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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高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Junling Duan,Li Zhao,Wei Lv,YiJing Li,Yuanhong Zhang,Shiyun Ai,Lusheng Zhu
The g-C 3 N 4 /Fe 3 O 4 nanocomposites with good fluorescence and magnetic property were designed and prepared for simultaneous detection and separation of trace Cr(VI) in water. The g-C 3 N 4 /Fe 3 O 4 nanocomposites based fluorescent sensor for Cr(VI) showed high sensitivity and selectivity. The linear response range of Cr(VI) was found to be 0 to 600 μM with a detection limit of 0.5 μM. In addition, the g-C 3 N 4 /Fe 3 O 4 as a novel adsorbent had effective removal towards Cr(VI). The adsorption capacity could reach 59.2 mg/ g. Furthermore, the g-C 3 N 4 /Fe 3 O 4 nanocomposites displayed superparamagnetic properties, allowing them to be easily separated from the liquid phase via an external magnetic field .
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SEPARATION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.2
Xuezhen Feng,Chunyan Liang,Jingang Yu,Xinyu Jiang
A binary composite consisting of graphene oxide (GO) and polyethylenimine (PEI) was fabricated by a facile physical mixing. Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscope (FE-SEM), thermo-gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and Zeta potential were used to characterize the prepared graphene oxide-polyethylenimine composite (GOPC). A series of experiments were carried out to investigate the effects of some important parameters, such as molecular weight of PEI, pH, time and temperature, on the adsorption efficiency of GOPC. Due to the high amine density of GOPC, its adsorption for Cr(VI) occurred more easily at lower pH mainly via electrostatic interaction. The adsorption process matched well with the Langmuir isotherm model and the pseudo-second-order kinetic model. The maximum adsorption capacity from the Langmuir model was 370.37 mg/g at pH 2.0 and 45°C for GOPC. Thermodynamic parameters revealed spontaneous and endothermic nature of the Cr(VI) adsorption onto GOPC. The main adsorption mechanism of GOPC toward Cr(VI) was electrostatic interaction. The adsorption-desorption experiments suggested GOPC was easily recycled and its stable adsorption capacity endowed it great potential as an adsorbent of Cr(VI) from wastewater.
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Desalination and Water Treatment
·
2024
·
IF 1
Pan Hu,Jing Wang,Ruihua Huang
In this study, batch adsorption study was utilized in evaluating the potential suitability of quaternized chitosan immobilized bentonite (BT) as an adsorbent in the adsorption of anionic pollutants, Cr(VI), and methyl orange (MO) from aqueous solutions. The adsorptive behaviors of Cr(VI) and MO were examined as a function of the ratio of quaternized chitosan to BT, adsorbent dosage, solution pH, initial Cr(VI) (or MO) concentration, and contact time. The adsorption equilibrium for both Cr(VI) and MO was reached quickly. Adsorption isotherms for Cr(VI) and MO were well described by the Langmuir isotherm, while the pseudo-second-order kinetic model provided good kinetic data fitting. Furthermore, the results show that this adsorbent exhibited higher adsorption capacity for MO than Cr(VI). It appears that this anionic Cr(VI) favored the electrostatic interactions with this adsorbent while the anionic MO dye may interact with this adsorbent by electrostatic interactions and the hydrogen bonding.
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RSC Advances
·
2025
·Vol. 15
·期 49
·41351-41363
·
IF 4.6
Meijuan Kuang,Qi Qin,Yun Li,Jiayi Lian,Changjiang Yu,Hui Yu,Tiantian Peng,Zhenya Jia,Xiaomao Song,Liantong Wang
Nanoscale zero-valent iron–biochar (BC@Fe) composites were synthesised via a one-step carbothermal method, followed by sulphidation to obtain sulphided BC@Fe (S-nZVI/BC-C-X) composites. Sulphidated nanoscale zero-valent iron–biochar (S-nZVI/BC-B-X) was also prepared using a one-step sodium borohydride reduction method. Batch experiments were conducted to investigate the effects of adsorption time, initial Cr(VI) concentration, pH and background ions on the Cr(VI) removal performance of S-nZVI/BC-C-X and S-nZVI/BC-B-X. A comparative analysis of their adsorption characteristics and removal efficiencies was conducted. The adsorption mechanisms were further elucidated through kinetic and isotherm model fitting, masking experiments and characterisation of the composites before and after Cr(VI) adsorption. The findings revealed that Cr(VI) removal by S-nZVI/BC-C-5 primarily occurred via (i) reduction of Cr(VI) to Cr(III) by FeS, FeS2 and Fe0, (ii) reduction of Cr(VI) to Cr(III) by Fe2+, (iii) reduction of Cr(VI) to Cr(III) by HS− released from FeS corrosion and (iv) adsorption of Cr(VI) by S-nZVI/BC-C-5.
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MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 5.2
Abdelazeem S. Eltaweil,Nouf Al Harby,Mervette El Batouti,GopiKrishna Pasam,Mazin Al Kitani,Eman M. Abd El-Monaem
In this study, the adsorption capability of green algae-derived biochar was enhanced by integrating with iron sulfide, creating the FeS 0.66 @GA-BC 0.33 composite. The magnetic FeS 0.66 @GA-BC 0.33 composite exhibited excellent adsorption performance toward Cr(VI) with a maximal adsorption capacity of 423.73 mg/g. Surprisingly, the FeS 0.66 @GA-BC 0.33 composite showed fast adsorption, with an equilibrium time of 60 minutes. Furthermore, batch experiments showed that the maximum removal efficiency of Cr(VI) by FeS 0.66 @GA-BC 0.33 was 92.39% at pH 3, 20 °C, and an adsorbent dose of 0.01 g. The kinetic analysis indicated that the pseudo-second-order model best described the adsorption process, while the isotherm results showed good agreement with both the Langmuir and Freundlich models. A combination of response surface methodology (RSM) and Box–Behnken design (BBD) was used to optimize the adsorption of Cr(VI) onto FeS 0.66 @GA-BC 0.33 . The independent variables were adsorbent dose (5–30 mg), initial Cr(VI) concentration (50–300 mg/L), and contact time (1–120 min). Analysis of variance (ANOVA) showed that the maximum removal efficiency reached 99.09% at an adsorbent dose of 17.5 mg, an initial Cr(VI) concentration of 50 mg/L, and a contact time of 120 min. The Cr(VI) adsorption mechanism was proposed based on the X-ray photoelectron spectroscopy spectra of fresh and used FeS 0.66 @GA-BC 0.33 composites, suggesting the governing reduction reaction, electrostatic interaction, and coordination bond pathways on the adsorption of Cr(VI).
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HYDROMETALLURGY
·
2026
·
IF 6.3
Ronghao Liu,Yongqi Yang,Fan Wang,Yingrui Zhuang,Yangyang Wang,Yanzhao Yang
The hydrogen bond interactions between TOPO and different HBDs were studied. • The maximum extraction capacity of HDES based on TOPO to Cr(VI) reached 187 mg/g. • The extraction mechanism of Cr(VI) can be inferred as ion association mechanism. • The mass transfer rate of extraction is controlled by the diffusion action. • Chromium(VI) loaded DES phase can be separated by using 0.12 mol/L Na 2 SO 3 . Efficient and environmentally friendly treatment of Cr(VI) in water is essential for enhancing aquatic ecosystems. In this work, hydrophobic deep eutectic solvents based on trioctylphosphorus oxide were used for efficient extraction and recovery of Cr(VI) from the acidic aqueous phase. By using binary phase diagram analysis and molecular dynamics simulation, the hydrogen bond interactions between hydrogen bond donors (decanoic acid, decanol and thymol) and TOPO were studied. The experimental results demonstrated that 0.1 g HDES achieved over 95% extraction efficiency from a 3.0 mL 500 mg/L Cr(VI) solution at pH = 0.5. And the maximum extraction capacity reached 187 mg/g. Furthermore, the extraction process was largely unaffected by variations in anions. Combined with the characterization of FT-IR and UV–vis, the extraction mechanism of Cr(VI) by HDES can be inferred as the ion association mechanism. Thermodynamic revealed that the extraction process is spontaneous and characterized by a decrease in endothermic entropy. Mass transfer at the interface appears to control the diffusion rate. Notably, when 0.12 mol/L Na 2 SO 3 was used as the stripping agent, the HDES maintained stable extraction performance over eight extraction-regeneration cycles. This study offers a promising strategy for the efficient, sustainable extraction of Cr(VI) using a novel green solvent. Download: Download high-res image (177KB) Download: Download full-size image
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Materials
·
2025
·Vol. 18
·期 13
·2930
·
IF 3.2
Xinyu Yang,Yan Mu,Lina Zhang,Dan Sun,Tiantian Jian,Weiliang Tian
In order to develop an efficient, environmentally friendly heavy metal ions adsorbent, the amino-modified expanded vermiculite-supported nano zero-valent iron (nZVI@PEI/EVMT) was prepared by using polyethyleneimine (PEI) as the functional reagent and expanded vermiculite (EVMT) as the carrier. The characterization results of nZVI@PEI/EVMT confirm that the PEI modification did not destroy the crystal configuration of EVMT, and when nano zero-valent iron (nZVI) was successfully loaded onto the PEI/EVMT surface, the value of saturation magnetic field was 41.5 emu/g, which could be separated from solution with magnet. The performance of Cr(VI) adsorption onto nZVI@PEI/EVMT was studied, showing that the ideal mass ratio for nZVI@PEI/EVMT was 1:1, and the removal capacity was largest when solution pH was 2. After four adsorption–desorption cycles, the adsorption amounts remained 40.1 mg/g. The Cr(VI) adsorption onto nZVI@PEI/EVMT was more consistent with a pseudo-second-order kinetics equation. Isotherm adsorption data accord with the Langmuir model, which suggests that the adsorption was the monolayer, the maximum adsorption amount was 116.2 mg/g at 30 °C and pH 2, and the adsorption was spontaneous and endothermic. It was inferred that the adsorption mechanisms included electrostatic attraction, reduction, chemical complexation, and co-precipitation.
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WATER RESEARCH
·
2025
·
IF 12.4
Jiaqi Bai,Lie Liu,Xiaoqiang An,Qingwen Tang,Huachun Lan,Huijuan Liu,Jiuhui Qu
Ionic contaminants, especially heavy metal ions, are a significant challenge for ensuring the safety and quality of drinking water. Electrosorption and membrane separation are effective technologies to remove ionic contaminants; however, the constant electricity demand and lack of selectivity limit their further application. In this study, a low-pressure membrane with an electrically tuning surface charge was developed for the selective and efficient removal of hexavalent chromium (Cr(VI)) from water. Poly(vinyl ferrocene) (PVF) was used to fabricate an electrically responsive interface, and an activated carbon felt (ACF) was applied as a conductive substrate. Fluorescence characterization was then used to further highlight its redox properties and the tunability of its surface charge. The activated PVF-based electro-responsive adsorptive membrane (PERAM) showed an excellent adsorption capacity and selectivity for Cr(VI) during single-pass filtration. Notably, regeneration was achieved by the application of a reversed electric potential without the need for additional chemical additives. The Cr(VI) effluent concentration was reduced to <0.05 mg/L at a high flux of 424 L/m 2 ·h, and it had a treatment capacity of greater than 5140 L/m 2 due to effective activation and regeneration. The electrostatic force changes between the PVF and Cr(VI) at different potentials was the key mechanism that allowed for the rapidly reversible adsorption-desorption of Cr(VI) according to the results of the density functional theory (DFT) calculations and molecular dynamics (MD) simulations.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Zhenhua Xin,Renjie Chen,Chuanjin Lin,Bin Dong,Zuxin Xu
The aggregation and separation of magnetic biochar (MBC) are the bottlenecks in its application for the removal of hexavalent chromium (Cr(VI)) from aquatic media. To solve this problem, MBC and Fe(II)–sodium alginate (SA) hydrogel were combined to form SA–Fe(II)–MBC beads (SA–Fe–C), which were used for Cr(VI) removal and immobilization from aqueous solutions. SEM and XPS revealed that the 3D network structure of SA–Fe(II) hydrogel effectively prevented the aggregation of MBC. The experimental maximum Cr(VI) removal capacity of SA–Fe–C beads was 30.03 mg/g at pH 4. The spontaneous process of Cr(VI) removal by SA–Fe–C beads was best described by a pseudo-second-order model and dominated by chemical adsorption. Toxicity characteristic leaching procedure extraction showed that SA–Fe–C beads exhibited excellent immobilization capacity for Cr. The mechanism whereby SA–Fe–C beads removed and immobilized Cr(VI) from solution was found to involve: (1) adsorption, (2) reduction of Cr(VI) to trivalent chromium (Cr(III)) by Fe(II) and hydroxyl groups, and (3) co-precipitation of Cr(III) with Fe(II) to form chromite. In addition, the beads demonstrated excellent regeneration capability and reusability, showing promising potential for heavy metal removal from contaminated water.
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Water
·
2025
·Vol. 17
·期 19
·2910
·
IF 3
Xinchi Zong,Tianliang Duan,Linyan Chen,Zhengwei Luo,Hui Jiang,Wenhua Geng
The escalating issue of water pollution driven by rapid industrialization necessitates the development of advanced remediation technologies. In this study, a novel method for producing chromium (Cr(VI)) ion-imprinted biochar (Cr(VI)-IIP-PEI@NBC) from wheat residue was proposed. After acid-oxidative modifications, polyethyleneimine (PEI) and glutaraldehyde (GA) were employed as the functional monomer and crosslinker, respectively, to enhance the biochar’s selectivity and adsorption capacity. Under optimized conditions (pH 2.0, 55 °C), the adsorbent achieved a maximum Cr(VI) uptake of 212.63 mg/g, which was 2.3 times higher than that of the non-imprinted biochar. The material exhibited exceptional specificity (99.64%) for Cr(VI) and maintained >80% adsorption efficiency after five regeneration cycles, demonstrating excellent reusability. Comprehensive structural characterization via Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), Brunner–Emmet–Teller measurements (BET), and Scanning Electron Microscopy (SEM) confirmed successful Cr(VI) imprinting in the biochar and its high thermal stability and mesoporous architecture, elucidating the mechanisms behind its superior performance. This study presents a sustainable and high-performance adsorbent for the efficient treatment of chromium-contaminated wastewater, with significant potential for industrial applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Yihan Li,Xuezhu Zhang,Xiaoxiao Wang,Fushuo Shen,Yan Zhang,Changxin Du,Peng Shun,Likai Wang,Xiaobin Wang,Qiang Liu,Qinze Liu
Hexavalent chromium (Cr(VI)) is a highly toxic pollutant with substantial risks to ecosystems, rendering its efficient removal from waters a critical challenge. This study fabricated a novel poly(pyrogallol-tetraethylenepentamine)/carbonizing corncob (PPTA/CC) composite for Cr(VI) decontamination by decorating mussel-inspired resin onto carbonized corncob (CC) via a facile modification strategy. The PPTA/CC hybrid synergistically integrated the hierarchical porosity of the CC support with the abundant phenolic hydroxyl and amino functional groups of PPTA polymer layer, thereby facilitating rapid adsorption-reduction of Cr(VI). The theoretical maximum adsorption capacity was determined to be 787 mg g −1 , with the process being spontaneous (as indicated by negative ΔG°) and endothermic, well-described by the Langmuir isotherm and pseudo-second-order kinetic models. PPTA/CC candidate also exhibited outstanding selectivity and stability toward Cr(VI) in the presence of common coexisting ions. These results highlight PPTA/CC as a promising composite material for the efficient remediation of Cr(VI) in wastewater treatment applications.
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