PLASMA SCIENCE & TECHNOLOGY
·
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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高影响因子
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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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Daoyuan Nie,Rui Ma,Yanhong Zhang,Weiwei Wang,Guangze Nie,Guangbing Liu,Weijing Liu,Dong Zou
The development of an efficient and economical method to remove the toxic Cr(VI) from water is a global challenge. This study developed a new composite adsorptive membrane by combining polyacrylonitrile (PAN) as a substrate with crosslinked polyethyleneimine (PEI) to efficiently remove Cr(VI) from wastewater. After optimizing the preparation conditions of the material, the Cr(VI) removal by PEI/GMA@PAN was investigated using batch adsorption and longer-term filtration experiments. The composite adsorptive membrane exhibited a high adsorption capacity, reaching a maximum of 89.16 mg/g, along with fast adsorption kinetics that achieved equilibrium within 100 min for Cr(VI) removal. Even in the presence of coexisting ions, PEI/GMA@PAN membrane maintained a high efficiency in removing Cr(VI). The removal mechanism mainly relied on electrostatic interactions and the reduction of Cr(VI) to Cr(III). Notably, long-term filtration experiments substantiated the membrane's effectiveness in removing Cr(VI) from synthetic wastewater, with an impressive treatment volume of 342 L/m 2 . The optimized PEI/GMA@PAN membrane also demonstrated low PEI leaching across a wide pH range and the potential for re-utilization through four-round cycles, underscoring its promising applicability in wastewater treatment. Therefore, the newly synthesized composite membranes show potential for the removal of Cr(VI) from wastewater.
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高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 14
·4570-4577
·
IF 4.174
Xing Xin,Na Hu,Yuanyuan Ma,Yali Wang,Lin Hou,Heng Zhang,Zhangang Han
It is crucial to find a convenient and sensitive method for quantitative determination of heavy metal chromium(VI) ions. Developing crystalline materials coupled with polyoxometalates as an electrochemical sensor is a promising approach to address the above issues. Here we reported two reductive polyoxometalate-based crystalline compounds with the formula of (H2bpp)2[Na4Fe(H2O)7][Fe(P4Mo6O31H6)2]·2H2O (1) and (H2bpp)6(bpp)2[Fe(P4Mo6O31H8)2]2·13H2O (2) (bpp = 1,3-bi(4-pyridyl)propane). Structural analysis indicated that both two compounds were composed of inorganic polyanionic clusters and organic protonated bpp cations. The difference lies in the arrangement mode of the inorganic moiety: crystal 1 shows a unique three-dimensional (3-D) inorganic porous skeleton, while crystal 2 consists of isolated 0-D polyanionic clusters. When used as electrochemical sensors in the determination of trace Cr(VI), crystal 1 shows a broad linearity range (2–2610 μM) with a low limit of detection (LOD) of 0.174 μM (9 ppb), which is superior to that of compound 2 (a LOD of 0.33 μM) and meets the standard of Cr(VI) in drinking water set by the WHO (less than 0.962 μM or 50 ppb). Importantly, crystal 1 showed benign selectivity to Cr(VI) in the presence of various heavy metal ions and good reproducibility in a real water sample, which prove its strong anti-interference ability. In addition, experimental results showed that the spatial arrangement of polyanionic clusters could affect the final electrochemical behavior of crystalline materials. This work provides some insights into the design of cost-effective POM-based electrochemical sensors at the molecular level.
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 5
·1257-1267
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IF 3.146
Cheng Liang,Zhang Li,Wang Hongxia,Song Fangxiang
Mesoporous silica (MS) and graphene oxide (GO) are good absorbents. Combining them not only prevents GO agglomeration but increases the number of MS active sites. In addition, their composites can preferentially adsorb specific pollutants after modification. In this work, amino-modified GO/MS materials were prepared by post-grafting to remove Congo red (CR) and Cr(VI) in solution. Characterization methods, such as X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Zeta potential, and N 2 adsorption/desorption, were adopted. The prepared GO/MS@HBP has a porous structure with a specific surface area of 49.32 m 2 ·g −1 . The effect of initial concentration, pH, adsorption time, temperature and other ions was determined on the adsorption amount. Relying on this, the GO/MS@HBP maximum capacity for Cr(VI) and CR adsorption are 93.73±2.3% and 257.69+1.5% mg·g −1 , respectively. Pseudo-second-order kinetic and Langmuir isotherms are more suitable to describe the adsorption process, indicating that chemical adsorption plays a major role in the entire adsorption process. Thermodynamics showed that the enthalpy (H) of materials adsorbing two pollutants was positive and that the Gibbs free energy (G) was negative, suggesting that Cr(VI) and CR adsorption on GO/MS@HBP was spontaneously endothermic. GO/MS@HBP could simultaneously remove CR and Cr(VI) in solution, and be an effective adsorbent for removing harmful substances.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Yunhao Xie,Lun Lu,Baoliang Chen
The demands for genuine remediation of heavy metal contaminated soil have triggered extensive studies in the soil washing method. However, numerous soil washing methods show poor sustainability for target soil, due to the tremendous cost, hidden secondary pollution and severe soil deterioration. Here, an asymmetrical alternating current electrochemically-mediated remediation platform (ACRP) is developed by fabricating an amidoxime-functionalized electrode (Ami-electrode). The real soil contaminated with 1200 mg/kg Cr(VI) is remediated efficiently to less than safety level (30 mg/kg), meanwhile no exorbitant soil nutrient loss is observed and no secondary pollution occurs. Furthermore, the consumption of washing effluents for the ACRP method is 24 times lower than the traditional washing method. Ami-electrode with asymmetrical alternating current promote the electrocatalytic efficiency by inhibiting the Coulomb repulsion between Cr(VI) species and cathode. With the aid of Ami-electrode and positive bias, Cr(VI) species in effluents are adsorbed on chelating site. By subsequent negative bias, Cr element is reduced and recycled in the less hazardous form of amorphous Cr(III) hydroxide, and effluents are regenerate concurrently in a cyclic system. Durability experiment and cost calculation verify the exceptional sustainability and feasibility for remediation practices. This work provides a sustainable remediation method for Cr(VI)-contaminated soil, and then paves the way to develop electrochemically soil remediation platform for practical applications.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Xiaodong Wang,Yongxun Dai,Chen Tian,Huize Zhang,Xiwen Li,Wenlong Liu,Weibing Li,Shaoping Kuang,Hongtao Tong
Photocatalysts can be effectively recovered and reused by compounding with magnetic nanostructures. How to further improve the photocatalytic performance of magnetic heterojunction photocatalysts remains a great challenge. In this work, g-C 3 N 4 /ZnFe 2 O 4 (CN/ZFO) magnetic heterojunction photocatalyst was first prepared and then modified with ultrathin MoS 2 (CN/ZFO/MoS 2 ) by simple ball-milling method. Then the photocatalytic removal of Cr(Ⅵ) performance of the prepared series photocatalysts was evaluated in detail. The optimum CN/ZFO/MoS 2 can achieve 99.3% Cr(Ⅵ) removal under 200-min simulated sunlight illumination, which is much higher than CN/ZFO (54.0%). The enhanced photocatalytic performance benefits from the modification of MoS 2 , which improves the light absorption performance, facilitates the transfer of photogenerated carriers , increases the concentration of photogenerated carriers and promotes the effective separation of photogenerated carriers. This work provides a theoretical basis for further preparation of magnetic recyclable photocatalysts with high photocatalytic performance.
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高影响因子
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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高影响因子
Nanoscale Research Letters
·
2021
·Vol. 16
·期 1
·1-12
·
IF 4.703
Ma Xiao Li,Fei Guang Tao,Xu Shao Hui
Abstract In this study, polyaniline (PANI) is prepared by means of chemical oxidization polymerization and directly loaded on the modified fiber ball (m-FB) to obtain macroscale polyaniline/modified fiber ball (PANI/m-FB) composite, and then its removal ability of Cr(VI) is investigated. The effects of different parameters such as contact time, pH value and initial concentration on Cr(VI) removal efficiency are discussed. The experimental results illustrate that the favorable pH value is 5.0 and the maximum removal capacity is measured to be 293.13 mg g −1 . Besides, PANI/m-FB composites can be regenerated and reused after being treated with strong acid. The kinetic study indicates that the adsorption procedure is mainly controlled by chemical adsorption. More importantly, the macroscale of composites can avoid secondary pollution efficiently. Benefiting from the low cost, easy preparation in large scale, environmentally friendly, excellent recycling performance as well as high removal ability, PANI/m-FB composites exhibit a potential possibility to remove Cr(VI) from industrial waste water. Graphic Abstract The polyaniline (PANI) was coated on modified fiber ball (m-FB) to remove Cr(VI) in waste water, and this kind of PANI/m-FB composites can avoid secondary pollution efficiently due to its macrostructure. Furthermore, the removal capacity can reach to 291.13 mg/g and can be multiple reused.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Shaojun Li,Xiaoxuan Fan,Zhongping Chen,Lei Bai
A nanosized zeolitic imidazolate framework-67 (ZIF-67) was employed for the adsorption of Cr(VI) under a neutral solution. It was discovered that the ZIF-67 demonstrated a high adsorption of Cr(VI) for the first (43.1 mg·g –1 ) and second run (40.2 mg·g –1 ). However, a self-sacrifice process of ZIF-67 was evidenced, possibly due to the oxidability of Cr(VI) and pH change, which resulted in a dramatically decrease of adsorption ability in the third run (16.6 mg·g –1 ). The adsorption process and its kinetics fitted the Langmuir model and pseudo-second-order rate equation and a multiple adsorption process was suggested.
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高影响因子
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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高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 47
·16525-16531
·
IF 4.029
Fu-hua Wei,Ding Chen,Zhao Liang,Shuai-qi Zhao,Yun Luo
Fe-Based metal–organic frameworks (Fe-MOFs) were prepared with trimesic acid and FeSO4·7H2O via a microwave-assisted ball milling approach. The structure and thermal stability of the as-prepared Fe-MOFs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FTIR), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). When used to degrade 20 mg L−1 hexavalent chromium in aqueous solution, the Fe-MOFs were found to completely reduce a 100 mL solution within 120 min under natural light and a 400 mL solution within 90 min under Xe lamp irradiation. Under natural sunlight, 98% of the Cr(VI) was removed from a 40 mL solution after 40 min.
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高影响因子
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