DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Jing Dong,Dengyu Yu,Lingyue Zhu,Meng Wang,Di Gu,Dandan Yuan,Tingting Jiang,Hongjun Wu,Baohui Wang
The poor conductivity and stability of ferrate salts are key factors that hinder the application of super‑iron batteries. In the paper, double strategies of graphene-coated potassium ferrate follow-up encapsulation of chitosan were proposed and implemented for enhanced the conductivity and stability of ferrate (VI) battery. The characterization and electrochemistry of modified ferrates and battery were performed in the lab works. The graphene oxide (GO)-coated and follow-up chitosan(CS)-encapsulated ferrates were successfully fabricated by a confirming of SEM images. The electrochemical and cell performance of the modified ferrates was tested and evaluated in a 10 M KOH solution using a button cell configuration. Notably, the GO-CS modified potassium ferrate exhibited superior cell performance and stability in high current discharge. Electrochemical impedance spectroscopy (EIS) reveals that the 1.75 wt% GO-CS coated sample exhibits the lowest charge transfer impedance. Discharge tests indicate that this sample outperforms the uncoated ferrate at 100 Ω while showing comparable performance at 200 Ω. UV analysis further showed that the 1.75 wt% GO-CS coating sample achieved optimal phenol degradation at both 15 mg and 20 mg doses, while the 1.05 wt% and 2.45 wt% coatings performed poorly.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 8
·3410
·
IF 4.6
Yuyu He,Liangmeng Ni,Qi Gao,Hao Ren,Mengfu Su,Yanmei Hou,Zhijia Liu
To effectively remove methylene blue (MB) from dye wastewater, a novel activated carbon (BAC) was manufactured through co-pyrolysis of bamboo shoot shell and K2FeO4. The activation process was optimized to a temperature of 750 °C and an activation time of 90 min based on its excellent adsorption capacity of 560.94 mg/g with a yield of 10.03%. The physicochemical and adsorption properties of BACs were investigated. The BAC had an ultrahigh specific surface area of 2327.7 cm2/g and abundant active functional groups. The adsorption mechanisms included chemisorption and physisorption. The Freundlich model could be used to describe the isothermal adsorption of MB. The kinetics confirmed that the adsorption of MB belonged to the pseudo-second-order model. Intra-particle diffusion was the main rate-limiting step. The thermodynamic study showed that the adsorption process was endothermic and temperature was beneficial for the improvement of adsorption property. Furthermore, the removal rate of MB was 63.5% after three cycles. The BAC will have great potential for commercial development for purifying dye wastewater.Keywords:bamboo shoot shell;activated carbon;adsorption process;methylene blue;K2FeO4
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Biomass Conversion and Biorefinery
·
2023
·
IF 4
Nie Fahui,Guan Kun,Zou Chenglong,Xu Zhiwei,Liu Zhanmeng
Ferrate, as an internal oxidation modifier, is rarely used in the preparation of magnetic biochar. This research promotes rice shell charcoal modified by K 2 FeO 4 preparation of oxygen-containing groups and ɤ-Fe 2 O 3 magnetic biochar. Magnetic rice husk biochar (MBC) is prepared to adsorb Ni(II) from aqueous solutions. The effects of various parameters on the adsorption of Ni(II) by MBC have been studied, and the results show that MBC has an excellent adsorption capacity for Ni(II). At 25 °C and pH 7.0, the removal rate of Ni(II) reaches 96.1% within 24 h at an adsorbent dose of 0.5 g/L when the initial Ni(II) concentration is 20 mg/L. The kinetic model conforms to the pseudo-second-order kinetic model and the intra-particle diffusion model within 36 h. Moreover, the adsorption data were successfully reproduced by the Langmuir isotherm, and the maximum adsorption capacity is 42.69 mg/g. The adsorption data conform to the D-R model, and the calculated average adsorption free energy is 41.03 kJ/mol, indicating that the adsorption process is mainly chemical adsorption. Thermodynamic study indicates that the endothermic adsorption process is spontaneous and can be promoted by the increase in temperature. This study was expected to provide a reference and theoretical basis for the treatment of Ni(II)-containing wastewater using modified rice husk biochar.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 29
·44504-44512
·
IF 5.19
Chen Yanghan,Jin Qiuye,Tang Zhaomin
Drug residues, including various antibiotics, are being increasingly detected in aqueous environments. Ofloxacin (OFX) is one such antibiotic that is widely used in the treatment of several bacterial infections; however, chronic exposure to this antibiotic can have adverse impacts on human health. Hence, the identification of an effective OFX degradation method is essential. Thus, in this study, the degradation performance of OFX using potassium ferrate (Fe(VI)) under the influence of different initial concentrations, pH, temperature, and common ions in water was investigated. OFX degradation by Fe(VI) was directly proportional to the concentration of Fe(VI) and temperature and inversely proportional to the pH. Among the common ions in water, Fe 3+ and NH 4 + could significantly promote the degradation of OFX by Fe(IV), while humic acid (HA) significantly inhibited it. Under the conditions of [Fe(VI)]:[OFX] = 15:1, T = 25℃, and pH = 7.0, the removal efficiency of 8 μM OFX reached more than 90% in 4 min. Seven intermediates were identified by quadrupole time-of-flight tandem ultra-performance liquid chromatography mass spectrometry (Q-TOF LC/MS), and two possible pathways for the degradation of OFX by Fe(VI) were proposed. Overall, the results suggest that advanced oxidation technology using Fe(VI) is effective for treating wastewater containing OFX.
研究领域:
环境科学
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化学工程
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水处理
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Ziyu Zhao,Shengdian Liang,Meixuan Wu,Ziyi Chen,Zhi Li,Linglin He,Qinyu Wang,Keke Wang,Shengyu Liu
Biochar can serve as an activator for potassium ferrate, significantly enhancing the treatment efficiency to antibiotics. However, the mechanism by which biochar activated potassium ferrate remained unclear, necessitating further investigation. Cellulose biochar (CBC) and lignin biochar (LBC) derived by two model compounds which were the highest proportion of content in biomass were adopted to be study object, to investigate the removal efficiency of tetracycline (TC) by ferrate synergetic with CBC and LBC, respectively for the first time, and thoroughly analyzed the adsorption and degradation processes within the reaction system. It is noteworthy that CBC contributed to this synergy primarily through the phenolic hydroxyl groups which facilitated the decomposition of ferrate and increase the generation of intermediate valence iron species, thereby improving removal rates. Whereas, LBC enhanced removal rates of TC mainly across its own adsorption capabilities. This also resulted in LBC manifesting excellent synergistic effects under various pH environments, while the CBC system was primarily suited for alkaline conditions. This study provided new theoretical support for the efficient utilization of ferrate in organic wastewater treatment and offered a novel perspective on the precise control of structure in the process of biochar material prepared by agricultural and forestry solid waste biomass.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yingzi Lin,Mingliang Zhou,Gaoqi Wang,Hao Li,Yuhang Wei,Yi Lou,Dongyan Zhang,Li Ji
Sulfamethazine (SMZ) is a pollutant that exists widely in the water environment, and it poses a threat to the environment and human health. However, the traditional water treatment process has very limited ability to remove SMZ. This paper studies the effectiveness of NaClO to remove SMZ after K 2 FeO 4 /O 3 pre-oxidation and explores the main ways of chlorination degradation of SMZ. It also studies the influence of factors, such as the dosage of different pre-oxidants, chlorination time, NaClO dosage, pH, fulvic acid and Br - on the removal effect of SMZ. The results show that pre-oxidation process of O 3 and K 2 FeO 4 significantly increases the degradation rate of subsequent chlorinated SMZ, and the degradation rate of SMZ increases by 10.49% and 8.41% separately after pre-oxidation. When the pH value of the system is neutral, the three processes have the best degradation effect on SMZ. Among them, the O 3 -NaClO process has the highest degradation rate of SMZ, up to 98.69%. FA can inhibit both the degradation rate and the degradation rate of SMZ in O 3 /K 2 FeO 4 -NaClO system, and has the most obvious inhibition on the degradation of SMZ by O 3 preoxidation, and the degradation rate decreases by 13.58%. The rise of Br - concentration will promote the efficiency of NaClO alone to oxidize SMZ, but will inhibit the chlorination degradation rate after pre-oxidation of O 3 /K 2 FeO 4 . The main pathways to chlorinate and degrade SMZ lie in the substitution of chlorine for amino groups to promote SMZ ring opening, intra-molecular Smiles-type rearrangement, and the subsequent desulfurization reactions.
研究领域:
环境科学
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水处理工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Jiawei Hu,Bing Guo,Zhuo Li,Zhigen Wu,Wenquan Tao
Anaerobic fermentation is an eco-friendly technology for waste activated sludge (WAS) treatment, during which resource recycle can be achieved. However, traditional sludge anaerobic fermentation is limited by the poor efficiency. We herein reported a novel high-efficiency technology by combining freezing with potassium ferrate (PF) for sludge pretreatment to promote hydrogen production from anaerobic fermentation. Experimental results demonstrated that freezing coupled with PF pretreatment exerted positively synergetic effect on hydrogen production. The maximal hydrogen production of 12.50 mL/g VSS (volatile suspended solids) was detected in the fermenter pretreated by freezing (−12 °C for 24 h) coupled with PF at 0.15 g/g TSS (total suspended solids), which was 1.34, 2.33, and 7.91 times of that from the individual PF, individual freezing, and control fermenters, respectively. The simulation results based on the modified Gompertz model indicated that both the hydrogen production potential and rate were promoted by freezing coupled with 0.15 g/g TSS PF pretreatment, from 2.14 to 13.52 mL/g VSS and 0.012 to 0.163 mL/g VSS/h, respectively. Thorough mechanism investigations revealed that the sludge EPS (extracellular polymeric substances) and microbial cells were both effectively damaged by combined freezing and PF pretreatment, resulting in the acceleration of sludge disintegration. Further investigations demonstrated that except for the acidogenesis, the other biochemical processes were all inhibited by freezing coupled with PF pretreatment, but the inhibitory extent for hydrogen consuming processes was more serious than that responsible for its generation. Gene sequencing analysis illuminated that both of the hydrolytic and hydrogen generating bacteria were largely enriched in the combined pretreatment fermenter. Moreover, the dewatering performances of fermented sludge were found to be notably enhanced by freezing coupled with PF pretreatment.
研究领域:
环境科学
·
微生物学
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DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Qi Gao,Liangmeng Ni,Shaowen Rong,Shushu Liu,Yanhang Zhong,Zhijia Liu
This work developed a method using bamboo shoot shells as raw material to produce Fe-modified ACs combining self-activation and chemical modification. Adding small amounts (0.5–5 %) of K 2 FeO 4 accelerated the pyrolysis process and CO 2 release, and reduced the activation energy and temperature of self-activation reaction. This increased the reaction rate and activation efficiency, ultimately significantly improving the pore structure of ACs. The addition of 3 % K 2 FeO 4 resulted in a substantial increase in specific surface area and pore volume of AC, from 1340 m 2 /g and 0.72 cm 3 /g to 2184 m 2 /g and 1.34 cm 3 /g, respectively. Additionally, the introduction of K 2 FeO 4 also enabled iron doping on the surface of the ACs. The improvement of pore structure and iron doping further enhanced the adsorption performance of ACs. The adsorption capacities of ACs for arsenate, ibuprofen, and tetracycline were up to 1.64, 1.50, and 2.38 times higher, respectively, than those of ACs prepared through conventional self-activation.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2013
·
IF 2.894
Qi Han,Wenyi Dong,Hongjie Wang,Tongzhou Liu,Feiyun Sun,Yulei Ying,Xiangling Yan
In this study, the effects of anions on the decolorization reaction by potassium ferrate(VI) were investigated for the first time and a comparative investigation between potassium ferrate(VI) and potassium permanganate was carried out. Anions such as Cl − , SO 4 2 - , and NO 3 - showed favorable effects on color removal, while, CO 3 2 - and PO 4 3 - displayed inhibitory effects. The effects of the oxidant concentration, initial solution pH, dye concentration and temperature on color removal were studied, and the removal efficiencies of chemical oxygen demand (COD) and total organic carbon (TOC) were also examined. The decolorizing capacity of ferrate(VI) was better than potassium permanganate. When dye concentration was 100 mg/L, oxidants were both 150 mg/L, 100% color removal was achieved by K 2 FeO 4 treatment while only 62.04% by KMnO 4 . Ferrate(VI) has stably high decolorizing efficiency up to 85% in a wide pH range from 4.0 to 9.0. However, potassium permanganate only had better efficiency under acidic solution (100% color removal at pH 3.0, while only 78.05% at pH 9.0). At the temperature of 60 °C, approximately 80% decolorizing efficiency was achieved by ferrate(VI) while potassium permanganate only 59.37%. Ferrate(VI) acquired 58.33% COD and 24.15% TOC removal while potassium permanganate only 42.86% and 9.94% respectively. The oxidizing order was that color > COD > TOC both for K 2 FeO 4 and KMnO 4 .
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-7
·
IF 5.228
Yu Huitao,Zhang Bangwen,Bulin Chaoke,Li Ruihong,Xing Ruiguang
As an important precursor and derivate of graphene, graphene oxide (GO) has received wide attention in recent years. However, the synthesis of GO in an economical and efficient way remains a great challenge. Here we reported an improved NaNO 3 -free Hummers method by partly replacing KMnO 4 with K 2 FeO 4 and controlling the amount of concentrated sulfuric acid. As compared to the existing NaNO 3 -free Hummers methods, this improved routine greatly reduces the reactant consumption while keeps a high yield. The obtained GO was characterized by various techniques, and its derived graphene aerogel was demonstrated as high-performance supercapacitor electrodes. This improved synthesis shows good prospects for scalable production and applications of GO and its derivatives.
研究领域:
材料科学
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化学工程
·
能源技术
✓ 已验证
DOI
PubMed
高影响因子
Frontiers in Environmental Science
·
2024
·
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.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Qiuye Jin,Dingyu Ji,Yanghan Chen,Zhaomin Tang,Yongsheng Fu
In this study, the effect of pH and oxidant dosage on the removal rate of levofloxacin (LEVO) was investigated using potassium ferrate (Fe(VI)) as an oxidant, and the degradation kinetics of LEVO was studied accordingly. CuS, as a catalyst, was subsequently used to activate Fe(VI) for LEVO degradation. The experimental results showed that the degradation rate of LEVO by Fe(VI) accords with the second-order kinetic equation. The more Fe(VI) dosage or the lower the pH value, the faster the degradation rate of Fe(VI) to LEVO. In addition, CuS could significantly improve the Fe(VI)-mediated degradation of LEVO; the Fe(VI)-CuS system achieved a removal rate of 96.9% in 30 s (which was only 24.8% in Fe(VI) system). Then, the surface characteristics of fresh and used CuS were analyzed by scanning electron microscope, Brunauer-Emmett-Teller, X-ray diffraction and X-ray photoelectron spectroscopy. Subsequently, under similar experimental conditions, different systems were established to investigate the effects of Cu 2+ and S 2- leached from CuS in Fe(VI)-CuS system. Furthermore, the radical scavengers and methyl phenyl sulfoxide probe experiments proved that Fe(V)/Fe(IV) rather than radicals play a key role in the Fe(VI)-CuS system. The reaction mechanism of CuS catalyzing Fe(VI)-mediated degradation of LEVO can be summarized as follows: Fe(VI) adsorbed on the active site oxidizes the ionic bond of CuS to form Cu 2+ and S 2- ; as an electron donor, S 2- can promote the adsorbed Fe(VI) to produce more Fe(V)/Fe(IV), thus accelerating the degradation of LEVO in Fe(VI)-CuS system. Meanwhile, the leached Cu 2+ and LEVO formed an organic complex Cu-LEVO, which is easily degraded by Fe(VI)/Fe(V)/Fe(IV) in the system. Finally, three possible degradation pathways were proposed based on 10 intermediates identified by Q-TOF LC/MS. This study provides the experimental data and theoretical support for the treatment of LEVO-containing wastewater using Fe(VI) and Fe(VI)-CuS systems.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
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