CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yanfang Li,Kang Xu,Huilin Hu,Lixia Jia,Yizhong Zhang,Ciren Zhuoga,Pengli Yang,Xin Tan,Wanqian Guo,Weichang Hao,Tao Yu,Jinhua Ye
Constructing atomic-level cation vacancies is an effective strategy to modulate the electronic properties of host materials, thus promoting charge transfer and redox reaction kinetics. Herein, ultrathin Bi 24 O 31 Br 10 nanosheets with cationic vacancy was synthesized via an inventive precipitation strategy by adding appropriate arginine. The difunctional arginine can changes the pH of the synthetic system and selectively deprive Bi atoms on the surface to form Bi vacancies through strong affinity between functional groups and cations. The abundant Bi vacancy decrease the Gibbs free energy change and provide channels to promote bulk adsorption of Cr(VI), thus effectively reduces the carrier migration distance during in situ bulk photocatalytic reduction of Cr(VI) and induces the formation of new impurity states to improve the utilization of visible light. Bi vacancy mitigates strong excitonic effects confined by significantly reducing exciton binding energies, thus effectively promote the separation of photo-generated charges and suppress reorganization of photon-generated carrier. Benefiting from these merits, these exclusive V Bi -Bi 24 O 31 Br 10 ultra-thin nanosheets exhibit superior reduction performance for Cr(VI), and the removal rate was more than 90% at universal pH (2–10). This work provides a new idea for the construction of cation vacancies and a feasible method for the removal of Cr(VI) under alkaline conditions.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Hua-Rong Yang,Shan-Shan Li,Chen Yang,Qing-Da An,Shang-Ru Zhai,Zuo-Yi Xiao
Here, we have developed a novel bilayer hollow amphiphilic biosorbent (BHAB-3) with large adsorption capacity, rapid adsorption kinetics, and cost-effective for the removal of Cr(VI) and Cu(II) from aqueous solutions. The synthesis was based on the clever use of freeze-drying to fix the structure, secondary modification of the carboxymethyl cellulose microspheres with polyethyleneimine and cross-linking by glutaraldehyde. The consequences of pH, initial concentration, contact time and temperature on adsorption were investigated. The Langmuir model fits showed that the maximum adsorption capacities of the two target heavy metal ions reached 835.91 and 294.79 mg/g, respectively. Moreover, BHAB-3 was characterized by SEM, FT-IR, TGA, and XPS synergistically, showing that it exhibits a strong complexation ability for Cu(II) and a strong electrostatic effect for Cr(VI). Adsorption and desorption experiments showed only a slight decrease in the adsorption capacity of the BHAB-3 for Cr(VI) and Cu(II) ions after 5 and 26 cycles, respectively. Given the excellent properties of this adsorbent, it is a promising candidate for heavy metal ion removal.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yuxuan Zhao,Yueli Wen,Xiaonuo Xu,Maohong Fan,Shiyun Guo,Zhiju Chen,Xiaoxiao Zhao,Bin Wang,Wei Huang
The heavy metals discharged from electroplating wastewater, represented as copper and chromium ions, is harmful to aquatic lives and human beings, and will break the ecological balance. In this work, magnetic hybrid porous structure adsorbent of Fe 3 O 4 @SiO 2 -UiO-66-EDTA is prepared for recycling copper and chromium ions. The adsorbent exhibits a maximum adsorption capacity of 212.10 mg/g for Cu(II) and 118.10 mg/g for Cr(VI). Notably, it shows excellent regenerability of 87.12% after 5 cycles. The adsorption of Cu(II) and Cr(VI) on Fe 3 O 4 @SiO 2 -UiO-66-EDTA follows the pseudo-second-order model, where chemical adsorption is dominant and it occurs spontaneously and exothermally. Based on XRD, FTIR, XPS, and DFT calculations, the adsorption mechanisms are driven by electrostatic attraction, chelation, and redox reactions. This work provides a novel and promising strategy for designing highly efficient adsorbents, paving the way for more effective treatments of electroplating wastewater contaminated with Cu(II) and Cr(VI).
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Chuanjin Lin,Qia Guo,Bin Dong,Zuxin Xu
Sludge hydrochar used for chromium-contaminated soil remediation is susceptible to natural aging with soil minerals, which may alter its electrochemical properties and affect its remediation performance. In this study, the effect of co-aging with soil minerals (soluble mineral salts [FeCl 3 , MnCl 2 , AlCl 3 , and CaCl 2 ] and clay minerals [kaolinite]) on the redox activity of sludge hydrochar for Cr(VI) reduction was investigated. The subsequent aging process revealed that Fe 3+ and Al 3+ ions oxidized the stabilized alkanes to functional groups with high electron-donating capacities, such as -OH and C-O, because of their oxidizing properties or electron-mediating facilitated by the formation of the crystal structure, while enhancing the electron-donating and electron-mediating capacities of the co-aging hydrochar. However, Mn 2+ was easily oxidized to Mn(III) and Mn(IV), which protected alkanes from oxidation. Simultaneously, Ca 2+ and kaolinite were encapsulated on the hydrochar surface, hindering electron-mediating during oxidation. None of the three substantially enhanced the electron-donating capacity of the hydrochar during the co-aging process. Because of the richness of soil minerals, it is vital to consider redox reactions as a critical factor when applying hydrochar for soil remediation.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Bifang Zheng,Yi He,Shuangqin Tian,Shujie Wang,Lihong Tang
The combination of bamboo fiber (BF) with chitosan (CS) in aerogels to capture heavy metals from contaminated water has not yet been previously reported. In this study, we used a straightforward sol–gel followed by freeze-drying method to fabricate a biomass composite aerogel using waste BF and CS (BF/CSA). This material is low-cost, eco-friendly, and recyclable. In particular, the BF/CSA-2 exhibited excellent mechanical strength and strong acid resistance. It effectively adsorbed Cr(VI) at pH=2 and Cu(II) at pH=5, achieving removal efficiencies of 94% and 85%, respectively. The corresponding maximum adsorption capacities were 162.10 and 138.97 mg/g. BF/CSA-2 exhibited a high removal efficiency (>70 %) after five consecutive reuse cycles. The chemisorption mechanism was confirmed through adsorption isotherms and kinetic analysis. In addition, density functional theory (DFT) calculations revealed adsorption energies of −196.473 and −121.964 kcal/mol for Cr(VI) and Cu(II), respectively, on BF/CSA-2. Based on experimental characterization and theoretical calculations, the removal mechanism involves complexation, electrostatic attraction, and reduction. This study presents a promising advancement toward the development of scalable and sustainable biomass-based aerogels for water purification.
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CHEMICAL ENGINEERING JOURNAL
·
2014
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IF 4.058
Zhi-yun Kong,Jun-fu Wei,Yong-hua Li,Na-na Liu,Huan Zhang,Yue Zhang,Li Cui
The quaternary ammonium fibers which could remove Cr(VI) ions rapidly were prepared by radiation-induced grafting of 2-(dimethylamino)ethyl methacrylate (DMAEMA) onto polypropylene (PP) fibers (PP-g-DMAEMA) and modifying with 1-bromoalkanes. The FTIR, FESEM, XPS and TG-DTG spectra manifested that the quaternary ammonium group was introduced onto the surface of PP fibers. The main factors influencing the adsorption of Cr(VI) ions including contact time, pH of the aqueous solution and adsorption dosage were investigated. The removal rate could reach 97% within 4 min and the kinetics study indicated that adsorption process was surface reaction controlled. Maximum adsorption capacities of Cr(VI) ions at 25 °C were 105.8 mg/g based on the Langmuir isotherms. These results suggested that the quaternary ammonium fibers have potential application for the removal of hazardous metal pollutants from wastewater highly and rapidly.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Kaihua Su,Dongmin Zhao,Ai Lu,Chaoran Zhong,Xing-Can Shen,Changping Ruan
Hexavalent chromium Cr(VI) is one of the most toxic heavy metal pollutants in water due to its high water solubility, high toxicity, strong mutagenicity and carcinogenicity . To enable efficient Cr(VI) removal from wastewater, it remains difficult to fabricate advanced adsorbents with good selectivity and high adsorption capacity in large scale. Herein, a poly(hexamethylenediamine-tannic acid)-bacterial cellulose (denoted as HTA-BC) composite was prepared by using natural raw materials with abundance, low cost and nontoxicity in a facile one-step method and applied for the decontamination of highly toxic Cr(VI). The as-synthesized HTA-BC functionalized with abundant amino and phenolic hydroxyl groups had demonstrated high capacity (534.8 mg g −1 ) and good selectivity for Cr(VI) scavenging. Notably, the treatment of real water samples with the HTA-BC composite could efficiently reduce the concentration of the spiked Cr(VI) below the acceptable levels for drinking water . Moreover, high-purity Cr 2 O 3 was obtained by calcination of the Cr species-laden HTA-BC to ensure that the toxic Cr(VI) residing in the spent adsorbents can’t leak out into the surroundings, thus avoiding the secondary pollution. The natural abundance, low cost, easy availability, and sustainability of the raw materials, combined with the facile and green synthesis endowed the HTA-BC composite with great potential for not only decontaminating Cr(VI) wastewater, but also recycling Cr by calcination of the Cr-laden HTA-BC. Moreover, no secondary pollution would be brought during the synthesis and the post-treatment after the Cr(VI) removal, thus it is expected to be a green and sustainable approach for the purification of Cr(VI) containing wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhiliang Chen,Yaoyu Luo,Chuixiu Huang,Xiantao Shen
Designing a novel type of imprinted photocatalysts for selective photoreduction of highly toxic pollutants is extremely needed in semiconductor photocatalysis. In this work, imprinted photocatalysts (named ZnO/GO-MIPs) were synthesized via Pickering emulsion polymerization by in situ assembling ZnO/GO composites on the synthetic molecular receptors (MIPs). The experimental data showed that the ZnO/GO-MIPs owned specific affinity towards the target Cr(VI) in aqueous solution with an imprinting factor ( IF ) of 1.6. Under the illumination of visible light, the ZnO/GO composites could selectively photoreduce the Cr(VI) adsorbed by the MIPs. In comparison with the ZnO/GO catalysts under light illumination, the ZnO/GO-MIPs showed a 15 fold increase in photoreduction of Cr(VI). Mechanism study indicates the photoreduction of Cr(VI) by the ZnO/GO composites was occurred at the interface between the solid MIP core and the aqueous solution. Compared to the ZnO-MIPs and the GO-MIPs, the ZnO/GO-MIPs clearly showed interfacial synergistic catalysis effect. To the best of our knowledge, this is first time that selective photoreduction of highly toxic pollutants at the solid-water interface by the ZnO/GO-MIPs was achieved. We believe the ZnO/GO-MIP catalysts have great potential in interfacial synergistic catalysis in environment and catalysis fields.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Hiba Shaghaleh,Yousef Alhaj Hamoud,Qin Sun,Mohamed S. Sheteiwy,Hamada AbdElgawad
Soil flushing and adsorption-based soil remediation are promising options for removing heavy metals in agricultural soil. However, they encounter limitations in low removal efficiency, secondary pollution potential, or the need for a purification/recovery process. Optimizing flushing solutions or the functional properties of adsorbents could fundamentally eliminate the drawbacks of these methods. Yet, their practical application remains a formidable challenge. Herein, a new combined remediation strategy of multiple-pulse water soil flushing (MF) with novel aminated cellulose nanofibers (A-NFCs)/AEM/AM@MIL-100(Fe) nanocomposite hydrogel adsorbent (ANCMH) was adopted to remove Cr(VI) from agricultural soil. The characteristic analyses approved Cr(VI) adsorption-coupled reduction/swelling-based mechanisms on ANCMH with the maximum theoretical adsorption capacity of 338.24 mg g −1 at pH 6.8 governed by pseudo-second-order and Freundlich models. Instead of conventional MF application using environmentally problematic extractant fluids, a 5-day soil column simulation trial of MF coupled with ANCMH adsorbent layers (MF@ANCMH) was applied in medium-to-highly Cr(VI)-contaminated soil followed by easy ANCMHs separation, preventing secondary pollution. Innovatively, the water flushing-stop flux events favorably decreased the pH of neutral soil by 0.83 folds and allowed Cr(VI) release from the soil matrix to be adsorbed by ANCMHs, achieving a high Cr(VI) removal efficiency of 98.9 %. Compared to the soil treated with ANCMH individually and soil flushed with water or Na 2 EDTA, the MF@ANCMH-treated soil reached the corresponding regulation of permissible levels for Cr(VI) residential scenarios in agricultural soil of 5.6 ppm with 3-cycles of ANCMH reuse. The residual Cr in MF@ANCMH-remediated soil displayed minimal bioavailability at root-zoon soil of ≤4.2 ppm and a 97.66 % reduction in its exchangeable-carbonate fraction compared to untreated soil, corresponding to a risk assessment code score below 1 %. Also, the application of MF@ANCMH resulted in Cr bioaccumulation below 0.1 ppm in cultivated wheat plants, prevented the physiological phytotoxicity symptoms, and elevated their antioxidant enzyme activity, photosynthesis, growth, and yielding indicators compared to that grown in untreated soil. Furthermore, it improved soil organic matter, microbial community, diversity, and microecological functions. This study provides a promising alternative remediation strategy for neutral soil that can maintain soil/crop quality and soil health with high chemical/environmental stability of pollutants after remediation, demonstrating its sustainability and feasibility in agricultural soil.
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高影响因子
Scientific Reports
·
2025
·Vol. 15
·期 1
·1-16
·
IF 3.9
Zhang Fengrong,Liu Luxing,Zhang Cuilan,Shang Dawei,Wu Lishun
A novel adsorbent ZnAl–LDHs/SiO 2 (ZA/SiO 2 ) was prepared by blending urea mixture of ZnSO 4 and Al 2 (SO 4 ) 3 while using SiO 2 as a support form. The adsorption properties of ZA/SiO 2 for the removal of toxic metal ions (Cu(II) and Cr(VI)) from water were evaluated. By batch experiment method to investigate the ZA/SiO 2 adsorption of Cu(II) and Cr(VI) solution treatment effect. The sorption kinetics curves of Cu(II) and Cr(VI) on ZA/SiO 2 were L-shaped. What’s more, the solid concentration effect was found in the process of sorption kinetics. Langmuir and Freundlich sorption isotherm models were used to analyze the adsorption data. The results showed that the adsorption conforms to Langmuir and Freundlich adsorption isotherm models. However, the adsorption capacity of ZA/SiO 2 compounds for Cu(II) and Cr(VI) is greatly improved. The adsorption capacity of Cu(II) is 158 mg·g −1 and of Cr(VI) is 176 mg·g −1 , which were 3.6 and 1.8 times of ZnAl-LDHs (ZA), respectively. Density functional theory (DFT) was utilized for the analysis of intrinsic mechanism and specific pathways. The primary mechanism for removing Cr(VI) from water mainly included the intercalation of Cr 2 O 7 2− and exchange between Cr 2 O 7 2− and OH − , excluding Cr(OH) 3 precipitation. Regarding the primary mechanism for eliminating Cu(II) from water, it involves isomorphic substitution as the predominant process, except for the formation of Cu(OH) 2 precipitates.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Shihui Wang,Yuzhou Xia,Guiyang Yan,Meixia Chen,Xuxu Wang,Ling Wu,Ruowen Liang
Inspired by the concept of frustrated Lewis pairs (FLPs) from homogeneous catalysis, an organic supramolecular bridged metal-organic frameworks (MOFs) heterojunction, i.e., a perylene-3,4,9,10-tetracarboxylic diimide@MIL-125(Ti)-NH 2 (denoted PDI@MTi) composite is successfully fabricated via a two-step synthesis method. Experimental characterisations and theoretical calculations reveal that in the obtained “TiO 5−x -ligand-PDI” FLPs, the unsaturated Ti-O clusters function as a Lewis acid to accept photogenerated electrons, and the PDI sites act as a Lewis base to capture photogenerated holes. With the unique structure characteristics, the PDI@MTi shows excellent photocatalytic activity toward the disinfection of Staphylococcus aureus and Cr(VI) reduction, with 1.0- and 10.3-fold enhancements, respectively, compared with unadorned MTi. The synergic effects of the micro polarisation field, multiple active sites, and a C-N bonded interface contributed to photoactivity enhancement. This work demonstrates the potential of using MTi as a platform for constructing FLPs-containing heterogeneous photocatalysts and provides new strategies to control carrier separation.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Meimei Zhou,Wei Zou,Xuemei Zhu,Huachen Ma,Pengbo Wang,Jiaxin Shang,Pingping Luo
UIO-66-NH 2 was successfully deposited on electrospun polyacrylonitrile (PAN) nanofibers treated by thermal oxidative stabilization (TOS) via a simple and effective in situ growth method. Owing to the formation of acridone rings, naphthyridinering rings and hydronaphthyridine rings during the TOS process, the thermally stabilized electrospun PAN (TSPAN) nanofibers were greatly improved in stability and heat resistance and could provide adequate nucleation points for MOFs growth, indicating an ideal MOFs deposition support without additional surface modifications. The results demonstrated that UIO-66-NH 2 crystals distributed relatively uniform and dense on the TSPAN nanofibers with mass loading up to 28.1 wt%. Compared with powdered UIO-66-NH 2 , the formed UIO-66-NH 2 @TSPAN nanofibers showed enhanced visible light driven photocatalytic activity towards reduction of Cr(VI) due to the improvement of visible light response, more excellent photothermal conversion ability and the increase of exposed active sites. The photocatalytic reduction rate of Cr(VI) over UIO-66-NH 2 @TSPAN was up to 93% within 180 min and the rate constant (k = 0.1362) was 2.3 times that of powdered UIO-66-NH 2 (k = 0.00576). Significantly, the mechanical flexibility and structural stability endowed the nanofibrous photocatalyst easy operation and outstanding reusable capability. The photocatalytic activity for Cr(VI) reduction still preserved 90% after five cycles. This work proposes a facile strategy for preparation of free-standing MOFs nanofibers and provides MOFs-based photocatalysts a new opportunitie for broad applications in water treatment.
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