Journal of Cleaner Production
·
2022
·
IF 11.072
Kaini Yang,Xiangyu Wang,Yan Yi,Jun Ma,Ping Ning
The current technologies for production of nanoparticle-membrane are apt to involve complicated multi-step process and/or toxic chemicals and other defects. This study provides a green and clean cryogel manufacture method for fabrication of hydrophilicity Polyacrylonitrile (PAN) membrane with highly porous structure for supporting nano zero-valent iron (NZVI) via a surface modification by employing biodegradable lactic acid. Non-toxic natural compound, glutathione (GSH) was adopted not only as modifiers but also as chelators to promote the capture capacity of hexavalent chromium (Cr(VI)). The specific surface area of the prepared composite (GLPN, 193.16 m 2 /g) was larger than the previously studied NZVI-membrane (PPN, 131.61 m 2 /g), and NZVI was distributed uniformly and not agglomerated on the membrane. Compared with NZVI, the efficiency of GLPN removed Cr(VI) has increased by 39.80%. At low pH and Cr(VI) initial concentration, GLPN can completely remove Cr(VI) when the GSH concentration is increased to 50 mM, and the removal efficiency can still reach 86.96% after 6 regenerations. Visual MINTEQ model and experimental results show that the mechanism of GLPN removing Cr(VI) includes the synergy of electrostatic adsorption, chelation, reduction and co-precipitation. The process conforms to two-parameter nonlinear dynamics and Redlich-Peterson isotherm model. This novel strategy shows that GLPN has excellent stability, reducibility and green reproducibility, and can efficiently remove and recycle heavy metal in the natural water matrices or wastewater.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Cheng Yu,Xiaoxi Zhu,Abdelkader Mohamed,Ke Dai,Peng Cai,Shilin Liu,Qiaoyun Huang,Baoshan Xing
Biochar can act as a shuttle to accelerate the extracellular electron transfer (EET) by exoelectrogens. However, it is poorly understood how the persistent free radicals (PFRs) in biochar affected EET and the redox reaction. Herein, the effects of the biochar and chitosan modified biochar (CBC) on the Cr(VI) bioreduction by Shewanella oneidensis MR-1 (MR-1) was investigated. Kinetic study indicated that the Cr(VI) bioreduction rate constant by MR-1 was increased by 1.8–33.7 folds in the presence of biochar, and by 2.7–60.2 folds in the presence of CBC, respectively. Moreover, Cr(VI) bioreduction rates increased with the decreasing pH. Results suggested that the electrostatic attraction between Cr(VI) and redox-active particles could accelerate the EET by c -cytochrome due to the promotion of the Cr(VI) migration from aqueous phase to biochar or CBC. Electron paramagnetic resonance analysis suggested that the PFRs affected the electron transfer from the ·O 2 - generated by MR-1 to Cr(VI) and accelerate the Cr(VI) bioreduction. Remarkably, in the presence of PFRs, this electron shuttling process was dependent on the non-metal-reducing respiratory pathway. Our results offer new insights that free radicals may be widely involved in the EET and strongly impact on the redox reaction in the environment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Junlin Xie,Kun Wei,Xiaoqing Liu,De Fang
Carbon powders were used to detoxify [Cr(VI)] in metallurgical solid waste was investigated, since the presence of [Cr(VI)] had a very serious impact on the environment. Five types of carbon powders were selected as carbon sources and soluble CrO 3 was used as a hexavalent chromium source in metallurgical solid waste. Ultra-fine Cr 3 C 2 powders (about 80 nm) were synthesized by carbothermal reduction reaction to achieve the detoxification of [Cr(VI)]. The temperature plays a crucial role in the synthesis of Cr 3 C 2 according the experimental and thermodynamic results, illustrating that the synthesis temperature was in the range of 900 ℃–1200 ℃. Surface area, morphology, and surface chemistry of carbon powders were investigated to analyze the effect of carbon type on the mechanism of detoxification of hexavalent chromium [Cr(VI)] and the formation of chromium carbide . The results show that nano carbon powder with finer particle size (30–50 nm), higher specific surface area (101.5 m 2 /g) and fewer chemical bonds with carbon atoms formed by sp 2 orbital hybridization are more suitable as a carbon source for carbothermal reduction of [Cr(VI)]. Therefore, nano Cr 3 C 2 powder was achieved at the lowest synthesis temperature (900 ℃), when nano carbon powder was selected as the carbon source.
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 50
·76404-76416
·
IF 5.19
Hu Jie,Lu Songhua,Ma Jianfeng,Zhu Fang,Komarneni Sridhar
In this paper, the g-C 3 N 4 /ZnIn 2 S 4 composite was synthesized by a two-stage hydrothermal method. The microstructure, surface, and optical properties of the composite were thoroughly characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) surface area analysis, and UV-Vis absorption spectroscopic analysis. The removal capacity of Cr(VI) was optimized by using ZnIn 2 S 4 loaded in the composite. Meanwhile, the optimal pH environment for the reduction of Cr(VI) was determined to be about pH 3, and the reduction efficiency could reach more than 99% within 60 min. Further, the results of UV-Vis absorption analysis indicated the high and wide range of light absorption by composite compared with pure g-C 3 N 4 . Therefore, the enhanced photocatalytic performance of the composite could be attributed to the well-matched energy band structure between g-C 3 N 4 and ZnIn 2 S 4 , which apparently promoted the effective separation and transfer of photogenerated carriers. In addition, the composite showed good stability in the visible light catalytic reaction, and the possible mechanism of the photocatalytic activity of Cr(VI) reduction by the composite was proposed.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 14
·4909
·
IF 3.748
Yunquan Liu,Huimei Shan,Chunya Zeng,Hongbin Zhan,Yanyue Pang
Graphene oxide and chitosan microspheres modified with α–FeO(OH) (α–FeO(OH)/GOCS) are prepared and utilized to investigate the performance and mechanism for Cr(VI) removal from aqueous solutions and the possibility of Fe secondary pollution. Batch experiments were carried out to identify the effects of pH, mass, and volume ratio (m/v), coexisting ions, time (t), temperature (T), and Cr(VI) initial concentration (C0) on Cr(VI) removal, and to evaluate adsorption kinetics, equilibrium isotherm, and thermodynamics, as well as the possibility of Fe secondary pollution. The results showed that Cr(VI) adsorption increased withC0,t, andTbut decreased with increasing pH andm/v. Coexisting ions inhibited Cr(VI) adsorption, and this inhibition increased with increasing concentration. The influence degrees of anions and cations on the Cr(VI) adsorption in descending order were SO42−> PO42−> NO3−> Cl−and Ca2+> Mg2+> Mn2+, respectively. The equilibrium adsorption capacity of Cr(VI) was the highest at 24.16 mg/g, and the removal rate was 97.69% under pH = 3,m/v= 1.0 g/L,T= 298.15 K, andC0= 25 mg/L. Cr(VI) adsorption was well fitted to a pseudo-second-order kinetic model and was spontaneous and endothermic. The best fit of Cr(VI) adsorption with the Langmuir and Sips models indicated that it was a monolayer and heterogeneous adsorption. The fitted maximum adsorption capacity was 63.19 mg/g using the Sips model under 308.15 K. Cr(VI) removal mainly included electrostatic attraction between Cr(VI) oxyanions with surface Fe–OH2+, and the adsorbed Cr(VI) was partially reduced to Cr(III) and then precipitated on the surface. In addition, there was no Fe secondary pollution during Cr(VI) adsorption.Keywords:hydroxyl iron oxide;graphene oxide;chitosan;Cr(VI) adsorption
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Tao Xian,Hongqin Li,Xiaofeng Sun,Yashan Huo,Lijing Di,Chenyang Sun,Hua Yang
The In2O3 nanoparticles were homogeneously attached on the BiOBr nanoplate surface to obtain S-scheme In2O3/BiOBr heterojunction photocatalysts by a hydrothermal route. The purity, crystal structure, chemical state, morphology, light absorption property, and photogenerated charge behavior of composites were investigated by XRD, SEM, TEM, HRTEM, XPS, UV–vis DRS, PL, ESR, and electrochemical tests. The removal of dyes (acid orange 7 (AO7), acid orange 10 (AO10), and rhodamine B (RhB)) and Cr(VI) was employed to evaluate the photocatalytic performance of In2O3/BiOBr composites irradiated by simulated sunlight. The results indicate that the photocatalytic performance of BiOBr can be remarkably promoted after the decoration of In2O3 nanoparticles, and the best photocatalytic activity was achieved over an 8% In2O3/BiOBr sample. The 8% In2O3/BiOBr sample also indicates outstanding synergistic photocatalytic performance for the removal of the heavy metal ion/dye mixture (AO7/Cr(VI) and RhB/Cr(VI)). It is found that the decoration of In2O3 nanoparticles can accelerate the transfer and separation of photoinduced electrons and holes in BiOBr nanoplates. The energy band structure, work function, and Fermi level of BiOBr and In2O3 were computed through the density functional theory calculation. Based on the above investigation, the photocatalytic mechanism of the S-scheme In2O3/BiOBr composite was discussed.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2022
·Vol. 32
·期 6
·2343-2350
·
IF 2.525
Liu Tao,Zhang Shuai,Fan Xiaoyu,Yang Dou,Wang Min,Shao Xiaodong,Wang Shuhao,Yue Qiaoli
Carbon dots (CDs) were used to develop a sensitive sensing technique for detecting Cr(VI). CDs were made using a hydrothermal technique from citric acid and glutamic acid. These prepared CDs emitted blue fluorescence under excitation of 350 nm (λ em = 420 nm), and the fluorescence quantum yield was 48.41%. Transmission electron microscope was used to examine the morphology of the CDs, which had an average size of 2.21 ± 0.39 nm. The elementary composition and bonding structure of the CDs were conducted by XPS and FT-IR spectrum. Cr(VI) quenched the fluorescence of CDs through a static quenching effect and an inner filter effect, allowing Cr(VI) to be detected quantitatively. This approach was used to detect Cr(VI) in two samples of water, with the findings demonstrating that it is reliable and accurate. The fluorescence intensity change was linearly related to the concentration of Cr(VI) in the range from 0.5 to 400 μM, with the detection limit being 0.10 μM. This approach has the virtues of wide detection range, low cost and fast response. The strategy has a great application prospect for detecting Cr(VI) in practical samples.
✓ 已验证
DOI
PubMed
高影响因子
Small
·
2022
·Vol. 18
·期 35
·2201949
·
IF 15.153
Xiaoning Li,Meng Li,Quanyu Shi,Hongmin Guo,Lidong Wang,Xiaolin Guo,Zhijun Chen,Jonathan L. Sessler,Huining Xiao,Tony D. James
Heavy metal pollution has resulted in numerous environmental challenges. However, classic approaches, involving the use of solid adsorbents are subject to limitations, including the high energy consumption required for processing before and after use. Accordingly, strategies that facilitate the use of metal capture media that extends beyond waste remediation are attractive. Herein, a porous fluorescent aerogel (CPC aerogel) is constructed by immersing amino-based carbon dots (CDs-NH 2 ) into a polyethyleneimine (PEI)/carboxymethylated cellulose (CMC) aerogel network for the simultaneous detection and adsorption of Cr(VI). Adsorption experiments confirm that the CMC/PEI containing CDs-NH 2 aerogel (CPC aerogel) exhibits good Cr(VI) extraction capacity, and can reach a level that conforms with industrial water safety standards. In addition, the CPC aerogel can continuously detect and remove Cr(VI) at high flux. Following Cr(VI) absorption, the CPC aerogel may be vulcanized (MS x -CPC gel) and used for solar thermoelectric generation resulting in power generation. Additionally, the MS x -CPC gel can be used for solar steam generation and exhibits excellent evaporation rates of ≈1.31 kg m –2 h –1 under one sun irradiation. The results serve to underscore how materials designed for metal ion recognition and adsorption once exhausted can be exploited to provide materials for solar thermoelectric power generation and seawater desalination.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2021
·Vol. 11
·期 1
·1-9
·
IF 4.38
Zhang Shujie,Zhang Yating,Fu Lisong,Jing Mengke
The application shell uses cellulose as a green and recyclable fiber material, which has great value in the field of water treatment environment. Varying factors, including pH value, dosage of CS, reaction time and original Cr(VI) ions and Cu(II) ions were studied to investigate the Cr(VI) and Cu(II) ions removal efficiency. The obtained shell trichlorocellulose has better permeability to copper ions, which is mainly due to the different oxide states of copper ions and chromium ions in a pH environment, which lead to different combinations. The price of shell cellulose neutralization is relatively low. Metal ions have better absorption properties. The kinetic and thermodynamic characteristics of the adsorption process of copper ions by chitosan yarns were discussed. The adsorption process of copper ions conformed to the quasi-second-order kinetic equation. It can be fitted by Langmuir isotherm. The adsorption of copper ions by the yarn is a spontaneous thermal reaction with both physical adsorption and chemical adsorption. Compared with chromium ions, chitosan fibers have better adsorption of copper ions, which is mainly because the amino groups in chitosan fibers can have good chelation with copper ions. SEM, FTIR, XRD were used to characterize the adsorption of copper ions by chitosan fibers, and the mechanism of the adsorption of metal ions by chitosan fibers was explored.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Yueting Liao,Yaohai Zhang,Qiyang Zhao,Wei Xiang,Bining Jiao,Xuesu Su
Metal organic framework MIL-101(Cr) was successfully synthesized as a selective adsorbent by a facile self-assembly technique and combined with UPLC-MS/MS for enrichment and determination of neonicotinoids in fruit juices and tea beverages. Therein, MIL-101(Cr) was characterized by Fourier transform infrared spectrometry, scanning electron microscopy, X-ray diffraction, and N 2 adsorption–desorption isotherms. Box-Behnken design was applied to optimize the significant variables including the sorbent amount, pH of the matrix, eluant volume, extraction time and desorption time. The optimized conditions were sorbent amount of 20 mg, eluent volume of 1 mL, extraction time of 5 min and desorption time of 4 min. Under the optimized conditions, excellent sensitivity was achieved with the limit of detection of 0.0019–0.02 μg/L and limit of quantification of 0.0063–0.067 μg/L. Good linearity (R 2 ≥ 0.9988) was obtained within the range of 1–1000 μg/L, and the recovery was 71.04%-101.64% with relative standard deviations (RSDs) of 1.25%-8.82% in spiked samples. The inter- and intra-day RSDs were both<8.54%. The adsorption isotherms investigated for acetamiprid, thiacloprid, and imidacloprid pesticides better fitted with the Freundich adsorption isotherm with bimolecular adsorption capacity of 71.43, 68.49, and 50.38 mg/g, respectively. These results indicate that the nanocomposite is feasible for adsorption of the target analytes at trace amounts from fruit juices and tea beverages.
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2021
·Vol. 11
·期 1
·1-15
·
IF 4.38
Eltaweil Abdelazeem S.,El-Monaem Eman M. Abd,Mohy-Eldin Mohamed S.,Omer Ahmed M.
An efficient composite was constructed based on aminated chitosan (NH 2 Cs), attapulgite (ATP) clay and magnetic Fe 3 O 4 for adsorptive removal of Cr(VI) ions. The as-fabricated ATP@Fe 3 O 4 -NH 2 Cs composite was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Thermal Gravimetric Analyzer (TGA), Scanning Electron Microscope (SEM), Zeta potential (ZP), Vibrating Sample Magnetometer (VSM), Brunauer–Emmett–Teller method (BET) and X-ray photoelectron spectroscope (XPS). A significant improve in the adsorption profile was established at pH 2 in the order of ATP@Fe 3 O 4 -NH 2 Cs(1:3) > ATP@Fe 3 O 4 -NH 2 Cs(1:1) > ATP@Fe 3 O 4 -NH 2 Cs(3:1) > Fe 3 O 4 -NH 2 Cs > ATP. The maximum removal (%) of Cr(VI) exceeded 94% within a short equilibrium time of 60 min. The adsorption process obeyed the pseudo 2nd order and followed the Langmuir isotherm model with a maximum monolayer adsorption capacity of 294.12 mg/g. In addition, thermodynamics studies elucidated that the adsorption process was spontaneous, randomness and endothermic process. Interestingly, the developed adsorbent retained respectable adsorption properties with acceptable removal efficiency exceeded 58% after ten sequential cycles of reuse. Besides, the results hypothesize that the adsorption process occurs via electrostatic interactions, reduction of Cr(VI) to Cr(III) and ion-exchanging. These findings substantiate that the ATP@Fe 3 O 4 -NH 2 Cs composite could be effectively applied as a reusable adsorbent for removing of Cr(VI) ions from aqueous solutions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Ju Liu,Dandan Hao,Huiwen Sun,Yu Li,Jianlin Han,Bo Fu,Jiancheng Zhou
In this Article, a hybrid foam was fabricated through the integration of amine-functionalized Fe-MOF (MIL-101-NH2) into cellulosic matrix. The existence of enormous group linkages and ionic bonding interactions among the composite foam network leads to a uniform dispersion of MIL-101-NH2 and high affinity between the MOF and cellulose skeleton. As-prepared hybrid foams were utilized as photocatalysts to reduce toxic hexavalent chromium ions (Cr(VI)) under visible light. Optimal performance was observed over CM-1 (with a MIL-101-NH2 and nanocellulose mass ratio of 1:1). When compared to pure MOF nanoparticle counterparts, the CM-1 foam presented preferable and more efficient Cr(VI) removal performance. The reasons could be attributed to the hierarchal pore structure and uniform MOF loading. Moreover, the flexible foams could be easily separated from the solution and preserved more than 80% removal efficiency of Cr(VI) after 10 runs. This work would shed light on how to construct high-efficiency photocatalysts for environmental governance from sustainable materials.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）