JOURNAL OF MOLECULAR LIQUIDS
·
2017
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IF 3.648
Qianwei Liang,Junjie Geng,Hanjin Luo,Wei Fang,Yuwei Yin
In the present study, a novel magnetic Cr(VI) ion-imprinted polymer (MGOIIP) was prepared by a sol-gel process for fast and selective adsorption of Cr(VI) anions from aqueous solutions. In the synthesis process, 4-vinyl pyridine (4-VP) and 2-hydroxyethyl methacrylate (HEMA) were used as functional monomer and co-monomer; ethylene glycol dimethacrylate (EGDMA) and N , N -azoisobisbutyronitrile (AIBN) were used as cross-linker and initiator, respectively; acetone was selected as solvent. Fe 3 O 4 @SiO 2 nanoparticles were introduced for separating adsorbents from the aqueous solution conveniently, and graphene oxide (GO) could prevent Fe 3 O 4 @SiO 2 particles from aggregating. Some different techniques including Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), SEM-energy dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD) and thermogravimetric analysis (TGA) were used to confirm the successful synthesis of ion-imprinted polymer on the surface of Fe 3 O 4 @SiO 2 /GO nanoparticles. The obtained magnetic ion-imprinted polymer has a high adsorption capacity (up to 311.95 mg/g) for Cr(VI) anions at an optimal pH of 2.0, and the adsorption equilibrium can be reached within 3 min. The adsorption process can be fitted well with Langmuir isotherm model and the pseudo-second-order kinetic model . Moreover, the results showed that MGOIIP has excellent selectivity and good regeneration ability. The prepared MGOIIP exhibited a satisfactory recovery for Cr(VI) anions in tap, river and lake water samples.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Zhiyan Yan,Chenrui Liu,Yun Liu,Xiaoqian Tan,Xinyue Li,Yan Shi,Chunlian Ding
Cr(VI) contaminated water usually contains other contaminants like engineered nanomaterials (ENMs). During the process of microbial treatment , the inevitable interaction of Cr(VI), ENMs, and microorganisms probably determines the efficiency of Cr(VI) biotransformation , however, the corresponding information remains elusive. This study investigated the interaction of ZnO nanoparticles (NPs), Cr(VI), and Pannonibacter phragmitetu s BB (hereafter BB), which changed the process of microbial Cr(VI) reduction. ZnO NPs inhibited Cr(VI) reduction, but had no effect on bacterial viability. In particular, Cr(VI) induced BB to produce organic acids and to drive Zn 2+ dissolution from ZnO NPs inside and outside of cells. The dissolved Zn 2+ not only promoted Cr(VI) reduction to Cr(V)/Cr(IV) by strengthening sugar metabolism and inducing increase in NAD(P)H production, but also hindered Cr(V)/Cr(IV) transformation to Cr(III) through down-regulating Cr(VI) reductase genes. A novel bacterial driven ROS scavenging mechanism leading to the inhibition of Cr(VI) reduction was elucidated. Specifically, the accumulated Cr(VI) and Cr(V)/Cr(IV) formed a redox dynamic equilibrium, which triggered the disproportionation of superoxide radicals mimicking superoxide dismutase through the flip-flop of Cr(VI) and Cr(V)/Cr(IV) in bacterial cells. This study provided a realistic insight into design the applicability of biological remediation technology for Cr(VI) contaminant and evaluating environmental risks of ENMs.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yilin Le,Xing He,Mengnan Liu,Xue Liu,Shidong Zhou,Rongrong Xie,Yu Fu,Huilei Wang,Jianzhong Sun
Hexavalent chromium (Cr(VI)) contaminated in soil or water system poses a serious threat to human health. Developing an efficient remediation strategy and treatment method towards Cr(VI) in situ from wastewater is truly under an urgent demand in many countries or regions suffered from this heavy metal threaten. Converting Cr(VI) to Cr(III) with less toxicity by a biological or photocatalytic reduction processing is commonly considered as one of the effective strategies. However, how to effectively enhance the performance of Cr(VI) reduction processing remains a technical challenge. In line with this issue, a novel approach has been proposed to combine a biological and photocatalytic reduction processing together to improve the Cr(VI) remediation. In this system, a novel Cr(VI)-reducing anaerobic bacterium Paraclostridium bifermentans G3 isolated from termite’s gut would detoxify Cd(II) to cadmium sulfide (CdS) nanoparticles that could be precipitated in situ on the cell surface to create a CdS- Paraclostridium bifermentans complex. More importantly, with this complex system, the Cr(VI) reduction processing was significantly improved, where Cr(VI) was completely reduced by the complexes in the case of Cr(VI) concentration at 260 mg/L after 90 min under light culture. As a comparison, if the biological agent, P. bifermentans, was applied alone, it would come out a different reduction efficiency at 81.9% of Cr(VI) after 90 min reaction. These results suggested that the proposed complex system of Cr(VI)-reducing bacteria combined with CdS nanoparticles may potentially provide a novel and in-situ approach for a sustainable enhancement of Cr(VI) remediation to wastewater.
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MOLECULES
·
2024
·Vol. 29
·期 22
·5459
·
IF 4.2
Hao Peng,Zonghui Qin,Guixuan Jin,Jingjing Wang,Jielin Qin,Lihua Ao,Bing Li
In this paper, tartaric acid (C4H6O6) was used as a reductant to treat chromium (VI)-containing solution. Several independent experimental parameters, including reaction temperature, concentration of H2SO4, concentration of C4H6O6and reaction time, on the reduction process were studied. The results showed that 100% of the Cr (VI) could be reduced by C4H6O6in a strong acidic environment under a high reaction temperature. All of the experimental parameters showed positive effects on the reduction process and followed the order [H2SO4] > [C4H6O6] > reaction temperature > reaction time. A higher concentration of tartaric acid and higher reaction temperature could facilitate the reduction process and reduce reaction time.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Yang Yanzhi,Xu Mingchen,Jin Wenlou,Jin Jiacheng,Dong Fan,Zhang Zhipeng,Yan Xin,Shao Min,Wan Yushan
In this study, a polyaniline/mesoporous silica (PANI/MCM-41) composite material that can be used as a filler for permeable reactive barrier (PRB) was prepared by in situ polymerization. Firstly, the adsorption capacity of PANI/MCM-41 on Cr (VI) in solution was investigated. The results show that the prepared PANI/MCM-41 exhibits a significant Cr (VI) adsorption capacity (~ 340 mg/g), and the adsorption process is more accurately described by the Langmuir isotherm and pseudo-second-order kinetic model. The thermodynamic functions evidenced that the Cr(VI) adsorption was an endothermic spontaneous process. In addition, adsorption–desorption cycle experiments proved the excellent reusability of the material. Subsequently, the material was utilized as a filler in the PRB for the remediation of Cr(VI)-contaminated soil using electrokinetic-permeable reactive barrier (EK-PRB) technology. The results show that compared with traditional electrokinetic remediation, the use of PANI/MCM-41 as an active filler can enlarge the current during remediation and enhance the conductivity of soil, which increases the removal rates of total Cr and Cr(VI) in soil (17.4% and 10.2%).
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 15
·17446-17457
·
IF 2.914
Gao Zhao,Yang Hanpei,Fu Xiaofei,Jin Qiu,Wu Qiangshun,Kang Li,Wu Junming
Slow and random transfer of pollutants and photo-induced carriers on photocatalysts causes loss of efficiency in photodegradation of contaminants. Enhancing and directing mass transfer of them are considered as two major methods for improving the photodegradation of pollutants over photocatalysts. Here in this work, we focused on the design of a novel photocatalyst which not only accelerated the transfer rate of Cr(VI) and electrons but also provided specific transfer routes for them. By careful characterizations, it is indicated that 2-((2-(2-aminoethylamino)ethylimino)methyl)phenol (AEMP) was covalently attached onto activated carbon (AC), which enhanced Cr(VI) transfer from bulk solution to AC through electrostatic or coordinative interactions. The external mass transfer coefficient ( K f ) of Cr(VI) over TiO 2 /AC-AEMP was estimated as 1.75 × 10 −6 m s −1 , which was ~ 12.79 and ~ 5.96 times that of TiO 2 and TiO 2 /AC, respectively. Dense and homogeneous heterojunctions between AC and TiO 2 were acquired synchronically by forming Ti–O–C linkages, which increased traveling of electrons from TiO 2 to AC. Accordingly, Cr(VI) can capture photo-induced electrons on the surface of AC via concrete routes and then be reduced efficiently. The results showed that the photoreduction rate of Cr(VI) on TiO 2 /AC-AEMP reached to ~ 92.7%, and the overall photocatalytic activity of this well-designed TiO 2 /AC-AEMP has been enhanced significantly by 5.5 times compared to TiO 2 /AC. The enhanced photocatalytic activity of TiO 2 /AC-AEMP was mainly attributed to an improved synergetic process of mass transfer–induced adsorption–photoreduction by forming specific transfer routes for accelerative motion of Cr(VI) and electrons. This work provides a feasible strategy to improve the photoactivity of photocatalysts for the degradation of pollutants by effective mass transfer.
Graphical abstract
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Zongying Zhang,Qinze Liu,Tingting Gao,Congde Qiao,Jinshui Yao,Changbin Zhang
Alkaline lignin, a by-product of the paper-pulping process, can undergo phenolation by pyrogallol in the presence of acetone and sulfuric acid to prepare phenolated-alkaline-lignin (PAL). PAL can be further reacted with tetraethylenepentamine (TEPA) to prepare lignin-based catecholamine (PAL-TEPA), which exhibits excellent ability to remove hazardous Cr (VI) from simulated wastewater. In this study, PAL and PAL-TEPA were systematically investigated by SEM, FT-IR, 1 H NMR, TGA, and XPS. The conditions for the preparation of PAL and the various variables affecting the adsorption behavior of PAL-TEPA were optimized sequentially. The adsorption process followed the pseudo-second-order model and fitted to the Langmuir isotherm equation. The maximum adsorption amount reached 600 mg g −1 ( R = 75 %) under optimized conditions (pH = 2.0, C 0 = 200 mg L −1 , V = 100 mL, T = 30 °C, dos. = 25 mg, t = 24 h). Toxic Cr (VI) ions were successfully converted to harmless Cr (III) ions and removed by PAL-TEPA adsorbent. This approach opens new avenues for the utilization of lignin and new kinds of adsorbent for Cr (VI) removal.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Aiqun Kong,Yawei Sun,Mao Peng,Hongzhi Gu,Yan Fu,Jinli Zhang,Wei Li
Amino-functionalized MXenes (NH 2 -Ti 3 C 2 T x ) were constructed with the feature of strong adsorption but also reduction ability for Cr(VI) ions in aqueous solution, via in situ polymerization of (3-aminopropyl)triethoxysilane (APTES) onto the surface of multilayer Ti 3 C 2 T x . Amino groups and Ti 3 C 2 T x nanosheets exhibit synergistic effects in the adsorption and reduction of Cr(VI) anions. The maximum adsorption capacities for Cr(VI) onto NH 2 -Ti 3 C 2 T x -0.5 calculated by Langmuir model are 107.4 mg/g. Meanwhile, Ti(Ⅱ) species and -NH 3 + are individually oxidized into Ti(Ⅳ) species and NO 3 − during the removal of Cr(VI). The NH 2 -Ti 3 C 2 T x -0.5 nanosheets exhibit high selectivity and reusability for Cr(VI) removal. Density functional theory calculations illustrate that the synergy between Ti and N remarkably boost the binding energy of MXene toward Cr(VI) along with the electron density on MXene surface. This work provides deep insights into functionalized MXene nanosheets in the fields of heavy metal remediation.
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Biomass Conversion and Biorefinery
·
2024
·
IF 3.5
Zhang Wenrui,Huang Jintian
The non-biodegradability and microtoxicity of harmful anions in water, especially hexavalent chromium, have caused serious damage to the environment and human health. Therefore, research on efficient and environmentally friendly adsorbents for the removal of Cr(VI) becomes essential. In this paper, we propose for the first time to effectively remove Cr(VI) anion by aminated graphene oxide/cellulose oxide nanocellulose/sodium alginate porous materials (NH 2 -GO/NOC/SA) prepared by cross-linking aminated graphene oxide with biomass materials (oxidized nanocellulose and sodium alginate) via epichlorohydrin. The porous materials were characterized using tools such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), electroluminescence (EDS), Brunauer Emmett Teller (BET), and X-ray photoelectron spectroscopy (XPS) analysis. The optimum adsorption performance of the porous material was obtained by varying the initial concentration (from 100 to 500 mg/L), pH (from 1 to 8), and adsorption time (from 15 min to 72 h) of the Cr(VI) solution. The analysis of the adsorption data showed that the adsorption process was more in line with the pseudo-second-order kinetic equation and Langmuir isotherm model, and the equilibrium adsorption amount reached 394.1 mg/g. The adsorption of Cr(VI) on the NH 2 -GO/NOC/SA porous material was achieved by electrostatic interactions, Schiff base chemical bonding energy, ion exchange, protonation, precipitation, and hydrogen bonding. In conclusion, the experimental results show that the biomass adsorbent NH2-GO/NOC/SA can be consistently applied to remove Cr(VI) from wastewater. Graphical
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 34
·e52799
·
IF 3.057
Wei Jia,Jiang Du,Ming Jiang,Mengying Zhang,Enlin Han,Hongqing Niu,Dezhen Wu
In order to overcome the shortcomings of nanofiber membranes such as low mechanical properties and poor acid resistance, amino-rich functionalized polyimide (PI)-polyethyleneimine (PEI) fibers were successfully prepared in the study. The structure and morphology in each functionalization step were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), static contact angle, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS) measurements. The adsorption kinetics analysis showed that the adsorption process followed a pseudo-second-order model, and the adsorption isotherm could be described better by the Langmuir model indicating the adsorption process was mainly chemical and homogeneous monolayer adsorption. Furthermore, the maximum adsorption capacity based on the Langmuir model was about 50 mg g −1 , and the calculated thermodynamic parameters demonstrated an endothermic process. Meantime, the PEI-grafted PI fibers also exhibited good regeneration performance and stable tensile strength during recycling tests process. In the first 3 adsorption–desorption cycles, the removal efficiency and tensile strength of PI-PEI fibers could be maintained up to 60.44% and 89.29% of the initial adsorption, respectively. This work achieved the function of removing Cr (VI) by combining the excellent high temperature resistance, acid resistance, and mechanical properties of PI fibers.
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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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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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