JOURNAL OF FLUORESCENCE
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2026
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IF 3.1
Zhao Tingting,Wang Yuanyuan,Chen Dechao,Zhang Ping,Hu Xue
Copper nanoclusters (Cu NCs) have promising applications in fluorescence sensors due to their excellent optical properties. However, their efficient application in point-of-care testing (POCT) remains a challenge due to the limited development of solid-state fluorescence platforms. In this study, a POCT platform for Cr(Ⅵ) was fabricated based on a Cu NCs hydrogel by assisting of a smartphone. The Cu NCs hydrogel was facilely synthesized by integrating cysteine (Cys)-Cu NCs into agarose- hydrogel via a self-assembly process. The prepared Cu NCs hydrogels display more stronger emission at 600 nm and stability. Moreover, the fluorescence of the Cu NCs hydrogel could be selectively quenched by Cr(Ⅵ) with the fluorescence color change from red to blue. With the assistance of a smartphone, a solid-state fluorescence platform could be developed based on the Cu NCs hydrogel directly for POCT of Cr(Ⅵ). The fluorescence color change was transduced into the RGB that displayed two linear relationships to Cr(VI) concentration between 1-10 and 10-1000 µM, with a detection limit of 1 µM. This platform also displayed great anti-interference ability and reproducibility, and was successfully used for quantifying Cr(Ⅵ) in real water samples. This study demonstrates the application potential of Cu NCs hydrogel in POCT.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Dongmei Jia,Yuejin Li,Huamin Cai,Yongzheng Duan,Jing Li,Chen Ling
Capture of heavy metal ions from aqueous solutions is a critical but challenging step in environmental treatment. In this work, NH2-MIL-101(Fe) nanoparticles were synthesized by simple solvothermal methods and applied to capture Cr(VI) anions from aqueous solutions. The results revealed that NH2-MIL-101(Fe) exhibited a high capture capacity (375.2 mg g–1) and an ultrafast capture rate (4 min reaching equilibrium). The competitive effects of coexisting ions such as Cl–, HCO3–, PO43–, Cd2+, Ca2+, and Cu2+ on Cr(VI) are very weak, suggesting that the adsorption selectivity significantly enhanced by loading amino groups on MIL-101(Fe). Density functional theory (DFT) calculation was performed to better understand the adsorption mechanism of Cr(VI), showing that the amino groups could increase the adsorption energy of Cr(VI) for enhancing the adsorption capacity. Based on powder X-ray diffraction, X-ray photoelectron spectroscopy, and DFT calculations, the Cr(VI) capture mechanism by NH2-MIL-101(Fe) nanoparticles was a combination of coordination between Fe and Cr(VI), electrostatic interaction between Cr2O72– and the protonated amino group, and reduction of Cr(VI) to Cr(III).
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
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IF 6.2
Ming Li,Xi Chen,Jinjin He,Shucheng Liu,Yi Tang,Xiaogang Wen
Hierarchical NiCo-LDH microspheres (NiCo-LDHM) were synthesized via a simple one-step hydrothermal process in the presence of 2-methylimidazole, and a freeze-drying technique was subsequently used to further adjust its microstructure. The obtained porous hierarchical microspheres are about 5 µm in average diameter, and consist of ultrathin nanosheets with an average thickness of 5 nm. The freeze-drying endows LDH microspheres with higher surface area and improved pore structure . The unique hierarchical porous structure, high specific surface area and positive surface charge together contribute NiCo-LDHM’ excellent capability for anionic dyes and heavy metal ions removal, its theoretical adsorption capacities for Congo red (CR), acid fuchsin (AF) and Cr(VI) are 2120, 1176 and 123 mg/g at room temperature respectively. The adsorption of pollutant molecules/ions onto NiCo-LDH microspheres conforms to the quasi-secondary kinetics model. Isotherm studies suggest that the CR adsorption onto adsorbent fits Langmiur model, while AF/Cr(VI) adsorption fits Freundlich model, indicating that the size and morphology of pollutant molecules influence the adsorption process . The adsorption is a spontaneous endothermic process and NiCo-LDHM demonstrates good recyclability, the removal rates of CR, AF and Cr(VI) can still reach 90.7%, 84.7% and 82% after five cycles, respectively. In addition, NiCo-LDH hierarchical microspheres also exhibit good anionic selective adsorption capacity in mixed-dye systems, displaying great potential for water restoration and dye recycling.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Yongli Shi,Jie Feng,Zhaoxin Zhang,Ningning Cao,Jiahao Li,Heping Li,Linji Li,Quanxian Hua,Qun Ma,Kai Zhang
Polypyrrole-based adsorbents have emerged in removing Cr(VI) from wastewater based on their reduction, chelation, electrostatic attraction and ion exchange. However, it is still a formidable challenge to remove metal cations simultaneously due to electrostatic repulsion. In fact, metal ions originating from industrial activities such as chemical manufacturing and metal electroplating are always complex and multifarious. Here, we report a EDTA-crosslinking-chitosan/polypyrrole composite (EDTA-CS/PPy) with multiple types of adsorption sites (carboxyl, hydroxyl, amino), successfully realizing simultaneous removal of Cr(VI) anions and other metal cations. The maximum adsorption capacities of Cr(VI), Cu(II), Pb(II) and Cd(II) reach up to 401.25, 59.03, 77.81 and 68.31 mg/g, respectively. The adsorption mechanism is attributed to coupling interactions of the reduction, chelation, electrostatic attraction and ion exchange between targeted metal ions and EDTA-CS/PPy, investigated by experiments and DFT theories. Notably, the adsorption capacity of EDTA-CS/PPy keeps stability after three adsorption–desorption cycles. These findings may promote potential applications of EDTA-CS/PPy adsorbents in highly efficient treatment of coexisting toxic metal ions from wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Tianyu Yang,Yue Zhou,Jiamin Qi,Bin Li,Zewei Liu
Discharging pollutants containing toxic metal ions has become a global problem, and improper disposal of coffee grounds can also cause environmental pollution. In this work, 1T-MoS 2 @STC (Solvothermal Carbonization, STC) was prepared from coffee grounds and molybdenum disulfide by a one-step solvothermal method that is simple in operation, low in energy consumption and low in cost, which possesses efficient adsorption of Cr (VI) in wastewater. The 1T-MoS 2 @STC was characterized by SEM, TEM, XRD, XPS, Zeta potential, FTIR, and BET analyses. The results showed that MoS 2 was successfully loaded on coffee grounds. According to the pseudo-second order (R 2 = 0.99) kinetics model, chemisorption was the main cause of adsorption. The adsorption process followed the Langmuir (R 2 = 0.99) isothermal model, and the maximum adsorption capacity was 795.17 mg/g. The adsorption mechanism can be attributed to electrostatic interaction, redox reaction between Cr (VI) and active sites, and chelation between Cr (III) and hydroxyl. When 1T-MoS 2 @STC was applied to the treatment of actual water samples, the removal rate was also maintained at a high level (90%). In addition, 1T-MoS 2 @STC can maintain long-term stability (90 days) and low leaching of molybdenum (<3 mg/L) in wastewater. Therefore, in the treatment of chromium-containing wastewater, the 1T-MoS 2 @STC composite material simultaneously exhibited significant adsorption capacity, high interference resistance, stability and low leaching rate. This study provides a new efficient and stable Cr (VI) adsorbent and promotes the practical application of MoS 2 biomass derivatives composites in water purification.
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Catalysts
·
2023
·Vol. 13
·期 7
·1073
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IF 3.9
Kaiwen Yuan,Bo Gong,Chundong Peng,Yanmei Feng,Yingmo Hu,Kai Chen,Daimei Chen,Derek Hao
Cr(VI) is a common heavy metal pollutants present in the aquatic environment, which possess toxic and carcinogenic properties. In this study, a solvothermal reaction was used to prepare porphyrin (TCPP)-modified UiO-66-NH2(UNT). The UNT integrated adsorption and photocatalytics in the application for dealing with Cr(VI). The photocatalytic reduction activities of UNT for Cr(VI) were investigated under visible light illumination. We found that the TCPP doping amount of 15 mg UNT (15-UNT) had a 10 times higher reduction rate of Cr(VI) than pristine UiO-66-NH2. The optimal 15-UNT photocatalyst demonstrated the highest photocatalytic activity, and Cr(VI) was completely removed within 80 min. In addition, the introduction of porphyrin not only enhanced the absorption of light but also enabled the transport of photogenerated electrons from porphyrin to UiO-66-NH2, which promoted the separation of charge carriers. Furthermore, the effects of factors such as porphyrin content, pH and light source on the photocatalytic reduction performances of UNT were also explored. Overall, this work presented a possible relationship between the crystal structures and the performance of UNT.Keywords:photocatalytic reduction;porphyrin;UiO-66-NH2;hexavalent chromium
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Membranes
·
2023
·Vol. 13
·期 7
·651
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IF 4.2
Lu Liu,Hongyang Ma,Madani Khan,Benjamin S. Hsiao
To achieve high throughput, low-pressure drops, and high adsorption capacity of Cr(VI) and Pb(II) in industrial wastewater treatment, cellulose membranes containing cationic and anionic groups were fabricated, respectively. In this process, cost-effective cotton fabrics were oxidized using sodium periodate, followed by quaternary ammonium or sulfonation modifications. The chemical composition, surface morphology, and thermal and mechanical properties of the cellulose membranes were investigated by ATR-FTIR, solid-state NMR, SEM, TGA, and tensile experiments. Quaternary ammonium, aldehyde, and sulfonate groups were distributed on the cationic/anionic cellulose fibers as adsorption sites, which issue remarkable adsorption capability to the cellulose membranes. The highly toxic Cr(VI) and Pb(II) ions were used to challenge the adsorption capacity of the cationic and anionic cellulose membranes, respectively. The maximum adsorption capacities of Cr(VI) and Pb(II) ions were 61.7 and 63.7 mg/g, respectively, suggested by Langmuir isotherms, kinetics, and thermodynamics in the static experiments. The dynamic adsorption capability of cationic cellulose membranes against Cr(VI) ions was determined and compared with that of commercially available anionic-exchange membranes. Spiral wound filtration cartridges were fabricated by cationic and anionic cellulose membranes, respectively, and were used to adsorb Cr(VI) and Pb(II) from lab-made wastewater, respectively. The cationic cellulose cartridge can purify 4.4 L of wastewater containing 1.0 mg/L of Cr(VI) ions with a 100% removal ratio, while the pressure drop was retained at 246 Pa. Similarly, the anionic cellulose cartridge exhibited even more impressive adsorption capability; the removal ratio against Pb(II) was 99% when 8.6 L of 1.0 mg/L of Pb(II) ions containing wastewater was treated, and the pressure drop was retained at 234 Pa. A composite cartridge fabricated by the integration of cationic and anionic cellulose membranes was successfully employed to purify the wastewater containing Cr(VI) and Pb(II) simultaneously. The possible adsorption mechanism was proposed, and the recycling ability of the cellulose membranes was also discussed.Keywords:cationic/anionic cellulose membrane;oxidation;adsorption;heavy metal ions;wastewater treatment
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PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
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IF 6.76
Shaojie Wu,Mingyang Li,Lili Xin,Hongming Long,Xiangpeng Gao
Conventional photocatalysts for environmental applications are mainly transitional metal compounds or precious metal nanoparticles, which suffer from weak pollutant adsorption performance, thus limited their applications for high concentrated wastewaters. In this study, asynchronous cross-linked triethylenetetramine modified sodium alginate (CFTS) was used as photocatalyst for the simultaneously catalytic degradation of Cr(VI) and metronidazole (MNZ). Experimental results suggested that asynchronous cross-linking and triethylenetetramine modification have dramatically enhanced the chemical stability as well as the adsorption and photocatalytic behavior of the material. The grafted amino functional groups and cross-linked Fe 3+ ions can promote the rapid separation and transfer of electrons, thus reducing the recombination rate of photo-generated electron-hole pairs. The optimum removal rate of Cr(VI) has reached 99.5 % and MNZ can be completely removed within 20 and 30 min at pH 1.0 under UV light irradiation, respectively. The removal mechanism of Cr(VI) by CFTS is the synergistic effect of electrostatic adsorption and photocatalytic reduction, while photocatalytic oxidation dominated the degradation process of MNZ. Moreover, the removal efficiency can be enhanced in the binary solution of these two pollutants due to the utilization of photo generated electron-hole pairs, which provides new pathways in the treatment of complicated pharmaceutical and domestic sewage wastewaters.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2022
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IF 3.656
Zirui Song,Kai Guo,Wenjuan Bai,Chengchun Tang
Heavy metals in water environment do great harm to the life and health of the public and the stability of the ecological environment. Therefore, it is necessary to find an efficient solution to deal with the increasingly serious problem of heavy metal pollution. In this paper, N, N'-methylene bisacrylamide was loaded on porous boron nitride (pBN) surface with a simple synthesis method using 3-aminopropyltriethoxysilane as a coupling agent for the adsorption of Cr(VI). The prepared adsorbents were characterized with XRD , SEM, TEM , FTIR, XPS , BET, and other analytical methods. We discovered that the capacity of pBN-AS@MBA reached 83.78 mg/g, which was significantly higher than that of pBN, with an initial concentration of 20 mg/L of Cr(VI). Besides, the chemosorption of exothermic spontaneity predominated the entire process, determined from pseudo-second-order kinetics, intra-particle diffusion model, thermodynamics, and Langmuir isotherm. Not only Cr(VI) chemically react with amine groups on the sorbent , but also elicited electrostatic attractions. The reusability of sorbent was proved with a reduction rate of lower than 20%, after a few cycles of running.
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Water
·
2022
·Vol. 14
·期 16
·2507
·
IF 3.53
Jianxin Fan,Liang Qin,Ting Duan,Zenglin Qi,Lan Zou
Biochar (BC) is considered to be a great potential adsorbent to remove various contaminants, but the sorption capacity for chromium (Cr) is predominantly limited for the net negative charge. In this study, BC from rice husk was impregnated with Mn(NO3)2solution to synthesize MnOx-modified BC (MnOBCs) for enhancing Cr(VI) removal in an aqueous solution. MnOBCs were characterized, and MnOx (manganese ore) was found to be the dominant crystal in MnOBCs. Batch sorption and kinetic experiments combined with spectral analysis were carried out to elucidate the sorption capacity and mechanisms of Cr(VI) sorption onto BC and MnOBCs. Results showed that the sorption kinetic process fitted to the Elovich model, and the modification enhanced the sorption capacity of Cr(VI) on BC. Compared to ion strength, pH is the main control factor for Cr(VI) fixed on BC and MnOBCs, and the sorption amount decreased with the pH value increasing. Moreover, X-ray photoelectron spectroscopy results showed that the proportion of Mn(II) decreased from 33.59% to 8.33%, and that of Mn(VI) increased from 30.58% to 52.72% after Cr(VI) sorption on MnOBCs. Meanwhile, the reduction reaction of Cr(VI) occurred during the sorption process on the BC and MnOBCs surface, and the reduction reaction was more obvious on the MnOBCs surface. MnOx loaded in BC can enhance the electrostatic attraction and redox capacity, which can improve the removal of Cr(VI) in an aqueous solution. This study provides information on the sorption and redox of Cr(VI) on BC, and allows us to better understand the mechanism of Cr(VI) removal in solutions by MnOBCs.Keywords:biochar;MnOx;Cr(VI);sorption;redox
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Feifan Yu,Wenkai Song,Zenglong Wu,Wenxian Chen,Jinping Cui,Yuyuan Yao
The removal of heavy metal ions from industrial effluents by molybdenum disulphide (MoS 2 ) has attracted considerable attention, but developing the removal capacity of MoS 2 toward hexavalent chromium ions (Cr(VI)) in wastewater treatment is still a challenge. Herein, a cationic polyacrylamide aerogel (CPAMA) containing -N + (CH 3 ) 3 was creatively introduced as a precursor to synthesize the CPAMA intercalated MoS 2 (MoS 2 @CPAMA). The addition of CPAMA as carrier greatly improved the dispersion and the exposure of active sites of MoS 2 , and even the -N + (CH 3 ) 3 effectively increased the surface potential of MoS 2 , which facilitated the adsorption and reduction for Cr(VI). Notably, MoS 2 @CPAMA removed 95% of Cr(VI) within 50 min and the maximum Cr(VI) removal capacity reached 800.0 mg g −1 at 400 mg L −1 , which was significantly higher than that of MoS 2 (237.1 mg g −1 ) and almost all reported MoS 2 -based materials. The results of ICP-OES and UV–vis spectrophotometer revealed that both reduction and adsorption pathway were participated during the Cr(VI) removal process, while the reduction was obviously dominated. The results of XPS showed that the -N + (CH 3 ) 3 and amide groups played a significant role in adsorbing Cr(VI) onto the MoS 2 @CPAMA surface, and the Mo was oxidized from Mo 4+ to Mo 6+ and the S 2− was oxidized into S 6+ subsequently during the reduction of Cr(VI). Interestingly, MoS 2 @CPAMA could also be used as a co-catalyst in the Fe 2+ /PMS system, and the TOC removal rate of 67% in 60 min and the retention rate of 80% for Fe 2+ were achieved. Notably, MoS 2 @CPAMA possessed high durability in the co-existing cations and anions, and the 4-CP removal rate was still as high as 94% after four consecutive cycles, indicating the splendid reusability of MoS 2 @CPAMA. This study offers new insights into the development of multifunctional MoS 2 -based materials for wastewater treatment.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Li Song,Yixing Qiu,Xi Zhang,Fuqiang Liu,Aimin Li
A green strategy involving photocatalysis unit (PU) and adsorption unit (AU) using sodium polyacrylate hydrogel (PAAS) was proposed to achieve high iron utilization in efficient Cr(VI) removal. In PU, the novel process of light-controlled sustained release (LCSR) led to the increased utilization of Fe(II). Meanwhile in AU, the highly selective recovery of Fe(III) was achieved due to the larger complexation rate. Specifically, the LCSR process in PU was implemented by PAAS loaded with Fe(III) (PAAS-Fe), which generated Fe(II) to reduce Cr(VI) via ligand–metal charge transfer (LMCT) reaction. And the utilization of Fe(II) was up to 95.30%, meanwhile 45.85% of generated Fe(III) participated in the coordination with PAAS to maintain LMCT reaction. The treatment capacity via LCSR process in fluidizer reached about 14,400 and 13000 mL/g for simulated and real effluent, respectively. In AU, the selective separation factor of Fe(III) was 42.75 and iron recovery ratio was 98.01%. Furthermore, PAAS in AU loaded with Fe(III) could be reused as photocatalyst by switching the light. The chemicals cost of the strategy was reduced by 93.90%-98.25% compared with other reductants. In general, PU-AU strategy is efficient and eco-friendly for Cr(VI) removal, which seeks a sustainable way with lower chemical consumption.
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