SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Chao Duan,Shasha Che,Guodong Tian,Yiyang Che,Xiaoran Nie,Lei Dai
Abundant hazardous pollutants, in particular heavy metal ions and microbes, in aqueous systems seriously threaten ecological safety and human health. Photocatalysis is deemed an appealing solution yet remains challenging to exploit more efficient, economical, and sustainable photocatalytic materials. In this study, we successfully fabricated a cellulose paper-based composite membrane, namely Zr-TCPP@PDA@FP, for photoreduction of Cr(VI) and photothermal antimicrobial. For the resultant composite membrane, the self-polymerization polydopamine (PDA)-coated cellulose fibers act as sustainable scaffolds to anchor the in-situ synthesized porphyrin-doped UiO-66-NH 2 (Zr-TCPP) nano-photocatalysts. The hypotheses are that: 1) porphyrin doping in Zr-TCPP can both reinforce the visible-light absorption and the transport of photogenerated electrons; 2) mussel-inspired PDA coating on fiber surface not only services as binder to promote the Zr-TCPP loading and dispersion, but also functions as heterojunction interface to accelerate photogenerated electron separation and transfer from Zr-TCPP; As a result, Zr-TCPP@PDA@FP exhibited significant photocatalytic reduction towards Cr(VI), achieving a removal efficiency of 93.9 % within 20 mins and cycling stability. Besides, the hybrid membrane also featured excellent photothermal antibacterial performance (over 99 % for both E. coli and S. aureus ). This work will inspire the development of economic and sustainable cellulose-based functional materials for efficient wastewater remediation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Liping Liang,Fenfen Xi,Jinhui Zhao,Gunel Imanova,Sridhar Komarneni,Jianfeng Ma
nZVI was immobilized on MIL-101(Cr), a metal–organic framework (MOF), and subsequently utilized for the removal of U(VI) from aqueous solution. This composite was also tested for its toxicity to Escherichia coli ( E. coli ). The results demonstrated that MIL-101(Cr) and nZVI had a significant synergistic effect. This composite material is excellent for removing U(VI) and the optimal ratio of MIL-101(Cr) to nZVI was found to be 1.2:1 on mass basis. Adsorption data exhibited excellent fitting to the Freundlich and pseudo-second-order kinetic models, and a maximum removal capacity of 526.32 mg/g of U(VI) was achieved by M-Fe at 298 K (pH = 6.0). The removal mechanisms were clarified by the X-ray absorption near edge structure (XANES), X-ray photoelectron spectroscopy (XPS), and extended X-ray absorption fine structure (EXAFS). Results reveled that U(VI) was mainly removed through chemisorption, forming a bidentate mononuclear edge-sharing linkage between UO 3 pyramid and iron(hydro)oxide. Through free radical quenching experiments and EPR analysis, it was indicated that the existence of reactive oxygen species (ROS) accelerates the oxidation of nZVI, generating more iron oxides or hydroxides for U(VI) adsorption, while inhibiting the reduction of U(VI) to U(IV). Furthermore, immobilized nZVI on MIL-101(Cr) mitigated the biotoxicity of Escherichia coli ( E. coli ). Direct contact played a crucial role in inactivating E. coli cells by nZVI/ E. coli system. Extracellular reactive oxygen species (ROS) played a vital role in inactivating E. coli in the M-Fe/ E. coli system where OH is the main ROS. These findings enhance our understanding of the mechanism of U(VI) removal and bactericidal effect on organisms using ZVI-based composites, which will broaden the application scope of the two materials in pollution removal, especially in radioactive decontamination.
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JOURNAL OF CHROMATOGRAPHY A
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2024
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IF 3.8
Tianci Lv,Fubin Liu,Mengqian Xiao,Ying Liu,Litao Wang,Guihua Gao
In this study, a novel hierarchical pore MIL-101(Cr) foam (HPF-MIL-101) was designed and prepared using the sacrificial template method with NaCl as the sacrificial template. This method involved grinding, heating, and washing the NaCl template to produce HPF-MIL-101, with PVDF as the binder and MIL-101(Cr) as the adsorbent. This preparation process is both straightforward and cost-effective, avoiding the use or generation of any organic reagents, thereby offering an environmentally sustainable approach for producing metal-organic framework (MOF) composites. The prepared HPF-MIL-101 exhibited excellent adsorption capabilities for both anionic dye (methyl orange, MO) and cationic dye (methylene blue, MB). The adsorption process followed a pseudo-second-order kinetic model and Friedrich isotherm model, indicating a multilayer adsorption. This is further supported by the Weber-Morris intraparticle diffusion model, which divided the adsorption process into three stages. Furthermore, the adsorption process was consistent with the Freundlich isotherm model, with a correlation coefficient ( r ) greater than 0.96. HPF-MIL-101 can also be used as an adsorbent for solid phase extraction (SPE). Therefore, an SPE method combined with high-performance liquid chromatography (HPLC) was developed using HPF-MIL-101 as the adsorbent to analyze five fluoroquinolones (FQs) in water samples. This analytical method showed good linearity in the range of 30–2000 ng·mL −1 , with excellent linear correlation coefficient ( r = 0.9991–0.9999), reasonable extraction recoveries ranging from 80.39 to 112.7 % (RSD ≤ 7.9 %), and low limits of detection (8–30 ng·mL −1 ). Overall, the results indicated that HPF-MIL-101 not only had a simple, environment-friendly, and pollution-free preparation process but also can be reused for enrichment and detection of trace FQs in water. Thus, HPF-MIL-101 exhibits immense application potential in environmental pollutant removal and also provides a valuable reference for the preparation and application of other MOF composites.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
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IF 8.4
Tianrui Xu,Guanghui Wang,Xuewen Zhang,Nansheng Deng
Within the domain of animal husbandry, the misuse of antibiotics in conjunction with elevated levels of heavy metals in feed has led to the contamination of agricultural soils with these metals and antibiotics. In this study, S-scheme heterojunction photocatalyst, BiFeO 3 /Cl-g-C 3 N 4 , was synthesized for the photochemical remediation of tetracycline (TC) and Cr(Ⅵ) in co-contaminated soil, utilizing pyrolysis methods. Following an 8-h photocatalytic reaction, 89.6 % of TC and 75.7 % of Cr(Ⅵ) were effectively removed in soil with the application of BiFeO 3 /Cl-g-C 3 N 4 at a mass ratio of 5 %. The diversity of microbial communities in the remediated soil increased, with a shift in dominant genera from redox bacteria to nutrient bacteria associated with carbon and nitrogen cycling. Moreover, the incorporation of BiFeO 3 /Cl-g-C 3 N 4 in the remediation of soil contamination at depths ranging from 0 to 20 cm resulted in reductions of 40.2 % and 50 % in TC and Cr(Ⅵ) concentrations in subsoil layers, respectively, after 21-days of sunlight irradiation. In comparison to the contaminated group soil, soil from the remediation treatment demonstrated increased growth potential for cabbage and spinach. This work definitely demonstrates that this soil photochemical remediation method based on BiFeO 3 /Cl-g-C 3 N 4 is technologically feasible and has immense potential in the application of remediation of organic pollutants and heavy metals co-contaminated soils.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Xiangyu Wang,Fei Ge,Ping Ning,Zhiling Guo,Peng Zhang,Lisi Wu,Iseult Lynch
For facile fabrication of environmentally friendly nanoparticle film carriers, the present study utilized sodium periodate to oxidize and induce the self-crosslinking of konjac glucomannan (KGM) and guar gum (GG). Innovatively, the film preparation process involves refrigerated air-drying technique to simultaneously achieve interface modification. The dendritic structure and swelling characteristics produced by the refrigerated air-drying technique significantly increased the specific surface area and improved the dispersion and loading of NZVI. The biodegradable and swell-hydrolyzable characteristics of KGM-GG enabled the green treatment of the carriers. To evaluate the performance of the film, a composite material with highly dispersed nanoscale zero-valent iron (NZVI) was prepared to remove Cr(Ⅵ) in a wide pH range, especially under strongly acidic media. At room temperature and pH 2.0, Fe 0 /KGM-GG loaded with 1.2 mg of NZVI could completely remove Cr(Ⅵ) within 60 min. By characterization analysis, this rapid removal may be achieved by synergistic interactions such as adsorption, reduction, co-precipitation, and formation of bidentate-mononuclear complexes. The results showed that Fe 0 /KGM-GG had a good anti-interference ability in the presence of HA and coexisting ions. In this study, a new method for preparing environmentally friendly nanoparticle carriers with high loading and high dispersion through polysaccharide self-crosslinking and refrigerated air-drying film-making technology has been proposed, which provides a new way for green and sustainable synthesis of nanoparticle carrier materials.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Dezhi Yang,Qiulan Li,Sai Kumar Tammina,Zhe Gao,Yaling Yang
The construction of highly efficient nanozyme activities in a simple means is vital for the wide biological and chemical applications. Present work describes a Cu-based carbon dots (Cu-CDs) with oxidase- and peroxidase-like activity for the catalytic oxidation of o -phenylenediamine (OPD) at neutral pH. The peroxidase-like activity of Cu-CDs was finely tuned and enhanced by changing the ascorbic acid (AA) content and reduction temperature to increase the Cu + content. The oxidation of OPD was significantly accelerated by the addition of Fe 2+ ions (i.e., Cu-CDs + Fe 2+ /H 2 O 2 system) and presented a smaller K m (Michaelis constant) and a higher V max (maximum rate) than horseradish peroxidase (HRP) at the same mass concentration. The Cu-CDs with oxidase- and peroxidase-like activities could catalyze to produce the superoxide radical ( · O 2 - ) and hydroxyl radical (·OH) in the system. Interestingly, the catalytic oxidation of OPD to 2,3-diaminophenazine (DAP) could be inhibited by Cr(III) ions in Cu-CDs + Fe 2+ /H 2 O 2 system. Therefore, a new fluorescent detection strategy was developed for the detection of Cr(III) with the linear range of 0.2−100 μM, and the detection limit of 36 nM (S/N = 3). This work provides new insight into the mechanism and kinetics of low-valence copper–carbon dots peroxidase-like and Fenton co-catalyst system.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Xinqian Li,Bo Li,Shuqi Li,Yaping Dong,Dandan Gao,Zhengrong Niu,Wu Li,Haitao Feng
Removing impurities from hexavalent chromium system without secondary pollution is the key to the successful development of green chromate production technology. Here, hydrated chromium oxide CrO x (OH) 3-2x with lamellar cluster microsphere structure was prepared by in-situ hydrothermal method and used to simultaneously adsorb Si (IV) and V (V) in high concentration Cr (VI) solution. In the in-situ hydrothermal process of pH 7, 160 ℃ for 8 h, the Si (IV) and V (V) removal rates of the actual chromate production Na 2 Cr 2 O 7 -Na 2 SiO 3 -NaVO 3 -H 2 O solution can reach 92.27 % and 94.81 %, respectively, which is higher than the ex-situ removal efficiency of Si (IV) (62.88 %) and V (V) (63.16 %) under the same conditions. Further characterization of STEM-elemental mapping, XPS and FT-IR results indicate that during in-situ adsorption, Si (IV) and V (V) are mainly adsorbed on the surface of CrO x (OH) 3-2X adsorbent by interacting with surface hydroxyl groups. More importantly, the simultaneous formation and adsorption of the adsorbent are more conducive to the full utilization of active adsorption sites on the adsorbent surface. After that, CrO x (OH) 3-2x was converted into nano Cr 2 O 3 with a purity of 97.87 % by simple desorption and calcination processes. In addition, the results of UV–vis DRS and SEM show that the residual Si and V elements in Cr 2 O 3 unexpectedly increase the size of the particles to about 300 nm, which redshifts the absorption band of the blue region by 3.3 nm. This results in more red absorption and makes Cr 2 O 3 more yellowish-green and exhibits excellent pigment properties. Thus, the in-situ synthesis, synergistic adsorption and green conversion of trivalent chromium adsorbent provide a promising and sustainable technology for the purification of high concentration Cr (VI) solution that avoids the discharge of Cr (VI) containing slag.
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高影响因子
MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Li Yang,Shuang Wang,Zhongshui Xie,Rongrong Xing,Runqin Wang,Xuan Chen,Shuang Hu
A novel deep eutectic solvent - loaded magnetic solid phase extraction (DES-L-MSPE) method was proposed, which was based on the direct loading of a hydrophobic DES composed of L-menthol and lactic acid (1:2) into the pores of core–shell magnetic Fe 3 O 4 @MIL-101(Cr) nanoparticles. The function of DES was to condition the Fe 3 O 4 @MIL-101(Cr) and promote liquid phase microextraction for the analytes. Through coupling with HPLC-UV analysis, this method was utilized for the determination of six non-steroidal anti-inflammatory drugs (NSAIDs), including ketoprofen, naproxen, flurbiprofen, diclofenac sodium, ibuprofen, and mefenamic acid in environmental water samples. The influencing parameters such as type and ratio of DES, amount of adsorbent, sample solution pH, salt concentration, extraction time, elution solvent and time were investigated and optimized in detail. Under the optimal conditions, the method exhibited good linearity (5.0–1000 μg/L for ketoprofen, ibuprofen, 1.5–600 μg/L for flurbiprofen, mefenamic acid, 2.5–1000 μg/L for naproxen and 3.0–600 μg/L for diclofenac sodium with the correlation coefficients ranging from 0.9972 to 0.9993), low limits of detection (0.20–1.1 μg/L), and high precision (RSD < 8.2 %). Besides, the recoveries in spiked lake and river water samples were 89.8 %–110.4 % and 83.8 %–109.0 %, respectively. Taken together, the established method was proved to be simple, fast, highly sensitive and accurate for the determination of NSAIDs from aqueous matrices.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
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IF 3.261
Sai Kumar Tammina,Yaling Yang
Here in, the fluorescent nitrogen doped carbon dots (N-CDs) were synthesized by microwave digestion method using glucosamine and ethylenediamine as raw materials for carbon and amine sources. Correspondingly, N-CDs formation was further confirmed through XPS, XRD, TEM and FT-IR techniques. And the optical properties were further investigated using fluorescence and UV–vis spectrophotometry. The synthesized N-CDs were used to explore its sensing ability against 4-nitrophenol (4-NP), Cr(VI), and Ascorbic acid. The sensing strategies of 4-NP, Cr(VI) and Cr(VI)/ascorbic acid had showed the promising detection limits such as 0.05, 0.08 and 0.15 μM respectively. The investigation related to the fluorescence emission quenching of N-CDs against 4-NP and Cr(VI) were attributed to the inner filter effect (IFE), however in case of AA sensing strategy, it was due to the weakening on IFE, results in restoring of fluorescence emission from 0.25 to 175 μM concentration range of AA against N-CDs/Cr(VI) fluorescent probe. Whereas to assess the practicality of the detection strategy, real sample analysis was also performed, which showed the acceptable rates of recoveries and relative standard deviations towards N-CDs/Cr (VI) and N-CDs/Cr(VI)/AA probes. All in all, the reported N-CDs can be utilized in environmental and biological applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Hao Wang,Shuai Wang,Shixing Wang,Likang Fu,Libo Zhang
The removal of Cr(VI) and Pb(II) from wastewater is one of the methods to ensure water safety. However, it is still a difficult point to design efficient and selective adsorbent. In this work, Cr(VI) and Pb(II) were removed from water by a new metal–organic frameworks material (MOF-DFSA) with numerous adsorption sites. The max adsorption capacities of MOF-DFSA were 188.12 mg/g for Cr(VI) after 120 min and 349.09 mg/g for Pb(II) within 30 min. MOF-DFSA showed good selectivity and reusability after four cycles. The adsorption of MOF-DFSA was an irreversible process with multi-site coordination, and an active site adsorbed 1.798 Cr (VI) and 0.395 Pb (II). Kinetic fitting showed that the adsorption was chemisorption and surface diffusion was the main limiting step. Thermodynamic showed that Cr(VI) adsorption was enhanced at higher temperatures by spontaneous processes while Pb(II) was weakened. The chelation and electrostatic interaction of the hydroxyl and nitrogen-containing groups of MOF-DFSA with Cr(VI) and Pb(II) is the predominant mechanism, while the reduction of Cr(VI) also play an important role in adsorption. In conclusion, MOF-DFSA was a sorbent that can be used for the removal of Cr(VI) and Pb(II).
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Shujuan Zhang,Yanpeng Mao,Jian Sun,Tinglu Song,Zhanlong Song,Xiqiang Zhao,Wenlong Wang
In this research, N, Cl doped carbon quantum dots (CQDs) with triple-fluorescence centers was prepared by one-pot solvothermal method from waste traditional Chinese medicines as the raw material. The obtained N, Cl doped CQDs showed purple, yellow and red fluorescence under the 326, 380 and 578 nm excitation, respectively, of which red fluorescence was induced by the increase of concentrations and sensed rapidly water contents in 30–100% range with a limited of detection (LOD) of 0.65%. The obtained CQDs was applied for sensing Cr (Ⅵ) by triple channels, which exhibited the high selectivity and sensitivity for Cr (Ⅵ) with the LOD of 0.28, 0.87 and 0.90 μM, respectively. And its derivative materials exhibited the good linear range with 10–100 μM and 5–250 μM taking purple fluorescence as the response signal, respectively. The recoveries of N, Cl doped CQDs in tap water and sludge were in 93–110% range, suggesting a feasible avenue for accurate and rapid sensing of Cr (Ⅵ).
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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IF 2.931
Shengmei Song,Fan Liang,Minglu Li,Fangfang Du,Wenjuan Dong,Xiaojuan Gong,Shaomin Shuang,Chuan Dong
A fluorescent sulfur and nitrogen dual-doped carbon dots (S,N-CDs) was prepared by a simple and one-step acid-base neutralization and exothermic carbonization method. Hexavalent chromium (Cr(VI)) could effectively quench the fluorescence of S,N-CDs based on inner filter effect (IFE) and dynamic quenching, whereas ascorbic acid (AA) could recover the fluorescence of S,N-CDs/Cr(VI) because of IFE weakening. So an “on-off-on” and label-free nano-probe consecutive determination of Cr(VI) and AA was constructed. This nano-probe system demonstrated excellent selectivity and sensitivity to Cr(VI) and AA with linear range of 0.065–198 μmol/L (3.38–10,296 μg/L) and 6.6–892 μmol/L (1.16–157 mg/L), respectively. Meanwhile, the as-prepared S,N-CDs possess low toxicity and could be used for multi-color cell imaging in SMMC 7721 cells. More importantly, this nano-probe was successfully employed for detection of Cr(VI) in tap water and AA in food samples. In view of its simple detection condition, rapid response, wide linear range, low detection limit and inexpensive instrument, the as-constructed nano-probe system could have a wide range of potential application, including water quality monitoring and evaluation, food inspection and testing and biomedical analysis.
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