JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Jing Liang,Xinyu Li,Yujing Zheng,Yingnan Pang,Yunxing Zhao,Yao Wang,Jiejing Zhang,Jianfeng Zhang
Advanced reduction processes (ARPs) have become hotspot because of their fast and efficient features in pollutant treatment. In this study, a novel ARP was raised through the assistance of biological wastewater degradation solutions (PDs), to completely reduce Cr(VI). Enterobacter cloacae YN-4, which could completely degrade 1500 mg/L phenol within 72 h, was isolated and identified. While, the content of organic acids and their derivatives in PDs was extremely high (74.76 %). After the combination of PDs with Fe(III) and UV, 10 mg/L Cr(VI) was completely reduced within 66 min, whose reduction rate of Cr(VI) was stable at various concentrations (10–100 mg/L), which was applicable on electroplating wastewater. In addition, Cr(VI) could be reduced stably (71.63 %) after 10 cycles. Compared with the reported ARPs, herein, the components was complex, which was firstly proposed that simultaneous action of polycarboxylic acids, monocarboxylic acids, amino acids and alcohols could promote and ensure the stable reduction of Cr(VI). Among them, the multispecies radicals·CO 2 - and·O 2- generated in PDs were combined with Fe(II), to co-reduce Cr(VI). This strategy produces a wide variety of radicals, which can provide an alternative pathway for remediation of various heavy metals and organic pollutants.
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2017
·Vol. 55
·期 20
·3404-3412
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IF 2.952
Yulong Jin,Ning Zhao,Ruihua Cheng,Xuelian He,Zhen Liu,Dalin Dong,Yuezhen Bin,Xiaowei Chen,Liangbin Li,Boping Liu
Bimodal ultra-high-molecular-weight polyethylene (UHMWPE)/high-density polyethylene (HDPE) in-reactor blends (IRBs) are produced by the bimetallic catalysts, which are synthesized through co-supporting silylchromate and vanadium-oxide-based catalysts on silica or alumina, zirconia and titania-modified silica. After support modification, the activities of the catalysts for ethylene polymerization are substantially enhanced. The IRBs produced by the modified catalysts also contain more UHMWPE and low-molecular-weight polyethylene (LMWPE) fractions, and have much broader molecular weight distribution (MWD). The homogeneous nature of the IRBs is preliminarily confirmed by the differential scanning calorimetry melting curves, showing unique melting peak in both nascent and recrystallized states. The rheological results reflect that the viscosity of the IRBs is reduced more or less when compared with UHMWPE. The distinct elastic dominance of the IRBs is also observed, implying the UHMWPE characteristics in the IRBs. In addition, the intimate mixing of the IRBs is further verified by the similar slopes of Han curves for the polyethylene (PE) samples. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55 , 3404–3412
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Materials
·
2024
·Vol. 17
·期 7
·1598
·
IF 3.1
Yongqi Liu,Shasha Chu,Yuebing Xu,Xinyu Chen,Hao Zhou,Jinlin Li,Yanjie Ren,Xintai Su
Upcycling Cr-containing sulfate waste into catalysts for CO2hydrogenation reaction benefits both pollution mitigation and economic sustainability. In this study, FeCrO3/Fe2O3catalysts were successfully prepared by a simple hydrothermal method using Cr-containing sodium sulfate (Cr-SS) as a Cr source for efficient conversion and stable treatment of Cr. The removal rate of Cr in Cr-SS can reach 99.9% at the optimized hydrothermal conditions. When the synthesized catalysts were activated and used for the CO2hydrogenation reaction, a 50% increase in CO2conversion was achieved compared with the catalyst prepared by impregnation with a comparable amount of Cr. According to the extraction and risk assessment code (RAC) of the Reference Office of the European Community Bureau (BCR), the synthesized FeCrO3/Fe2O3is risk-free. This work not only realizes the detoxification of the Cr-SS but transfers Cr into stable FeCrO3for application in a catalytic field, which provides a strategy for the harmless disposal and resource utilization of Cr-containing hazardous waste.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
·
IF 11.3
Dayu Sun,Dongdong Chu,Mingkai Xu,Chao Xing,Lan Ling
The remediation of multicomponent wastewater containing high-valent heavy metals and organic pollutants remains a significant environmental challenge. Visible-light-driven photocatalysis holds promise for concurrent pollutants decontamination, but is often hindered by sluggish interfacial charge transfer, rapid electron-hole recombination, and inadequate redox-active carriers. In this work, we present a dual-vacancy-incorporated Bi 2 WO 6 ( V -BWO) photocatalyst, featuring strategically introduced oxygen vacancies (OVs) and bismuth vacancies (BiVs), to overcome these constraints. Integrated theoretical and experimental investigations uncover a defect-mediated charge dynamics mechanism: OVs function as shallow electron traps enabling ultrafast charge capture, while BiVs function as deep relaxation sites that—under Cr(VI)-induced electron quenching—synergistically stabilize holes and extend their lifetime. This synergistic vacancy modulation achieves exceptional performance: a ciprofloxacin (CIP) degradation rate constant of 3.3 × 10 −2 min −1 with concurrent Cr(VI)-to-Cr(III) conversion (0.036 mmol/L reduced after 60 min). Notably, the catalyst sustains robust > 80.6 % contaminant removal efficiency in continuous-flow operation across diverse pollutants including CIP, bisphenol A (BPA), and rhodamine B (RhB). These findings elucidate the pivotal role of dual-defect states in tuning carrier dynamics and establishes a robust platform for integrated photocatalytic detoxification of multicomponent wastewater streams.
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IONICS
·
2025
·
IF 2.6
Chen Silu,Lu Songhua,Ma Jianfeng
The incorporation of semiconductor materials on Fe 3 O 4 has been demonstrated as an efficient way to promote the photocatalytic activity of Fe 3 O 4 . Therefore, we synthesized Fe 3 O 4 @In 2 S 3 composite by growing ultrathin In 2 S 3 nanosheets on the surface of Fe 3 O 4 using a simple one-pot water bath heating method. Fe 3 O 4 @In 2 S 3 exhibited high adsorption and photoreduction capacities for Cr(VI) under wide pH, as well as excellent magnetic separation property. Meanwhile, the adsorption and reduction ability of Fe 3 O 4 @In 2 S 3 towards Cr(VI) maintained high level in low-valent anions system, while it significantly declined with existence of high-valent anion (PO 4 3− ). A sharp contrast between the two situations manifested that the Fe 3 O 4 @In 2 S 3 has strong anti-interference in low-valent anions system. Furthermore, cyclic experiments revealed the admirable photocatalytic activity and reusability of Fe 3 O 4 @In 2 S 3 . According to the results of adsorption and cyclic experiments, a distinctly enhanced proportion of Cr on surface of Fe 3 O 4 @In 2 S 3 in the first cycle experiment was observed, which indicated that the photocatalytic reduction of Cr(VI) probably promoted the immobilization of Cr species on Fe 3 O 4 @In 2 S 3 . XPS analysis results suggested that the Cr(VI) loaded on Fe 3 O 4 @In 2 S 3 mostly reduced to Cr(III) via photocatalytic reduction process with In 2 S 3 , and Fe 3 O 4 partly contributed to its reduction. Finally, the enhanced adsorption and reduction capacity of Fe 3 O 4 @In 2 S 3 for Cr(VI) and its easy recycling feature make it has great application potential in Cr(VI) wastewater treatment.
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Toxics
·
2025
·Vol. 13
·期 6
·458
·
IF 4.1
Hang Liu,Runlin Yao,Mingling Yu,Zongda Ye,Yingrui Lu,Xiaolong Yu,Jin Tang,Jianteng Sun
Hexavalent chromium (Cr(VI)) is of significant interest in the environmental field due to its high toxicity. Biochar is commonly used as an adsorbent for Cr(VI) removal from wastewater. However, its lower removal efficiency remains a persistent challenge. This study develops an iron-modified rice straw biochar through a simple precipitation and pyrolysis method and applies it for Cr(VI) removal in wastewater, which could convert waste into treasure and improve the adsorption performance of adsorbent. In the adsorption experiments, the results revealed that the adsorption efficiency of Cr(VI) reached 95.54% within 480 min (conditions: adsorbent dosage 2.67 g/L, pH 2.5, temperature 25 ± 2 °C). The Langmuir isotherm model was more suitable to describe the adsorption behavior of Cr(VI) by Fe-BC, and the fitted adsorption capacity achieved 10.03 mg/g. The experimental process was better described by the pseudo-second-order kinetic model, indicating that the adsorption process chemical adsorption was the rate-limiting step. The thermodynamic experiments revealed that the adsorption process of Cr(VI) by Fe-BC was spontaneous and endothermic. Column experiments demonstrated that a lower flow speed was beneficial to adsorption performance. Mechanistic studies highlighted the synergistic roles of electrostatic attraction, ion exchange, and reduction in Cr(VI) removal. These findings provide novel perspectives and innovative approaches for the development and application of adsorbents.
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CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Hainan Zhang,Shuhui Liang,Jianwei Zhang,Xiangge Han,Weiqi Zhou,Jia Gao,Yaohua Li,Shuliang Dou,Yao Li,Feifei Ren
Vanadium dioxide (VO₂) undergoes reversible metal–insulator transitions at critical temperature of 68 °C, rendering it promising for tunable electromagnetic applications. Here, Cr-doped VO₂/Ethyl cellulose (EC) composites are synthesized to raise the transition temperature to 87 °C while retaining shielding effectiveness values of 9.9–26.3 dB (X-band) and 10.2–25.2 dB (Ku-band). Notably, the surface temperature of material plateaus at 70 °C after exposure to one sun for 10 min, preventing passive phase transitions under light exposure. This work provides valuable insights into the design of intelligent electromagnetic interference shielding materials with active thermal regulation capabilities.
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PLASMA SCIENCE & TECHNOLOGY
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2025
·
IF 1.8
Ruiting Jian,Qirui Zou,Jianjun Yan,Bowen Liu,Lijun Sang,Zhongwei Liu
Cr(VI), a hazardous heavy metal pollutant found in wastewater, exerts detrimental effects on biological system and the human body. Efficient photocatalytic reduction of Cr(VI) to Cr(III) using high-performance materials offers a viable approach for chromium decontamination. In the current work, the defective UiO-66-(OH)2 with enhanced photocatalytic activity was developed by the plasma treatment. These defects not only triggered an expansion in mesoporous domains and increased the BET surface area of the UiO-66-(OH)2 system, thereby exposing more adsorption and photocatalytically active sites, but also created additional electron migration pathways, enhancing the separation of photogenerated e-/h+ pairs. When subjected to an operating power of 15 W, chamber pressure at 20 Pa, and a 300-second treatment period, UiO-66-(OH)2 exhibited a removal efficiency of 83 %. This work explored a novel way for the construction of the defective MOFs and broadened the utilizationation of MOFs in the fields of photoreduction of heavy metal ions in water.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Ruiqing Sun,Jing Yuan,Tong Zhou,Yujuan Xie,Qilong Zhan,Shiyi Lu,Haoran Fan,Yangyang Wen,Hongyan Li
Cr(VI), a highly toxic and carcinogenic contaminant, presents significant risks to ecological and human health due to its pervasive presence in food and environmental systems. Even minimal exposure can induce oxidative stress and genotoxicity, underscoring the urgent need for rapid, sensitive, and field-deployable analytical methods. In this study, we developed a ratiometric fluorescence probe based on a blue-emitting metal-organic framework (MOF) as the reference signal and a red-emitting CdTe quantum dot (QDs) as the responsive element. Upon Cr(VI) exposure, red fluorescence is quenched through inner filter effect (IFE) and electrostatic interaction (EI), while blue fluorescence remains unaltered, resulting in a visible color change from pink to blue. To achieve precise quantification, the ratiometric system was integrated with three representative ML algorithms—Random Forest (RF), Support Vector Regression (SVR), and BP Neural Network (BPNN). Smartphone-captured fluorescence images were processed by extracting RGB values to train and validate the ML models. Among them, the RF algorithm demonstrated superior performance, achieving an R 2 value of 0.9942, root mean square error of prediction of 3.5842, mean absolute error of prediction of 2.1893, and 93.31 % prediction accuracy. The proposed method achieved satisfactory recovery rates of 98.81–134.00 % and relative standard deviations below 4.32 % in real food and environmental samples. This study presents an intelligent, dual-mode strategy integrating ratiometric fluorescence sensing with machine learning for trace Cr(VI) detection. The approach offers high sensitivity, accuracy, and visual recognition, providing a generalizable platform for automated, on-site, and visualized analysis in complex food and environmental matrices.
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LANGMUIR
·
2025
·
IF 3.9
Hongxing He,Shunfei Li,Xintao Yang,Ying Xu,Siqing Ye,Haonan Dong,Mengye Yang,Ni Yang,Yi Zhang,Zhifeng Nie
Due to the low adsorption capacity, slow adsorption kinetics, and insufficient selectivity of conventional adsorbents in highly acidic environments, therefore, the removal of highly toxic Cr(VI) from industrial metallurgical wastewater remains a great challenge. Herein, a novel superhydrophilic quaternized nanofiber adsorbent was synthesized using electrospinning technology. The superhydrophilic nanofiber adsorbent facilitated water molecule movement during the adsorption process, which increased the system’s free energy and thus promoted the efficient and rapid selective removal of Cr(VI). The adsorbent was completely wetted within 0.06 s and reached a maximum adsorption capacity of 450.33 mg/g in a Cr(VI) solution with an initial concentration of 400 mg/L and equilibrated within 20 min. Adsorption experiments showed that the correlation coefficients of the pseudo-secondary kinetics and Langmuir model of the process were as high as R22 = 0.994 and RL2 = 0.971–0.993, respectively, suggesting that the adsorption process is mainly surface adsorption driven by chemisorption. Moreover, the adsorption mechanism by Zeta potential analysis and XPS and DFT simulations revealed that the selective adsorption for Cr(VI) is the synergistic action of ion exchange and coordination by electrostatic attraction. In addition, the dynamic column adsorption test demonstrated that the adsorbent could adsorb 6000 times its own mass of Cr(VI) ions in metallurgical wastewater, the recovery of Cr(VI) by nanofibers could still reach 89.7% after five cycles, and the removal efficiency was as high as 95.64% in real metallurgical wastewater, which highlighted the potential of its practical application.
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Journal of Cleaner Production
·
2022
·
IF 11.072
Zhuang Cao,Lixian Zhao,Yabing Sun,Jingwei Feng
The pollution of water by antibiotics and heavy metals has attracted more and more attention of scholars. Enrofloxacin (EFA) is a typical third generation fluoroquinolone antibiotic , which is widely used in human activities. Hexavalent chromium has been a great threat to human health and ecosystem due to its high mobility, toxicity and carcinogenicity . In this study, EFA-Cr(VI) mixed solution was used as a typical antibiotic - heavy metal simulated wastewater. We used a uniaxial wet-wall dielectric barrier discharge plasma reactor to simultaneously transform Cr(VI) and remove EFA for the first time, and its universality in the degradation of heavy metal pollution caused by other antibiotics was explored, providing a new solution for the simultaneous rapid and efficient treatment of antibiotic and heavy metal-contaminated wastewater. Within 18 min, the presence of hexavalent chromium greatly increased the degradation rate of EFA from 65.1% to 94.6%. The removal rate of hexavalent chromium was increased from 63.9% to 98.3% by the presence of EFA. The effects of initial pollutant concentration , input voltage, gas velocity , liquid circulation velocity, pH, organic matter and heavy metal ions were also investigated in this study. Free radical scavenging experiments showed that •O 2 , - •OH and 1 O played an important role in the detoxification of EFA. The Cr(VI) conversion experiments showed that the EFA degradation intermediates, hydrogen peroxide and •H were the main factors of Cr(VI) reduction in the EFA co-degradation system. The degradation pathway was inferred based on the measured EFA intermediates. The developmental toxicity of EFA and its degradation products was quantitatively studied. The results showed that the toxicity of EFA wastewater was reduced after DBD treatment.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Xueyan Li,Suya Li,Chong Peng,Yuanfei Wang,Yun Li,Shuyi Yang,E. Tao
To avoid the environmental detriment caused by Cr(VI) waste, this study constructs a dual cross-linking network structure using sodium alginate (SA) and polyvinyl alcohol (PVA). Chitosan (CS) is further introduced through electrostatic attraction and hydrogen bonding and SA/PVA/CS (SPC) composite with porous structure is successfully prepared for the removal of Cr(VI) from wastewater. Batch adsorption experiments show that SPC has excellent adsorption capacity and practical usability with a broad pH applicability range. Under optimal adsorption conditions (pH = 2, t = 150 min, T = 35 °C, m/ V = 2 g/L, C 0 = 10 mg/L), the Cr(VI) removal rate of SPC achieves 89.2 %. Adsorption kinetics and isotherm models indicate that the adsorption process is primarily multi-layer and chemical adsorption. Additionally, FT-IR and XPS reveal that the adsorption mechanism of SPC for Cr(VI) involves a synergy of electrostatic attraction, reduction, ion exchange and complexation. Density functional theory (DFT) simulations also confirm the dominant role of CS in the Cr(VI) adsorption. In summary, SPC shows great potential for Cr(VI) wastewater treatment.
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