Journal of Advanced Dielectrics
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2018
·
IF 0
Yi Tang,Chenhui Yang,Wenxiu Que
Herein, we report on a novel two-dimensional (2D) material application, which shows that an accordion-like layered Ti 3 C 2 nanomaterial (MXene) with an excellent adsorption capacity of Cr(VI) from aqueous solution was prepared by etching Al layer from Ti 3 AlC 2 phase in hydrofluoric acid (HF) solution. Ti 3 C 2 nanopowders were well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the physical property of as-obtained samples was studied by UV–Vis diffuse reflectance spectra (DRS). After HF treatment, Ti 3 AlC 2 not only has a phase transition from one crystal to another, but surprisingly, its microstructure is also undergoing an obvious change. Ti 3 C 2 with product of change possesses an accordion-like multilayer structure, and a relatively higher specific surface area (SSA) than untreated Ti 3 AlC 2 . Then, accordion-like Ti 3 C 2 with a high SSA provides abundant active sites for pollutant removal and functionalization. Accordion-like Ti 3 C 2 nanomaterial exhibits a stable adsorption capacity, and 1 g as-prepared accordion-like Ti 3 C 2 powders can remove about 80 mg potassium dichromate. Therefore, the results suggest that 2D MXenes are promising as an effective nanoadsorbent in heavy metal removal from the wastewater.
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DIAMOND AND RELATED MATERIALS
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2024
·
IF 4.3
Tao Chen,Luzhao Xing,Shaojun Niu
Here, a novel magnetic nitrogen-rich biochar (MNRB), synthesized by attaching Fe 3 O 4 @SiO 2 -NH 2 particles with core-shell structure on crab shell derived/nitrogen-rich biochar (NRB), was used as absorbent and reductant to remove hexavalent chromium in aqueous systems. Characteristics of the material demonstrated that the MNRB was rich in nitrogen-containing functional groups and that the Fe 3 O 4 @SiO 2 -NH 2 magnetic particles with a diameter of approximately 150 nm were successfully added on the MNRB surface by strong ether linking (C-O-C). The maximum removal capacity of MNRB was 152.9 mg·g −1 , which was considerably higher than most reported magnetic biochar. Study of the removal mechanisms revealed that the Cr(VI) removal by MNRB involved three steps: (1) adsorption of Cr(VI) anions by protonated functional groups; (2) reduction of Cr(VI) anions to Cr(III) cations by electron-donor groups; and (3) chelation of Cr(III) cations by amine groups. The easy regeneration, satisfactory reusability, and remarkable performance in batch tests reflected the high potential of MNRB for treating Cr(VI)-contaminated water.
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高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Wen Sun,Rui Wang,Lingfei Li,Jun Zhao,Bianhua Liu
To combat the increasingly serious water pollution caused by heavy metal ions , the development of efficient adsorbents is of great significance. In this study, a novel composite adsorbent for Cr(VI) removal was smartly designed using environmentally friendly materials such as tannic acid (TA) and polyethyleneimine (PEI) for surface modification of g-C 3 N 4 nanosheets through covalent assembly of polyphenols and amines. The obtained (PEI-TA)-g-C 3 N 4 composite was capable of efficiently and quickly adsorbing Cr(VI) in water, with a maximum adsorption capacity of 769.23 mg/g at 308 K (35 °C), which was much higher than most reported Cr(VI) adsorbents. Notably, (PEI-TA)-g-C 3 N 4 could reduce highly toxic Cr(VI) to low toxic Cr(III) and effectively adsorb it. The Cr(VI) adsorption process was a spontaneous thermal adsorption process that conformed to the pseudo-second-order kinetic model and Langmuir isotherm model. In addition, the excellent photothermal performance of (PEI-TA)-g-C 3 N 4 further accelerated the adsorption of Cr(VI). Moreover, the strong anti-interference ability of (PEI-TA)-g-C 3 N 4 composite against anions and other metal ions enabled it to effectively remove Cr(VI) in complex environments, expanding its practical application scenarios. The polymer coatings rich in phenolic hydroxyl- and amine-rich formed on the large surface area of g-C 3 N 4 and the protonation of the amino groups are the keys for (PEI-TA)-g-C 3 N 4 composite to have ultra-high adsorption performance and strong anti-interference ability towards Cr(VI). The designed strategy of this metal-free and environmentally friendly composite with ultra-high removal of Cr(VI) capability from wastewater provides new ideas for developing green, inexpensive, and efficient adsorbents.
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高影响因子
Toxics
·
2025
·Vol. 13
·期 9
·759
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IF 4.1
Haixin Wang,Tao Shen,Yiming Wang,Zongxiang Lv,Yu Liu,Juan Wu,Tai Li,Shui Wang,Yanguo Shang
This study developed a novel adsorbent for Cr (VI) removal from wastewater by grafting N-[(dimethylamino)methylene]thiourea (TUFA) onto lignin. The resulting TUFA-functionalized lignin adsorbent AL was comprehensively characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR), and X-ray photoelectron spectroscopy (XPS). Batch adsorption experiments systematically evaluated the influence of solution pH, contact time, temperature, initial Cr (VI) concentration, and adsorbent dosage. AL exhibited high adsorption capacity (593.9 mg g−1at 40 °C), attributed to its abundant nitrogen and sulfur-containing functional groups. Kinetic analysis revealed that the adsorption process followed pseudo-second-order kinetics. Equilibrium isotherm data were best described by the Langmuir model, indicating predominant monolayer chemisorption. Thermodynamic parameters demonstrated that Cr (VI) adsorption onto AL is spontaneous, endothermic, and entropy-driven. The adsorption mechanism involves membrane diffusion and intra-particle diffusion processes. This work successfully synthesized a stable, effective, and low-cost adsorbent (AL) using an amine agent incorporating both nitrogen and sulfur functional groups, offering a promising approach for treating Cr (VI)-contaminated wastewater.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2024
·Vol. 31
·期 14
·21279-21290
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IF 0
Xiong Ling,Zhang Fen,Yang Yanan,Ding Yuqing,Chen Shaohua
A novel adsorbent, deposited PPy on the DMI (PPy/DMI) composite, was successfully synthesized for Cr(VI) removal from aqueous solution. PPy/DMI composite was characterized by BET, SEM, TEM, XRD, and XPS. The SEM and TEM analyses revealed that DMI can greatly reduce the aggregation of PPy and significantly enhance its adsorption performance. The Cr(VI) removal was highly pH dependent. The high selectivity of PPy/DMI composite for Cr(VI) removal was found even in the presence of co-existing ions. The adsorption kinetic process followed the pseudo-second-order equation, demonstrating that the Cr(VI) adsorption behavior onto PPy/DMI is chemisorption. Furthermore, the intra-particle diffusion model implied that the adsorption was controlled by both liquid membrane diffusion and internal diffusion. The adsorption isotherm data fitted well with the Langmuir model with the maximum adsorption capacity (406.50 mg/g at 323 K) which was considerably higher than that of other PPy-based adsorbents. The Cr(VI) adsorption onto PPy/DMI composite was endothermic. The main mechanisms of Cr(VI) removal are involved in adsorption through electrostatic attractions, ion exchange, and in situ reduction. The results suggested that PPy/DMI composite could be a promising candidate for efficient Cr(VI) removal from aqueous solution. Graphical
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AQUATIC TOXICOLOGY
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2016
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IF 3.557
Hongxing Chen,Lei Mu,Jinling Cao,Jingli Mu,Paul L. Klerks,Yongju Luo,Zhongbao Guo,Lingtian Xie
Chromium (Cr) is an essential metal and a nutritional supplement for both human and agricultural uses. It is also a pollutant from a variety of industrial uses. These uses can lead to elevated Cr levels in aquatic environments, where it can enter and affect aquatic organisms. Its accumulation and subsequent effects in fish have received relatively little attention, especially for chronic exposure. In the present study, Japanese medaka were chronically exposed to dissolved or dietary Cr(VI) for 3 months. Cr accumulation in liver, gills, intestine, and brain was evaluated. Effects on the antioxidant system, nervous system (acetylcholinesterase, AChE), digestive system (α-glucosidase, α-Glu), and tissue histology (liver and gills) were also assessed. Cr accumulation was observed in the intestine and liver of fish exposed to Cr-contaminated brine shrimp. However, chronic dissolved Cr exposure led to significant Cr accumulation in all organs tested. Analysis of the subcellular distribution of Cr in medaka livers revealed that 37% of the Cr was present in the heat stable protein fraction. The dissolved Cr exposure had pronounced effects on the antioxidant system in the liver, with an elevated ratio of reduced glutathione/oxidized glutathione (GSH/GSSG) and decreases in GSH and glutathione S -transferase (GST). The α-Glu activity in the intestine was significantly inhibited. In addition, Cr exposure caused histopathological alterations in the gills and liver. In general, the effects of dietary Cr were relatively minor, possible due to the much lower accumulation in the fish. Our results imply that Japanese medaka accumulate Cr mainly via uptake of dissolved Cr(VI).
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2018
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IF 6.434
Qiaoping Kong,Jingyue Wei,Yun Hu,Chaohai Wei
In order to increase the density and quantity of functional groups on adsorbent, three terminal amino hyperbranched polymer modified graphene oxide adsorbents including GO-HBP-NH 2 -DETA, GO-HBP-NH 2 -TETA and GO-HBP-NH 2 -TEPA with N-containing functional group density of 7.21 wt%, 10.20 wt% and 12.43 wt%, respectively, were prepared and used for the adsorption and reduction of toxic hexavalent chromium Cr(VI) to less toxic Cr(III). The morphology and structure of obtained adsorbents were characterized by FT-IR, SEM, XRD, Raman, BET, XPS and zeta potential. The density of receptor sites (N m ) of the three adsorbents calculated from statistical physics model with one energy site were found to be 456.62, 604.54 and 636.03, respectively. Adsorption experiments demonstrated that the high adsorption capacities of the three adsorbents obtained from Langmuir isotherm model towards Cr(VI) were 245.01, 257.26 and 300.88 mg/g, respectively, suggesting that GO-HBP-NH 2 -TEPA had better adsorption ability. The density functional theory calculation (DFT) indicated that GO-HBP-NH 2 -TEPA was more likely to adsorb HCrO 4 − rather than Cr 2 O 7 2− at lower pH conditions. A possible adsorption mechanism was also proposed where electrostatic interaction between Cr(VI) (HCrO 4 − or Cr 2 O 7 2− ) and the N functional group (+) on GO-HBP-NH 2 -TEPA dominated the adsorption of Cr(VI) and reduction mechanism dominated the reduction of Cr(VI)–Cr(III).
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高影响因子
WATER RESEARCH
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2022
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IF 13.4
Chaoxia Zhao,Li Xue,Hongxiao Shi,Wenqi Chen,Yu Zhong,Yi Zhang,Yanping Zhou,Kama Huang
Different physicochemical properties between Cr(VI) and phenolic compounds pose serious challenges for the effective treatment of co-contamination. This study developed an electrodeless high-flow microwave atmospheric plasma jet for the single-step simultaneous degradation of p -nitrophenol (PNP) and reduction of Cr(VI). Following a 15 min treatment with microwave atmospheric pressure plasma, the removal efficiency of Cr(VI) and PNP reached 97.5% and 93.6%, respectively, whereas that of total organic carbon reached 30.2%. Adding PNP to the solution significantly improved Cr(VI) reduction, whereas PNP degradation increased slightly with Cr(VI). The results indicate that the PNP intermediates significantly affected Cr(VI) reduction. Additionally, long-lived H 2 O 2 and short-lived · H aided the reduction of Cr(VI) during plasma treatment. The addition of hydroxyl scavengers during treatment implied that · O H was largely responsible for PNP oxidation. High-performance liquid chromatography–mass spectroscopy (HPLC-MS) revealed that PNP intermediates, including p -nitrocatechol and 5-nitrobenzene-1,2,3-triol, function as Cr(VI) reductants. On the basis of the examined intermediate products, the potential PNP degradation pathway was investigated. The factors that could influence simultaneous dehgradation and reduction, including solution pH, gas velocity, and distance between the plasma outlet and the water surface were researched. Low pH supports Cr(VI) reduction, and the promotion of PNP for Cr(VI) reduction applies to all pH values. The degradation of PNP is insensitive to pH values with or without Cr(VI). The optimal gas velocity for PNP degradation and Cr(VI) reduction was revealed to be 6 L/min. The simultaneous removal of PNP and Cr(VI) benefits from a shorter distance between the plasma outlet and the water's surface.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2026
·
IF 2.8
Yuning Yang,Qiao Yan,Yiming Zhou
Chromium (Cr) ions, as a critical pollutant in industrial wastewater, posed a persistent challenge for research aiming to realize their efficient removal alongside detoxification. Here, we presented a novel cellulose-based nanoadsorbent, PDA@CNCs/FeS, obtained via dopamine (DA) self-polymerization onto cellulose nanocrystals (CNCs) and subsequent FeS nanoparticle immobilization. Experimental results demonstrated that the adsorbent achieved a high removal capacity of 837.9 mg/g for Cr(VI) and exhibited efficient removal under mildly acidic conditions (pH 5.0), which outperformed the majority of cellulose-based adsorbents. The adsorption followed the Langmuir isotherm model and fitted well with the Pseudo-second-order kinetic. FTIR and XPS analyses confirmed the adsorption mechanism, which revealed that electrostatic attraction was involved in Cr(VI) removal, while the synergistic effect between reductive PDA and FeS on the nanoadsorbents facilitated the detoxification of toxic Cr(VI) to less harmful Cr(III). Nearly 70% of the adsorbed Cr(VI) was reduced to Cr(III), with a final ratio of 31.4%:68.6% for Cr(VI):Cr(III). Furthermore, PDA@CNCs/FeS also demonstrated excellent reusability, with over 80% of its Cr(VI) removal efficiency remaining after four adsorption–desorption cycles; these findings implied that PDA@CNCs/FeS held great promise as an adsorbent for Cr(VI) remediation in water treatment.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
·
IF 5.4
Zilong Yin,Xiaohui Lu,Xiuli Yan,Yan Li,Chunfeng Wang,Shenjun Qin,Shuangshuo Li,Tao Chang
The effective removal of highly toxic Cr(VI) from industrial wastewater necessitates the development of an exceptionally efficient and stable adsorbent. Herein, we designed an innovative strategy for constructing a multifunctional polymer adsorbent, wherein cationic viologen served as both the cross-linker and the immobilization carrier for polyethyleneimine (PEI) through the Zincke reaction. Moreover, the incorporation of Pluronic F127 as a soft template induced the formation of well-defined mesoporous microspheres, which significantly improved the accessibility of active sites and the surface hydrophilicity of the adsorbent. Consequently, the synthesized adsorbent, VLF-PEI 10,000 -Cl, exhibited an ultra-high adsorption capacity of 1304 mg/g for Cr(VI) under optimal conditions (pH 2, 318 K), surpassing that of most reported materials. The adsorption process followed the pseudo-second-order kinetic model and the Langmuir isotherm, indicating a monolayer chemical adsorption process. Meanwhile, a synergistic triple-action mechanism, encompassing "capture-detoxification-complexation" processes, was identified as contributing to the superior adsorption capacity. Notably, substituting the counterions with nitrate ions (NO 3 − ) resulted in a 5% enhancement in removal efficiency within nitrate-rich water. This result demonstrates the great potential of tailoring the adsorbent's counterion composition to enhance its adsorption performance in various aquatic environments.
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高影响因子
LANGMUIR
·
2026
·
IF 4.4
Lei Zhang,Jianhao Qiu,Guanglu Xia,Chen Chen,Meng Liu,Yiliang Chen,Jianfeng Yao
Element doping has attracted extensive attention as a strategy to regulate the electronic structure of catalysts. In this study, Ni-doped Bi2MoO6 nanosheets were uniformly anchored onto rod-like In2O3 to furnish substantial accessible reactive sites and close interfacial contact. Ni doping enabled a precise modulation for the band configuration of Bi2MoO6, imparting a Z-scheme heterojunction between Ni-doped Bi2MoO6 and In2O3. The Ni-doped Bi2MoO6/In2O3 Z-scheme heterojunction exhibits excellent photocatalytic performance in the treatment of Cr(VI) and emerging organic contaminants. In the Cr(VI)/bisphenol A coexistence system, Ni-doped Bi2MoO6/In2O3 not only achieved high reduction efficiency for Cr(VI), but also enhanced the degradation rate of bisphenol A by a factor of 4.7 compared to the single-pollutant system. The removal efficiencies could surpass many related reported studies. The product toxicity after bisphenol A degradation in a mixed Cr(VI)/bisphenol A system was analyzed by the total organic carbon content, high-performance liquid chromatography-tandem mass spectrometry, the toxicity estimation software tool, and microbial activity, manifesting that their impact on the environment has been greatly reduced. Furthermore, the catalyst maintains stable and consistent performance in multiple binary systems, including Cr(VI)/tetracycline and Cr(VI)/ciprofloxacin. This work provides insights for the design of element-doped heterojunction catalysts, which demonstrate high performance, durability, and environmental compatibility in the treatment of complex wastewater.
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PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2026
·
IF 5.4
Somayeh Mirsadeghi,Hamed Zandavar,Alireza Soroush,Seied Mahdi Pourmortazavi
Renewable NC/PbO/Pb 3 O 4 nanofibers engineered for Cr(VI) waste treatment; • Dual-oxide valence synergy enhances interfacial stability and Pb O site density; • Rapid uptake and high time-point adsorption capacity (754 mg g −1 ) in representative realistic concentration; • Thermo-mechanistic modeling links kinetics to matrix-filler energetics; • Pb leaching ≤7.9 μg L −1 ; safe operation verified across regeneration cycles. Electrospun nitrocellulose (NC) nanofibers embedded with dual lead oxides (PbO/Pb 3 O 4 ; 2.5 wt% each oxide) were developed as a reusable adsorbent for hexavalent Chromium [Cr(VI)] capture while enabling a “blueprint-style” thermo-mechanistic performance profiling. SEM confirmed uniform nanofibers with an average diameter of 111.1 nm, and FTIR verified oxide incorporation through characteristic Pb-O/Pb-O-Pb vibrations in the low-wavenumber region. N 2 physisorption indicated a slight but steady rise in accessible porosity after oxide embedding. Surface area (BET) increased from 1.34 to 1.83 m 2 g −1 , and total pore volume from 0.055 to 0.0687 cm 3 g −1 . This change aligns with particle decoration or embedding that enhances interfacial voids without forming microporosity. Under dilute optimization conditions (C 0 = 5–30 mg L −1 ), the composite achieved 98% Cr(VI) removal at pH 3, an adsorbent dosage of 0.03 g, and a contact time of 25 min. To verify performance under representative high-strength industrial loading, kinetics were further evaluated at the controlled Cr(VI) solution prepared at the measured barium chromate production-line concentration (C 0 = 470 mg L −1 ), yielding rapid uptake with q t = 754 mg g −1 at 25 min. Equilibrium modeling followed Langmuir behavior ( q m = 367.5 ± 18.4 mg g −1 , K L = 4.33 ± 0.68 L mg −1 , R 2 = 0.98; R L = 0.044–0.0076), with more favorable apparent Langmuir-derived free-energy descriptors for the composite than for neat NC (ΔG°:-1.57 ± 0.45 to −3.62 ± 0.39 kJ mol −1 ), while kinetics were best described by the pseudo-second-order model (R 2 = 0.99; q e = 441.7 ± 12.6 mg g −1 ). The nanofiber retained 70.1 ± 2.1% of its adsorption capacity after 25 adsorption-desorption cycles, and Pb leaching remained low (2.8–7.9 μg L −1 ; 0.006–0.017% of embedded Pb), well below relevant guideline/action thresholds. A Comparative Performance Index (CPI) integrating capacity, affinity, and energy criteria demonstrated consistent performance under varied operating conditions. This thermo-mechanistic framework links laboratory adsorption descriptors with early process-screening criteria, providing a basis for subsequent continuous-flow validation. Download: Download high-res image (270KB) Download: Download full-size image
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高影响因子
危险品化学品经营许可证（带存储）