JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Haijun Qiu,Xu Wang,Jing Cen,Penghui Shi,Jinchen Fan,Yulin Min,Qunjie Xu
Many methods used to synthesize efficient reducing agents of Fe and Al–layered double hydroxide (Fe/Al–LDH) nanosheets against oxidizing contaminants often require the use of unstable bivalent iron salts and long aging times at ambient temperatures. Here, we developed an easy-to-operate, environment-friendly, and scaled-up electrochemical engineering method without adding metal salts to synthesize Fe/Al–LDHs via an electrolytic reaction of active metal electrodes (Fe and Al). The process resulted in the growth of thin hexagonal Fe/Al–LDHs with a lateral size of approximately 100 nm and thickness of approximately 32 nm. The crystallization process of Fe/Al–LDHs strongly relied on the crystal nucleus of the first precipitate Al(OH) 3 and the Fe chemical valence. The oxidation state of Fe was markedly influenced by hydroxyl ions that formed on the cathode surface and the oxygen evolution reaction at high current density ( i ). The fast and simple manufacturing technique not only had high yield (approximately 0.2 g of Fe/Al–LDHs was obtained when i was 2 mA/cm 2 within 25 min) but also afforded Fe/Al–LDHs with excellent reducibility for the removal of Cr(VI). This study demonstrated an attractive option for the rapid and large-scale synthesis of Fe/Al–LDHs to enhance their application prospects.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Zhen Wan,Qihang Mao,Jingjing Xiang,Dongge Ma,Heqing Tang
A composite of SnS 2 and carbon nanotube (CNT) was successfully synthesized as a visible-light-driven photocatalyst with a mechanochemical method. In comparing with SnS 2 , the SnS 2 /CNT composite improved much the photocatalytic removal of Cr(VI) in acidic condition, which was confirmed to its special solid acid structure. During the synthesis of the SnS 2 /CNT composite by ball milling, S-C p-π bonding was formed between sulfur atoms in SnS 2 and carbon atoms in CNT. The generated S-C p-π bonding enhanced the transfer of photo-induced electrons in the bulk phase of the composite photocatalyst under visible light irradiation. Moreover, the persistent radical sites on CNT were able to trap photo-induced electrons and served as conjugated acid sites in the photocatalysis, which increased surface concentration of protons through their association with H + . These made the catalyst have a solid acid structure with plentiful surface protons, promoting the interfacial electron transfer between the catalysts and Cr(VI) and increasing the source of H + for the reduction of Cr(VI). As a result, the photocatalytic reduction rate of Cr(VI) on the SnS 2 /CNT composite were dramatically enhanced, being about 800% that on SnS 2 . On the basis of various characterizations and probe experiments, we confirmed the significance of the solid acid structure of the photocatalyst and clarified the catalytic mechanism of the new photocatalyst. Our finding may provide a new strategy to prepare highly active photocatalysts for proton-involved reactions.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Zhipan Wen,Jun Ke,Jinlei Xu,Sheng Guo,Yalei Zhang,Rong Chen
Toxic heavy metals As(V) and Cr(VI) removal from water environment has becoming more and more urgent due to their adverse health effect. In this study, the flowerlike Ce/Fe bimetallic oxides (CFBO), which combined the superiority of three-dimensionally (3D) hierarchical architectures and bimetallic synergistic effect, were innovatively designed and synthesized via one-step facile template-free hydrothermal method. Compared with pure iron oxides (PIO), the obtained CFBO exhibited excellent performance for As(V) and Cr(VI) removal, and the maximum adsorption capacities toward As(V) and Cr(VI) increased from 49.09 mg/g to 164.94 mg/g and 38.07 mg/g to 127.42 mg/g, respectively. Both As(V) and Cr(VI) removal efficiency decreased with an increasing solution pH due to the pH zpc of CFBO, but exhibited slightly change with coexisting anions except for SiO 3 2− and PO 4 3− ions. Combined results of FT-IR and XPS, it was concluded that the abundant hydroxyl groups existed on the surface of CFBO played a key role in the high uptake of As(V) and Cr(VI), and subsequently formed inner-sphere surface complexes. Attractively, the remarkable removal efficiency of As(V)/Cr(VI) in column experiments revealed that the CFBO had great potential for practical application.
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ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Yan Yi,Xiangyu Wang,Jun Ma,Ping Ning
Egeria najas is a submerged aquatic plant, and the literatures on resourcification of submerged aquatic plant biochar remain limited. Until now, there has been no study on submerged aquatic plant biochar supported nZVI that is widely applied for removal of diversified contaminants in solution. In this study, an efficient approach to the preparation of Egeria najas- derived biochar supported nZVI composite is first developed for Cr(VI) removal in wastewater. The adsorption behavior and mechanism of Cr(VI) removal on the as-prepared Egeria najas- derived biochar/nZVI (EN@nZVI) composite were investigated. The results of FTIR and XPS indicate that the EN@nZVI surface had many functional groups such as R-COOH, R-OH, R-NH 2 and R-C-O-C, etc, which could provide active sites during the adsorption process. The BET results showed that the EN@nZVI had large specific surface area and average pore, which were 142.49 m 2 /g and 9.85 nm, respectively. EN@nZVI demonstrated high reactivity for Cr(VI) removal. Compared with nZVI, Cr(VI) removal efficiency by EN@nZVI is 50% higher than that of nZVI within 0.5 h. Furthermore, the maximum adsorption capacity of Cr (VI) was 56.79 mg/g and the energy of activation (E a ) was 31.30 kJ/mol. The adsorption process was well described by the pseudo-second order model and Sips adsorption isotherm model. The reaction mechanism of Cr(VI) removal was a multi-step removal mechanism, involving adsorption, surface complex formation, reduction and ion exchange reaction.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Youru Yao,Na Mi,Cheng He,Yong Zhang,Li Yin,Jing Li,Wei Wang,Shaogui Yang,Huan He,Shiyin Li,Lixiao Ni
Nano ferrous sulfide (n-FeS) colloids show an excellent performance in the application of remediation in situ soil and groundwater. However, due to the interfacial effect and high reactivity of the nano sized FeS, n-FeS easy to agglomerate, which reduces their remediation efficiency. In this study, a novel composite colloid was synthesized using polyacrylic acid salt (PAA) and n-FeS. The PAA-n-FeS colloid was used to remove Cr(VI) in water remediation , and its removal mechanism and efficiency were explored. The results showed that the hydrodynamic diameter of PAA-n-FeS ranged from 65.04–90.09 nm and the zeta potential was from -27 to -54 mV at pH varying from 4.5–9.0. PAA was coated on the surface of n-FeS, which improved the dispersibility and stability of n-FeS by increasing the steric hindrance and electrostatic repulsion between n-FeS particles. Moreover, the Cr(VI) maximum removal amount PAA-n-FeS was 432.79 mg/g, which was significantly higher than that of n-FeS (218.29 mg/g) and PAA (12.32 mg/g). The mechanism of PAA-n-FeS removal of Cr(VI) was mainly derived from its own reducibility. The reaction products were mainly Cr(OH) 3 , Cr(III)-Fe(III), Cr 2 O 3 , and Cr 2 S 3 . This research not only finds a new stabilizer for preventing n-FeS agglomeration, but also provides a novel n-FeS composited colloid for promoting the practical application to Cr(VI) removal from water.
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Frontiers in Marine Science
·
2021
·
IF 4.912
Han Xiaoxin,Wang Shiyu,Yu Xue,Vogt Rolf D.,Feng Jianfeng,Zhai Lifang,Ma Weiqi,Zhu Lin,Lu Xueqiang
Due to its small size, large specific surface area and hydrophobicity, microplastics, and the adsorbed contaminants may together cause potential negative effects on ecosystems and human beings. In this study, kinetics and size effects on adsorption of Cu(II), Cr(III), and Pb(II) onto PE, PP and PET microplastic particles were explored. Results indicated that the PE and PET microplastics have the higher adsorption capacity for Cu(II), Cr(III), and Pb(II) than that for PP microplastic. The adsorption capacity was affected by microplastic types and metal species. Among the three metals, Pb(II) had the largest adsorption amount on microplastic particles, especially on PET particles. Moreover, the adsorption capacities of microplastics increase with the decrease of particle size. The metal adsorption capacity of <0.9 mm microplastics is greater than that of 0.9–2 mm and 2–5 mm microplastics. The size effect on metal adsorption was largest for PE microplastic. More attention should be paid in case of the coexistence of heavy metals and tiny PE and PET microplastics in the environment.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wei-Dong Xiao,Ling-Ping Xiao,Yi-Hui Lv,Wen-Zheng Yin,Julio Sánchez,Shang-Ru Zhai,Qing-Da An,Run-Cang Sun
Efficient removal of heavy metal ions and organic pollutants in wastewater is of great significance to healthy development of ecosystems. However, the facile preparation of novel functional materials for robust removal of both types of contaminants still remain a challenge. Herein, bifunctional composites derived from nanoscale zero-valent iron (nZVI) coated with lignin-derived carbon (LC) were fabricated via a carbothermal reduction strategy and denoted as Fe 0 @LC. This hybrid material exhibits superior performance with a maximum heavy metal removal amount of Cr(VI) as high as 575.4 mg/g from aqueous solutions. Notably, the elimination rate of Cr(VI) (100 mg/L) by Fe 0 @LC could reach up to 100% through adsorption and reduction. Furthermore, the obtained Fe 0 @LC occurs Fenton-like reactions without additional supply of H 2 O 2 toward effective degradation of organic pollutants, including 100%, 100% and 80% for methylene blue, methyl orange and congo red, respectively. The in-depth experimental and theoretical analyses reveal the synergistic effects between the catalytic Fe 0 center and the lignin-derived carbon boost the activity for catalytic degradation of organic dyes and Cr(VI) in the optimized conditions. This work not only provides critical insights into rational design, working mechanism, and application of bio-functional materials for wastewater treatment, but also achieves the goal of “treating waste with waste”.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Zhiqiao He,Lixian Jiang,Da Wang,Jianping Qiu,Jianmeng Chen,Shuang Song
A series of fluorinated anatase TiO2 nanosheets with dominant {001} facets were synthesized to oxidize p-chlorophenol (PCP) and reduce Cr(VI) simultaneously under visible light. The {001}/{101} surface facets ratio of TiO2 was controlled by varying the initial HF concentration, and fluorine-free samples were obtained by alkaline-washing. A synergistic effect among TiO2, Cr(VI), and PCP was observed, which is ascribed to effective trapping of photogenerated electrons and holes by Cr(VI) and PCP, respectively. A maximum synergistic effect was obtained at a molar ratio of [PCP] to [Cr(VI)] of one. Using X-ray diffraction, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, and Brunauer–Emmett–Teller analyses, the optimum ratio of exposed {001} to {101} facets for TiO2 was determined to be 80:20 because of selective transfer and charge balance of photogenerated carriers. Surface fluorination facilitates the formation of oxygen vacancies and unsaturated Ti atoms, which is useful for visible light activity induction, extending the lifetime of photogenerated electron-hole pairs, and enhancing the rate of PCP oxidation and Cr(VI) reduction.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Menglu Wang,Bolong Liang,Shumin Lin,Zhe Zhao,Hongbin He,Xiliang Li,Shu-xuan Liang
The magnetic Fe 3 O 4 @ZIF-8 with high adsorption properties and easy separation were embedded in BiOX (X = Cl, Br, I) to synthesize Fe 3 O 4 @ZIF-8@BiOX using a simple one-pot solvothermal strategy. The crystal structure, surface morphology, photoelectric properties, thermal stability and magnetic response of the three materials were compared and analyzed, and the effect on the removal of OTC and Cr(VI) from single and coexisting systems by adsorption-photocatalysis is discussed. The results show Fe 3 O 4 @ZIF-8@BiOI has the highest separation efficiency of photogenerated carriers upon photoexcitation and stronger light absorption capacity, and exhibits better adsorption-photocatalytic activity than the other two materials in the photocatalytic reduction of Cr(VI) (68 % and 65 % removal for single and coexisting systems) and degradation of OTC (86 % and 59 % removal for single and coexisting systems). It is noteworthy that in the coexistence of Cr(VI) and OTC, a slight decrease of removal occurred, which could be due to a competitive effect between two pollutants being greater than the synergistic effect. ∙O 2 - is the main active substances in the adsorption-photocatalysis process. Finally, this work demonstrates the excellent adsorption and photocatalytic ability of Fe 3 O 4 @ZIF-8@BiOI for the simultaneous removal of Cr(VI) and OTC, which has great potential for practical wastewater treatment.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·Vol. 40
·期 2
·326-332
·
IF 3.1
Liu Huan,Sun Xueting,Dai Yu,Zhang Xiaojin,Xia Fan
Nanochannels have made great progress and are a promising platform for detecting a series of targets. However, most nanochannels are modified on the inner wall, while ignoring the outer surface. Here, we modified the outer surface of nanochannels with hydrogel. Different from other reported outer-surface modification methods, we directly cover nanochannels with hydrogel to form heterogeneous membrane. The selected hydrogel hardly adsorbs other ions and shows specific adsorption for Cr(VI). The adsorption sites in hydrogel are homogeneous, and Cr(VI) adsorption onto hydrogel is endothermic and spontaneous. The charge in hydrogel changes after Cr(VI) adsorption, and the resulting current changes can be used for the detection of Cr(VI) with the detection limit of 10 −11 mol/L. Our platform is expected to be used for Cr(VI) detection in living organisms, especially within cells. This work provides a new approach for outer-surface modification of nanochannels and offers a new choice for nanochannel detection platforms.
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JOURNAL OF SEPARATION SCIENCE
·
2025
·Vol. 48
·期 3
·e70118
·
IF 2.8
Yu Jiang,Hong Pan,Menghong Xie,Huifeng Deng,Guihua Ruan,Yipeng Huang
In this study, magnetic Fe 3 O 4 -coated metal-organic framework composites, CONH 2 -MIL-101(Cr)/Fe 3 O 4 , were synthesized by depositing Fe 3 O 4 particles on the surface of amidated MIL-101(Cr). The scanning electron microscope images show that the MIL-101(Cr) crystals were uniformly coated by Fe 3 O 4 particles. The magnetic hysteresis curve of CONH 2 -MIL-101(Cr)/Fe 3 O 4 reveals a saturated magnetization value of 23.47 emu/g. The water contact angle decreases from 61.00° to 12.88° after amidation and Fe 3 O 4 coating. The magnetic solid-phase extraction (MSPE) efficiency of CONH 2 -MIL-101(Cr)/Fe 3 O 4 for benzoic acid derivatives was studied. Under optimal conditions, the adsorption and desorption processes can be completed within 5 min, and the maximum adsorption capacity to protocatechuic acid (PCA) and vanillic acid (VA) is 10.31 and 17.30 mg/g. Coupling the MSPE with high-performance liquid chromatography-ultraviolet detection, the detection limit for PCA and VA was 0.29 and 0.58 ng/mL, respectively. The mean recoveries of PCA and VA in spiked samples ranged from 82.85%–91.27% with relative standard deviations lower than 0.33%–5.33%. This study provides inspiration for the fabrication of novel magnetic sorbents, and a reliable method for the adsorption and analysis of benzoic acid derivatives.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yuhao Liu,Xuyi Wang,Liping Chen,Ming Cheng,Hua Wang,Jiaojiao Shang,Dan Zheng,Beibo Zhang,Jianwu Lan,Shaojian Lin
Heavy metal contamination in water poses a serious global environmental challenge. In particular, hexavalent chromium (Cr (VI)) is particularly concerning due to its carcinogenicity and genotoxicity. In this work, core–shell NH2–UiO-66@UiO-67 nanoparticles (NPs) were in situ stepwise grown on sulfonated polypropylene (PP) nonwoven to fabricate a multifunctional composite (NH2–UiO-66@UiO-67/PP composite nonwoven) for efficient removal of Cr (VI). As expected, the resulting NH2–UiO-66@UiO-67/PP composite nonwoven exhibited dual functionality for efficient Cr (VI) remediation: simultaneous adsorption and visible-light-driven photocatalytic reduction, accompanied by effective sequestration of the resulting Cr (III), due to the presence of NH2–UiO-66@UiO-67 NPs. Under visible light irradiation, the composite achieved exceptional performance, reducing Cr (VI) concentrations from 0.608 mg/L to below 0.004 mg/L and lowering total Cr concentrations from 0.876 mg/L to below 0.004 mg/L, corresponding to a removal efficiency of over 99.6%. The mechanism was elucidated as an integrated adsorption-reduction-fixation process. More importantly, the composite demonstrated outstanding recyclability, retaining 80.0% of its removal efficiency after five regeneration cycles, highlighting its practical potential. Therefore, the as-obtained NH2–UiO-66@UiO-67/PP composite nonwoven can be viewed as a highly efficient material for treating Cr (VI)-contaminated wastewater through an adsorption-photocatalytic reduction pathway.
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