JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Yun Guo,Hong-Yi Li,Shuo Shen,Jie Cheng,Jiang Diao,Bing Xie
Chromium sludge is a hazardous solid waste which cannot be effectively treated but only piled up and abandoned, causing serious environment pollution and resource wasting. This work proposes an effective novel process to separately recover all resources in chromium sludge via a sustainable way. The obtained acid solving liquid from chromium sludge is desiliconized by cationic flocculant (PCAM) to induce coprecipitation of polysilicate gel and PCAM , which mixture is calcinated to generate the product of white carbon black in purity of 94.35% with a recovery of 92.58%. After desiliconization, V in the solving liquid is selectively extracted by microemulsion (ME), which is recovered as V 2 O 5 in purity of 99.34% with a recovery of 95.53% by the subsequent procedure of stripping-precipitation-calcination. The Fe 3+ in raffinate is reduced to Fe 2+ cations by Na 2 SO 3 , and is then recovered by H 2 C 2 O 4 precipitation to generate the FeC 2 O 4 product in purity of 99.12% with a recovery of 98.25%. Cr 3+ cations in residual solution are recovered by alkaline precipitation and calcination to generate the Cr 2 O 3 product in purity of 98.25% with a recovery of 92.68%. This work provides fresh penetrations into the synchronous detoxification, resource recovery and value-added utilization of hazardous industrial solid wastes.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Caiyun Han,Jing Xie,Xize Min
Due to the non-degradable of heavy metal, adsorption has been extensively applied to abatement it. Most studies were focused on uptake metal ions via electrostatic attraction and ion exchange, and load molecule H 3 AsO 4 from strongly acidic wastewater was still challenging. To solve the problem, bimetallic La–Zr MOFs was facilely fabricated in this work, and the fcu topology structure of La-Zr MOFs was remained well under the investigate crystallization time and crystallization temperature. However, the crystallinity of the obtained La-Zr MOFs was influenced by the synthesized factors. The obtained La–Zr MOFs was employed as adsorbent to removal Cr(VI) and As(V), and the performance was evaluated by the batch experiment. The result indicated that the adsorption performance of Cr(VI) and As(V) was positively correlated with the crystallinity , and the optimal sample was 1LaUN 12 . From the XPS characterization, it was found that H 3 AsO 4 was successfully uptake over 1LaUN 12 surface, and the maximum monolayer adsorption capacity was 83.40 mgH 3 AsO 4 /g via ligand exchange and coordination reactions with La−OH and Zr−OH. In addition, the sample 1LaUN 12 also exhibited the excellent Cr(VI) load performance, and the maximum monolayer adsorption capacity of Cr(VI) was 222.5 mg/g. Above 40% Cr(VI) was reduced to Cr(III) by amino groups, and immobilized over the surface of 1LaUN 12 . Eventually, 1LaUN 12 displayed a good structural stability in the acidic medium, which was in favor of removing Cr(VI) and As(V) efficiently from strongly acidic solutions.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
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IF 4.7
Zhuo Wang,Yihao Zhang,Wenjie Xing,Shen Zhang
In terms of the possible threats for our health, establishing efficacious strategies to determine Cr(VI) in drinking water is of significance. In this work, the fluorescence sensing of Cr(VI) was swimmingly performed based on blue-emitting carbon quantum dots (B-CQDs), which were developed using navel orange peel and N -acetyl-L-cysteine. The maximum emission wavelength was located at 433 nm when the excitation wavelength was 353 nm. After introducing Cr(VI), fluorescence quenching phenomenon was prominently displayed. Based on static quenching mechanism, a selective and sensitive fluorescence detection platform was successfully established. The wider linear range of 0–60 μM and detection limit of 0.084 μM was superior or equal to other methods. Moreover, the practical applications in real water obtained satisfactory recoveries. Taking into account the above analysis, this B-CQDs was very promising for Cr(VI) determination.
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CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Binbin Shao,Yufan Chen,Deli Wu,Chaomeng Dai,Yalei Zhang
Structural Fe(II/III) hydroxides on the shell of nano-zerovalent iron (nZVI) are reactive sites for As(III) adsorption. Well-controlled structural Fe(II) hydroxides (SFH) is prepared to serve for As(III) removal in present study. With oxygen As(III) removal by SFH occurred efficiently but the removal efficiency was greatly reduced under anoxic conditions. The mineral transformation from SFH to lepidocrocite probably contributed to the robust removal efficiency of As(III). It is found that Cu(II), Cr(VI) and NO 2 − in aqueous solution could act as oxidants and promote the mineral transformation of SFH. A more efficient As(III) removal was therefore observed without oxygen. The removal efficiency decreased in the order O 2 /SFH ≈ Cu(II)/SFH > Cr(VI)/SFH ≈ NO 2 − /SFH at near neutral pH. The removal efficiency was less dependent on the initial pH for O 2 /SFH and Cu(II)/SFH systems than Cr(VI)/SFH and NO 2 − /SFH systems. Distribution of As on solid phases was able to describe the removal mechanism of As(III), and the results showed that the mineral transformation promoted the precipitation process and inhibited outer-sphere complexation, thus leading to enhanced As removal. With Cu(II), Cr(VI) and NO 2 − , the generation of oxidants from SFH transformation drove As(III) oxidation, and contributed to total As removal.
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JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 9
·5543-5554
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IF 4.22
Huang Mengjun,Peng Di
In forensic science, the demand for the discovery and extraction of latent fingermarks at crime scenes in a fast and convenient way is still urgent. Herein, a rutile Cr- and Sb-codoped TiO 2 nanoparticle was synthesized via homogeneous precipitation and was characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, Raman spectroscopy, and X-ray fluorescence. Subsequently, the as-prepared nanoparticle was used to visualize latent fingermarks using a powder dusting method and to enhance the visualization of bloody fingermarks using a small particle reagent method on porous, semiporous, and nonporous substrates. Notably, the anti-ultraviolet property of this yellow nanoparticle was investigated. This intriguing property contributed to the detection of latent fingermarks on strong-fluorescence or multicolored surfaces in a negative-image manner. Moreover, two potential interaction mechanisms were proposed between hemoglobin and surfactants in bloody fingermark enhancement. This work showed that this rutile TiO 2 nanoparticle doped with Cr and Sb is a versatile eikonogen for the rapid visualization of latent and bloody fingermarks and has high sensitivity, selectivity, contrast as well as wide applicability compared with traditional developing methods.
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Nanomaterials
·
2021
·Vol. 11
·期 11
·3122
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IF 5.076
Rao Fu,Yinyan Gong,Can Li,Lengyuan Niu,Xinjuan Liu
The development of highly active and stable photocatalysts, an effective way to remediate environment pollution and alleviate energy shortages, remains a challenging issue. In this work, a CdIn2S4/In(OH)3nanocomposite was deposited in-situ on NiCr-LDH nanosheets by a simple hydrothermal method, and the obtained CdIn2S4/In(OH)3/NiCr-LDH heterostructure photocatalysts with multiple intimate-contact interfaces exhibited better photocatalytic activity. The photocatalytic H2evolution rate of CdIn2S4/In(OH)3/NiCr-LDH increased to 10.9 and 58.7 times that of the counterparts CdIn2S4and NiCr-LDH, respectively. Moreover, the photocatalytic removal efficiency of Cr(VI) increased from 6% for NiCr-LDH and 75% for CdIn2S4to 97% for CdIn2S4/In(OH)3/NiCr-LDH. The enhanced photocatalytic performance was attributed to the formation of multi-interfaces with strong interfacial interactions and staggered band alignments, which offered multiple pathways for carrier migration, thus promoting the separation efficiency of photo-excited electrons and holes. This study demonstrates a facile method to fabricate inexpensive and efficient heterostructure photocatalysts for solving environmental problems.
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Polymers
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2022
·Vol. 14
·期 14
·2894
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IF 4.967
Jia Qu,Qiang Yang,Wei Gong,Meilan Li,Baoyue Cao
Heavy metal ions and organic pollutants often coexist in industrial effluents. In this work, silica-di-block polymer hybrids (SiO2-g-PBA-b-PDMAEMA) with two ratios (SiO2/BA/DMAEMA = 1/50/250 and 1/60/240) were designed and prepared for the simultaneous removal of Cr(VI) and phenol via a surface-initiated atom-transfer radical polymerization process using butyl methacrylate (BA) as a hydrophobic monomer and 2-(Dimethylamino)ethylmethacrylate (DMAEMA) as a hydrophilic monomer. The removal efficiency of Cr(VI) and phenol by the hybrids reached 88.25% and 88.17%, respectively. The sample with a larger proportion of hydrophilic PDMAEMA showed better adsorption of Cr(VI), and the sample with a larger proportion of hydrophobic PBA showed better adsorption of phenol. In binary systems, the presence of Cr(VI) inhibited the adsorption of phenol, yet the presence of phenol had a negligible effect on the adsorption of Cr(VI). Kinetics studies showed that the adsorption of Cr(VI) and phenol fitted the pseudo-second-order model well. Thermodynamic studies showed that the adsorption behavior of Cr(VI) and phenol were better described by the Langmuir adsorption isotherm equation, and the adsorption of Cr(VI) and phenol were all spontaneous adsorptions driven by enthalpy. The adsorbent still possessed good adsorption capacity for Cr(VI) and phenol after six adsorption–desorption cycles. These findings show that SiO2-g-PBA-b-PDMAEMA hybrids represent a satisfying adsorption material for the simultaneous removal of heavy metal ions and organic pollutants.Keywords:silica;amphipathic;block copolymer;adsorption;Cr(VI);phenol
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Water Cycle
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2025
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IF 8.7
Xiaobin Zhou,Chenyu Zhou,Min Huang,Yingxue Wang,Mengxin Zhao,Yanan Zhang,Yinming Fan,Yinian Zhu,Zongqiang Zhu
Nano zero-valent iron (nZVI) has garnered significant attention as an excellent environmental remediation material for Cr(Ⅵ) adsorption. However, its practical utilization is significantly impeded by inherent limitations, notably its propensity for aggregation and susceptibility to oxidation. This study proposed an innovative approach that using zeolite imidazole framework-8 (ZIF-8) as a cladding material for encapsulating nZVI particles. This encapsulation served to safeguard nZVI from oxidation and agglomeration. Furthermore, the ZIF-8 coating possessed suitable pore channels, allowing the migration of Cr(VI) ions towards the nZVI’s surface, thereby enabling efficient reduction. The ZIF-8-coated nZVI composite (ZIF-8@nZVI) achieved a remarkable Cr(VI) removal efficiency of 98.43% under the optimized conditions. After 10 days of exposure in the aqueous solution, the efficiency remained above 84%. The uptake of Cr(VI) by ZIF-8@nZVI proceeded via a chemisorption pathway, inherently spontaneous and endothermic in character. The mechanism analysis indicated that ZIF-8 and nZVI exhibited synergistic enhancement effect on Cr(VI) removal. The protonated nitrogen groups within ZIF-8 facilitated the swift diffusion of negatively charged Cr(VI) ions to the surface of ZIF-8@nZVI. Once adsorbed, Cr(VI) was directly reduced to Cr(III) by Fe 0 , which in turn underwent oxidation to Fe(II)/Fe(III). Notably, Fe(II) indirectly reduced Cr(VI) to Cr(III), while itself being oxidized to Fe(III). Consequently, the resulting Cr(III) ions co-precipitated with Fe(III), forming hydroxide complexes that were eliminated from the aqueous environment. Overall, this research demonstrated the practicability of employing ZIF-8 as a coating material to develop highly efficient nZVI-based adsorbents and highlighted the potential of ZIF-8@nZVI in addressing Cr(VI) contamination challenges.
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Surfaces and Interfaces
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2025
·
IF 6.3
Haoyang Xu,Yifan Cheng,Xuen Guo,Yang Wang,Zhiqiang Zhang,Chaoqun Mu,Zhixian He,Yao Wang,Juanqin Xue,Liang Zhang
Photocatalytic reduction technology enables the transformation of highly toxic Cr(VI) into the less hazardous Cr(III), offering an environmentally friendly and sustainable approach to water treatment. This study innovatively proposes a synergistic strategy of "oxygen vacancy engineering–heterostructure construction–biomass loading" to fabricate a three-dimensional OV-Bi 12 GeO 20 /Nb 2 O 5 /CTS composite photocatalyst. The incorporation of oxygen vacancies (OVs) into Bi 12 GeO 20 via a straightforward hydrothermal approach reduces its bandgap from 3.16 eV to 1.50 eV, thereby improving visible light absorption and extending the lifespan of photo-generated charge carriers. Under identical reaction conditions, the photocatalytic reduction efficiency of Bi 12 GeO 20 is only 24.376 %, while that of OV-Bi 12 GeO 20 reaches 67.255 %. Further construction of I-type heterojunction with Nb 2 O 5 further enhances the carrier separation efficiency, and the photocatalytic efficiency of OV-Bi 12 GeO 20 /Nb 2 O 5 is increased to 94.525 %. OV-Bi 12 GeO 20 /Nb 2 O 5 is immobilized onto chitosan (CTS) via a glutaraldehyde cross-linking strategy. Owing to its abundant hydroxyl and amino functional groups, CTS demonstrates strong adsorption capacity for Cr(VI). After 5 cycles of use, its photocatalytic performance remained at approximately 98.35 % of the initial level. Experimental and mechanistic analyses reveal that OVs function as e − traps, promoting the separation of photo-generated charge carriers, while the I-type heterojunction facilitates the efficient reduction of Cr(VI) by enabling directed charge migration.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.7
Xiaohan Zhao,George K. Belousov,Sergei V. Kostjuk,Aliaksei Vaitusionak,Hongzhi Liu
A silsesquioxane-based hybrid porous polymers (PCS-SC-3) was successfully constructed via free-radical polymerization. • PCS-SC-3 exhibited efficient visible-light-driven photocatalytic performance for simultaneous Cr (VI) reduction and tetracycline degradation. • A flexible chitosan-based hybrid aerogel (PCS-SCA) was fabricated, achieving over 96% antibiotic removal efficiency with excellent reusability. A new organic semiconductor molecule 9, 9′, 9″, 9‴-(4-(trifluoromethyl)-4′-vinyl-[1, 1′-biphenyl]-2, 3, 5, 6-tetrayl) tetrakis-carbazole (StTCbzCF 3 ), was synthesized and subsequently copolymerized with octavinylsilsesquioxane (OVS) and 9-vinylcarbazole via azobisisobutyronitrile (AIBN)-initiated free-radical polymerization, yielding organic-inorganic hybrid porous polymers (PCS-SC-x (x = 1, 2, and 3; where x denotes the mass percentage of StTCbzCF 3 in the synthesized polymers: 20% (x = 1), 40% (x = 2), 60% (x = 3)). Among these materials, PCS-SC-3 exhibited a high specific surface area (478 m 2 g −1 ), a large Stokes shift (115 nm), and stable fluorescence. Notably, in the absence of sacrificial agents, 93% of Cr (VI) was photocatalytically reduced to the less toxic Cr (III) within 95 min under simulated sunlight, while >90% removal was retained after five cycles. In addition, PCS-SC-x (x = 1, 2, 3) was also demonstrated to function as a visible-light-driven photocatalyst for tetracycline hydrochloride (TCH) degradation. More than 95% of TCH was degraded within 75 min under visible light irradiation, with an initial pseudo-first-order rate constant of 0.0641 min −1 , which was higher than most previously reported photocatalysts. In the coexisting Cr (VI)/TCH system, the removal of both pollutants was enhanced; with the Cr (VI) reduction rate constant reaching 0.0713 min −1 , which was 2.05 times that obtained in the single-component system, indicating enhanced simultaneous remediation of the two pollutants. Radical-trapping experiments revealed that superoxide radicals (·O₂ − ) played a dominant role in the degradation pathway. PCS-SC-3 was further integrated with chitosan to fabricate a monolithic aerogel (PCS-SCA), which enabled efficient antibiotic degradation in a continuous-flow system and maintained a TCH removal efficiency of >96% after five cycles. This work provides a scalable, metal-free strategy for the integrated remediation of Cr (VI) and antibiotic contaminants and offers a facile and environmentally friendly route for the fabrication of flexible hybrid aerogels for practical water-treatment applications.
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Journal of Environmental Sciences
·
2019
·
IF 3.556
Junfeng Xiao,Yuanpeng Cheng,Caixia Guo,Xiangting Liu,Bing Zhang,Siguo Yuan,Jiajia Huang
A novel functional fiber (PAN-CDs) loaded with carbon dots (CDs) with excellent photoreduction and adsorption properties for Cr(VI) was prepared via an amidization reaction between the CDs' carboxyl groups and amine groups on polyacrylonitrile (PAN)-based ion exchange fibers, which could completely preserve the fluorescence properties of the CDs. The photoluminescence (PL), photocatalysis and adsorption properties of PAN-CDs were characterized and analyzed. The PAN-CDs possess high adsorption capacity (297.6 mg/g) and excellent kinetic behavior (attaining adsorption equilibrium in 30 min) for Cr(VI) adsorption. Furthermore, the residual Cr(VI) (approximately 3 mg/L) after adsorption could be removed completely by subsequent photoreduction by the PAN-CDs. The Cr-saturated PAN-CDs could be easily separated by filtering and regenerated, with no observable decay of removal efficiency after five regeneration cycles. In addition, due to the PL quenching action of Cr(VI), the PAN-CDs can also be used as sensor for quantitative detection of trace Cr(VI) in aqueous solution.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
L. Pan,M. Delaey,Y. Wang,D. Poelman
Near-infrared persistent luminescence materials have recently attracted considerable attention in the field of bio-imaging, food analysis, anti-counterfeiting, etc. However, the limited number of efficient emitters restricts their further development. Herein, a novel broadband near-infrared long persistent phosphor Na 2 CaGe 5 SiO 14 :xCr 3+ was synthesized using a high-temperature solid-phase method. Its emission range is mainly within 600–900 nm, and the persistent luminescence duration of the phosphor with the optimal doping concentration is more than 12 h. The optical properties of the samples and the relationship between the crystal field and chromium ion concentration were systematically investigated by UV diffuse reflectance spectra as well as fluorescence spectra, and the occupancy of Cr 3+ ions in the Na 2 CaGe 5 SiO 14 matrix was probed. The energy transfer process between Cr 3+ ions at different temperatures and the decay behavior at different emission wavelengths were further analyzed in conjunction with low-temperature spectra and photoluminescence decay curves. Finally, Cr ion-doped silicogermanate near-infrared long persistent luminescent materials were tested for biological tissue penetration, demonstrating their potential applications in bio-imaging.
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