ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 32
·40346-40354
·
IF 3.056
Liao Taiwan,Huang Pengwei,Song Huiyu,Guo Jia,Fu Xionghui,Yu Xiang,Peng Liang,Han Boping,Zhu Yi,Zhang Yuanming
In this study, La(OH) 3 -modified magnetic sodium carboxymethyl cellulose (La-MC) was prepared as adsorbents for phosphate, which exhibited excellent adsorption performance up to 62.98 mg P/g and magnetic property for easy recovery. The recovered adsorbents after phosphate sorption were subsequently used for photocatalytic reduction of Cr(VI) and possessed good photocatalytic activity. This work provided an excellent reference for developing a new way of extending life cycle of adsorbents by combining phosphate adsorption with photocatalysis for sequential removal of pollutants from water in the future.
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DESALINATION
·
2020
·
IF 7.098
Haojie Zeng,Zongxue Yu,Liangyan Shao,Xiuhui Li,Meng Zhu,Yuchuan Liu,Xiaofang Feng,Ximei Zhu
A novel photocatalytic membrane was prepared by using graphene oxide (GO), UiO-66-NH 2 and Ag 2 CO 3 as basic materials on the surface of PVDF membrane by vacuum filtration self-assembly. The prepared Ag 2 CO 3 @UiO-66-NH 2 /GO (AgCO@UiO/GO) membrane was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The AgCO@UiO/GO membrane possessed the photocatalytic effects, which significantly enhanced the separation effect of dyes and Cr(VI) wastewater. In particular, the AgCO@UiO/GO membrane can achieve complete removal of MB , RB ,MR and Cr(VI) under light conditions maintaining the fluxes during filtration process reach about 50 L · m −2 · h −1 . In addition, after long-time experiments, the AgCO@UiO/GO membrane retained a higher removal rate and maintained a high flux under light conditions than without light for all dyes and Cr(VI). The unique structure of AgCO@UiO/GO membrane with a large number of screening structures and photocatalytic activity resulting a better removal rate for pollutants and reducing membrane fouling . Furthermore, the AgCO@UiO/GO membrane shows a great potential in improving membrane removal performance and a solution to balance trade-off effect.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yingying Xie,Guining Lu,Xueqin Tao,Zhen Wen,Zhi Dang
A novel collaborative strategy for enhanced removal of Cr(VI) using nano zero valent iron (nZVI) assisted by schwertmannite (Sch) with two synthesis methods was designed. Batch experiments demonstrated that nZVI/Sch-AP (synthesized by abiotic precipitation of Fe 3+ species) exhibited excellent removal performance for Cr(VI) than nZVI/Sch-CO (synthesized by chemical oxidation of Fe 2+ species). The results indicated that the removal efficiencies of Cr(VI) by nZVI/Sch-AP and nZVI/Sch-CO were highly pH-dependent and achieved to be 99.99% and 98.01% under the optimal conditions of 10 mg L −1 Cr(VI) concentration, a pH of 6.3 and a Fe(0)/Cr(VI) molar ratio of 12. But nZVI/Sch-AP emerged greater k of 0.1097 min −1 than that of nZVI/Sch-CO (0.0485 min −1 ). Humic acid exhibited promotion effect on the Cr(VI) removal in low concentration of 1 mg L −1 . Results of XRD and XPS demonstrated that α-FeOOH was the dominant products in both incubations of nZVI/Sch-AP and nZVI/Sch-CO, accompanied with FeCr 2 O 4 and Cr Fe mixed (oxy)hydroxides, and γ-FeOOH was found alone in the incubations of nZVI/Sch-CO. We proposed a consecutive and simultaneous process involving surface absorption-reduction and co-precipitation/immobilization for the removal. This study provides new insights into the elimination of Cr(VI) from wastewater by nZVI/Sch, especially in acid mine drainage .
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Qi Wu,Hui He,Hang Zhou,Fei Xue,Hongxiang Zhu,Shile Zhou,Lei Wang,Shuangfei Wang
A novel multiple active sites cellulose-based adsorbent (MCC/TEPAA-BCTTC) with a high density of multiple active adsorption sites (N, O, S) was prepared by using epichlorohydrin cross-linking microcrystalline cellulose (MCC) with tetraethylenepentamine (TEPA), followed by grafting with bis(carboxymethyl) trithiocarbonate (BCTTC). It was shown that the removal rates of MCC/TEPAA-BCTTC for Pb(II) (1 mg/L), Cu(II) (3 mg/L) and Cr(VI) (1 mg/L) reached 100 %, 98 % and 99 %, respectively, and the remaining concentration after adsorption reached the United States Environmental Protection Agency (US EPA) standards for Pb(II) and Cu(II) and the China integrated wastewater discharge standard for Cr(VI). These results indicate that the high removal rate of MCC/TEPAA-BCTTC for removing anionic and cationic heavy metal ions in low-concentration mixed heavy metal ions environments was mainly due to the high density of multiple adsorption sites that act via multiple cooperative mechanisms.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Debin Zeng,Changlin Yu,Qizhe Fan,Julan Zeng,Longfu Wei,Zesheng Li,Kai Yang,Hongbing Ji
Here, novel fluorine doped Sn 3 O 4 microspheres with highly photocatalytic performance were reported. UV–vis diffuse reflectance spectrum (DRS) and transient photocurrent response test showed the enhanced light harvesting and photo-response. DRS and electron spin resonance (ESR) spectrum confirmed that the enhanced light harvesting could remarkably boost active radical generation. The low recombination rate of free charge carrier and the long lifetime of photon-generated carrier also made great contribution. The lifetime of photon-generated carrier of F 0.2 -Sn 3 O 4 was 1.38 μs, which was 2.76 times of Sn 3 O 4 (0.50 μs). F 0.2 -Sn 3 O 4 reduced 95% of 10 ppm Cr(VI) (pH = 7) under light irradiation (400 W metal halogen lamp, light intensity: 148.36 mW/cm 2 ) for 12 min, which was 3.6, 10.2 and 64.5 times higher than that of Sn 3 O 4 (25.83%), C 3 N 4 (9.25%) and commercial TiO 2 (1.47%), respectively. F 0.2 -Sn 3 O 4 could remove 98% of methyl orange within 4 min comparing with commercial TiO 2 (30%). The highly removing efficiency of phenols (phenol, bisphenol A and p-chlorophenol) was also obtained. Density functional theory (DFT) calculation, Powder X-ray diffraction (XRD) patterns and DRS revealed that the replacement of F − by O 2− enhanced the light harvesting. The work is promising for the synergistic treatment of industrial waste water with organic pollutants (phenols) and Cr(VI).
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WATER AIR AND SOIL POLLUTION
·
2016
·Vol. 227
·期 4
·1-11
·
IF 1.551
Ren Huixue,Jiang Jiahui,Wu Daoji,Gao Zhimin,Sun Youmin,Luo Congwei
Selective adsorption of Pb(II) and Cr(VI) by surfactant-modified and unmodified zeolites is discussed in this paper. The influences of pH, ionic strength, temperature, and adsorption time on Cr(VI) and Pb(II) adsorption are studied, The characteristics of the surface and inner structures of zeolites before and after modification are analyzed through infrared spectroscopy, scanning electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller analysis, and zeta potential measurement. Results show that the characteristics of electric charge on the zeolite surface had changed after modification, which resulted in selective adsorption of Cr(VI) and Pb(II). Moreover, kinetic study reveals that adsorption by the different zeolites coincides with the Langmuir model and pseudo-second-order kinetic equation. The intraparticle diffusion equation proves that the Cr(VI) adsorption is mainly electrostatic, whereas Pb(II) adsorption proceeds via intrapore and electrostatic adsorption on the zeolite surface. This difference in mechanisms endows selectivity of metal ion adsorption by the modified zeolites. This study provides a reference on zeolite modification for use in various applications, such as wastewater treatment.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2017
·
IF 4.421
Bowen Li,Yidi Wang,Fangyuan Tian,Guanshu Li,Zhaohong Zhang,Jun Wang,Youtao Song
In order to expand the light response range of wide band-gap semiconductor photocatalyst (NaTaO 3 ) for effective photocatalytic conversion of Cr(VI), an up-conversion luminescence agent (Er 3+ :YAlO 3 ) is combined with NaTaO 3 and a visible-light driven photocatalyst, NaTaO 3 /Er 3+ :YAlO 3 , is prepared. Moreover, several conduction band co-catalysts (Ag, Au and Pt) are deposited the surface of NaTaO 3 /Er 3+ :YAlO 3 , respectively, to facilitate the transfer rate of photo-generated electrons. X-ray diffractometer (XRD), energy dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM) analyses are employed to confirm the morphology, microstructure and composition of the prepared photocatalysts. In addition, UV–vis diffuse reflectance spectra are determined to explore the visible-light absorption properties of Er 3+ :YAlO 3 , NaTaO 3 , NaTaO 3 /Er 3+ :YAlO 3 and X/NaTaO 3 /Er 3+ :YAlO 3 (X = Ag, Au and Pt). Photoluminescence (PL) spectra are used to estimate the recombination rate of electron–hole pairs. The effects of irradiation time, photosource kind, solution acidity and used times on the photocatalytic capabilities of NaTaO 3 /Er 3+ :YAlO 3 and X/NaTaO 3 /Er 3+ :YAlO 3 (X = Ag, Au and Pt) are investigated in detail. The results show that the uses of up-conversion luminescence agent (Er 3+ :YAlO 3 ) and co-catalysts (Ag, Au and Pt) can promote NaTaO 3 to utilize visible-light to carry out the photocatalytic conversion of Cr(VI). Particularly, the prepared Au/NaTaO 3 /Er 3+ :YAlO 3 nanocomposite with 1.0 wt% Au and 0.3:1.0 molar ratio of Er 3+ :YAlO 3 and NaTaO 3 shows the highest photocatalytic activity in conversion of Cr(VI).
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2016
·
IF 3.782
Rui Zhao,Xiang Li,Bolun Sun,He Ji,Ce Wang
An environmentally benign and efficient hydrothermal carbonization method is widely applied for the preparation of carbon-based adsorbents. However, the adsorption capacity toward anionic species would be influenced due to the negatively charged surface of the traditional hydrothermal carbonaceous materials ; moreover most of the carbonaceous materials were in the form of powder which restricted the practical applications. Herein, amino-rich hydrothermal carbon-coated electrospun polyacrylonitrile fiber (PAN@NC) adsorbents were obtained through one-step hydrothermal carbonization approach assisted by diethylenetriamine using polyacrylonitrile (PAN) fibers as the templates, which showed highly efficient adsorption for anionic pollutants. The PAN@NC fibers were characterized in detail to confirm their structures and composition . The flexible and robust PAN@NC fiber membrane exhibited high adsorption capacity and good regeneration and recycling ability toward the anionic metal ion Cr(VI) and herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). According to the Langmuir model, the adsorption behaviors showed monolayer adsorption capacities of 290.70 mg/g and 164.47 mg/g for Cr(VI) and 2,4- D , respectively, which were higher than that of many other adsorbents. Recycling study indicated that the removal efficiencies for both pollutants retained above 90% after five cycles. These findings demonstrate that PAN@NC fibers are promising adsorbents for the removal of anionic pollutants from wastewater solutions.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Mingchun Bi,Yuning Liang,Weimeng Chi,Hongya Liu,Ying Chen
Nano zero-valent iron (nZVI) is extensively employed in the realm of wastewater treatment. However, conventional synthesis methods involve inherent risks of nZVI oxidation and aggregation, resulting in challenging recovery and potential waste generation. To address these concerns and improve stability, nano zero-valent nickel (nZVNi) was employed as a modifier for nZVI. The modified nZVNi/nZVI was successfully blended with polydopamine (PDA)-modified polyvinylidene fluoride (PVDF) powder, enabling the preparation of a novel hydrophilic composite membrane termed nZVNi/nZVI-PDA@PVDF (NFPP). PDA played a crucial role in effectively immobilizing nZVI particles and preventing their oxidation and aggregation. Scanning electron microscopy was used to confirm the consistent dispersion of nZVNi/nZVI particles both on the surface of the membrane and within its pores. Moreover, the NFPP membrane exhibited excellent performance in removing Cr(VI), with a maximum adsorption capacity of 75.65 mg/g. The presence of PDA endowed the NFPP membrane with a plentiful supply of hydroxyl and amino groups, enhancing its hydrophilicity, antioxidation properties, and loading capacity for nZVNi/nZVI. Additionally, the NFPP membrane demonstrated remarkable resistance to interference under different pH and ionic conditions. The removal of Cr(VI) by the NFPP membrane followed a pseudo-second-order kinetics and Langmuir isotherm adsorption model. Furthermore, the NFPP membrane retained good performance and stability in Cr(VI) removal even after undergoing five cycles. This study indicates that the highly efficient NFPP composite material holds promising potential for application as a functional material in heavy metal wastewater treatment.
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CHEMOSPHERE
·
2024
·
IF 8.1
Jian Liu,Xueren Huang,Zhengji Yi
Complexing agents (CAs) can be used for the removal of Cr(VI) via nanoscale Fe 0 (nZVI) reduction in cost-effective manner. However, nZVI is prone to aggregation and passivation, and some conventional CAs are toxic and difficult to biodegrade, potentially causing secondary pollution. Therefore, selecting an environmentally friendly CA for assisting in the removal of Cr(VI) via supported nZVI is imperative. Herein, NaA molecular sieve membrane-supported nZVI (nZVI/NaA-NF) was prepared via the secondary growth and liquid-phase reduction method using nickel foam (NF) as the carrier. The physicochemical characteristics of nZVI/NaA-NF before and after reaction were analysed via SEM, EDS, and XPS. A CA-improved nZVI/NaA-NF was used for the effective removal of Cr(VI) in a continuous fixed-bed system. Furthermore, the influences of various experimental factors including the CA type, CA concentration, solution pH, space velocity, and inlet Cr(VI) concentration on Cr(VI) removal were systematically investigated. The results demonstrated that nZVI particles were homogeneously immobilized on the NaA molecular sieve membrane/NF for fresh nZVI/NaA-NF, and tetrasodium iminidisuccinate (IDS-4Na) inhibited the aggregation of Cr(III)/Fe(III) (hydr)oxide precipitates during the reaction. IDS-4Na demonstrated excellent promotive effect on Cr(VI) removal via nZVI/NaA-NF. The breakthrough time for Cr(VI) in the addition of IDS-4Na was considerably longer than that of nZVI/NaA-NF alone. The breakthrough concentration of Cr(VI) only reached 1.1% and 9.9% of the inlet concentration at 220 and 240 min, with an IDS-4Na concentration of 4 mM, a pH of 2.5, and a space velocity of 0.265 min −1 . The Bohart–Adams model was appropriate to predict the initial part of Cr(VI) breakthrough curves in the nZVI/NaA-NF fixed bed. The saturated concentration ( N 0 ) increased with an increase in inlet Cr(VI) concentration. The Yoon–Nelson model afforded good fitting results for all breakthrough curves of Cr(VI). The k′ value increased with an increase in space velocity, and the τ value decreased.
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RSC Advances
·
2017
·Vol. 7
·期 76
·48386-48393
·
IF 3.108
Yongming Guo,Yuzhi Chen,Fengpu Cao,Lijuan Wang,Zhuo Wang,Yumin Leng
Nitrogen and boron doped carbon quantum dots (NB-CQDs) with yellow-green emission were prepared via hydrothermal method using 2-hydroxyphenylboronic acid and ethylenediamine in aqueous solution. The as-prepared NB-CQDs exhibited bright yellow-green emission, excellent stability in aqueous solution with high ionic strength and good biocompatibility. We further explored the applications of NB-CQDs for sensing metal ions in aqueous solution. We found that the NB-CQDs could be utilized to sense Cr2O72− in aqueous solution due to the Cr2O72−-induced fluorescence quenching. In the sensing system, as low as 0.5 μM Cr2O72− can be successfully detected and a good linear relationship in the range of 0–250 μM has been obtained. And the NB-CQDs can be also used as ink for writing on paper, revealing the NB-CQDs can be applied for anti-counterfeiting. Moreover, the NB-CQDs exhibit negligible cytotoxicity and good biocompatibility, which is favorable for bioimaging applications. And the NB-CQDs were successfully applied for fluorescence imaging in HeLa cells.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tiantian Li,Zhining Huang,Mengfan Hu,Yuen Hu,Ke Quan,Man Zhou,Yao chen,Shaoju Fu
Heavy metal wastewater pollution has been a globally important and serious issue for the industrial manufacturing center. Herein, we developed a novel CAP@Ui0-66-NH 2 @PPy nanocomposite fibrous membrane, by combining the in-situ growth and oxidative polymerization technical routes, which possessed a high specific surface area and abundant amino-active sites to remove Cr (Ⅵ). Systematic characterization showed that the porous structure and in situ growth of MOF provided sites for polymerization of charged polypyrrole (PPy), resulting in the large specific surface area (78.837 m 2 /g) of CAP2@Ui0-66-NH 2 @10 %PPy. The maximum adsorption capacity was as high as 312.70 mg/g at 298 K, which was significantly better than that of CAP (CA and PVP electrostatic spinning and then washing off the PVP) nanomembranes. The adsorption process was consistent with the proposed secondary kinetic and Langmuir model, and the high adsorption capacity was maintained after five rounds of cyclic adsorptions. Through XPS analysis, the abundant amino groups on the surface of the adsorbent material were protonated, caused the electrostatic attraction and ion-exchange interaction with the anion Cr(Ⅵ). These protonated amino groups were able to reduce the toxic Cr (Ⅵ) to non-toxic Cr (Ⅲ), which was immobilized on the surface of the material through chelation. The MOF lattice achieved in-situ growth on porous CA nanofibrous membranes, which significantly enhances the mass-transfer dynamics and the membrane cycling stability, the amine-based functionalization of the UI0-66-NH 2 improved the coordination activity and increased the adsorption efficiency, and polypyrrole (PPy) conductive layer promoted the directional migration of Cr (VI) and effectively suppressed the interference of competing ions. In sum, the prepared CAP@Ui0-66-NH 2 @PPy hybrid fibrous membranes showing great potentially applicable for heavy-metal wastewater treatment.
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