Environmental Science-Nano
·
2025
·
IF 5.1
Yanchun Liao,Wenhao Lao,Chenyi He,Junchun Li,Longyong Lin,Yiping Feng,Yirong Deng
Ferrihydrite (Fh), a metastable iron(oxyhydr)oxide abundant in soils and sediments, plays a pivotal role in regulating phosphorus bioavailability and contaminant Cr(VI) fate, but its rapid phase transformation to low-reactivity crystalline phases limits its long-term functionality. This study investigated how light (Nd3+) and heavy (Y3+) rare earth elements (REEs) modulate Fh's phase transformation and Cr(VI)/PO43− sequestration. The results showed that LREE Nd3+ predominantly adsorbed onto Fh surfaces, forming a protective layer that shielded reactive Fe–OH sites and delayed hydroxyl displacement. In contrast, HREE Y3+ underwent isomorphic substitution into Fh's octahedral Fe–O framework, inducing lattice distortion and suppressing acicular goethite crystallization by ca. 26%. Both REEs preserved Fh's metastability, and maintained Fe in the oxidized Fe3+ state. In addition, both Nd3+ and Y3+ integration into hematite during transformation slowed Fh conversion to low-adsorptivity crystalline phases. Consequently, after 30 days of aging, REE-doped Fh exhibited significantly enhanced Cr(VI)/PO43− sequestration (qmax,Cr(VI) = 19.39 mg g−1 and qmax,P = 43.33 mg g−1 for Fh–Nd, 24.47 and 64.03 mg g−1 for Fh–Y) compared to pristine Fh (qmax,Cr(VI) = 4.91 and qmax,P = 24.03 mg g−1). These enhancements might be driven by prolonged amorphous Fh persistence, REE–Cr(VI)/PO4 surface precipitation, and REE–O–Fe ternary binding sites. These findings clarify how REE–Fe coupling regulates Cr(VI)/PO43− fates in terrestrial ecosystems and also provide insights for designing REE-modified adsorbents for long-term contaminant/nutrient retention in soils or aquatic systems, where Fh's natural transformation would otherwise compromise such efficacy.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Biao Yuan,Pan Wu,Changjun Liu,Jian He,Wei Jiang
The challenge of separating and recovering V(V) and Cr(VI) from wastewater is critical for environmental protection and industrial productivity due to the chemical similarities. In this study, a novel zirconium-based adsorbent with superior adsorption performance and selectivity was synthesized using the Sol-Gel method, with a specific surface area of up to 265.3 m 2 /g. The maximum adsorption capacities of V(V) and Cr(VI) were 222 and 123 mg/g, respectively. The adsorption process followed the Langmuir isothermal adsorption and the pseudo-second-order kinetic model. The adsorption mechanism was thoroughly investigated confirming that the adsorption of V(V) and Cr(VI) on amorphous hydrous ZrO 2 (AHZOs) is chemisorption. At a pH of 3, the values of ΔG 0 (−46.8 kJ/mol) and E ads (−5.67 eV) for the main existing form H 3 V 10 O 28 3- on AHZOs are lower than those for the main existing form HCrO 4 - . V(V) replaced the adsorbed Cr(VI) during competitive adsorption to achieve selective adsorption of V(V) with a separation coefficient as high as 3142. The adsorption capacity of V(V) remains above 105 mg/g after five cycles. After adsorption, the purity of Cr(VI) can be increased to above 99.5 %, and a solution of V(V) with a purity higher than 99.25 % can be obtained after desorption. The use of 3 g/L and 100 g/L adsorbent can decrease the single V(V) and Cr(VI) to 1.618 mg/L and 0.36 mg/L, respectively, and meet the emission standards.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hanqing Yu,Shijiao Li,Zheng Zeng,Guangxu Yang,Xu Tang,Yujia Zhang,Yi Dai,Lingyun Zhou,Xin Tong,Yadian Xie
The contamination of water with hexavalent chromium (Cr(VI)) poses a significant environmental and health threat. Basalt fiber (BF) is a high-strength, high-temperature-resistant, corrosion-resistant, and eco-friendly inorganic fiber material that shows promise for addressing such contamination. However, a key challenge lies in how to effectively modify its surface functionality and enhance the overall performance of fiber composites to improve adsorption efficiency, especially in large-scale applications. In this study, we present a scalable fabrication method for graphene-basal composite material using a layer-by-layer deposition technique. This process enables the mass production of highly efficient Cr(VI) adsorbents. It exhibited a Cr(VI) removal rate of up to 97.9 % within 2 h, making it a promising candidate for efficient Cr(VI) adsorption. The composite material, integrating the high surface area of graphene with the mechanical strength and chemical stability of basalt, exhibits superior adsorption capacity and reusability in removing Cr(VI) from contaminated water. Density functional theory (DFT) calculations indicated that the synergistic interaction between GO and BF enhanced both the physical and chemical adsorption of Cr(VI), facilitating its removal. Batch experiments demonstrate that the composite achieves rapid and efficient Cr(VI) removal across a wide range of pH levels and initial concentrations. The simple and scalable fabrication process highlights the potential for practical applications in large-scale water treatment. Furthermore, this study provides insight into the mechanisms underlying the adsorption process, offering a sustainable, rapid, and cost-effective solution to heavy metal pollution in environmental water bodies.
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Surfaces and Interfaces
·
2024
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IF 5.7
Fen Zhang,Shuyu He,Luyao Xi,Liying Ma,Liwen Zhang,Ling Xiong,Shaohua Chen,Benjun Xi
Reduction of Cr(VI) to Cr(III) or elimination of Cr(VI) from aqueous environments is the most commonly used method to address Cr(VI) contamination. Waste molasses (WM) is a by-product from the sugar industry, if discharged arbitrarily without treatment can lead to waste of resources and cause serious environmental pollution . In this study, the modification of polypyrrole (PPy) with WM (PPy/WM) not only provided PPy with good dispersibility and higher specific surface area, but it can also enrich the functional groups on the surface of PPy. The findings indicated that PPy/WM composites can serve as superior adsorbent materials for highly efficient and selective removal of Cr(VI) when different interfering ions are present. e.g., 150 mg/L of Cr(VI) can be eliminated completely within 6 h under the condition of PPy/WM amount of 0.8 g/L, temperature of 303 K, and pH of 2.0. PPy/WM showed excellent performance for removal of Cr(VI) in a wide pH range (2.0 - 10.0). PPy/WM exhibited excellent reusability for five cycles without obvious loss of its adsorption capacity. The maximum Cr(VI) adsorption capacity of PPy/WM was 662.25 mg/g at 323 K, evidently higher than that of unmodified PPy (194.17 mg/g). Cr(VI) removal by PPy/WM was chiefly accomplished by electrostatic adsorption, ion exchange and in-site reduction. This study not only provides a new technology for efficient adsorption and in-situ reduction of Cr(VI), but also realizes the resource utilization of WM and solves the WM pollution problems.
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Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Ming Zhang,Qingkai Shi,Jing Tong,Min Cheng,Hao Ge,Sai Li,Guangfu Wang,Li Du,Hongda Liu,Ao Chen,Zhongwu Li
Based on Cr(VI) reduction, organic pollutants oxidative degradation and the excellent properties of carbon materials, the effectiveness of carbon materials for enhanced simultaneous Cr(VI) reduction and organic pollutants removal was verified. In this work, reduced graphene oxide (rGO) showed high catalytic activity, achieving > 99 % removal of both 10 mg/L 4-methoxyphenol (MOP) and 0.075 mM Cr(VI) within 20 min (k obs of 0.1723 min −1 and 0.1688 min −1 , respectively). To analyze the structure-activity relationship of the carbon materials in the system, a series of rGO derivatives were prepared. The results showed that the redox efficiencies of MOP and Cr(VI) had a significant positive correlation with the defect level of rGO, while the oxygen content was a negative factor for the catalytic performance, demonstrating that the defects were the main sites mediating the redox of MOP and Cr(VI). Furthermore, the O 2 • − , 1 O 2 and electron transfer pathway were identified as the mechanisms of MOP degradation and Cr(VI) reduction, according to quenching, electron spin resonance, salt-bridging and electrochemical oxidation experiments. Ultimately, the stability, broad applicability of simultaneous redox of MOP and Cr(VI) mediated by rGO were confirmed by cycling experiments, degradation experiments in various waters and with different pollutants. This study provides new mechanistic insights for the synergistic treatment of composite pollution using carbon materials.
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Separations
·
2025
·Vol. 12
·期 9
·247
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IF 2.7
Na Huang,Shengwen Chen,Wanhe Du
The photocatalytic reduction of hexavalent chromium (Cr(VI)) in wastewater represents a critical environmental challenge, given its high toxicity and mobility in wastewater. Conventional optimization methods relying on repetitive batch experiments with excessive reagent consumption. Herein, we proposed a synergistic experimental–deep learning approach to realize efficient photocatalytic reduction of Cr(VI). Sludge and cellulose precursors were used to prepare N-doped porous carbon through a green fabrication method at low temperature. After optimizing the composition and experimental factors, the removal efficiency of Cr(VI) could reach 92.7% after visible light irradiation in an acidic environment. The high efficiency originated from the coupled adsorption and photocatalytic mechanism. Innovatively, after comparing three algorithms, TCN and Transformer were employed to predict the desirable removal efficiency with <5% prediction error under different reaction conditions. This work highlights the novel experimental–deep learning method for heavy metal remediation using N-doped waste-derived porous carbon.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2026
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IF 4.4
Guanghui Chen,Bolin Li,Zhiguang Xue,Hong Liu,Jiayao Chen,Lei Zhang,Xinguo Xi,Lanqin Tang,Yong Zhou
Constructing well-defined MOF/COF heterostructures that integrate pollutant enrichment with efficient interfacial charge separation remains challenging, as intimate interfacial contact may compromise framework integrity. Herein, an ultrathin TPA-COF/UiO-66-NH₂ heterostructure is fabricated via interfacial self-assembly of exfoliated TPA-COF nanosheets, forming a conformal COF coating while preserving the crystallinity and microporosity of UiO-66-NH₂. Microscopic, thermogravimetric, and nitrogen sorption analyses reveal a continuous ultrathin COF layer with a low yet quantifiable loading (~1.5 wt%) and a BET surface area comparable to that of the pristine MOF. Compared with the individual components and their physical mixture, the assembled heterostructure exhibits markedly enhanced photocatalytic Cr(VI) reduction, highlighting the importance of controlled interfacial integration. Comparative adsorption studies, kinetic modeling, and pH-dependent experiments indicate that Cr(VI) enrichment is closely associated with surface-charge-mediated interactions of the amine-functionalized framework. Suppressed photoluminescence, enhanced photocurrent response, and radical scavenging experiments are consistent with improved interfacial charge separation, with photogenerated electrons serving as the dominant reductive species. Band-edge analysis further suggests a staggered energy alignment that is energetically favorable for interfacial carrier transfer. These findings illustrate how combining functional-group-mediated enrichment with controlled interfacial assembly can cooperatively influence adsorption and charge-transfer processes in MOF/COF heterostructures.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2026
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IF 10.6
Haoran Hu,Guoyan Dang,Jiahe Shi,Junhao Cui,Shu Zhou,Yanrong Zhang
The reaction between hexavalent chromium (Cr(VI)) and sulfite (S(IV)) holds promise for water decontamination but intrinsically favors a non-radical pathway, leading to toxic Cr(V) accumulation and inefficient radical yields. Herein, we constructed a heterogeneous carbon/Cr(VI)/S(IV) advanced oxidation system using carboxyl-rich carbon materials (CP-T and MWCNTs-COOH) to steer the reaction toward a radical-dominated pathway. Combined experimental and theoretical analyses unravel a surface-mediated ligand-exchange activation mechanism. Surface carboxyl groups function as specific anchoring sites, undergoing ligand exchange with Cr(VI) species to form a reactive Carbon-COO-Cr(VI) intermediate. Concurrently, the highly conductive carbon framework serves as an efficient electron conduit, facilitating rapid interfacial electron transfer from S(IV) to the anchored Cr centers. A dual-descriptor kinetic model was established, quantitatively demonstrating that the catalytic turnover is governed by a symmetric co-limitation regime; the intrinsic catalytic activity of the carboxyl sites is non-linearly amplified by the enhanced electron transport capability of the carbon network. This synergistic interplay simultaneously achieves complete Cr(VI)-to-Cr(III) detoxification and efficient sulfate radical (SO 4 •− ) generation. Furthermore, density functional theory (DFT) calculations elucidated the SO 4 •− -initiated degradation pathways for diclofenac (DCF). Operating efficiently in authentic water matrices under near-neutral conditions, this work provides a scalable and sustainable strategy for the synergistic remediation of complex metal-organic co-contamination.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Ziming Xin,Chendao Ruan,Jing Wang,Yuejin Zhang,Jiyan Shi
Fe/Mg co-modified biochar enabled simultaneous PFAS adsorption and Cr(VI) reduction–immobilization. • Acid-washed Fe₄Mg₁-NBC showed enhanced removal, pore accessibility, and regenerability. • Experiments and DFT confirmed hierarchical pores, bimetallic sites, and interfacial synergy as key mechanisms. Simultaneous removal of per - and polyfluoroalkyl substances (PFAS) and hexavalent chromium (Cr(VI)) from water remains challenging because of their divergent adsorption, redox, and interfacial behaviors. Herein, Fe/Mg co-modified N-doped biochar (Fe₄Mg₁-NBC) was fabricated through a hydrothermal synthesis strategy followed by pyrolysis and acid washing for the synergistic remediation of PFAS/Cr(VI) co-contaminated water. The optimized Fe/Mg ratio regulated the pore architecture and surface chemistry, producing a hierarchically porous, partially graphitized carbon matrix enriched with oxygen-containing groups and highly dispersed Fe–O/Mg–O active sites. Fe₄Mg₁-NBC exhibited superior removal performance toward PFOA, PFOS, PFBA, PFBS, and Cr(VI) in both single-solute and binary systems, with favorable adsorption under weakly acidic conditions and moderate temperatures. Acid washing further improved performance by eliminating inactive residues, opening blocked pores, and exposing additional active sites, while more than 90% of the initial adsorption efficiency was retained after five regeneration cycles. XPS analysis revealed Fe 2+ /Fe 3+ transformation and Metal–F interactions, indicating that Cr(VI) removal proceeded through Fe-mediated reduction followed by Cr(III) immobilization, whereas PFAS uptake involved electrostatic attraction, coordination, hydrophobic interaction, and pore filling. DFT calculations further demonstrated that Fe/Mg co-doping markedly enhanced PFAS adsorption affinity, decreasing the adsorption energy from +0.43 eV on pristine biochar to −1.24 eV on Fe/Mg-NBC. Co-adsorption configurations also suggested that Fe and Mg sites provided complementary functions for Cr(VI) activation and PFAS stabilization in mixed systems. These findings establish Fe₄Mg₁-NBC as a reusable multifunctional adsorbent for efficient treatment of PFAS/Cr(VI)-contaminated water. Download: Download high-res image (167KB) Download: Download full-size image
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2026
·
IF 4.4
Bingkun Liu,Juncheng Guo,Ziyang Liang,Yuhan Yang,Beibei Liu,Bing Han,Yonghui Zhang
NH 2 -MIL-101(Fe)/few-layer Ti 3 C 2 Schottky heterojunctions are constructed. • NH 2 -MIL-101(Fe)/Ti 3 C 2 composite shows higher photocatalytic activity for Cr(VI) removal. • The Schottky heterojunctions boost the separation of photogenerated charges. • The photogenerated electrons and •O 2 − dominate the Cr(VI) reduction process. The limited charge transfer efficiency of single-component semiconductor photocatalysts remains a critical bottleneck restricting the photocatalytic elimination of harmful pollutants. Here, NH 2 -MIL-101(Fe) nanoparticles are anchored onto few-layer Ti 3 C 2 nanosheets via electrostatic self-assembly to construct NH₂-MIL-101(Fe)/Ti 3 C 2 heterostructure. The few-layered 2D Ti 3 C 2 supplies abundant adsorption and catalytic active sites. Furthermore, benefiting from the Schottky junction and the superior conductive feature of Ti 3 C 2 MXene, the separation and transport of photoinduced carriers are remarkably promoted in the NH 2 -MIL-101(Fe)/Ti 3 C 2 . Accordingly, the optimized NH 2 -MIL-101(Fe)/Ti 3 C 2 –10% sample can remove 95.7% of Cr(VI) after 150 min of visible-light irradiation and still exhibits favorable reusability after three cycles. The electrons and •O 2 − are confirmed as the primary active species driving Cr(VI) reduction. Combined with comprehensive characterizations, a plausible photocatalytic mechanism of Cr(VI) reduction is put forward. This work offers fundamental guidance for developing MXene-based Schottky heterostructures toward improved photocatalytic activity.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Umer Hayat,Shafuq Abbas,Qingcai Yu,Yifan Chai,Defeng Kong,Xinyang Huang,Xing Chen
Nowadays, heavy metals are a major issue worldwide, polluting natural resources. In the given study, a novel approach was developed; commercial coconut shell activated carbon was modified with Fe 3 O 4 and thiourea (CH 4 N 2 S) to adsorb Cr(VI) and Ni(II) from industrial wastewater under photochemical reaction on a signal platform. The Cr(VI) reduction-adsorption rate was approximately 95% (2.91 mg/L), which was investigated under acidic conditions (pH = 2) with a 40 mg dose of adsorbent. The same phenomenon was observed for Ni(II) adsorption, approximately 91% (3.98 mg/L) at pH = 6 for 60 min, using the same adsorbent dose. The increased removal efficiency is attributed to the synergetic behavior of Fe₃O₄ and thiourea, where the Fe₃O₄ endorsed the reduction-adsorption of Cr(VI) while thiourea functional groups ( NH₂ and C S) endorsed the adsorption of Ni(II) with strong coordination of active sites along with surface complexation and electrostatic interactions. Analysis indicated the breakage of the activated carbon structure after the Cr(VI) adsorption. To get insights into the adsorption mechanism, Density Functional Theory calculations were performed to optimize structure, showing the stability of metal and surface complexes. FMO analysis demonstrates a reduction in the HOMO-LUMO energy gap from 2.95 eV (CSAC) to 0.17 eV (CSAC@Fe₃O₄@TU & metal), indicating increased surface reactivity and charge transfer. While NCI and RDG calculations further confirm the electrostatic attraction and bonding of Cr(VI) and Ni(II). This study presents a novel approach to conducting comparative studies under photochemical reactions. The CSAC@Fe 3 O 4 @Tu is a low-cost, green catalyst that was used for the remediation of environmental pollutants.
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Science China-Technological Sciences
·
2025
·Vol. 68
·期 11
·1-10
·
IF 4.9
Guo Jia,Xu Jiaqi,Zhang Xiangwei,Li Zhengmao,Liu Fuyang,He Lei,Long Mingce,Tong Meiping
The rapid aggregation and sedimentation, the high toxicity towards bacteria, and the passivation of surfaces hinder the application of zero-valent iron (ZVI) particles in groundwater remediation. To overcome the shortages, ZVI particles were modified using oxalic acid (an environmental-friendly low-molecular-weight organic acid) together with xanthan gum (a safe and cost-effective high-molecular-weight polymer). We found that ZVI modified with both oxalic acid and xanthan gum exhibited superior Cr(VI) removal performance than those modified solely with oxalic acid and unmodified ZVI. Due to the reduced Fe 2+ release, the toxicity towards Escherichia coli by oxalic acid-xanthan gum modified ZVI was greatly inhibited. Via enhancing electrostatic repulsion through increasing the negative zeta potentials, modification of ZVI by oxalic acid and xanthan gum improved the dispersion of ZVI and reduced their sedimentation in suspension. Moreover, the mobile performance of ZVI in porous media was greatly improved by the modification with oxalic acid and xanthan gum due to the enhanced electrostatic repulsive interaction between ZVI and quartz sand. The observations held true in actual groundwater samples without and with heavy metal contamination. Clearly, the modification of ZVI by using oxalic acid and xanthan gum could be a feasible approach to enhance the practical application potential for the in-situ decontamination of groundwater.
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