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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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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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 SCIENCE
·
2025
·
IF 4.3
Meng Lan,Xiaoli Dong,Nan Zheng,Yubo Zhang
The construction of green and efficient photocatalysts for the treatment of heavy metals in wastewater through simple strategies is still an extremely huge challenge. Herein, SnS/Bi 2 S 3 Z-scheme heterostructure photocatalyst with abundant sulfur vacancies was fabricated by one-pot hydrothermal approach and exploited for the efficient elimination of hexavalent chromium (Cr(VI)). Due to the tight contact interface of the in-situ heterostructures, charge transfer was carried out quickly and photogenerated carrier separation was accelerated. Moreover, the unique charge transmission path of the Z-scheme can efficiently inhibit the reorganization of active carriers. The abundant sulfur vacancies can further improve the photogenerated carrier separation efficiency. SnS/Bi 2 S 3 -2 can achieve effective reduction of Cr(VI) with the efficiency of 91.6 % under 30 min visible light illumination. This study provides a promising photocatalyst for the treatment of chromium hexavalent sewage, and effectively promotes the exploration of one-step construction of heterostructure photocatalyst in the field of water environment remediation.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Wen Li,Haohu Li,Yaohong Yang,Li Liu,Peng Wang,Linkun Xie,Xijuan Chai,Kaimeng Xu,Guanben Du,Lianpeng Zhang
s The presence of substantial quantities of heavy metals and organic substances in industrial wastewater poses a risk to the wellbeing of flora and fauna if released straight into the environment. Consequently, processing the wastewater prior to its release into the environment is essential. While adsorbents are capable of efficiently capturing pollutants from wastewater, the management of these pollutants post-absorption remains a concern for researchers. Photocatalytic methods are capable of breaking degradation or reduction pollutants, and cuprous oxide (Cu 2 O) has been shown to be a photocatalyst that can rapidly degrade pollutants. In this research, a novel composite of aminated cellulose (AC) modified Cu 2 O (AC-Cu) was prepared. We found that -NH 2 on the AC could make AC stably adsorbed on the surface of Cu 2 O on the one hand, and on the other hand, -NH 2 could adsorb pollutants to the vicinity of the material, which could accelerate the photocatalytic rate. This composite was able to achieve a synergistic adsorption-photocatalytic effect, enhanced the degradation rates of Cr 6+ (Cr(VI)) and Congo red (CR) by 2.4-fold and 2.3-fold, respectively, compared with that of pure Cu 2 O under 10 W of blue light irradiation. The AC-Cu composites also performed well in the cycling experiments, and after 5 uses of the AC-Cu composites, we fund that the AC was able to effectively mitigate the photocorrosion phenomenon during the photocatalytic process and enhance the catalyst lifetime.
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Environmental Science-Water Research & Technology
·
2025
·
IF 3.1
Kunlun Yang,Yimei Wang,Dengyang Wang,Zengshuai Zhang,Peng Gu,Xueli Ren,Hengfeng Miao
Combined with the separation and dehydration treatment of digestate from anaerobic digestion and acidification of food waste, sulfur-modified digestate biochar was facilely prepared for efficient Cr(VI) removal to realize anaerobic digestate recycling and waste control by waste. Characterization indicated the increased surface area and mesopores and the decreased aggregation degree for biochar under optimized S doping and pyrolysis temperature (900-2S@DBC), resulting in more functional groups with high reducibility (e.g., phenolic -OH, C-S-C, S species with low valency) and improved electron transfer ability. The forms transformation analysis confirmed the reduction of sulfate source via carbon under high pyrolysis temperature. Under the conditions of an initial Cr(VI) concentration of 10 mg/L, a pH of 3, and a dosage of 0.5 g/L, the removal efficiency of Cr(VI) by 900-2S@DBC approaches 100%. 900-2S@DBC showed apparent higher Cr(VI) removal performance than other biochar. Its quasi-second-order kinetic constant was tens of times than pristine biochar. Quenching and control experiments confirmed the S species with low valency played a more important role in Cr(VI) reduction than traditional carbon and oxygen based reductive groups on carbon structure. Direct surface electron reduction made more contribution than indirect solution •O2- reduction pathway, further confirming the synergistic effect between Cr(VI) sorption and reduction. Complexation, precipitation, and ion exchange processes participated in the final immobilization of Cr by 900-2S@DBC. Additionally, 900-2S@DBC exhibited excellent Cr(VI) removal capacity in real electroplating wastewater. This study offered a feasible approach for resource utilization of anaerobic digestate and deep insights for Cr(VI) removal mechanism via sulfur-modified biochar.
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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
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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PubMed
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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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Qian Zhou,Derong Liu,Guoyuan Yuan,Yi Tang,Kuncheng Cui,Songshan Jiang,Yongde Xia,Wei Xiong
Novel Ti/PbO 2 -Cr-PEDOT electrodes were prepared by electrodeposition for electrochemical degradation of phenolic wastewater. The electrodes were characterized by XRD, SEM-EDS, XPS, and FT-IR to study the crystalline, surface morphology, elements distribution, and microstructure of the electrodes. A flat and compact interface was obtained with Cr and PEDOT doping into β-PbO 2 plate by electrodeposition method. The linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were conducted to explore the electrochemical performance of the prepared electrodes. The Ti/PbO 2 -Cr-PEDOT electrode exhibited a higher oxygen evolution potential (OEP, 2.53 V vs SCE) and a lower charge transfer resistance compared with Ti/PbO 2 . Phenol degradation efficiency of 100% and TOC removal rate of 95.02% were achieved in the electrochemical degradation of phenol within 120 min. The optimal process parameters (phenol concentration = 1000 mg·L -1 , electrolyte concentration = 4.0 g·L -1 , current density = 15 mA·cm −2 and electrode distance = 3 cm) in the process of electrochemical oxidation of phenol wastewater were explored. Active species trapping experiments proved that ·OH radicals played an important role in the electrochemical system. Furthermore, the electrode also showed high activity for the degradation of other phenolic wastewaters such as phloroglucinol (η DEP = 100%), bisphenol A (η DEP = 97.17%) and p-chlorophenol (η DEP = 89.77%) within 60 min. A possible degradation pathway was proposed based on the intermediate products determined by HPCL. The Ti/PbO 2 -Cr-PEDOT electrode showed excellent stability with only 3% loss of degradation efficiency (η DEP = 96.95%) after recycling tests for 5 times. These results suggest that Ti/PbO 2 -Cr-PEDOT is a promising electrode for electrochemical degradation of phenolic wastewaters.
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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
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
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