RSC Advances
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2016
·Vol. 6
·期 42
·35332-35339
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IF 3.289
Dan Chen,Xuelian Xiao,Kai Yang
In this work, a novel adsorbent derived from waste eggshell (ES) was used for phosphate and hexavalent chromium adsorption. EDS, XRD, and FTIR analyses demonstrated that α-FeOOH was successfully loaded onto the eggshell, thus increasing the available sorption sites and facilitating the adsorption abilities of phosphate and hexavalent chromium. The maximum phosphate and hexavalent chromium adsorption capacities on α-FeOOH modified eggshell (F-ES) were 248.73 and 41.57 mg g−1, which were much greater than that of the original eggshell 89.74 and 11.81 mg g−1, indicating that the modification process significantly improved the phosphate and hexavalent chromium removal abilities. Besides, the kinetics data were both well fitted with pseudo-first-order, pseudo-second-order, and Richie kinetics models, which proved that the adsorption process onto the eggshell was controlled by multiple mechanisms. In addition, the removal rates of phosphate and hexavalent chromium increased with increasing adsorbent dosage. However, the removal rates showed downward trends with pH increased from 3 to 9 and ionic strength increased from 0 to 0.1 M.
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 ENVIRONMENTAL MANAGEMENT
·
2020
·
IF 5.647
Bing Li,Li Zhang,Weizhao Yin,Sihao Lv,Ping Li,Xiangyu Zheng,Jinhua Wu
In this study, nano α-FeOOH (nFeOOH, 100–500 nm) was coated onto activated carbon (nFeOOH@AC) through a dipping means for enhanced Cr(VI) immobilization from drinking water . The nFeOOH@AC significantly improved the Cr(VI) removal from 19.9% (AC control) to 93.4%. XPS spectra and chromium speciation demonstrated that about 90% of adsorbed Cr(VI) was converted to Cr(III) by the nFeOOH@AC, accompanying with a reduction-oxidation of Fe 3+ /Fe 2+ in the nFeOOH matrix due to electrons delivering between AC and surface-bound Cr(VI). The resultant Cr(III) subsequently reacted with Fe(III) to generate stable (Cr χ Fe 1-χ )(OH) 3 precipitates, leading to a much lower Cr(III) release of 7.5% back to solution by the nFeOOH@AC as compared to the AC control of 33.8%, indicating that the nFeOOH@AC had a prospective potential for Cr(VI) immobilization and decreased Cr residue in treated drinking water. Results from column experiment also showed that the nFeOOH@AC afforded a 3.5 times higher capacity for Cr(VI) immobilization and a 3.4 times longer life-span than the pristine AC. Besides, Cr(VI) immobilization by the nFeOOH@AC was a pH-dependent process and the adsorbed Cr on the nFeOOH@AC could be readily desorbed with acetic acid. The disabled nFeOOH@AC could be refreshed by recoating nFeOOH particles with the above dipping method after stripping all the iron oxides with hydrochloric acid . This study demonstrated that nFeOOH coating is an efficient approach to enhance Cr(VI) elimination by AC during drinking water treatments.
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
CHEMOSPHERE
·
2018
·
IF 4.427
Li Yang Zhou,Shuai Chen,Hui Li,Shu Guo,Yong Di Liu,Jie Yang
S,S-ethylenediamine-N,N-disuccinic acid (EDDS) enhanced reductive dissolution of α-FeOOH by Shewanella putrefaciens CN32 (CN32), resulting in formation of surface-bound Fe(II) species ( Fe II EDDS) to improve reductive dechlorination of carbon tetrachloride (CT). The pseudo-first-order rate constants for bio-reduction extents of α-FeOOH by CN32 in the presence of 1.36 mM EDDS was 0.023 ± 0.0003 d −1 which was higher than without EDDS. The enhancement mechanism of bio-reduction was attributed to the strong complexation ability of EDDS to formed Fe III EDDS, which could be better utilized by CN32. The dechlorination kinetic of CT by Fe II EDDS (2.016 h −1 ) in the presence of 1.36 mM EDDS was 24 times faster than without EDDS. Chloroform were detected as main products for the degradation of CT. The chemical analyses and morphological observation showed that combination between EDDS and Fe 2+ produced Fe II EDDS complex, which had a reductive potential of −0.375 V and significantly enhanced CT dechlorination. The results showed that EDDS played an important role in enhancing the bio-reduction of α-FeOOH to accelerate reductive dechlorination of CT.
研究领域:
环境微生物学
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污染修复
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生物化学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Junhui Yang,Wenlei Wang,Jinglin Yin,Yanmei Li,Ziyang Xiang,Yi Peng,Ying Yan,Jing Wang,Hongbo Xiao
In this study, a matrix composite material of CdZnS and α-FeOOH on carbon cloth (CZS@FeOOH@CC) was prepared by a hydrothermal method , and was used for the degradation of As(III). The composite material has good photocatalytic activity of removing As(III) in the presence of oxalate. CZS@FeOOH@CC can completely degrade 10 mg/L As(III) within 10 min under visible light irradiation. The influence factors of CZS@FeOOH@CC composite material on catalytic oxidation of As(III) were also studied in the oxalate system. The photocatalytic oxidation efficiency of As(III) is affected by the oxalate concentration in the reaction system, and the atmosphere plays a major role in the degradation of As(III). Under visible light, oxalate first combines with Fe(III) on the surface of iron oxide to form Fe(III)-oxalate complex, and then the Fe(III)-oxalate composite is activated to produce·C 2 O 4 − . In the presence of oxygen, Fe(II) readily reacts with O 2 and oxidizes to Fe(III). The introduction of CdZnS promoted the separation of interfacial electron holes, and accelerated the REDOX cycle of Fe(II)/Fe(III). This study provides a feasible and simple method for accelerating the catalytic removal of heavy metals from wastewater by iron-based materials.
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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2026
·Vol. 37
·期 22
·1771
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IF 3.2
Zhang Enlei,Xu Zhiyi,Song Xiaowen,Wang Shuyuan,Zhang Bengui,Xie Yingpeng,Wang Guosheng
Hydrogen peroxide (H 2 O 2 ) detection is of great significance in environmental monitoring, food safety, and clinical diagnosis. Copper doping into α-FeOOH nanorods significantly enhanced the sensitivity and stability for electrochemical detection of H 2 O 2 . The structure and surface morphology of the products were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The electrochemical properties of CuFe 2 O 4 /α-FeOOH were studied by cyclic voltammetry and amperometry. The results showed that the composition and morphology of the as-prepared products were dependent on the Cu doping level. When the Cu doping level was up to 10 mol%, a spinel copper ferrite (CuFe 2 O 4 ) phase was formed in the product, accompanied by a morphological evolution into nanoparticles. The CuFe 2 O 4 /α-FeOOH/FTO (Fluorine-doped tin oxide) electrode exhibited excellent performance to detection of H 2 O 2 with high sensitivity (125.86 μA·mM −1 ·cm −2 ) and a low detection limit (0.56 μM, S/N = 3). Finally, the possible mechanism of the CuFe 2 O 4 /α-FeOOH catalysts for H 2 O 2 detection was analyzed and discussed.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 56
·51247-51256
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IF 3.289
Chuanping Gao,Ga Zhang,Tingmei Wang,Qihua Wang
The formation of a tribo-film on the counterface plays an important role on the tribological performances of polymer subjected to mixed and boundary lubrication conditions. However, when freshwater is used as a lubricant, the formation of a tribo-film usually is hindered. In order to overcome this disadvantage, PEEK/α-FeOOH nanocomposites were developed and their tribological performances were studied under water lubrication conditions in the present work. It was demonstrated that the inclusion of α-FeOOH nanoparticles (NPs) into the PEEK matrix improves significantly the tribological performance of the matrix. The nanostructures and properties of the tribo-films formed on the steel counterface were comprehensively studied. It was identified that the addition of α-FeOOH NPs promotes the formation of a lubricating tribo-film which covers the entire counterface. Based on the investigations on tribo-films, we deem that the α-FeOOH NPs act as precursors for the dehydration reaction promoting the formation of a tribo-film which consists of α-Fe2O3 and transferred PEEK. It is assumed that the enhanced tribological performance is related to the possibly high load-bearing capability and “easy-to-shear” characteristic of the tribo-film.
研究领域:
材料科学
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摩擦学
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聚合物纳米复合材料
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润滑工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Li Yuan,Xueqian Wang,Xiang Li,Jianhong Wang,Langlang Wang,Yiran Xiong,Yuhang Xiao,Ping Ning
The performance of FeOOH for the removal of hydrogen sulfide (H 2 S) has been widely investigated. However, the harsh conditions of use and the difficulty of regeneration limit its practical application. In this study, FeOOH was loaded on activated carbon (AC) by a hydrothermal method to obtain a series of XF-AC catalysts for the removal of H 2 S from blast furnace gas (BFG). Among these catalysts, 3F-AC exhibited a high penetrating sulfur capacity of 482.3 mg/g and good regeneration performance. It is noteworthy that the use of AC as the support induced the transformation of α-FeOOH crystals into amorphous FeOOH and affected their morphology, and uniformly dispersed nanoparticles rather than agglomerated acicular crystals appeared on the surface of AC. The presence of amorphous FeOOH modulated the basic sites and surface hydroxyl groups of the catalysts while generating hydroxyl radicals during the reaction, thus improving the adsorption and oxidation of H 2 S. More importantly, the structural properties (surface area and pore volume) of 3F-AC enhanced the storage capacity of elemental sulfur and reduced the formation of by-products. The cyclic catalytic role of Fe 3+ /Fe 2+ played an important role in the oxidation process. This work provides a simple and effective strategy for the design of BFG desulfurization catalysts.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Siqi Huang,Qun Zhang,Pengyu Liu,Shengjia Ma,Bing Xie,Kai Yang,Yaping Zhao
In this study, novel up-converted carbon quantum dots (CQD) incorporated goethite (α-FeOOH) nanohybrids (CQDs/α-FeOOH) were fabricated via a facile hydrolysis method. CQDs/α-FeOOH exhibited remarkably degradation efficiency towards tetracycline (TC, 0.1503 min -1 ), approximately 3.7 times than pristine α-FeOOH with much lower amount of H 2 O 2 (0.5 mM) under visible light irradiation (λ＞420 nm). The quenching and electron spin resonance (ESR) tests proved · OH, O 2 · - and 1 O 2 were involved in TC degradation in CQDs/α-FeOOH catalyzed Fenton system. The potential Ultraviolet-Visible-Infrared (UV–vis-IR) broad-spectrum responsive properties of CQDs/α-FeOOH were proved in degradation various surface charged organic contaminants regarding the function of coupling up-conversion CQDs. CQDs/α-FeOOH also exhibited wide application pH, excellent durability, fairly good catalytic performance within different practical water matrices and completely eliminated related drug resistance of TC even under real solar-light conditions. The good biocompatibility makes CQDs/α-FeOOH served as a promising photocatalyst for remediation of water contamination with efficient utilization of solar energy.
研究领域:
环境科学
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材料科学
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生物学
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DOI
高影响因子
Water
·
2022
·Vol. 14
·期 14
·2260
·
IF 3.53
Md. Nahid Pervez,Shengjia Ma,Siqi Huang,Vincenzo Naddeo,Yaping Zhao
In the current work, novel graphene quantum dots (GQDs)-doped goethite (α-FeOOH) nanocomposites (GQDs/α-FeOOH) were prepared by following a feasible hydrolysis method and applied for ciprofloxacin (CIP) removal. Results showed that the CIP degradation efficiency was significant (93.73%, 0.0566 min−1) in the GQDs/α-FeOOH + H2O2+ Vis system using much lower amounts of H2O2(0.50 mM), which is 3.9 times the α-FeOOH + H2O2+ Vis system. It was found that •OH,O2•−, and1O2were mainly responsible for CIP degradation in the GQDs/α-FeOOH photo-Fenton system. GQDs/α-FeOOH demonstrated broad-spectrum UV–vis-IR responsiveness in the degradation of ciprofloxacin as a function of the doping of GQDs. Additionally, GQDs/α-FeOOH showed outstanding durability (recyclability up to 3 cycles with a lower iron leaking amount, 0.020 mg L−1), a broad range of application pH, and a pretty acceptable catalytic efficacy in a variety of surface water matrices. Overall, GQDs/α-FeOOH have been shown to be an effective photocatalyst for the remediation of emerging contaminants via the workable exploitation of solar energy.Keywords:GQDs;goethite;emerging contaminants;photo-Fenton-like reaction;water pollution
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 13
·7269-7279
·
IF 2.936
Junyu Fan,Zhiwei Zhao,Zhaoxia Ding,Jie Liu
In this study, different crystalline structures of FeOOH have been prepared. α-FeOOH was synthesized through a hydrothermal method, whereas β-FeOOH was synthesized via a direct hydrolysis method. Moreover, γ- and δ-FeOOH were prepared by precipitation methods through slow and quick oxidation, respectively. On this basis, their crystal structure, morphology, and surface area were measured. Then, all the synthesized materials were applied to activate peroxymonosulfate (PMS) to generate sulfate radicals (SO4−˙) for acid orange 7(AO7) degradation. Compared with α-FeOOH, β-FeOOH, and γ-FeOOH, δ-FeOOH showed more efficient decolorization of AO7 in the catalytic system because of its abundant surface area and crystalline structure. The effects of several parameters in the δ-FeOOH/PMS/AO7 system were investigated. The results show that the initial pH, which is related to the features of surface hydroxyl groups, is the decisive factor, and excellent catalytic activity is maintained in the pH range 5–8. The increase of catalyst dosage and appropriate increase of PMS concentration contributed to promote the degradation effect. However, self-quenching was observed in a high PMS concentration system. Moreover, δ-FeOOH was stable after six consecutive cycles, and the leaching of iron ions was negligible. According to the quenching test and electron spin resonance analysis, both SO4−˙ and ˙OH were the dominant radicals for AO7 degradation.
研究领域:
环境科学
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催化
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水处理
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DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Hongshan Jia,Yingqing Zhan,Fei Zhu,Ximin Chen,Yajie Lei,Xinyue Duan,Jie Liu
In the practical purification of oily wastewater, the application of polymer-based membrane is greatly restricted due to the oil adhesion and complicated fouling problems. Herein, to conquer the aforementioned challenges, we prepared the polyphenol mediated Photo-Fenton self-cleaning and superhydrophilic/underwater superoleophobic α-FeOOH/g-C 3 N 4 @PVDF composite membrane via simple vacuum-assisted self-assembly technology. The g-C 3 N 4 nanosheets modified by tannic acid were introduced into the surface of PVDF ultrafiltration membrane, in which the intercalation structure was regulated by the random interpenetration of α-FeOOH nanorods . The abundant hydroxyl and amino groups and the rough micro-nano structure formed by intercalation structure were favorable for the superhydrophilic feature (WCA = 0°, UOCA>150°), thus resulting in ultra-low oil adhesion. Specially, the intercalation structure improved the water permeation channel, further promoting the water/oil separation flux. Therefore, the composite membrane exhibited superior separation flux (452.35–650.21 L m −2 h −1 ) and separation efficiency (>99.06 %) for various surfactant-stabilized emulsions. Moreover, thanks to the Photo-Fenton reaction, the composite membrane showed excellent degradation efficiency on simulated pollutants (various dyes) within 60 min (MeB: 95.55 %, CR: 90.83 %, MO: 98.90 %, CV: 95.11 %), showing satisfactory photocatalytic self-cleaning performance. This work provides a strategy for the potential application of polymer-based membranes in the treatment of complex surfactant-stabilized emulsion wastewater from petrochemical industry.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Shanshan Su,Chengjin Cao,Yaping Zhao,Dionysios D. Dionysiou
Roxarsone (ROX) is extensively used as a feed additive which tends to leave toxic inorganic arsenic (As) in the natural environment. A composite of reduced graphene oxide and carbon nanotubes was impregnated with goethite designated as α-FeOOH@GCA and tested as an integrated catalyst and adsorbent for ROX decontamination. Nearly 100% of the ROX was transformed in α-FeOOH@GCA activating persulfate (PS) under UV 365 irradiation system at relatively low dosage of the α-FeOOH@GCA catalyst (250 mg L −1 ) in 120 min. The As(V) released in the ROX oxidation was simultaneously adsorbed onto the surface of the α-FeOOH@GCA. A possible ROX transformation pathway is proposed. The As(V) adsorbed on catalyst was recovered and used to form an efficient Ag 3 AsO 4 photocatalyst. This work further extends the oxidation-adsorption technology in solving organoarsenical contamination without producing secondary pollution.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）