Desalination and Water Treatment
·
2024
·
IF 1
Shengyan Pu,Miaoting Wang,Kexin Wang,Yaqi Hou,Jing Yu,Qingqing Shi,Xiangjun Pei,Wei Chu
ABSTRACT As an effective and in situ purification strategy, adsorption technology has drawn much attention and recently the utilization of biomass substrate has been regarded as a promising way to enhance the adsorption performance and reduce cost. In this study, chitosan was applied as matrix and the magnetic Fe-crosslinked chitosan (CS-Fe@Fe 3 O 4 ) composite was obtained through a chelation procedure with cheap and environmentally friendly chitosan and iron salts. Then, the resultant CS-Fe@Fe 3 O 4 composites were characterized by scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and thermogravimetric analysis. The sorption and desorption of methyl orange (MO), a common type of azo dye, on CS-Fe@Fe 3 O 4 composite was systematically studied to understand its availability for dyeing wastewater. The results revealed that CS-Fe@Fe 3 O 4 composites could efficiently remove MO in a wide pH range. The mixed Fe 3 O 4 particles were physically mixed andalmost had no negative effect on its adsorption. Moreover, the dye adsorption process was found to be controlled by the pseudo-second-order rate model and the adsorption isotherm behavior could be described by the Langmuir model. The repeatability test showed that the CS-Fe@Fe 3 O 4 composites could retain its high efficiency after desorption and regeneration. In summary, the results presented herein indicated that the resultant CS-Fe@Fe 3 O 4 nanocomposite with high adsorption efficiency and strong magnetic property could serve as a potential adsorbent for remediating industrial dyeing wastewater.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
DOI
高影响因子
BIODEGRADATION
·
2018
·Vol. 29
·期 6
·593-603
·
IF 2.41
Shi Zhoukun,Dong Weiliang,Xin Fengxue,Liu Jiawei,Zhou Xinhai,Xu Fanli,Lv Ziyao,Ma Jiangfeng,Zhang Wenming,Fang Yan,Jiang Min
Abstract An acetamiprid-degrading fungus was isolated from contaminated soil and identified as Fusarium sp. strain CS-3 based on physiological, biochemical, and molecular analyses. Strain CS-3 exploited 50 mg/L as the sole carbon source in liquid culture, removing 98% in 96 h. Strain CS-3 retained its acetamiprid degradation abilities over a wide range of pH (5.0–8.0) and temperature (20–42 °C). HPLC–MS analysis showed that N ′-[(6-chloropyridin-3-yl)methyl]- N -methylacetamide, 2-chloro-5-hydroxymethylpyridine, and 6-chloronicotinic acid were identified as the most predominant metabolites, forming the basis for a newly described acetamiprid degradation pathway. Strain CS-3 efficiently degraded 99.6% of 50 mg/kg acetamiprid in soil, indicating potential for soil remediation. Graphical abstract
研究领域:
环境科学
·
微生物学
·
生物修复
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Zhiguo Wu,Dan Liu,Ying Deng,Runyi Pang,Jinjin Wang,Tian Qin,Zongzheng Yang,Rongliang Qiu
In this research, a new material, chitosan/polypyrrole (CS/PPy), was synthesized and linked with the Cr(VI)-reducing bacterial strain YL3 to treat Cr(VI)-polluted soil. The findings demonstrated that the synergistic application of strain YL3 and CS/PPy achieved the greatest reduction (99.6 %). During the remediation process, CS/PPy served as a mass-storage and sustained release agent in the soil, which initially decreased the toxic effects of high concentrations of Cr(VI) on strain YL3, thereby enhancing the Cr(VI) reduction efficiency of strain YL3. These combined effects significantly mitigated Cr(VI) stress in the soil and restored enzyme activities . Furthermore, wheat growth in the treated soil also significantly improved. High-throughput sequencing of the microorganisms in the treated soil revealed that CS/PPy was not only effective at removing Cr(VI) but also at preserving the original microbial diversity of the soil. This suggests that the combined treatment using strain YL3 and CS/PPy could rehabilitate Cr(VI)-contaminated soil, positioning CS/PPy as a promising composite material for future bioremediation efforts in Cr(VI)-contaminated soils.
研究领域:
环境科学
·
生物技术
·
土壤学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 12
·5007-5016
·
IF 1.6
Wang Weiran,Wang Zhifeng
Modified chitosan-coated nickel ferrite silica nanoparticles were prepared, characterized and experimented for the removal of U(VI). Adsorption amount was 125.30 mg g −1 at pH 5.0. The magnetic chitosan based composite could be successfully recycled from uranium aqueous phase. Finally, calculated data and analysis suggested that the adsorption behaviors of magnetic chitosan based nanoparticles can be explained by pseudo-second order kinetic model ( R 2 = 0.9915), which suggested the adsorption process was probably controlled by chemical adsorption, and langmuir model ( R 2 = 0.9816), which suggested the adsorption process was probably controlled by single-layer adsorption.
研究领域:
环境科学
·
纳米技术
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Senjian Han,Chao Gao,Wenfeng Yan,Yafei Guo,Shiqiang Wang,Tianlong Deng
Radioisotope leaking from nuclear waste has become an intractable problem due to its gamma radiation and strong water solubility. In this work, a novel porous ZnFC-PA/PSF composite sphere was fabricated by immobilization of ferrocyanides modified zinc phytate into polysulfone (PSF) substrate for the treatment of Cs-contaminated water. The maximum adsorption capacity of ZnFC-PA/PSF was 305.38 mg/g, and the removal efficiency of Cs + was reached 94.27% within 2 hr. The ZnFC-PA/PSF presented favorable stability with negligible dissolution loss of Zn 2+ and Fe 2+ (< 2%). The ZnFC-PA/PSF achieved high-selectivity towards Cs + ( K d = 2.24×10 4 mL/g) even in actual geothermal water. The adsorption mechanism was inferred to be the ion-exchange between Cs + and K + . What's more, ZnFC-PA/PSF worked well in the fixed-bed adsorption ( E = 91.92%), indicating the application potential for the hazardous Cs + removal from wastewater.
研究领域:
环境科学
·
材料科学
·
核废料管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 192
·期 1
·1-12
·
IF 5.3
Hou Linqian,Wei Jinya,Xiang Chen,Yang Dezhi,Yang Yaling
A novel copper and iron doped containing chitosan and heparin sodium carbon dots (CS-Cu,Fe/HS) nanozyme was formulated through a single-step microwave digestion method. CS-Cu,Fe/HS exhibits excellent peroxidase (POD)-like activity and positive charge characteristics, and it can oxidize the negatively charged 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) in the presence of H 2 O 2 to produce a green compound (ox-ABTS). Furthermore, CS-Cu,Fe/HS enhances electron transfer and provides additional active sites through the valence state transformations of Fe 2+ /Fe 3+ and Cu 2+ /Cu + . Interestingly, the POD-like activity of CS-Cu,Fe/HS is inhibited with the introduction of ampicillin (AMP), which may be because the Cu and Fe ions in CS-Cu,Fe/HS form complexes with AMP, leading to changes in the structure or surface properties of the nanozyme, thereby reducing the number of active sites on the nanozyme. Drawing from this, a straightforward and reliable colorimetric sensor was constructed for AMP detection, featuring a linear range of 0.033 to 110 μg/mL and a detection limit as low as 11.6 ng/mL. The proposed detection method for AMP performed well in real samples, with recoveries ranging from 94.8% to 110.2%. Graphical abstract
研究领域:
生物化学
·
医学检测
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Yongjing Xu,Bo Liu,Liming Zou,Chenkai Sun,Wengang Li
In order to achieve the electrospinning of chitosan in common organic solvents, amino-reserved CS-g-PCL was synthesized by one-step method. PLLA and dichloromethane/ethanol (CH 2 Cl 2 /EtOH) solvent were chosen to prepare a series of different compositions of PLLA/CS-g-PCL mats (8/2, 6/4, 4/6, 2/8 wt/wt%) by electrospinning. The SEM showed that the smooth defect-free and uniform nanofibers were collected except PLLA/CS-g-PCL 2/8 and pure CS-g-PCL, and the fiber diameter was decreased from 828 nm to 461 nm with the increasing content of CS-g-PCL. The mechanical properties of composite mats have decreased with increasing CS-g-PCL content, but much higher than neat PLLA. The water contact angle, water absorption rate, water-vapor transmission rate and in vitro degradation behavior were 129°–19°, 109%–482%, 1945–2517 g m −2 day −1 and 4–14%, respectively. The addition of CS-g-PCL imparted PLLA/CS-g-PCL electrospun mats on better properties, improving the nature defects of PLLA. The in vitro cell culture studies showed that PLLA/CS-g-PCL 6/4 exhibited a higher in vitro biocompatibility and a better ability for cell attachment, spreading, and proliferation, comparing with PLLA mats. Herein, PLLA/CS-g-PCL 6/4 electrospun mats with excellent performance, was considered the potential application as wound dressing in skin tissue engineering.
研究领域:
生物材料学
·
组织工程学
·
医学材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Zhongjuan Wang,Li-chao Nengzi,Xinyi Zhang,Zhuanjun Zhao,Xiuwen Cheng
In recent years, sulfate radicals-based advanced oxidation process becomes an effective and common technique for elimination of emerging organic contaminants. In this study, novel NiCo 2 S 4 /CS composite was synthesized through hydrothermal method, with the physicochemical properties being characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microcopy (TEM), Brunauer-Emmett-Teller (BET) and Fourier Transform infrared spectroscopy (FT-IR). Then, NiCo 2 S 4 /CS composite acted as catalyst to activate PS for nimesulide degradation. The results showed that NiCo 2 S 4 /CS composite owned the highest activity compared with pure NiCo 2 S 4 and carbon sphere (CS), achieving 92% nimesulide degradation in 10 min with 0.1 g/L catalyst and 0.4 g/L persulfate. Furthermore, the NiCo 2 S 4 /CS membrane was fabricated by vacuum filtration, and 94% and 80% above nimesulide degradation were realized for the first time and after six times repeated experiment, which demonstrated that the catalyst was convenient to achieve recovery and reusability. In addition, the radical quenching experiment, XPS and the electrochemical methods (LSV and EIS) were measured to investigate the possible mechanism pathway, the results of which showed that both the non-radical pathway and radical pathway might attribute to nimesulide degradation, while the SO4 − remained the dominant species. This research provided a novel sulfide NiCo 2 S 4 /CS membrane for the oxidative technique for emerging organic contaminants in water treatment.
研究领域:
环境科学
·
催化材料
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xin Ke,HuiPing Shao,HaiHong Liu,Wengang Liu
In this study, an Fe-La-CS adsorbent with a reticulated structure was prepared by an in situ method, which was able to adsorb arsenate efficiently over a wide pH range of 3–11. The incorporation of iron and lanthanum ions broadened the tolerant pH range of the adsorbent compared with chitosan beads (CS). Arsenic was mainly present in the pH range of 3–9 as two forms, H 2 AsO 4 − and HAsO 4 2− . Calculations using the density-functional theory (DFT) showed that in the Ligand interactions and electrostatic interactions dominate in the pH range, with surface precipitation, and hydrogen bonding interactions playing a facilitating role. The background ions mainly compete with arsenic adsorption for electrostatic interaction sites. However, due to the different valence states of the background ions, the competition intensity is different. Such as low valence state representative ions Na + , K + competitiveness is weak, and arsenic competition adsorption first occupy different adsorption sites, therefore, from the quantum chemistry and molecular dynamics point of view of Na + , K + on arsenic adsorption almost no effect. Cl − , SO4 2− will have some influence on arsenic adsorption because of the same charge with arsenic, but the charged amount is smaller than arsenic and the molecular structure is different from that of arsenic, so the influence is not very big. In summary, the material design of Fe-La-CS adsorbent has great potential and theoretical significance for selective purification of heavy metal wastewater at wide pH.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zhimin Xu,Zhaobin Zhang,Xingfu Zhou
Vertical-oriented Cs-doped rutile TiO 2 nanorod (Cs-TiO 2 NR) arrays were prepared without a seed layer through the hydrothermal method . One-dimension TiO 2 nanorod (TiO 2 NR) arrays not only provide a direct and fast channel for charge transfer but also increase the perovskite loading amount. Further research shows that the conduction band minimum of Cs-TiO 2 NRs increases from − 3.94 eV to − 3.86 eV when compared with the pristine TiO 2 NRs, which favors the positive band alignment at the ETL/perovskite interface and reduces the carrier recombination and energy loss. Furthermore, we simultaneously replaced the expensive and unstable organic hole transport layer and noble metal electrode with a carbon electrode for the purpose of reducing the cost of the PSCs . The study proves that Cs-TiO 2 NRs not only improve the energy level arrangement at the ETL/perovskite interface but also reduce the density of defect states at the interface and increase carrier lifetime. The hole-transport-material-free carbon-based all-inorganic FTO/Cs-TiO 2 NRs/CsPbI 2.25 Br 0.75 /C solar devices exhibited a high-power conversion efficiency (PCE) of 12.72%, showing a 16% increase in PCE when compared with the control device. This work opens the door to the preparation of high-efficiency hole-transport-material-free carbon-based all-inorganic PSCs via the energy level calibration engineering.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Qi Li,Senlin Deng,Junyang Liu,Tingting Yan,Jinguo Hao,Gang Wang,Guoliang Zhang,Jie Li,Chunshan Li
The dispersion of active sites plays an imperative role in the promotion of catalytic performance on methyl acrylate synthesis via direct vaporous aldol condensation. Herein, a novel PEG-assisted impregnation method was proposed to synthesize Cs/Zr-SiO 2 catalyst with high dispersion of acid and base sites. A series of characterization techniques including NMR, TEM, physical N 2 adsorption isotherms, XRD, XPS, NH 3 -/CO 2 -TPD, and Py-IR were used to investigate the physico-chemical properties of these prepared catalyst series. The introduction of PEG improved the specific surface area, dispersion of active sites, and density of acid and base sites, resulting in superior catalytic performance of Cs/PEG@Zr-SiO 2 by comparison with that of Cs/SiO 2 and Cs/Zr-SiO 2 . The kinetic experiments revealed that the activation energy of aldol condensation was 80.8 kJ/mol over the Cs/PEG@Zr-SiO 2 catalyst. The deactivation behavior derived from carbon deposition was discovered, and the spent catalyst could be regenerated by simple thermal treatment.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jingxuan Zhao,Hongxu Liu,Yuchao Qi,Ruijia Wang,Ziwei Lv,Yang Yu,Shulin Sun,Yiming Wang
In this work CS-SDAEM polymer brushes with long-chain structure were synthesized, and TiO 2 /CS-SDAEM nanoparticles were prepared by modifying them on the TiO 2 surface. The prepared modified membrane can effectively degrade dyes through photocatalysis and can reduce the contamination rate of the membrane during use. The separation membrane achieves efficient removal of contamination by self-cleaning. The results of the membrane surface analysis test show that the formation of coordination bonds between o-benzenetriol of GA and TiO 2 , and the chemical reaction between CS and GA, which promote the stability between coating components. The results of filtering tests show that with the excellent anti-fouling performance of long-chain polymer brush, the photodegradability of TiO 2 and a large number of hydrophilic groups contained in GA and CS, PVDF- TiO 2 /CS-SDAEM membranes overcome the above shortcomings and achieve super-hydrophilicity, anti-fouling and self-cleaning. In addition, DFT model simulations of photocatalytic processes show that there is a charge transfer between CS and TiO 2 , which increases the width of the high light absorption band and improves the efficiency of photodegradation. Modified membranes achieve efficient self-cleaning processes and low flux decline rates, which hold great promise for use in real wastewater application scenarios.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）