hydroxyl radicals (OH) was confirmed by tert-butyl alcohol (TBA) verification. Intermediate products of TBT degradation by nZVI-enhanced K2FeO4 were identified using GC-MS, confirming de-alkylation leading to stepwise oxidation to inorganic tin ions. Due to excessively long Sn-C bonds in diphenyltin, rendering them unstable, Density Functional Theory (DFT) calculations were employed. Results indicated that Fe (IV) and Fe (V) predominantly attacked the Sn-C bonds of TPhT, while OH primarily targeted the benzene ring. HOMO energy levels suggested that Fe (V) was more prone to oxidizing TPhT than Fe (IV). Gibbs free energy calculations demonstrated that, in the presence of Fe (IV) and Fe (V), the energy barrier for breaking bonds and oxidizing into inorganic tin ions decreased, favoring the process over the self-decomposition of TPhT. Additionally, the lower energy barrier for OH indicated an easier degradation of TPhT. This study reveals that nZVI-enhanced K2FeO4 effectively removes TBT and TPhT, contributing to the understanding of the ferrate-mediated degradation mechanism of organic tin compounds. The findings offer insights and theoretical guidance for remediating organic tin pollution in aquatic environments.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Guoqing Wu,Hongyu Wang,Lei Huang,Jia Yan,Xuanxuan Chen,Huabing Zhu,Yi Wu,Shumei Liu,Xiaozhen Shen,Weiqi Liu,Xianjie Liu,Hongguo Zhang
The efficient capture of copper ions (Cu 2+ ) in wastewater has dual significance in pollution control and resource recovery. Prussian blue analog (PBA)-based pseudocapacitive materials with open frameworks and abundant metal sites have attracted considerable attention as capacitive deionization (CDI) electrodes for copper removal. In this study, the efficiency of copper hexacyanoferrate (CuHCF) as CDI electrode for Cu 2+ treating was evaluated for the first time upon the successful synthesis of copper hexacyanoferrate/carbon sheet combination (CuHCF/C) by introducing carbon sheet as conductive substrate. CuHCF/C exhibited significant pseudocapacitance and high specific capacitance (52.92 F g −1 ) through the intercalation, deintercalation, and coupling of Cu + /Cu 2+ and Fe 2+ /Fe 3+ redox pairs. At 0.8 an applied voltage and CuSO 4 feed liquid concentration of 100 mg L −1 , the salt adsorption capacity was 134.47 mg g −1 higher than those of most reported electrodes. Moreover, CuHCF/C demonstrated excellent Cu 2+ selectivity in multi-ion coexisting solutions and in actual wastewater experiments. Density functional theory (DFT) calculations were employed to elucidate the mechanism. This study not only reveals the essence of Cu 2+ deionization by PBAs pseudocapacitance with promising potential applications but also provides a new strategy for selecting efficient CDI electrodes for Cu 2+ removal.
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BIORESOURCE TECHNOLOGY
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2024
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IF 9.7
Zongshuo Han,Ruijie Hu,Xiaoying Zheng,Zhilin Zhao,Wenfei Li,Haidong He,Tao Lin,Hang Xu
The long acclimation period and sensitivity to environmental conditions of Anammox are the bottlenecks for its promotion and application. An innovative strategy was adopted to accelerate functional microbial enhancement and improve nitrogen removal performance by inoculating cryopreserved Anammox sludge and activated sludge with intermittent dosing of nanoscale zero-valent iron (nZVI). The acclimation time was shortened by 76 days with nitrogen removal efficiency (NRE) reaching up to 91.07 %. Anammox, NDFO (nitrate/nitrite-dependent Fe(II) oxidation), Feammox (Fe(III) reduction coupled with anaerobic ammonium oxidation) and abiotic reactions were coupled in the system with nZVI, contributing to 69.79 %, 15.14 %, 9.84 % and 0.25 % of nitrogen removal, respectively. Further microbial analysis demonstrated significant enrichment of functional microorganisms, such as Candidatus Jettenia , Acidovorax and Comamonas . High-efficient nitrogen removal was attribute to the increase of functional genes involved in Anammox, electronic transfer, heme C synthesis and iron metabolism. This work provides an inspiring idea for the mainstream Anammox application.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Rui Qin,Ji Chen,Yan Bai
NdFeB waste serves not only as a crucial resource for the recovery of rare earth elements (REEs) but also as an underutilized source of gallium (Ga). In this work, to simultaneously extract REEs and Ga from NdFeB waste, an efficient and novel method was developed, which involved the process of leaching, reduction, solvent extraction, precipitation, and calcination. Initially, the Pr, Nd, and Ga were co-leached with 5 mol/L HCl and liquid-solid ratio (mL/g) of 5:1 at 90 °C for 150 min, resulting in the leaching rate of Pr, Nd, and Ga were 98 %, 99 %, and 98 %, respectively. Secondly, to mitigate the interference of Fe (III) on the extraction process, Fe (III) was reduced to Fe (II) completely using Fe powder for 10 min, given that the excess iron powder factor was 1.2. Then, the tributyl phosphate (TBP) was chosen as the extractant for Ga due to its high selectivity. Under the optimal conditions, three-stage counter-current extraction achieved an extraction efficiency of 99 % for Ga, with the addition of 10 % isodecanol to eliminate the third phase. The gallium was completely stripped by water at a phase ratio (O/A) of 2:1. Subsequently, di-2-ethylhexylphosphoric acid was selected as the Pr and Nd extractant because of its high separation ability between REEs and Fe (II). The extraction efficiency of Pr and Nd achieved more than 99 % through three-stage counter-current extraction and the entire stripping of Pr and Nd was realized by 1.8 mol/L HCl. Additionally, a significant amount of Fe (II) in the raffinate was treated via adding oxalic acid to obtain FeC 2 O 4 ⋅ 2H 2 O. Finally, the Ga 2 O 3 and Nd 2 O 3 (PrO 2 ) were prepared from the stripping solution. According to the whole process, the yield of Ga, Pr, and Nd was 93.4 %, 97 %, and 98 %, with the purity of Ga 2 O 3 and Nd 2 O 3 (PrO 2 ) being 98.6 % and 98.4 %, respectively. The results suggested that the stepwise recovery of REEs and Ga from NdFeB waste can be achieved.
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高影响因子
FUEL
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2024
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IF 6.7
Wenfeng Peng,Zhengxing Lv,Wenju Zhou,Bingmin Yan,Shijing Zhao,Lailei Wu,Junshuang Zhou,Huiyang Gou
Creating highly efficient bifunctional transition metal phosphide catalysts for electrochemical water splitting through cost-effective and universal methods remains an elusive challenge. Here we introduce a universal high temperature and high pressure (HTHP) technique that readily produce phase-pure TMPs, including FeNiP, CoNiP, and Fe 2/3 Co 2/3 Ni 2/3 P (CFNP), which can serve as an ideal model for investigating the relationship between electrocatalytic activity, structure, and chemical composition. The crystal structure of obtained CFNP has been carefully determined for the first time by using single-crystal X-ray diffraction (XRD) and XAS simulations. In the structure of CFNP, iron atoms form an MP4 tetrahedron with Co atoms and a 5-coordination pyramid with Ni atoms. This arrangement synergistically induces an electron-deficient state in the metals and an electron-rich state in phosphorus, enhancing CFNP/NF’s bifunctional catalytic effectiveness, achieving low overpotentials of 92 mV and 239 mV at 10 mA/cm 2 in 1 M KOH environment for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Moreover, an integrated electrolyzer using CFNP/NF as both electrode components can achieve a current density of 10 mA cm −2 at 1.536 V, showcasing a catalytic activity for overall water splitting comparable to those of phosphide-based electrocatalysts. The HTPH technique opens new possibility for exploring pure-phase multimetallics and high-entropy phosphides as potential multifunctional materials for potential applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yuxuan Shao,Junjie Ni,Jie Yin,Xinqing Liu,Yulai Song,Yue Xu,Shuai Guo,Laima Luo
The construction of heterojunctions between non-noble-metal based compounds affords a scheme for accelerating the reaction kinetics of oxygen evolution reaction (OER) without using precious mental materials, which is extremely important but remains challenging. Herein, the heterogeneous structure between Fe 60 Co 10 Ni 10 Cr 10 Mn 10 medium-entropy alloy (MEA) and FeS 2 is developed by a mechanical alloying approach. The resulting MEA-30 wt%FeS 2 delivers a high OER activity with a low overpotential of 261.6 mV at 10 mA/cm 2 , along with Tafel slope of 52.7 mV/dec in 1.0 mol/L KOH solution, superior to the commercial RuO 2 . The combination of detailed characterization techniques and density functional theory (DFT) calculation reveals that the heterojunctions between Fe-based MEA and FeS 2 generates the synergistic effect on the activation and formation steps of OOH*, thus promoting the OER reaction kinetics. Furthermore, the abundant active sites provided by the reconstructions of MEA-30 wt%FeS 2 during OER process also contributes to the catalytic performance. This work greatly expands the application scope of medium-entropy materials and provides a new method for the fabrication of novel heterogeneous electrocatalyst of Fe-based MEA and FeS 2 .
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2024
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IF 6.3
Fei Wang,Yuliang Zhang,Mengyang Cong,Ting Shu,Ying Qin,Yanhua Lei,Miranda Liu,Xiaobo Chen,Yi Lin,Zecheng Qian
The continual optimization and advancement of solar desalination technology represent an ongoing focal point in addressing the persistent challenge of freshwater scarcity. In the solar evaporator , subjected to high concentrations of saltwater and intense solar irradiation , as well as other demanding operational conditions, the presence of salt accumulation at the photothermal interface inevitably diminishes both the evaporation efficiency and the service life of the photothermal evaporator. In this study, we have successfully coated polypyrrole with carbon nanopowder (C), iron nanopowder (Fe), boron nitride (BN), boron carbide (B 4 C), molybdenum disulphide (MoS 2 ), and molybdenum carbide (Mo 2 C) through in-situ polymerization, and have assembled these coated materials with blends of polyvinyl alcohol/poly (vinylidene fluoride), creating an innovative amphiphilic photothermal composite film . The resulting thin-film evaporator has achieved an impressive 94.7 % evaporation efficiency under 1 sun irradiation. Introducing perforations on the film evaporator's surface further improves efficiency, reaching approximately 87.0 % under prolonged exposure to high salinity (20 %) conditions. This improvement is attributed to the increased water pathway facilitated by the perforations, preventing salt particle deposition on the evaporator's surface and significantly enhancing desalination efficiency.
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LANGMUIR
·
2024
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IF 3.7
Xiangchi Liu,Ailing Liu,Baijun Liu,Mingyao Zhang
Sustainable development has become an inevitable trend in the world’s green chemical industry for a generation or more. In this study, a monodisperse magnetic polystyrene mesoporous composite microsphere (MPPS) composed of Fe3O4 nanoparticles loaded on polystyrene mesoporous microspheres is introduced. These microspheres serve as effective adsorbents for the swift removal of cationic dyes. The fabrication of the wastewater adsorbent, with its simple operation and economic practicality, involved a combination of dispersion polymerization, a sulfonation reaction, two-step swelling polymerization, and in situ alkaline oxidation technology. Notably, the adsorption capacity within 3 min reaches 184.0 mg/g, with an impressive adsorption efficiency of 92%. This is primarily attributed to the high specific surface area (Smax) of the MPPS providing more reaction sites for π–π interaction. Simultaneously, the attractive force between negatively charged sulfonic acid groups and cationic dyes is enhanced through surface modification of the MPPS. Furthermore, the MPPS, boasting a maximum saturation magnetization of 38.19 emu/g, ensures rapid separation from the solution for recycling within 3 s. Even after 5 cycles, the adsorption efficiency remains over 90%. The rapid separation of dyes is facilitated by the magnetic attraction of Fe3O4 nanoparticles from the MPPS under the application of a magnetic field. These composite mesoporous materials exhibit outstanding performance in both efficient selective adsorption and recyclability, presenting a novel green adsorbent with promising prospects for sustainable development. This innovation is poised to excel in fields such as sewage treatment, separation, and purification.
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