JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yang Yu,Xiaoping Cai,Xinyang Jiao,Chengyi Xu,Jinan Niu,Peizhong Feng
Ni-Al-Cr intermetallic compounds are candidate at extreme environment due to their excellent oxidation resistance at high temperature, and the oxidation resistance of Ni-Al-Cr alloy system has been studied extensively. However, the research on oxidation resistance mechanism of porous Ni-Al-Cr intermetallic compounds is still not deep. In our work, porous Ni-Al-Cr intermetallic compounds were synthesized by thermal explosion, and the oxidation resistance of porous Ni-Al-Cr system was mainly investigated. The results indicate that Cr promotes the formation of highly protective continuous Al 2 O 3 layer, increasing the oxidation resistance at 900 °C of porous Ni-Al-Cr. After oxidation at 900 °C for 120 h, the minimum mass gain of Ni-Al-Cr products is only 6.96%.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Jun Jiang,Zhidong Chen,Peng Wang,Pei-Yang Gu,Jiadi Liu,Zhuzhu Zhang,Qingfeng Xu
At present, hexavalent chromium (Cr(VI)) has a serious impact on the water environment and human beings since it can be easily absorbed by the human body, lethal to aquatic organisms and carcinogenic to humans. Based on this, a black hollow TiO 2 nanotube supported polydopamine (PDA)@Ag 2 S composite photocatalytic material was prepared, which can be used for the efficient photocatalytic reduction of Cr(VI) in wastewater. Both black hollow TiO 2 and Ag 2 S have the shortcoming of undergoing ready recombination of photogenerated carriers. The introduction of PDA can not only improve the photogeneration of composite photocatalytic materials, but also broaden the absorption range in the visible-light region. A detailed mechanism for the TiO 2-x @PDA@Ag 2 S photocatalytic system has been proposed at the same time. This work provides a new methodology for the design and synthesis of sandwich organic-inorganic hybrid photocatalytic materials.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Longwen Li,Lin Chi,Hongxu Zhang,Shuming Wu,Han Wang,Zhimin Luo,Yanwei Li,Yanhui Li
This article prepared a nanoparticle (NP) Ti-PDA made from bis (2-hydroxy propionic acid) diammonium titanium hydroxide (Ti-BALDH) chelating dopamine (DA), as a photocatalyst to absorb and reduce hexavalent chromium (Cr(VI)) under visible light with recycling ability from waste water. Ti-PDA NPs with part of TiO 2 -like structure can perform some function of TiO 2 , while participation of PDA will not only broaden absorption spectrum from UV to visible light, but offer the ability to absorb Cr(VI). Compared with TiO 2 Ti-PDA NPs would make full use of sunlight, increasing the photocatalytic efficiency. The adsorption results of Ti-PDA NPs for Cr(VI) showed that the adsorption capacity of Ti-PDA NPs can reach 500.24 mg/g when the concentration of Cr(VI) was 300 mg/L, and the adsorption data matched well with the Langmuir isotherm model, and confirmed to a quasi-second-order dynamics. Under visible light irradiation, Ti-PDA NPs could reduce Cr(VI) to Cr(III) within 30 min, and can almost completely reduce Cr(VI) within 15 min even at pH = 4. After three cycles, photocatalytic reduction efficiency was still 95.02%. Thereby the toxic Cr(VI) can be effectively eliminated by Ti-PDA NPs from sewage. As a result, Ti-PDA will be a promising green photocatalyst to remove Cr(VI) in disposal of water pollution.
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2026
·Vol. 237
·期 22
·1293
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IF 3.5
Li Xi,Zhang Luyao,Liu Ling,Yan Yunxia,Wang Ziqing,Wang Bing
Soil co-contamination by organic pollutants and toxic metals has become an increasingly prominent environmental concern worldwide, largely driven by intensive industrial and anthropogenic activities. In this study, BC-nZVI coupled with three oxidants—persulfate (PS), BS, and hydrogen peroxide (HP)—was evaluated for the simultaneous remediation of BaP and Cr(VI) co-contaminated soil. Among the tested systems, BC-nZVI/BS exhibited the best overall performance, achieving 77.7% BaP removal and 97.6% Cr(VI) reduction, followed by BC-nZVI/HP and BC-nZVI/PS. Among the three systems, the BC-nZVI/BS system maintained comparatively stable remediation performance over the tested pH range. Coexisting Cr(VI) exerted a pronounced synergistic effect on BaP degradation in the BC-nZVI/BS system, likely via promoting oxidant activation. Six classes of intermediates with simpler structures than BaP were tentatively identified, indicating the progressive transformation of BaP during the remediation process. Post-treatment characterization revealed the presence of Cr 2 O 3 , FeCr 2 O 4 , and Cr(OH) 3 , suggesting that Cr(VI) was predominantly removed through reductive precipitation to Cr(OH) 3 . Overall, the BC-nZVI/BS system showed promising potential for the remediation of BaP-Cr(VI) co-contaminated soils.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Rui Xi,Jiayan Zhou,Beibei Jiang,Qi Zhang,Kunkun Zhu,Weilin Xu,Dengpeng Song
Biomass adsorbents have received extensive attention for the removal of heavy metals , but most of them had very limited adsorption capacity or needed to be modified with environmentally unfriendly chemicals to achieve acceptable performance. In this study, a green biomass adsorbent was fabricated using an abundant natural cellulosic Juncus effusus (JE) fiber and natural melanin polydopamine (PDA) through a simple mussel-inspired polymerization strategy. JE's unique hollow three-dimensional network structure provided an ideal scaffold substrate with abundant sites for dopamine polymerization deposition. This enabled the modified PDA@JE fibers to be rich in amino, hydroxyl, and other active adsorption sites, thereby endowing the PDA@JE fiber adsorbent with a promising Cr (VI) adsorption capacity of up to 145.8 mg / g. This capacity was significantly higher than that of most previously reported biomass-based adsorbents. Furthermore, 10–20 times the concentration of common interfering ions such as Ca 2+ , Cd 2+ , Cu 2+ , NO 3 - , Cl - , SO 4 2- and PO 4 3- had little effect on the adsorption efficiency. This study provided a green and general mussel-inspired strategy for preparing effective biomass adsorbent, offering a promising approach for utilizing natural cellulosic fibers in eco-friendly applications.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 99
·期 2
·415-425
·
IF 3.4
Mingliang Chen,Guanghui Wang,Jialing Dai,Haifeng Li,Nansheng Deng
BACKGROUND There is increasing concern regarding the rising issue of Cr(VI) pollution in aqueous solutions. It is crucial to find an effective technology for the removal of Cr(VI) in aqueous solutions. In this work, a novel TiO 2 /BC/g-C 3 N 4 heterostructure photocatalyst was successfully prepared by a simple hydrothermal method and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller analysis, Fourier transform infrared spectroscopy, photoluminescence, ultraviolet–visible diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The photocatalytic reduction behavior of Cr(VI) on the TiO 2 /BC/g-C 3 N 4 heterostructure was investigated under visible light irradiation, and the possible mechanism of photocatalytic reduction of Cr(VI) was elucidated. RESULTS The TiO 2 /BC/g-C 3 N 4 heterostructure photocatalyst exhibited better photoreduction activity for Cr(VI) under visible light irradiation. After 100 min irradiation with visible light, the TiO 2 /BC/g-C 3 N 4 photocatalyst achieved a removal efficiency of 89% for Cr(VI). Compared with TiO 2 , TiO 2 /BC and TiO 2 /g-C 3 N 4 , the photocatalytic removal efficiency of Cr(VI) on the TiO 2 /BC/g-C 3 N 4 increased by 40%, 20% and 10% respectively. The photocatalytic reduction of Cr(VI) was dependent on the initial concentration of Cr(VI), catalyst dosage, pH value and atmosphere. Moreover, TiO 2 /BC/g-C 3 N 4 presented excellent stability and reusability after five cycles. CONCLUSION The TiO 2 /BC/g-C 3 N 4 heterojunction enables highly efficient photocatalytic reduction of Cr(VI) under visible light irradiation. This enhancement is primarily attributed to the construction of an indirect Z-scheme TiO 2 /BC/g-C 3 N 4 heterojunction, which significantly improves the separation efficiency of photo- generated charge carriers during the photochemical process. Furthermore, the presence of BC enhances the adsorption performance of Cr(VI) on TiO 2 /BC/g-C 3 N 4 , thereby facilitating its photocatalytic reduction. © 2023 Society of Chemical Industry.
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高影响因子
Materials Today Sustainability
·
2023
·
IF 7.8
B. Chen,L. Liu,Y. Song,H. Liu,Z. Gong,Y. She,J. Liu,R. Niu,J. Gong
The development of hybrid photothermal materials coupling interfacial solar-driven water evaporation with advanced oxidation process has recently aroused extensive attention to simultaneously realize freshwater production and wastewater purification. However, designing advanced hybrid photothermal materials with high specific surface areas and robust active sites remains challenging to meet the distinct requirements of photothermal conversion and photocatalysis . Herein, we report the waste-to-metal-organic framework (MOF) strategy for converting waste poly(ethylene terephthalate) [PET] into Cr-MOF hexahedron with abundant active sites and large specific surface area (896.1 m 2 /g), and subsequently fabricate multifunctional chromium-based metal-organic frameworks (Cr-MOF)/carbon nanotube (CNT) composite solar evaporators in a cost-effective, scalable manner towards simultaneous interfacial solar-driven steam generation and stubborn contaminant removal . First, the composite evaporator presents high light absorption (98%), high photothermal conversion efficiency, super-hydrophilicity, low thermal coefficient (0.087 W/(m/K)) and low vaporization enthalpy. Accordingly, the composite evaporator not only holds a high evaporation rate (2.46 kg/(m 2 /h)), superior to most of advanced solar evaporators, but also owns good flexibility and long-term stability. Subsequently, according to density functional theory (DFT) calculation and COMSOL results, chromium sites of Cr-MOF and local solar heat contribute to the peroxymonosulfate (PMS) activation to produce various reactive species. Thereupon, the composite evaporator exhibits good tetracycline (TC) degradation activity. Finally, in the practical freshwater production and photocatalytic degradation, the freshwater production amount is 7.3 kg/m 2 per day, along with the tetracycline degradation efficiency of 92.4%. This work provides an ingenious strategy to massively synthesize hybrid evaporators and concurrently advances freshwater production and pollutant elimination.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Junling Yu,Feng Jiang,Jianmin Liu,Tao Wang,Xiaojun Zhang,Quan Zhang,Rongchi Zhang,Qian Wu,Qing Hu,Yun Yu,Guo Feng
Novel (Cr,V)–ZrSiO 4 jewel green pigments with good near-infrared reflection performance were prepared by in-situ mineralization at a low temperature of 900 °C. The synthesized pigments were characterized through XRD , FE-SEM, TEM, UV–Vis–NIR, XPS, and CIE L*a*b* colorimetry. The results show that Cr–V co-doping into the zircon lattice can effectively promotes the synthesis of zircon, and significantly produce a coloring effect from blue to jewel green and then to dark green with the increase of Cr/Si mole ratio from 0.025 to 0.4. The optimized Cr/Si is 0.2, showing excellent color rendering performance ( L * = 56.69, a * = -18.52, b * = -9.28). The electron transitions of the (Cr,V)–ZrSiO 4 pigments exhibits broadband emission and shifts to longer wavelength (530 nm) relative to V–ZrSiO 4 with Cr/Si mole ratio of 0, corresponding to the jewel green region. And the pigments possess good near-infrared reflectance in the range of 700–2500 nm. The properties especially excellent near-infrared reflection performance make it promising functional pigment for energy-saving and health.
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Sustainability
·
2023
·Vol. 15
·期 18
·13560
·
IF 3.9
Yuan Zhao,Jie Gao,Tian Liang,Tao Chen,Xiaobing Han,Guowen Hu,Bing Li
Biochar is considered to be the most promising substrate for the preparation of environmentally functional materials. The modification of bamboo char can significantly improve the removal rate of toxic ions from wastewater; however, there are few reports that focus on the radiation grafting method. Here, glyceride methacrylate (GMA) is successfully grafted onto bamboo char through electron beam radiation, followed by amination using the existing epoxide group in diethyltriamine, and finally, treated with hydrochloric acid to obtain protonated diethyltriamine-functionalized bamboo char (CDGBC). The results of IR, TG, XRD, and SEM prove the successful fabrication of a CDGBC biosorbent. The results show that the solution pH has a great effect on the adsorption capacity, and a maximum adsorption capacity of 169.13 mg/g is obtained at pH = 2 for Cr(VI). In addition, the adsorption behavior of Cr(VI) onto CDGBC is demonstrated to obey the pseudo-second-order kinetic and Freundlich isotherm models, and thermodynamic analysis exhibits that Cr(VI) adsorption is an endothermic spontaneous process. A possible adsorption mechanism based on the electrostatic interaction, reduction, and surface complexation is proposed, according to the obtained results. This work confirms that radiation-induced grafting modification can effectively transform biochar into a high-performance adsorbent for Cr(VI) removal, offering a new approach to synthesizing an efficient biosorbent.Keywords:bamboo char;radiation-induced grafting;Cr(VI);adsorption;mechanism
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高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Yuecheng Zhang,Chengjia Li,Lingbo Sun,Jie Zhang,Xiaojun Yang,Hongyan Ma
Hexavalent chromium ion (Cr(VI)) is one of the most severe environmental nonbiodegradable pollutants. Considering its high biological toxicity, it is of great significance to establish a method for Cr(VI) analysis with high sensitivity and reliability. Therefore, a simple and sensitive ratiometric sensor is developed according to the coordination between Cr(VI) and carbon dots (CDs). In the presence of Cr(VI), the original CDs photoluminescence (PL) emission at 445 nm was significantly shifted to 565 nm and gradually intensified. The coordination mechanism was investigated, the results indicated that the dual-amino groups at ortho-position of benzene ring is critical for this coordination. Under the optimal condition, a good linear relationship between the concentration of Cr(VI) and the PL intensity ratio I 565 /I 445 was obtained from 120 nM to 200 µM, with a low detection limit of 37 nM. Moreover, this method is applied into real water samples analysis with a high quality.
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Fenglei Liu,Shan Hua,Chao Wang,Muqing Qiu,Limin Jin,Baowei Hu
Herein, a potential bio-adsorbent (DACS-CA) was formed via immobilizing caffeic acid (CA) on dialdehyde corn starch (DACS) for Cr(VI) removal. The characterization techniques such as IR, Raman, XPS and 13 C NMR were performed to analyze surface elements and functional groups on the as-prepared sorbents . Batch experiments revealed that the maximum Cr(VI) removal amount (96.45 mg/g) took place at a pH value of 3.0, adsorption temperatures of 333 K and solid-liquid ratio of 0.2. The isotherms studies found that the Cr(VI) removal of DACS-CA was monolayer adsorption, while the kinetics analysis revealed that chemisorption was the main power for removal process. Characterization analysis found that about Cr(VI) (53.02%) and Cr(III) (46.98%) species co-existed onto the surface of DACS-CA, which implied that a redox reaction may be occurred between Cr(VI) and the bio-adsorbent. Namely, Cr(VI) was first loaded on DACS-CA via electrostatic interaction, subsequently Cr(VI) was partially transformed into Cr(III) by reductive functional groups, meanwhile the resulting Cr(III) was immobilized by the carboxyl groups of DACS-CA. Thus, this bio-adsorbent could serve as an efficient sorbent for the removal of Cr(VI) from wastewater in environmental pollution cleanup.
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PubMed
高影响因子
Polymers
·
2021
·Vol. 13
·期 20
·3498
·
IF 4.329
Shengqi Liu,Ye Meng,Hu Li,Song Yang
Considering economic and environmental impacts, catalytic biomass conversion to valuable compounds has attracted more and more attention. Of particular interest is furfural, a versatile biorefinery platform molecule used as a feedstock for the production of fuels and fine chemicals. In this study, the Cr-based metal-organic frameworks (MOFs) MIL-101 were modified by chlorosulfonic acid, and MIL-101 was changed into a hierarchical MOF structure with smaller particles and lower particle crystallinity by CTAB, which significantly improved the acidic sites of the MOFs. The original and modified MIL-101(Cr) catalysts were characterized by XRD, N2adsorption-desorption, SEM, TEM, and FT-IR. The effects of different catalysts, reaction temperature, catalyst amount, and alcohol type on the reaction were studied. Under the action of the MOFs catalyst, a new mild route for the condensation of furfural with various alkyl alcohols to the biofuel molecules (acetals) was proposed. The conversion route includes the conversion of furfural up to 91% yield of acetal could be obtained within 1 h solvent-free and in room-temperature reaction conditions. The sulfonic acid-functionalized MIL-101(Cr) is easy to recover and reuse, and can still maintain good catalytic activity after ten runs.Keywords:biomass conversion;MIL-101(Cr);furfural;green chemistry;heterogeneous catalysis
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高影响因子
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