SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Yabin Wang,Ronghao Wang,Xiuping Ding,Hua He
Hexavalent chromium has seriously destroyed the natural environment and threatened human health. It is crucial but still challengeable to dispose of Cr(VI) handily and recycle the as-generated Cr-based byproducts. Herein, on the one hand, we demonstrate a feasible strategy for cyclic utilization of Cr(VI) species by converting them from toxic to trash and further to treasure. Multiamino-functionalized dendritic mesoporous silica nanoparticles (DMSNs) can adsorb chromium oxyanion ions (HCrO 4 − and Cr 2 O 7 2– ) and in situ reduce Cr(VI) to Cr(III). The as-obtained DMSNs-Cr(III) function as supported catalysts and efficiently catalyze some cross-coupling reactions. On the other hand, pore-size-dependent adsorption of HCrO 4 − and Cr 2 O 7 2− has been realized by regulating DMSNs’ channel size. Furthermore, pore-size-dependent adsorptive and catalytic performances have been demonstrated as well. Our results not only provide a blueprint for cyclic utilization of Cr(VI) in sewage, but also exhibit a versatile DMSNs-based platform that couples with potential structure–activity correlations.
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高影响因子
CERAMICS INTERNATIONAL
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2024
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IF 5.1
Kai Lv,Xu Liang,Qinglin Yao,Liangmiao Zhang,Zongtao Zhang,Yanfeng Gao
This work reports a series of yellow-green near-infrared (NIR) reflective pigments, Ba(Mg 6-x-y Zn y Ti 6-x Cr 2x )O 19 (x = 0–1.0, y = 0–2.5), with strong NIR reflectivity for solar thermal energy regulation. Comprehensive analyses were carried out to characterize the obtained pigments including X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, UV–Vis–NIR spectrophotometry, and CIE L*a*b* color measurement. Absorption spectra of Ba(Mg 6-x Ti 6-x Cr 2x )O 19 showed that the yellow-green absorption is attributed to the octahedrally coordinated Cr 3+ with d-d electron transitions of 4 A 2 (F)→ 4 T 1 (F) and 4 A 2 (F)→ 4 T 2 (F). However, their broad absorption peak centered at 1200 nm severely deteriorated the insulating properties of the pigments. Through substituting Mg with Zn, the obtained pigment Ba(Mg 2.5 Zn 2.5 Ti 5 Cr 2 )O 19 showed an excellent NIR solar reflectance (R* = 67 %) with color performances (L* = 61.98, a* = −18.72, b* = 22.23). EnergyPlus simulation results show that for a warm city (Haikou), the Ba(Mg 2.5 Zn 2.5 Ti 5 Cr 2 )O 19 coating for the external surface of a model house (TSR = 35 %, R* = 55 %) can reduce annual cooling energy consumption by 8 % of the house.
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INTERNATIONAL BIODETERIORATION & BIODEGRADATION
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2024
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IF 4.1
Liwen Zhang,Luyao Xi,Shuyu He,Huizi Wen,Shanyi Tan,Shaohua Chen
Bioremediation has garnered considerable interest due to its advantages of economy and no secondary pollution. However, the direct electron transfer rate between microorganisms and Cr(VI) is low. The bioreduction of Cr(VI) by Shewanella oneidensis MR-1 ( S. oneidensis ) in the presence of formylmethylflavin (FMF) was conducted to understand how FMF mediated the extracellular electron transfer process to improve Cr(VI) removal. In this study, FMF was firstly synthesized by modifing RF to increase its solubility and redox activity. The findings indicate that S. oneidensis /FMF exhibited better Cr(VI) removal performance compared to that of S. oneidensis . Under optimum conditions, 40 mg/L Cr(VI) could be completely removed by S. oneidensis /FMF within 120 h, while only 48.6% of Cr(VI) was removed by S. oneidensis , and the first order rate constant (k) for the Cr(VI) elimination by S. oneidensis /FMF (0.033 h −1 ) was about 4.1-fold greater than that of S. oneidensis (0.008 h −1 ). Moreover, the removal of Cr(VI) by S. oneidensis /FMF were dominated by reduction, and supplemented by adsorption and complexation. FMF enhance the extracellular electron transfer rate (EETR) was confirmed by electrochemical cyclic voltammetry (CV) and linear scanning voltammetry (LSV) experiments. This study emphasizes the potential important role of FMF in environmental bioremediation.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2024
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IF 3.7
Zhi Hu,Jiahong Wang,Tongtong Sun
A novel tetraethylenepentamine (TEPA) functionalized magnetic mesoporous silica adsorbent (FNMs/TEPA) was prepared for adsorption of Cr(III)-EDTA from wastewater. Characterization of the prepared adsorbent certified that TEPA was modified onto the magnetic mesoporous silicon (FNMs), while FNMs/TEPA maintained the ordered mesoporous and pristine magnetic properties. The batch adsorption experiments demonstrated that TEPA significantly enhanced the removal capacity of the adsorbent for Cr(III)-EDTA. FNMs/TEPA exhibited an excellent adsorption property (13.84 mg∙g –1 ) at pH 4.0. Even in the existence of high concentrations of coexisting ions and organic acids, the adsorption performance of FNMs/TEPA was stable. Experimental characterization and density functional theory (DFT) demonstrated that the adsorption of Cr(III)-EDTA was ascribed to the electrostatic interaction, hydrogen bonding, and complexation between Cr(III)-EDTA and amino groups on the adsorbent surface. The analysis of the Independent Gradient Model (IGMH) shown that electrostatic interaction is the main mode of action in the adsorption process. Moreover, FNMs/TEPA demonstrated remarkable reusability in three regeneration cycles. These findings indicated that FNMs/TEPA possessed excellent application prospect in the disposal of wastewater containing Cr(III)-EDTA.
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OPTICAL MATERIALS
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2024
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IF 3.8
Zhiwei Wang,Qiuying Wang,Yi Wang,Theeranun Siritanon,M.A. Subramanian,Peng Jiang
Mg 2.2- x Co x TiO 4 (0 ≤ x ≤ 0.6) and Mg 2.2- x Cr x TiO 4 (0 ≤ x ≤ 0.6) solid solutions with spinel structure were successfully synthesized by solid-phase reaction. Excess MgO was added to achieve the single phase of the compounds. The transition metal ions Co/Cr tune the colors of Mg 2 TiO 4 to intense blue and green, respectively. The root of the observed intense blue color of Mg 2.2- x Co x TiO 4 is attributed to the 4 A 2 (F) → 4 T 1 (P) transition of Co 2+ in tetrahedral coordination. In Cr doped Mg 2 TiO 4 , Cr exists in a mixed oxidation states of +3 and + 6. The green color of the as-synthesized Mg 2.2- x Cr x TiO 4 is attributed to 4 A 2 (F) → 4 T 1 (F) at 410 nm–500 nm and 4 A 2 (F) → 4 T 2 (F) at 610 nm transitions of Cr 3+ . Besides, the Cr 3+ - Ti 4+ charge-transfer transition at 410 nm–500 nm is also the reason why it shows green. The as-synthesized pigments were dispersed into PMMA to prepare blue/green plastics.
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Journal of Water Process Engineering
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2024
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IF 6.3
Junjie Su,Qi Yang,Zhihu Zhang,Ziyue Zhang
Nowadays, Ni/Fe bimetallic nanocomposites have shown great potential for removing Cr(VI). However, the action of Ni 0 in Cr(VI) removal is still controversial, which was studied in this work. In this study, Ni/Fe@Fe 3 O 4 -g-C 3 N 4 (NFFOCN) nanocomposites were applied to remove Cr(VI) from aqueous solutions and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and other methods. Batch experiments were conducted to evaluate the Cr(VI) removal performance. Experimental results demonstrated that under optimal operating conditions (pH 5.5, 10 mg/L Cr(VI), 0.3 g/L NFFOCN, 30°C), a Cr(VI) removal efficiency of 90.78% was achieved within 50 min. Theoretical maximum adsorption capacity was calculated to be 36.101 mg/g. Combining experimental and characterization results, it could be concluded that Cr(VI) removal was attributed to the synergistic effect of the NFFOCN components. Ni 0 not only participated directly in the reduction of Cr(VI) as an electron donor, but also converted the corrosion product H 2 of nano-zero-valent iron (nZVI) into highly reducible atomic hydrogen (·H) to remove Cr(VI). Additionally, Ni 0 could form a primary battery with nZVI, facilitating the electron transfer between nZVI and Cr(VI). NZVI and its derivatives, Fe 2+ ions and green rust, were responsible for Cr(VI) reduction. Furthermore, the presence of Fe 3 O 4 and carbon nitride (g-C 3 N 4 ) improved the stability and reactivity of the nanocomposites.
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高影响因子
OPTICAL MATERIALS
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2025
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IF 4.2
Wei Tan,Fengdi Fang,Xingbao Han,Lan Cheng,Pengli Zuo
As a new kind of fluorescent nanomaterial, carbon dots (CDs) have gained considerable focuses in regulating and improving their intrinsic properties. Some effective methods have been proposed and validated, like surface passivation and heteroatom doping in CDs. Herein, we have facilely fabricated the fluorescent nitrogen, silicon co-doped carbon dots (N,Si-CDs) by a one-pot solvothermal approach. N-[3-(Trimethoxysilyl)propyl]ethylenediamine and citrate were adopted as precursors for nitrogen, silicon, and carbon sources, respectively. Correspondingly, the formation of N,Si-CDs was affirmed via TEM, FT-IR, and XPS techniques. Further analysis of the optical properties was conducted using UV-vis spectrophotometry and fluorescence spectroscopy. Lastly, the prepared N,Si-CDs were utilized to investigate their sensing ability for rifampicin and Cr(Ⅵ) as well as photothermal effect. The detection linear range of this sensing probe for rifampicin was 0–18 μM, achieving the detection limit of 0.02 μM, besides the detection linear range for Cr(Ⅵ) was 0–130 μM, reaching the detection limit of 0.15 μM. Furthermore, the photothermal conversion efficiency (PCE) of N,Si-CDs was explored and calculated to be 43.45% with a favorable photothermal effect. Collectively, this research will provide novel insights for fluorescence sensing strategies and explore new proposals to develop CDs-based photothermal agents (PTAs) for cancer photothermal therapy (PTT).
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Zhiru Wang,Meng Su,Chanjuan Wang,Yuxin Wang,Ying Liu,Xiaoshuang Yin,Wenzhong Yang,Hui Xu
A robust composite hydrogel (i.e., ZnO@(CNC- g -PAA/PEI)) integrating cellulose nanocrystal-grafted polyacrylic acid/polyethyleneimine with uniformly dispersed ZnO nanoparticles (NPs) was synthesized through dual chemical-physical cross-linking strategies. This multifunctional hydrogel synergistically combines adsorption and photocatalytic reduction for efficient Cr(VI) removal, exhibiting exceptional stability, recyclability, and performance. Systematic optimization revealed that pH, ZnO loading, adsorbent dosage, and contact time critically influenced removal efficiency. Under optimal conditions (pH at 3, 15 wt% ZnO loading, 100 mg/L Cr(VI), 0.5 g/L adsorbent), a remarkable 99.03 % Cr(VI) removal was achieved. The enhanced efficacy arises from three synergistic features: (1) a 3D porous architecture enabling rapid Cr(VI) diffusion, (2) abundant protonated amine groups for electrostatic adsorption, and (3) homogeneously distributed ZnO NPs minimizing aggregation and maximizing photocatalytic activity. Simulated light irradiation triggered Cr(VI)-to-Cr(III) reduction, regenerating active sites and amplifying removal capacity. Kinetic analyses confirmed pseudo-second-order adsorption. The hydrogel retained 94.75 % efficiency after five cycles, demonstrating robust reusability. This work provides a scalable strategy for designing hydrogel-based adsorbent-photocatalyst hybrids, offering a sustainable solution for chromium-laden wastewater remediation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Lingling Zhou,Ao Qu,Jing Guo,Zhanxiang Zhang,Hongru Li,Yanhui Zhao,Zhe Zhang,Xudong Yang
Developing solid-state red light–emitting carbon quantum dots (CQDs) with high photothermal stability remains a key challenge in this field. This study successfully constructed a new dual–function fluorescent nanocomposite material (RCDs@ZIF-8) by encapsulating 4,4-dihydroxybenzophenone and o-phenylenediamine-derived red fluorescent carbon quantum dots in ZIF-8 metal–organic frameworks. The porous structure of ZIF-8 effectively confines RCDs, significantly improving their photostability and fluorescence specificity, and successfully imparting them with intense red solid–state fluorescence. The RCDs@ZIF-8 composite material exhibits extremely high red fluorescence intensity in a solid state and can be used as an efficient, ratio–type fluorescent probe. In solution, it exhibits a highly selective fluorescence quenching response to Cr 6+ ions with a detection limit of 0.49 μM, making it suitable for the rapid, visual detection of trace amounts of Cr 6+ in environmental water samples. More importantly, the strong solid-state fluorescence of this material enables the high-contrast visualization of latent fingerprints, with clear and distinct fingerprint lines. RCDs@ZIF-8 integrates efficient solution sensing (Cr 6+ detection) and high–performance solid-state light emission/imaging (fingerprint identification, optical applications) in a dual-function manner. It has a wide range of applications in environmental monitoring, forensic identification, and optical anti–counterfeiting.
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高影响因子
IONICS
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2025
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IF 2.6
Yang Jian,Zhang Yaowen,Liu Yongping
The oxygen evolution reaction (OER), serving as the anode in water electrolysis, plays a pivotal role in various applications. Developing efficient non-iridium-based catalysts for acidic water splitting remains a significant challenge. This study employs a phase engineering strategy to synthesize defect-rich crystalline/amorphous Ru 0.6 Mo 0.2 Cr 0.2 O x solid solution catalysts through dual-metal doping. The catalyst exhibits superior acidic OER performance with an overpotential of 204 mV (@10 mA cm −2 ) and mass activity of 577.8 A g Ru −1 at 1.5 V vs RHE, outperforming all control samples. Furthermore, synergistic Cr/Mo doping effectively reduces the oxidation state of Ru in RuO 2 while enhancing structural stability, resulting in minimal activity decay during prolonged testing. Theoretical calculations reveal that dual-doping synergistically modulates charge distribution on Ru sites, lowering the energy barrier for *OOH formation in the thermodynamic limiting step. This work provides a facile strategy for developing high-performance acidic OER catalysts with dramatically reduced noble metal loading, demonstrating critical industrial relevance.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
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IF 4.6
Jiaqi Wang,Yuan Fu,Dong Liang,Jiangbo Pan,YiChang Jing,Changhe Liao,Di Wang,Shuangying Wei,Chengyu Wang,Jian Li
Carbonized polymer dots (CPDs), a new nanofluorescent materials inheriting the advantages of CDs, have been widely studied for their excellent physicochemical stability and tunable fluorescence properties, and have extensive application in the fields of optoelectronic devices and environmental monitoring. In this study, nitrogen-doped CPDs (CMC-M-CPDs) were synthesized via hydrothermal reaction using carboxymethyl cellulose (CMC) and melamine (M), which allowed N doping to improve the luminescence of CPDs through cross-linking and reduction of the energy gap. Due to the excitation-dependent, the luminescence wavelength of CPDs can be tuned, so these CPDs exhibit two optimal emission centers in the fluorescence spectra, which originate from the carbon core and the surface, respectively. A significant quenching effect on the luminescence of CMC-M-CPDs at 457 nm and 515 nm was exhibited due to static quenching of Cr(VI). Therefore, dual-channel fluorescence detection of Cr(VI) can be achieved, allowing detection using both excitation wavelengths to be carried out concurrently and mutually verified in complex environments. This improves the accuracy of detection, with limits of detection (LOD) of 60.15 nM and 93.95 nM, respectively. The CMC-M-CPDs demonstrate excellent selectivity and anti-interference in the detection of Cr(VI), with a quenching response occurring within 1 s. This dual-channel fluorescent probe can also be applied for sensitive detection in tap water and Songhua River water. Furthermore, the fluorescence of quenched CPDs can be restored by adding ascorbic acid (AA), achieving a maximum recovery efficiency of 96.6 %.
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Ziwei Ma,Jingyi Wang,Wei Wang,Xueyi Song,Yating Liu,Shaobin Wang,Yunjin Yao
We engineered a NiSe/Ni₃Se₂ heterostructure on nickel foam that activates formic acid for rapid hexavalent chromium detoxification. We used one-step hydrothermal growth and probed structure and mechanism by diffraction and spectroscopy, electron microscopy, electron paramagnetic resonance with 5,5-dimethyl-1-pyrroline N-oxide, and batch and fixed-bed tests. The optimized catalyst removed 99.7% of 50 mg L⁻¹ hexavalent chromium in 40 minutes at 25 °C, achieved full removal of 1 mg L⁻¹ in 20 minutes, tolerated common ions, and maintained 100% removal for 180 h in continuous flow. Mechanistic analyses show a radical pathway dominated by hydrogen radicals (H ⁎ ) and carbon dioxide radical anions ( C O 2 • − ), promoted by selenium vacancies and tightly coupled nickel selenide interfaces that accelerate formic-acid activation and interfacial charge transfer. Operating without external energy input, this monolithic architecture avoids powder recovery and minimizes pressure drop and cost, offering a general route to defect-engineered selenides for efficient, low-cost environmental redox remediation.
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