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.
✓ 已验证
DOI
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”.
✓ 已验证
DOI
高影响因子
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.
✓ 已验证
DOI
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.
✓ 已验证
DOI
高影响因子
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.
✓ 已验证
DOI
高影响因子
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.
✓ 已验证
DOI
高影响因子
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.
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xifeng Zhu,Longchun Zhong,Yi Xiao,Yuan Liu,Jiawei Wang,Tao Wang,Wei-Ping Pan
To enhance the elimination of trace elemental mercury (Hg 0 ) from coal-fired flue gas, silver nanoparticles (AgNPs) were directionally anchored into the pores of MIL-101(Cr) using the double-solvent method (DSM) to achieve a highly dispersed fixed-bed adsorbent Ag@MIL-101 at room temperature. Various experimental characterizations were conducted to verify the Physical and chemical properties of the adsorbent, and fixed bed adsorption experiments evaluated the Hg 0 removal efficiency. Within the temperature range of 30–70 °C, Ag@MIL-101(Cr) achieved nearly 100 % Hg 0 removal efficiency, maintaining stability even at high concentrations of SO 2 (1500 ppm) and H 2 O (9 %). Density functional theory (DFT) revealed that the introduction of AgNPs greatly enhanced the adsorption capacity of MIL-101(Cr) for Hg 0 , with an evident electron exchange between Ag and Hg, and the adsorption energy changed from −36.91 kJ/mol to −68.59 kJ/mol. The interaction between Ag and Hg was a relatively strong weak interaction, which allowed for easy desorption at moderate temperatures (∼200 °C), significantly saving energy. Tests conducted with flue gas from an actual coal-fired power plant demonstrated that 2Ag@MIL-101(Cr) exhibited superior Hg 0 removal efficiency compared to activated carbon at the WESP outlet under low-temperature (about 50 °C) and high-humidity conditions, providing an efficient and economical solution for flue gas purification.
✓ 已验证
DOI
高影响因子
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.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Peng Shi,Xingkang Hu,Ming Duan
The water-soluble pollutant including dye and heavy metal was a challenge to the water and environment. Adsorption was among one of the most promising technique for the recycle of dye but it usually required a long contact time. A membrane-like adsorbent was fabricated by mixing and depositing tannic acid, chitosan and metal organic framework (MOF, UIO-66) on polyethersulfone (PES) membrane in this study. The material was dense enough to conduct filtration like a membrane to remove both the anionic and cationic dye (acid brilliant scarlet and methylene blue), as well as Cr(VI) from water. When the ratio of MOF/Chitosan was 30% and the pH for mixing was 3.5, the pollutant removal reached 99% in the filtration for 200 min. The adsorbent in the dynamic filtration showed a pollutant loading capacity 3 times of the capacity in the static adsorption, which was caused by the enhanced driving force brought by the concentration polarization in the filtration. The particle size of the TA/CS/MOF mixture were characterized by dynamic light scattering as well as Zeta potential , FTIR, XRD , TEM and XPS . The morphology of membrane was observed by SEM. The result showed that the MOF played as core to disperse the tannic acid-chitosan mixture to improve the pollutant removal. TEM showed the TA/CS mixture formed an uniform coating outside the MOF particle at the pH of 3.5. The pseudo 1st order and pseudo 2nd order model fitted the adsorption kinetics well, while the Elovich model did not fit very well.
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Hanyu Li,Yi Huang,Qing Luo,Jianing Liu
Treating water containing hazardous V(V) and Cr(VI) by using a efficient and simple method is an urgent need, but still a challenge. Novel binary composites (PEI-TNTs) were successfully synthesized by introducing polyethyleneimine (PEI) onto titanate nanotubes (TNTs) in a cost-effective and facile route, where TNTs and PEI existed as an interior core and an exterior shell. The removal efficiency of PEI-TNTs was highly reliant on the initial solution pH according to the batch adsorption experiments, and the maximum adsorption capacity for V(V) reached 1280.36 mg g −1 at pH 3.0 and for Cr(VI) reached 980.39 mg g −1 at pH 2.0 calculated by the Langmuir model. And PEI-TNTs effectively resisted the interference of various coexisting anions and cations. In simulated mining wastewater experiments, PEI-TNTs still remained fine V(V) and Cr(VI) adsorption capability; and PEI-TNTs could be regenerated and reused for 5 cycles without significantly reducing its removal efficiency. The excellent removal performance mainly owned to the high stability of inorganic skeleton and high surface activity from polymer modification. A comprehensive mechanism was proposed for the adsorption process associating with electrostatic attraction, redox reaction, and chelation. This work provides the theoretical and practical information for the novel inorganic–organic nanomaterials based on titanate nanotubes and polymers for the efficient reduction and adsorption of heavy metal anionic pollutants in water.
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 22
·12459-12470
·
IF 2.936
Minghua Wang,Longyu Yang,Jinyun Yuan,Linghao He,Yingpan Song,Hongzhong Zhang,Zhihong Zhang,Shaoming Fang
A series of bismuth sulfide (Bi2S3) nanorods and amine-functionalized Ti-based metal–organic framework heterojunctions [denoted by Bi2S3@NH2-MIL-125(Ti)] were constructed and explored as bifunctional photocatalysts for Cr(VI) reduction and rhodamine B (RhB) degradation under visible light illumination. Compared with the individual NH2-MIL-125(Ti) and Bi2S3, the as-synthesized Bi2S3@NH2-MIL-125(Ti) photocatalyst exhibited an enhanced photocatalytic activity toward Cr(VI) and RhB owning to the synergetic effect between Bi2S3 and NH2-MIL-125(Ti). Moreover, the Bi2S3@NH2-MIL-125(Ti) heterojunctions showed increased Cr(VI) removal efficiency by adding RhB in the system. The photocatalytic mechanism was proposed based on the analysis of different scavenger for active species and electron spin resonance spectrometry. The introduction of Bi2S3 into NH2-MIL-125(Ti) can extend the light adsorption and improve the transfer and separation of photogenerated charge carriers through the Bi2S3@NH2-MIL-125(Ti) heterojunction with unique band gap structure. The synthesized Bi2S3@NH2-MIL-125(Ti) photocatalyst also exhibited good reusability and stability.
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）