ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Wenhao Wang,Xingyu Wang,Xuechen Wu,Jinhua Zhang,Hejie Qin,Jinxiang Li
Nanoscale zerovalent iron (nZVI) has been extensively applied in water pollution control. However, the reactivity of nZVI toward contaminants is mainly limited by its corrosion and agglomeration. In this study, the nZVI modified by sulfidation coupled with carboxymethyl cellulose (CMC) (C-S-nZVI) was synthesized and characterized by TEM and electrochemical techniques. Taking Cr(VI) as the contaminant, it was found that the sulfidation could couple with CMC modification to not only enhance the reactivity of nZVI toward Cr(VI), but also regulate the sedimentation activity and corrosion activity of nZVI in water. Particularly, the optimal k obs (0.0816 min −1 ) obtained by the C-S-nZVI one -0.16 (i.e., one-step sulfidation and its S/Fe molar ratio was 0.16) was approximately 27.2 times higher than that by the nZVI (0.0030 min −1 ). Moreover, based on the correlation analysis of the ternary activities, this study confirmed that the reactivity of C-S-nZVI toward Cr(VI) was negatively correlated with its sedimentation activity (slope = −0.7623, R = 0.59) and corrosion activity (slope = −0.0171, R = 0.56), respectively. XPS and TEM results further revealed that CMC could couple with iron sulfides (FeS x ) to enhance the mass transfer of Cr(VI) toward nZVI and subsequent electron transfer from Fe 0 core to out, ultimately improving the reduction of Cr(VI) by nZVI. Overall, this study introduced a new evaluation method based on the ternary activity of nZVI, providing theoretical support for the practical application of nZVI-based technology.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wenhao Wang,Pei Gao,Chun Yang,Zhiwei Zhao,Shucong Zhen,Youxin Zhou,Tingting Zhang
Destruction of the dense oxide layer on the surface of pristine or re-passivated micro zero-valent aluminum (mZVAl) can rejuvenated its reduction activity, which is beneficial to the removal of aqueous pollutants. To rejuvenated the reduction activity of mZVAl and rapidly recovery passivated mZVAl, in this study, a novel mZVAl/nFe 3 O 4 composite with high activity and magnetic properties was synthesized by ball milling (BM). Compared with pristine mZVAl and nFe 3 O 4 , more than 95% of Cr(VI) could be removed in 30 min at 3.0 g/L mZVAl/nFe 3 O 4 dosage over a wide range of pH (3.00–11.00). The removal of Cr(VI) conformed to the pseudo-first-order adsorption kinetic model, and the equilibrium adsorption data was in accordance with the Langmuir adsorption isotherm model. The maximum absorption (8.14 mg/g) was related to the BM parameters (the weight ratio of mZVAl/nFe 3 O 4 , BM speed and BM time). Accord to the effect of co-existing ions on the removal efficiency of Cr(VI), it was proved that the significance of the adsorption process was a prerequisite step for Cr(VI) reduction. Based on X-ray photoelectron spectroscopy (XPS) and the valence analysis of aqueous Cr, the Cr(VI) removal mechanism by mZVAl/nFe 3 O 4 was also unraveled, in addition to achieving Cr(VI) reduction, also achieves the sequestration of total Cr under neutral environment. Furthermore, the reusability of mZVAl/nFe 3 O 4 was limited by the accumulation of (hydr)oxide on its surface, but can be easily rejuvenated by BM again with a small amount of nFe 3 O 4 . In conclusion, mZVAl/nFe 3 O 4 composite are a promising green material to reductive remove Cr(VI) from near-neutral wastewater.
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Hualin Jiang,Menglin Li,Jun Liu,Xueqin Li,Lei Tian,Pinghua Chen
In this study, a novel CeO 2 -TiO 2 nanocomposite denoted as CeO 2 -3TiO 2 was successfully synthesized via a facile one pot hydro-thermal method without alkali. It exhibits high photocatalytic reduction reactivity toward Cr(VI) under visible light. The photocatalytic reactivity of CeO 2 -3TiO 2 is 18 times higher than that of pure CeO 2 , 28 times higher than pure TiO 2 , 15 times higher than the sample of simply mixed CeO 2 and TiO 2 . The solution with Cr(VI) initial concentration of 2780 ppb can be fast photoreduced by CeO 2 -3TiO 2 in 60 min under visible light to meet the criterion of U.S. Environmental protection Agency. Characterization results indicate CeO 2 -3TiO 2 has the good crystal form of heterojunction structure, narrow pore size distribution , narrow energy gap and high photogenerated electron-hole separation efficiency. Based on the experimental results, a speculated photocatalytic mechanism was proposed.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 51
·77344-77358
·
IF 5.19
Ding Baoting,Wang Xiaomeng,Feng Kun,Fu Jingran,Liang Jianru,Zhou Lixiang
Acidic Cr(VI)-containing wastewater has received increasing attention in recent years. Schwertmannite is a suitable adsorbent for its acid resistance and good adsorption ability. However, it shows poor Cr(VI) adsorption performance under acidic conditions. Herein, inspired by the fast neutralization-mineralization process of acid mine drainage (AMD) triggered by alkaline rocks, a novel nano-scaled schwertmannite (Sch-2.7) with high Cr(VI) adsorption capacity was synthesized at constant pH of 2.7 via adding OH − . Compared with common schwertmannite (Sch), appropriate OH − effectively improved mineral yield (the precipitation efficiency of Fe: 96.75% vs. 29.93%), specific surface area (65.1 m 2 /g vs. 18.9 m 2 /g), surface group content, and further Cr(VI) adsorption ability of Sch-2.7. The maximum adsorption capacity was 54.17 (pH = 3), 61.59 (pH = 4), and 66.5 mg/g (pH = 5) for Sch-2.7, whereas only 20.35, 24.51, and 27.17 mg/g for Sch. On average, the former was 2.53 times higher than the latter. Temperature and coexisting ions had little influences on the sorption process of Sch-2.7. The mechanism analysis demonstrated that the Cr(VI) removal by Sch-2.7 was a more thermodynamic favorable process due to abundant reactive-active components on Sch-2.7 for adsorption reaction. This work provided new insight into performance optimization and application potential on Cr(VI) removal of schwertmannite.
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高影响因子
Frontiers of Environmental Science & Engineering
·
2020
·Vol. 15
·期 4
·1-13
·
IF 4.053
Mao Wei,Zhang Lixun,Wang Tianye,Bai Yichen,Guan Yuntao
A visible-light-driven Bi 2 WO 6 /CuS p-n heterojunction was fabricated using an easy solvothermal method. The Bi 2 WO 6 /CuS exhibited high photocatalytic activity in a mixed system containing rhodamine B (RhB), tetracycline hydrochloride (TCH), and Cr (VI) under natural conditions. Approximately 98.8% of the RhB (10 mg/L), 87.6% of the TCH (10 mg/L) and 95.1% of the Cr(VI) (15 mg/L) were simultaneously removed from a mixed solution within 105 min. The removal efficiencies of TCH and Cr(VI) increased by 12.9% and 20.4%, respectively, in the mixed solution, compared with the single solutions. This is mainly ascribed to the simultaneous consumption electrons and holes, which increases the amount of excited electrons/holes and enhances the separation efficiency of photogenerated electrons and holes. Bi 2 WO 6 /CuS can be applied over a wide pH range (2–6) with strong photocatalytic activity for RhB, TCH and Cr(VI). Coexisiting dissolved organic matter in the solution significantly promoted the removal of TCH (from 74.7% to 87.2%) and Cr(VI) (from 75.7% to 99.9%) because it accelerated the separation of electrons and holes by consuming holes as an electron acceptor. Removal mechanisms of RhB, TCH, and Cr(VI) were proposed, Bi 2 WO 6 /CuS was formed into a p-n heterojunction to efficiently separate and transfer photoelectrons and holes so as to drive photocatalytic reactions. Specifically, when reducing pollutants (e.g., TCH) and oxidizing pollutants (e.g., Cr(VI)) coexist in wastewater, the p-n heterojunction in Bi 2 WO 6 /CuS acts as a “bridge” to shorten the electron transport and thus simultaneously increase the removal efficiencies of both types of pollutants.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Jiahao Li,Rong Cheng,Jiaao Chen,Jirong Lan,Shiyao Li,Min Zhou,Tianyu Zeng,Haobo Hou
A series of nitrogen-doped carbon aerogels (NCAs) were obtained through phase reaction polymerization and different carbonization temperatures to enhance adsorption efficacy of hexavalent chromium (Cr[VI]) from wastewater significantly. Factors that influence adsorption properties of carbon aerogel microspheres toward Cr(VI), such as pH, adsorbent content, initial Cr(VI) concentrations, and coexisting anion, were investigated. Three isotherm (Langmuir, Freundlich, and Sips) and three kinetic (pseudofirst-order, pseudosecond-order, and Elovich) models were used to interpret the adsorption process. The adsorption capacity of Cr(VI) reached 180.62 mg·g −1 , which was superior to that of most aerogel adsorbents. In addition to the adsorption effect, the XPS results also showed that N-containing groups on the NCA surface reduce the adsorbed Cr(VI) to the less toxic Cr(III). The prepared sorbent demonstrates a negligible loss in adsorption capacity after 6 cycles. NCAs show acceptable application prospects in selective removal of Cr(VI) ions.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xiong Tao,Fengxi Chen,Jun Li,Yunling Liu,Xiaowu Hu,Rong Chen
Emerging Bi 2 S 3 -based nanotechnology has great potential in Cr(VI)-contaminated wastewater treatment . In this work, it was found for the first time that Bi 2 S 3 nanoparticles (BS-D) prepared from dual sulfur sources of L-cysteine and ammonium sulfide efficiently promoted Cr(VI) removal with excellent selectivity for simultaneous removal of Cr(VI) and Cu 2+ from aqueous solutions containing various co-existing ions (including Na + , K + , Ca 2+ , Zn 2+ , Ni 2+ , Cd 2+ , NO 3 – , SO 4 2− and Cl − ) at pH > 3, preferably at pH of 4.5. Besides, BS-D had stable performance for co-removal of Cr(VI) and Cu 2+ in five recycling tests. Kinetic and thermodynamic studies indicated that the adsorption of Cr(VI) or Cu 2+ by BS-D was a spontaneous endothermic process and conformed to pseudo-second-order kinetic model. The adsorbed Cr(VI) ions were partially reduced to Cr(III), which were leached into the solution at pH ≤ 3, inhibiting the adsorption of Cu 2+ on BS-D and its promotional effect on Cr(VI) removal by BS-D. The mutual promotional effects between Cu 2+ and Cr(VI) during their co-removal by BS-D were ascribed to electrostatic attraction between HCrO 4 − and Cu 2+ and smaller pH variation in mixed Cr(VI)-Cu 2+ solutions. Finally, potential applications of BS-D were demonstrated by co-removal of Cr(VI) and Cu 2+ from real electroplating wastewater and contaminated groundwater. This work provided a promising BS-D adsorbent for Cr(VI)-contaminated wastewater treatment, and shed insight on the influence of Cu 2+ on the Cr(VI) removal by BS-D.
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高影响因子
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yali Song,Cairong Yang,Xiaoyu Wen,Xiaojing Zhang,Yongpeng Ma,Mengke Shi,Hongzhong Zhang
Flower–shaped ZnIn 2 S 4 made by the traditional solvothermal method has a high rate of e – –h + recombination, limiting the photocatalytic reactions and its application. To address this issue, potassium sodium tartrate was added during solvothermal synthesis process to prepare ZnIn 2 S 4 photocatalysts with excellent photocatalytic performance. When the added dosage of potassium sodium tartrate was 0.4 g, the obtained ZnIn 2 S 4 photocatalysts (ZIS–0.4) showed a sheet–like structure and exposed more active (110) facet. Multiple characterization methods indicated that ZIS–0.4 exhibited the highest separation efficiency of photogenerated e – –h + pairs and electron migration. As a result, ZIS–0.4 showed the most superior photocatalytic efficiency in reducing Cr(VI). Following 20 minutes of exposure to visible light, ZIS–0.4 achieved a reduction rate of 99.3 % for Cr (VI), while the reduction efficiency of flower–shaped ZnIn 2 S 4 prepared without potassium sodium tartrate (ZIS–0) was only 28.5 %. The pseudo–first order kinetic reaction rate constant of ZIS–0.4 (0.244 min –1 ) was 15.25 times higher than ZIS–0 (0.016 min –1 ). Electron paramagnetic resonance and radical trapping experiments have verified that the main reactive substances were e – and ·O 2 – in Cr(VI) reduction process.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Qianwei Liang,Hanjin Luo,Junjie Geng,Jingda Chen
A novel nitrogen-doped ultra-light graphene oxide (GO) aerogel with three-dimensional (3D) network structure is used for removing of Cr(VI) from aqueous solution, which is fabricated by a facile one step hydrothermal self-assembly process and an environmentally friendly freeze-drying technique. GO and organic amine are used as the precursors to synthesize the aerogels, in which pyrrole and Tetraethylenetetramine (TEPA) are introduced as nitrogen sources to obtain the amino functional groups, meanwhile, they also play the roles as cross-linking agents to control the assembly of GO sheets in the 3D structure. The obtained TEPA/polypyrrole/GO aerogel (TPGA) has a high adsorption capacity for Cr(VI) anions (up to 408.48 mg/g) at an optimal pH of 2.0. The kinetics process of Cr(VI) adsorption on TPGA can be fitted well with the pseudo-second-order kinetic model. The mechanism of adsorption is analyzed by intraparticle diffusion and external film diffusion models, which indicates that the overall rate of Cr(VI) adsorption process is influenced by multi-steps. The isotherm and thermodynamic studies confirms that adsorption of Cr(VI) on TPGA is a spontaneous and endothermic process in the monolayer adsorption pattern. Furthermore, the prepared TPGA exhibits a good regeneration ability and satisfactory recovery for Cr(VI) anions in practical water samples. This work provides a simple and environmentally friendly method to synthesize the nitrogen-doped GO aerogel, which show a great potential and promise for practical application in the field of waste water treatment.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Chengcheng Shen,Li Gu,Sihao Chen,Yajuan Jiang,Peng Huang,Heng Li,Huayang Yu,Dong Xia
Effective utilization and resourcelization of sewage sludge into value-added by-products and insights into its environmental impacts during the fabrication process are urgent tasks to be tackled. Here, we adopt FeCl 3 to activate and functionalize sewage sludge to form FeCl 3 -activated biochars, which exhibited high adsorption capabilities for the treatment of toxic As(III) and Cr(VI) containing wastewaters. Kinetic studies suggested that the adsorption of As(III) and Cr(VI) species onto the biochar surface was attributed to physisorption and chemosorption, respectively. Equilibrium was reached after 3 h for the adsorption of Cr(VI), and slightly slower for that of As(III). Additionally, the structural stability of the adsorbent was maintained even in wastewater with high acidity (pH = 1), as corroborated by microscopic observations. Structural characterization of the adsorbents after adsorption showed that the excellent adsorption performance originated from adsorptive functionalities of the surface functional groups and the active Fe 3 O 4 particles forming Fe-O-As(III)/Fe-O-Cr(VI) complexes with the As(III)/Cr(VI) adsorbates. Evaluation via the green degree method demonstrated that transforming sewage sludge into biochar exerts very low impacts on the environment. Hence, this work offers a green alternative to convert the hazardous sewage sludge into value-added biochar materials, which can be further exploited as supporting frameworks for multifunctional catalysts or expanded to be investigated in reducing carbon footprints and energy conversion areas.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Qian Chen,Xiao Wang,Wanyan Liu,Tao Luo,Zhen Jin,Yong Zhang,Jian Huang,Hua Zhang,Jinhua Wang,Fumin Peng
Currently, Cr(VI) poses a great threat to the human health and ecosystem due to its acute toxicity and potential carcinogenicity. In order to quickly and efficiently reduce Cr(VI) to Cr(III) by photocatalysis , a new In 2 S 3 -ZnIn 2 S 4 heterostructure hierarchical microtubes, which is based on the combination of the main three strategies for the enhancement of photocatalysts’ performance including semiconductor heterostructure, hierarchical microstructure, and hollow morphology, were designed and successfully synthesized via a facile liquid chemical treatment of metal-organic frameworks pre-synthesized as a self-sacrificing template. The microstructure, composition and photocatalytic properties of In 2 S 3 -ZnIn 2 S 4 composite were investigated by means of SEM, TEM, XRD , XPS, PL and electrochemical techniques . The photocatalytic reduction performance of In 2 S 3 -ZnIn 2 S 4 composites are much better than that of pure In 2 S 3 and ZnIn 2 S 4 under visible light irradiation . For the best photocatalytic activity of the as-prepared sample, the Cr(VI) with the initial concentration of 80 mg/L in the water can be photocatalytic reduced 93.4% in 10 min under visible light irradiation, which meet the requirement of design well.
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