Desalination and Water Treatment
·
2026
·
IF 3.4
Xiaolan Shen,Zhenbo Peng,Jiang Shen,Wenting Si,Ningru Sun,Hao Li,Rui Shen
In this study, a membrane-free electrodeionization (MFEDI) technology was demonstrated first time for the removal of hexavalent chromium (Cr(VI))-containing wastewater. Two packing configurations, namely, layered semimixed packing MFEDI (LSMP-MFEDI), and fully mixed packing MFEDI (FMP-MFEDI), were comprehensively investigated for Cr(VI)-containing wastewater treatment. During the treatment stage, the treatment capacity of FMP-MFEDI (132 h) was twice that of LSMP-MFEDI (60 h), with the effluent conductivity under 1 μS/cm. The enhancement is primarily due to the initial adsorption of dichromate(Cr 2 O 7 2- ) by quaternary amine groups, which promotes the co-adsorption activity of tertiary amines. More importantly, during the electroregeneration stage, FMP-MFEDI (229.7 mg/L) exhibited higher regenerated average Cr(VI) concentrations than LSMP-MFEDI (170.5 mg/L), along with a reduced energy consumption (0.19 kWh/g for FMP-MFEDI, 0.25 kWh/g for LSMP-MFEDI) and an increased water recovery rates (95.6% for FMP-MFEDI, 94.1% for LSMP-MFEDI). Such an enhanced electroregeneration performance in FMP-MFEDI was because that the strong-base and weak-base anion-exchange resins fully interact to form a “contact face”, which comprises both tertiary and quaternary amine functional groups. The tertiary groups promoted the release of Cr 2 O 7 2- from the quaternary groups, thereby showing a synergistic effect in electro-releasing the adsorbed Cr 2 O 7 2- . This provides abundant localized ion-depletion regions, consequently enhancing the electroregeneration property.
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JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Min Xu,Xiaoli Ma,Yahui Chen,Luzeng Hu,Bo Wang,Muqing Qiu
Nanoscale zero-valent iron/biochar (nZVI/biochar) has been widely utilized in environmental remediation due to its excellent removal efficiency, easy synthesis, low-cost and environmental friendliness. Herein, the removal and interaction mechanism of Cr(VI) removal on nZVI/biochar was investigated by macroscopic and microscopic techniques. Compared to nZVI (25.84 mg/g), the high removal capacity (63.29 mg/g at pH 4.5), excellent reusability and chemical stability of nZVI/biochar were due to various oxygen-bearing functional groups and synergetic interaction. According to analysis of X-ray photoelectron spectroscopy (XPS), X-ray absorption near-edge fine (XANES) and extended X-ray absorption fine structure (EXAFS) spectra, the interaction mechanism of Cr(VI) on nZVI/biochar followed adsorption (complexation, electrostatic interaction), reduction and co-precipitation process with increasing reaction time. These findings are crucial for the application of nZVI/biochar for removal of heavy metals in actual environmental cleanup.
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FUEL
·
2023
·
IF 7.4
Haoyue Fu,Weixin Qian,Haitao Zhang,Hongfang Ma,Weiyong Ying
Unmodified Cr/Al 2 O 3 and Cr/Al 2 O 3 doping with different alkali metals (Li, Na, K) were prepared by the incipient wetness impregnation method. The surface elements of all the catalysts are evenly distributed and well loaded, and the addition of alkali metals does not change the crystal structure and surface texture. Both Cr 6+ and Cr 3+ species exist on all catalysts, and the addition of alkali metals can increase the amount of Cr 6+ species, and Cr 6+ species are basically converted into active Cr 3+ species in the reaction thus increasing the initial propane conversion in the reaction. The addition of alkali metals reduced the amount of total acid sites and the strong acid sites of the catalyst, thus inhibiting the occurrence of side reactions and the formation of carbon deposition , and reducing the deactivation rate of the catalyst. Cr-0.5Na/Al 2 O 3 exhibited the best catalytic performance and the lowest carbon deposition.
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BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Yu-Nan Zhang,Jian-Zhong Guo,Chunzheng Wu,Wei-Wei Huan,Lin Chen,Bing Li
Chemical modification on hydrochars can significantly improve their ability of removing heavy metal ions from wastewater, but so far no research has focused on the chemical modification through free radical reaction. In this work, a cation functionalized hydrochar (CFHC) bearing − N + H 2 R was synthesized by grafting-polymerization of glycidyl methacrylate (GMA) onto bamboo hydrochar under initiation by benzoyl peroxide, followed by the amination with the introduced epoxy group and diethylenetriamine and a subsequent hydrochloric acid treatment. The resulted CFHC exhibited a superior removal capacity of 424.09 mg·g −1 for Cr(VI), and the highest sorption occurred at pH of 2. Combining a series of characterizations and tests, it was concluded that the sorption conformed to the pseudo-second-order and Freundlich equations, indicating a multilayer chemisorption process that mainly driven by electrostatic reaction, reduction, and surface complexation. This research proved that a free radical polymerization treatment could effectively transform hydrochars into super adsorbents for wastewater treatment.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Qiuyu Cheng,Xin Chen,Lin Liu,Peng Jiang,Deshi Song,M.A. Subramanian
Novel green and blue chromophores based on Ni/Co/Cr doped BaMg 6 Ti 6 O 19 solid solutions are successfully synthesized through a solid-state reaction. The crystal structure of all the samples belongs to the magnetoplumbite structure with the space group of P 6 3 / mmc . The BaMg 6- x /2 Ti 6- x /2 Ni x O 19 (0 ≤ x ≤ 0.3) compounds exhibit a light green ( x = 0.1) to yellow-green ( x = 0.3) color. The oxidation state of Ni is confirmed to be +2 valence and the d-d transition of Ni 2+ in octahedral sites is responsible for color. BaMg 6- x /2 Ti 6- x /2 Co x O 19 (0 ≤ x ≤ 0.3) series show a blue color and the intensity of blueness is increasing with the increase of Co content. The blue color is due to d-d transitions within Co 2+ present in the tetrahedral sites. For BaMg 6- x /2 Ti 6- x /2 Cr x O 19 (0 ≤ x ≤ 2) phases the color varies from light green ( x = 0.2) to green ( x = 2). Chromium exists in +3 and + 6 oxidation states and the observed color is due to charge transfer transition between Cr 3+ –Ti 4+ and d-d transitions within octahedral Cr 3+ sites resulting in strong absorption in the visible region. The synthesized colored oxides are mixed with PMMA to prepare novel green and blue PMMA polymer composites to evaluate their compatibility in plastics.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xuheng Li,Chunli Wang,Feng Liu,Zhihao Zhang,Jafar Ali,Qingwen Long,Jing Zhang
Electrochemical reduction and treatment of Cr(VI)-contaminated wastewater normally suffer from a high overpotential, due to the extravagant consumption of electrons by the adverse reactions of hydrogen evolution and oxygen reduction. In this work, the MoS 2 film electrode prepared by electrochemical deposition-annealing method was applied into the electrochemical reduction of Cr(VI), with the aim to suppress the over-potential of the reduction and improve the utilization of electrons. Results demonstrated that the 2H/1T′ heterostructure of MoS 2 enhanced the reduction efficiency of Cr(VI) up to 99% at a lower potential of −1.0 V vs. Ag/AgCl. The in-situ electrochemically generated hydrogen peroxide was found to play a critical role in accelerating the reduction of Cr(VI). Selective oxygen reduction reaction (ORR) via a two-electron pathway on the MoS 2 cathode was responsible for the formation of hydrogen peroxide, where the MoS 2 film electrode annealed at 700 °C can obtain a high productivity of 360 μM hydrogen peroxide within 60 min. The plenty of preserved interfaces between 2H and 1 T′ in the heterophase MoS 2 were crucial to the selective electrocatalytic activity. In addition, this electrode also presented an excellent electrocatalytic activity in hydrogen evolution reaction (HER), which could form atomic hydrogen on the surface of cathode to facilitate the reduction of Cr(VI) under the anoxic condition. This study paves a novel pathway to in-situ deposit the MoS 2 film electrode for the sustainable electrochemical reduction and treatment of Cr(VI)-containing wastewater.
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Advanced Materials Interfaces
·
2020
·Vol. 7
·期 9
·1901879
·
IF 4.948
Shuaishuai Peng,Jingxia Yang,Lei Guo,Jinjie Wang,Jiachang Zhao,Jingli Xu,Zhiquan Li
CeO 2 with different morphologies (nanoparticles/NP, nanorods/NR, nanocubes/NC, nano-octahedra/NO) are synthesized and decorated on BiOI nanoplates substrates to form CeO 2 @BiOI composites, which are used for aqueous Cr(VI) degradation. The intersurface states between BiOI and diverse CeO 2 nanoparticles exhibit distinct behaviors when checked by XPS and photoluminescence intensity. The Cr(VI) degradation results show that the synthesized CeO 2 @BiOI nanocomposites possess higher photocatalytic activity than pure CeO 2 or BiOI, and the CeO 2 -NP@BiOI nanocomposite (molar ratio of CeO 2 : BiOI = 1:2) is the best one among them, with which the Cr(VI) is degraded up to 95.0% after 30 min irradiation using it as the photocatalyst. The superior catalytic performance of CeO 2 -NP@BiOI can be attributed to a higher Ce 3+ ratio of CeO 2 -NP, a larger specific surface area, relatively low OH/CO 3 2− content on the composite surface, and especially the good interaction between the CeO 2 (111) facet and the BiOI surface.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Nian Liu,Yuqi Zhang,Jiaoyan Huang,Sicong Liu,Taiping Qing,Peng Zhang,Bo Feng
In the realm of sensing, carbon dots (CDs) have exhibited remarkable fluorescence characteristics. In the field of catalysis, CDs can function concurrently as electron donors and acceptors and have substantial electron or hole transport capacities. In this study, both merits were integrated into one, and a one-step hydrothermal approach was used to create multifunctional CDs. On the one hand, CDs are employed as a fluorescence probe with good sensitivity and selectivity to detect Cr(VI). On the other hand, CDs exhibit strong photoreduction capabilities for Cr(VI) in the absence of any external cocatalysts or photosensitizers when acting as photoinitiators. The results show that Cr(VI) quenches the CDs fluorescence as a result of the combined effects of static quenching and the inner filter effect. At the same time, under the condition of illumination, the inner filter effect encourages the CDs electrons to move from the valence band to the conduction band, resulting in electron hole pairs. With the help of electrons' reducing power, Cr(VI) can be rapidly and effectively converted to Cr(III). The findings of this study suggest that CDs are a satisfying bi-functional carbon-based material with significant potential for the treatment of industrial wastewater.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 41
·94185-94194
·
IF 5.8
Chen Zi-Le,Zhang Yu-Nan,Guo Jian-Zhong,Chen Lin,Li Bing
Hydrochar is an environmentally friendly and cheap adsorbent, but its adsorption amounts for anions is very limited. The functionalized hydrochar can overcome this shortcoming. Herein, polyethyleneimine-modified hydrochar (PEI-HC) was synthesized from hydrothermal carbonization (HTC) of methyl acrylate and bamboo after addition of initiator ammonium persulfate, and then modified by polyethyleneimine (PEI), which was used to treat Cr(VI). PEI-HC was tested by XANES, EXAFS, SEM-EDS, XPS, FTIR, N 2 sorption isotherms, zeta potential, and elemental analyses. The characterizations showed that PEI was successfully grafted onto hydrochar, and the PEI-HC was rich in N and O functional groups, which presented high Cr(VI) sorption ability (528.41 mg·g −1 at pH 2). The bath experiments found the pseudo-second-order kinetic and Freundlich equations can well describe the adsorption kinetics and isotherm of the Cr(VI) adsorption onto PEI-HC, respectively. Electrostatic interaction, reduction, complexation, and H-bonding are the main removal mechanisms as supported by XANES, EXAFS, XPS, and FTIR. This study provides a strategy of combining HTC and free radical graft polymerization to convert agricultural and forestry wastes into functionalized hydrochar, showing highly efficient removal of Cr(VI).
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yefan Qing,Wei Gao,Yantong Long,Yijin Kang,Chen Xu
The removal of toxic Cr(VI) is a hot topic in the environmental remediation field. In this work, a Ti-based metal–organic framework (MOF) (MIL-125(Ti)-NH2) was successfully functionalized by introducing amidoxime groups for the first time. The functionalized material (MIL-125(Ti)-AO) exhibited excellent Cr(VI) adsorption performance with a maximum adsorption capacity of 271 mg·g–1 according to Langmuir fitting. More importantly, during the adsorption process, Cr(VI) could be simultaneously reduced to less toxic Cr(III) species, and the residual concentration of chromium in the treated water was below the drinking water limit (0.05 mg·L–1) recommended by WHO. The effects of initial pH, contact time, and the initial concentration of Cr(VI) and the presence of competitive ions on the Cr(VI) adsorption performance of MIL-125(Ti)-AO were systematically investigated. The excellent Cr(VI) removal performance of MIL-125(Ti)-AO was attributed to the synergistic effects of simultaneous adsorption of Cr(VI) and Cr(III) by a [Ti–O] bond when Cr(VI) was reduced to Cr(III) by amidoxime groups.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 1
·163-176
·
IF 3.442
Yu Sheng,Yuan Guoming,Gao Hejun,Liao Yunwen
The self-assembled polymer nanotubes were obtained by a simple solvothermal method. Its physicochemical properties were characterized by SEM, BET, TGA, FT-IR, XPS, and solid-state 13 C magnetic resonance. The effects of initial pH, dosage, and coexisting ions were evaluated for its Cr(VI) adsorption performances. The result showed that polymer nanotubes surface had a large number of organic functional groups and porous structures. In 140 mg/L Cr(VI) solution, polymer nanotubes obtained the largest Cr(VI) adsorption capacity of 147.81 mg/g. Adsorption kinetics and isotherms agreed well with the pseudo-second-order and Redlich–Peterson models, respectively. The desorption process showed that the polymer nanotubes were easy to regenerate in strong polarity solution and had a high removal efficiency. Ionic strength played an important role in the adsorption and the adsorption interaction contained electrostatic interaction, reduction, and chelation in this work. The self-assembly method will constitute a highly efficient adsorbent.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Fengxin Cao,Qiaoling Li,Boya Shan,Zhiwei Qi,Chenyu Zhang,Chengcheng Yu
To create an economical, stable, along highly efficient catalyst for the hydrogen evolution reaction, this paper reports on a Cr-doped self-supported Co-P-Cr/NF high-performance HER catalyst synthesized in one step. It exhibits overpotentials of 41.44 mV at −10 mA cm −2 . Moreover, the impedance is only 0.56 Ω, and the double-layer capacitance value is 40.02 mF cm −2 . After a 12-hour stability test, the catalyst shows only minimal overpotential increase. Using techniques including XRD, XPS, SEM, and TEM, the structure of the electrocatalyst was thoroughly investigated. The introduction of Cr and the excellent electronegativity of P enhance the redox capability and show superior intrinsic electrocatalytic ability in Co-P-Cr/NF catalysts. Therefore, the Co-P-Cr/NF catalyst that has been developed shows promise in replacing costly Pt-based electrocatalysts in the HER.
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