POLYMER COMPOSITES
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2016
·Vol. 39
·期 5
·1507-1513
·
IF 2.004
Xin Tuo,Bingrui Li,Xianghua Yu,Changlian Chen,Zhiliang Huang,Hong Cao,Yineng Huang,Liang Li
The magnetic polypyrrole (PPy) composite nanofibers are prepared in a simple one-pot method via in situ chemical polymerization of pyrrole in the presence of methyl orange, followed by the treatment of ammonia solution. The effect of methyl orange (MO) on the morphology of the magnetic PPy nanocomposites was investigated. The composite nanofibers were used as an efficient adsorbent to remove Cr(VI) from aqueous solutions. Moreover, because of the magnetic Fe 3 O 4 nanoparticles in the composites, it is easy for the composites to be separated from waste water by external magnet. These composites with hierarchical structures are expected to be a potential candidate for water treatment. POLYM. COMPOS., 39:1507–1513, 2018. © 2016 Society of Plastics Engineers
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Yuxuan Zhang,Jun Luo,Xiuyan Wang,Dunhan Zhang,Hongxia Xu,Yuanyuan Sun,Xueyuan Gu,Xin Hu,Bin Gao,Hongqiang Ren
MXenes, such as Ti 3 C 2 T x , demonstrate tremendous potential as heavy metal adsorbents due to their abundant reaction sites, high hydrophilicity , controllable interlayer spacing, and inherent reduction ability. However, their structural dependent pollutant removal performances and the related mechanisms are far less studied. Therefore, the removing abilities of Cr(VI) from water on Ti 3 C 2 T x MXenes with different structures (multilayer (ML-) and delaminated (DL-) Ti 3 C 2 T x ) synthesized via several etching techniques were evaluated. Focusing on the most effective ML- and DL-Ti 3 C 2 T x obtained by acid/fluoride salt etching, the impacts of structural variations on the Cr(VI) removal performances were explored. Both ML- and DL-Ti 3 C 2 T x demonstrate outstanding Cr(VI) adsorption and reduction capabilities, achieving equilibrium within 500 min with capacities of 92.7 and 205 mg/g, respectively. The differences in removal mechanisms stemed from the varying adsorption and reduction capacities of two MXenes. ML-Ti 3 C 2 T x , with lower surface area and porosity, had low adsorption capacity but superior reduction ability, efficiently converting most Cr(VI) to Cr(III) (66.8%). Conversely, DL-Ti 3 C 2 T x exhibited better removal efficiency but a lower capacity for reduction (45.7%). Notably, although the partial reduction of DL-Ti 3 C 2 T x to TiO 2 results in its limited chemical reduction capacity, Ti 3 C 2 T x might serve as a co-catalyst for TiO 2 , boosting the photoresponsiveness of DL-Ti 3 C 2 T x or TiO 2 through Ti 3 C 2 T x /TiO 2 heterojunctions , thereby facilitating photocatalysis to realize the reduction of Cr(VI). Both Ti 3 C 2 T x exhibited both excellent Cr(VI) removal capacity and detoxification capacity, demonstrating their high potential in treating heavy metal pollutants in wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Peng Liao,Binrui Li,Lin Xie,Xiaoao Bai,Han Qiao,Qianqian Li,Biwei Yang,Chongxuan Liu
Engineered nanoparticles-mediated contaminant transport has been recognized as a significant process governing the mobility of metals and radionuclides in groundwater. Engineered silicate nanoparticles (ESNPs) are attractive materials for the sequestration or extraction of Cr(VI) and other metals and radionuclides from groundwater. While great efforts have been devoted toward the application of these materials for Cr(VI) sequestration, the underlying interface adsorption mechanism is not thoroughly elucidated. This study investigates the immobilization mechanisms of Cr(VI) on a representative ESNPs, NH 2 -MCM-41, over a range of water chemistry conditions. By combining batch adsorption experiments with an array of complementary characterizations, we provided spectroscopic and microscopic evidence that the electrostatic interactions between the positively charged NH 2 -MCM-41 surface derived from amino functionality and the negatively charged Cr(VI) species was the dominant mechanism responsible for Cr(VI) immobilization. In addition, the weak hydrogen bonding interactions may also contribute to adsorption to a degree. Furthermore, thermodynamic studies suggested a favorable, spontaneous, and exothermic adsorption process. Site energy analysis illustrated that the distribution of energy binding sites on NH 2 -MCM-41 is Cr(VI) loading dependent. The new insights provided here can advance understanding of the transport of Cr(VI) associated NH 2 -MCM-41 that benefits the application of ESNPs-based technologies for metals immobilization in groundwater.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jialin Niu,Yulong Xiang,Xiaoli Dong,Yu Wang,Nan Zheng,Pei Yu
Hexavalent chromium in industrial wastewater poses a serious threat to ecosystems. Photocatalytic technology has been seen as a promising strategy for removing heavy metal ions. Construction of heterostructures offered a promising strategy to enhance the separation efficiency of photogenerated carriers, thereby improving photocatalytic performance. Herein, ZnWO 4 /UiO-66-NH 2 heterostructures were synthesized by a two-step hydrothermal method. The synthesized samples were systematically characterized via a variety of techniques, alongside an exploration of the associated photocatalytic mechanism. ZnWO 4 /UiO-66-NH 2 -2 exhibited an exceptional photocatalytic performance, attaining a 97 % degradation of hexavalent chromium within 60 min, approximately 1.3 and 4.7 times that of UiO-66-NH 2 and ZnWO 4 , respectively. The transient photocurrent response, photoluminescence (PL), and electrochemical impedance spectroscopy (EIS) results indicate that constructing heterostructures can effectively accelerate the migration of electrons while simultaneously suppressing the recombination process of photogenerated carriers. In addition, Active species trapping experiments revealed that the photogenerated electrons were the main active substances in photoreduction reaction. This study offers an effective strategy for photocatalytic reduction of hexavalent chromium.
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Materials Research Express
·
2019
·Vol. 6
·期 6
·065902
·
IF 1.449
Liguang Xiao,Xiaotong Zhang,Gang Yan
The Cr(VI) is a acute toxic and bioaccumulated pollutant in wastewater, the removal of these contaminants is particularly significant. Semiconductor photocatalysis is an effective method to reduce the Cr(VI) in the wastewater. In this paper, diatomite/Bi2S3 composite photocatalysts are synthesized by a facile in suit hydrothermal vulcanization method using bismuth nitrate and thiourea as precursors and diatomite as supporting materials. The structural information, morphologies, chemical states and optical properties of the composite are characterized by XRD, SEM, XPS and DRS. Under visible light irradiation (λ > 400 nm), the diatomite/Bi2S3 composite exhibit better photocatalytic reduction activity of Cr(VI) than the pristine Bi2S3. The photocatalytic mechanism is further investigated by the active species capturing tests and photoelectrochemical measurements.
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SYNTHETIC METALS
·
2016
·
IF 2.299
Jianyu Ren,Xiongyi Huang,Ning Wang,Kezhen Lu,Xingxiang Zhang,Wei Li,Dongqin Liu
A composite nanofibers mat containing polyacrylonitrile (PAN) as core and polyaniline (PANI) as sheath had been successfully prepared via solution spinning followed by in situ polymerization, and its hexavalent chromium (Cr(VI)) removal potential was investigated. By altering the processing parameters, bead-free and uniform PAN nanofibers with average diameter of 469 nm could be obtained. The morphological evolution of the PANI/PAN composite fiber mats could be controlled through regulating the molar ratio of oxidant to monomer. The PANI/PAN composite fiber mats presented a superior Cr(VI) adsorption performance. Moreover, the factors affecting the performance of Cr(VI) removal from the aqueous solutions were investigated systematically. The experimental data were fitted to various kinetic models and isothermal adsorption, and the thermodynamic parameters of adsorption process were calculated as well. The PANI/PAN adsorbents were also proven to have good recycling capability, and the mechanism of adsorption and regeneration was investigated in detail.
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JOURNAL OF SOLID STATE CHEMISTRY
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2024
·
IF 3.2
Yuan Zhou,Jin-Long Jiang,Xia-Ping Zhu,Wen Chen
In this study, attapulgite (ATP) was modified by Zr-based metal organic framework (UiO-66-NH 2 ) and poly(hexamethylenediamine-tannic acid) (HTA), an amino material named UiO-66-NH 2 /HTA/ATP (UHA) was prepared to efficiently remove Cr(VI). The morphology and structure of UHA were analyzed through various characterization methods. The conditions and influencing factors of UHA preparation and Cr(VI) adsorption were studied. The material had a maximum adsorption capacity of 270.3 mg/g for Cr(VI) when pH was 2.0, temperature was 298 K, adsorption time was 300 min, and ionic strength was 0.01 mol/L, which was obtained by the Langmuir fitting model. The adsorption process conforms to the pseudo-second-order kinetic and Langmuir isothermal models, indicating that the adsorption process is mainly based on the chemical adsorption of monolayers. X-ray photoelectron spectroscopy analysis shows that UHA mainly removes Cr(VI) by hydrogen bonding , electrostatic attraction, reduction, and complexation. Thermodynamic investigation suggested a disordered, endothermic and spontaneous adsorption process. After UHA treatment, the simulated wastewater containing Cr(VI) met the discharge standard, and the results of cycling experiments showed that UHA has good renewable performance and offers potential prospects for Cr(VI) removal in water.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Umer Hayat,Shafuq Abbas,Yingjie Xiao,Rohan Weerasooriya,Xing Chen
Hexavalent chromium (Cr(VI)) is a hazardous and mobile contaminant noted for its severe environmental impacts. This research presents a low-cost, efficient, and eco-friendly method that utilizes starch extracted from Maranta arundinacea (arrowroot) for the selective recovery and discarding of chromium (VI) from electroplating effluents driven by a visible light photochemical procedure. This method alleviates the transition of harmful and toxic Cr(VI) into the less toxic and more stabilized trivalent chromium (Cr(III)), which eventually forms firm coordination complexes with the arrowroot starch along with functional groups such as hydroxyl groups ( OH) and ether groups (C O C), as verified by FTIR and XPS analyses. Noticeable structural alteration in the starch matrix was observed upon interaction with chromium ions. At pH 3.0, the process achieved a maximum removal limit of 98.3 %, but at pH 10.0, the efficiency decreased markedly to 3.2 %. Additionally, within the tested concentration range of 10–50 mg/L, the extraction efficiency remained at or above 90 %. In the presence of competing ions such as Ca, Cu, Zn, and Ni, chromium was selectively removed. Furthermore, when the starch dosage was increased from 50 mg to 450 mg, the efficiency was enhanced by approximately 55 % to nearly 95 %. This increase in dosage promoted the faster reduction within 300 min. The entire approach is environmentally benign, generating no secondary waste, and thus making it a viable and sustainable option for industrial-scale wastewater treatment. These results demonstrate the potential value of arrowroot starch as an efficient material for sustainable and economical chromium remediation.
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Desalination and Water Treatment
·
2024
·
IF 1
Zhuan-nian Liu,A.-ping Fan,Xiao-gang Han,Habiba Shapour,Qing-yun Zhang
The chelating adsorbent PEI-MIL-101(Cr) was prepared by introducing polyethyleneimine (PEI) into the MIL-101(Cr) channel in this paper. X-ray diffractometer, Fourier transform infrared spectrometer and scanning electron microscope were applied to characterize the structure and morphology of MIL-101(Cr) and PEI-MIL-101(Cr). The adsorption properties and mechanism of the MIL-101(Cr) and PEI-MIL-101(Cr) to Cr(VI) were studied. The results showed that adsorption capacity of PEI-MIL-101(Cr) for Cr(VI) was obviously better than MIL-101(Cr). The adsorption isotherm of Cr(VI) onto MIL-101(Cr) and PEI-MIL-101(Cr) can be described by Langmuir model. The maximum adsorption amount for Cr(VI) onto MIL-101(Cr) and 30% PEI-MIL-101(Cr) was 61.99 and 40.34 mg/g. The adsorption kinetic data of the two adsorbents followed the pseudo second-order model. The negative values ΔH and ΔG illustrate that the process is spontaneous and exothermic. PEI-MIL-101(Cr) can be reused for four times.
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Journal of the Australian Ceramic Society
·
2026
·
IF 2.6
Chen Yuan,Wang Shu,Li Xin
Heavy metal pollution is a globally environmental crisis as the demand for electronic products being steadily on the increase. In our work, a novel transition metal Sn-doping strategy has been proposed to reconstruct the valence band of CdS by s-p orbit hybridization. An easy and mild solvothermal method was employed to synthesize the Sn-doped CdS nanoparticles, in which Sn 2+ ions substitute Cd 2+ ions to occupy CdS lattice. This Sn-doping modification effectively narrows the bandgap and regulates the energy band structure of CdS. In this case, it has caused an extension of the visible light absorption range, an enhancement of photogenerated carrier separation efficiency, and an improvement of thermodynamic potential, as well as a photostability from photocorrosion. For the optimization effect of Sn doping, the 4 at% Sn-doped CdS sample has performed the highest efficiency of photocatalytic reduction Cr (VI) degradation, achieving 84.8% Cr (VI) removal within 10 min, as 1.3 times higher than that of bare CdS. This research establishes an experimental framework for the advancement of efficient and stable nano-photocatalysts, with implications for band engineering in metal dichalcogenide semiconductors.
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ANALYTICAL SCIENCES
·
2026
·
IF 2
Liang Jinhua,Ye Hongying,Yuan Zuhuan,Wu Zhaodi,Li Guizhen,Hao Ruizheng,Wu Xiaoqian,Cheng Shipei,Hu Yilin,Zhu Wenyuan
Hexavalent chromium (Cr(VI)), a highly toxic and carcinogenic environmental pollutant, poses severe threats to ecological balance and human health. Traditional colorimetric detection methods relying on peroxidase-like nanozymes often suffer from interference caused by reactive oxygen species (ROS) and coexisting redox-active substances, compromising their accuracy in complex water matrices. Herein, we report a novel H 2 O 2 -free colorimetric strategy for the ultrasensitive detection of Cr(VI) using atomically dispersed CuCo-NC catalysts. Unlike conventional mechanisms, the synergistic interplay between Cu and Co atoms modulates the electronic structure (d-band center), enabling Cr(VI) to act as a direct electron acceptor. This unique pathway facilitates the oxidation of TMB without generating ROS intermediates, thereby conferring exceptional resistance to common interferents such as Fe 2+ /Fe 3+ . The sensor exhibits a wide linear range (50–1000 nM) and an ultralow detection limit of 1.12 nM, surpassing many existing methods. Furthermore, the practical applicability of this probe is validated through the successful monitoring of Cr(VI) in real water samples (e.g., Guilin Lijiang River), demonstrating its robustness for on-site environmental surveillance. This work not only provides a reliable tool for early-warning monitoring of chromium pollution but also offers mechanistic insights into H 2 O 2 -free catalytic pathways. Graphical abstract Schematic illustration of the H 2 O 2 -free colorimetric sensing strategy using atomically dispersed CuCo-NC nanozymes. The synergistic Cu/Co dual sites enable Cr(VI) to act as a direct electron acceptor, bypassing the generation of reactive oxygen species (ROS) and thus eliminating interference from coexisting redox-active substances. This mechanism allows for the ultrasensitive and selective visual detection of Cr(VI) in real water environments
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ENVIRONMENTAL RESEARCH
·
2026
·
IF 8.2
Hong Wu,Zhuoqi Liu,Tianrong Xiong,Xingyan Liu,Ying Chen,Min Fu,Yue Deng,Yongcheng Feng,Yuyu Fang,Bowen Lei,Youzhou He
Traditional methods for treating Cr(VI)-containing wastewater often encounter issues such as high energy consumption, susceptibility to secondary pollution and limited treatment efficiency. In contrast, photocatalytic technology harnesses solar energy to efficiently reduce Cr(VI) to less toxic Cr(III) under mild conditions, offering advantages including operational simplicity and environmental friendliness, thereby providing a superior alternative. This study proposes a dual MOF precursor strategy to synthesise Cd-ZIF@NH 2 -MIL-68 composite materials, which undergo further sulphurisation to successfully construct a CdS/In 2 S 3 type-II heterojunction photocatalyst with a hollow structure. This material exhibits a larger specific surface area, increased exposure of active sites and abundant heterojunction interfaces. This heterojunction achieves an ultrafast, 99.26% removal of Cr(VI) within only 18 minutes under LED illumination, exhibiting outstanding stability with 88.10% activity retention after five cycles. Systematic characterization, photoelectrochemical tests and density functional theory (DFT) calculations collectively confirm that the successful band engineering in CdS/In 2 S 3 induces the formation of a type-II heterojunction, thereby significantly facilitating the efficient separation and migration of photogenerated charges. The combination of radical trapping experiments and electron paramagnetic resonance (EPR) spectroscopy identifies photogenerated electrons (e - ) and superoxide radicals (·O 2 - ) as the predominant reactive species. This work provides new insights for designing highly efficient MOFs-derived heterojunction photocatalysts for the rapid remediation of Cr(VI) pollution.
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