Journal of Water Process Engineering
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2024
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IF 6.3
Jinfeng Zhao,Yuntong Fan,Jiaqi Zhangle,Congcong Ni
Perfluorooctanoic acid (PFOA) is a persistent organic pollutant found in various industrial effluents, posing significant environmental and health risks. Electrosorption of PFOA on MXene-polyaniline film from water was studied. The results of electrosorption kinetics showed that the functionalized MXene film with polyaniline resulting in an approximately 100 % increase in electrosorption capacitance for PFOA due to increasing of the MXene film's volumetric capacitance and modifying of surface chemistry of MXene. The maximum adsorption of PFOA on MXene and MXene-polyaniline films were 358.5 mg/g and 966.1 mg/g, respectively, at an initial concentration of 100 mg/L upon application of +1.0 V. Moreover, humic acid (HA) competing with the adsorption sites, sodium chloride through the double-layer compression effect, and pH affecting the amine or amide functional groups on MXene-polyaniline which inhibited PFOA adsorption onto MXene-polyaniline film were thoroughly examined. Lastly, the reversible adsorption–desorption cycles show that the MXene–polyaniline film possesses the potential to be used continuously. To address PFAS pollution in water sources, we think our approach can help build effective and long-lasting technology.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2024
·Vol. 89
·期 4
·873-886
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IF 2.5
Tao Haiyan,Cao Xiaochang,Song Rujie,Zhou Zebin,Cheng Fang
A membrane-aerated biofilm reactor (MABR) combines membrane technology with biofilm processes and has unique advantages in the treatment of organic wastewater and volatile wastewater. The common membranes for MABR systems usually have relatively uneven pore structures and low bubble point pressure, resulting in unsatisfactory O 2 utilization and wastewater treatment efficiency. In this work, polydimethylsiloxane (PDMS) and UiO-66 (a Zr-based metal organic framework) were coated on the surface of a commercial polypropylene (PP) hollow fiber membrane to prepare oxygen-rich MABR membranes and modules, which showed an attractive O 2 utilization rate and wastewater treatment efficiency. The bubble points of the PDMS and PDMS-UiO-66 membranes were significantly higher than those of the PP membranes, and the PDMS-UiO-66 membranes had better oxygen enrichment capacity and biological affinity. The optimal PDMS-UiO-66 membrane modules had an O 2 permeance of 31.65 GPU (1 GPU = 3.35 × 10 −10 mol m −2 s −1 Pa −1 ), with O 2 /N 2 selectivity of 2.21. The membrane hanging effect and processing capacity for domestic sewage were greatly improved. This study may provide insights and guidelines to fabricate porous mixed matrix membranes and modules in the industry for MABR. The developed products are expected to be applied in the actual separation process. PDMS and PDMS-UiO-66 were coated on the PP support to prepare O 2 -rich MABR membranes and modules. With UiO-66 loading, the module has a higher O 2 /N 2 separation performance, a rougher and more hydrophilic membrane surface. The PDMS-UiO-66 membrane module exhibits a good biofilm hanging effect and high NH 4 + -N removal performance.
研究领域:
环境科学
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材料科学
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生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 32
·期 1
·015706
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IF 3.551
Qiao Yin,Zhenzhen Cao,Zhiyuan Wang,Jiaming Zhai,Mingliang Li,Li Guan,Bingbing Fan,Wen Liu,Gang Shao,Hongliang Xu,Hailong Wang,Rui Zhang,Hongxia Lu
Photocatalytic degradation of pollutants has been proved to be an effective strategy for wastewater treatment. Herein, TiO2 nanoparticles were synthesized on a Ti3C2 matrix by in situ growth, forming Z-scheme TiO2@Ti3C2/Cd0.5Zn0.5S (TO/CZS) multilevel structured nanocomposites via one-step hydrothermal route. The effects of hydrothermal temperature and Cd0.5Zn0.5S content on microstructure and properties of composites were assessed. TO/CZS nanocomposites were probed into phase composition, morphological and optical properties with x-ray diffractometer, infrared radiation, scanning electron microscope and UV–vis reflective spectra. Following the hydrothermal reaction at 160 °C for 12 h, TiO2 nanoparticles of 30 nm in diameter were generated in situ on Ti3C2 lamina and Cd0.5Zn0.5S particles were evenly distributed on the Ti3C2 matrix. The photocatalytic activity of TO/CZS composites were evaluated, which found that degradation rate constant (k = 0.028 min−1) of TO/CZS-40 on Rhodamine B was 5.19 times that of pure TiO2 and 4.48 times that of Cd0.5Zn0.5S. Through anchoring Ti3C2 as an electron transition mediator and combination with TiO2 and Cd0.5Zn0.5S, the new Z-scheme between TiO2 oxidized by Ti3C2 and Cd0.5Zn0.5S establishes a multilevel structure of separating electron-hole pairs. This work demonstrates a valid way to control electrons and hole transfer directions efficiently through designing multilevel semiconductor structural designs.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Materials Today Communications
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2024
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IF 3.7
Chunlong Qiu,Haiyang Sun,Yeyang Ni,Zhenjiang Dou,Ming Xia,Zhaoyang Fei,Zhuxiu Zhang,Mifen Cui,Qing Liu,Xu Qiao
The impressive water stability demonstrated by MIL-101(Cr) highlights its considerable potential for the effective elimination of organic contaminants from wastewater. Nevertheless, the limited availability of adsorption sites within MOFs leads to an unsatisfactory capacity for tetracycline (TC) adsorption. In this case, the lanthanum modified MIL-101(Cr) porous adsorbents, termed as nLa-MIL-101(Cr), were successfully synthesized using a post-synthetic modification method. Through various characterization analyses, it was confirmed that lanthanum exists in the form of La(OH) 3 within the adsorbents, and all adsorbents also preserved the original structure as MIL-101(Cr). The results of static adsorption experiments demonstrated that, compared to the original material, the adsorption capacity of 1La-MIL-101(Cr) for TC increased by 3.5 times. Further experiments demonstrated that the adsorbent exhibits remarkable ion interference resistance and cycle stability. Finally, based on X-ray photoelectron spectroscopy, the adsorption mechanism was primarily attributed to the coordination between TC molecules and metals active site, while electrostatic interactions also played a significant role in the process. This study has developed a highly efficient adsorbent for the treatment of TC-contaminated wastewater, which reflects promising practical application prospects.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Hao Wang,Zixuan Zeng,Ran Duan,Hua Sheng,Chao Shan,Wenjing Song,Jincai Zhao
Organic phosphonates are recalcitrant contaminants in industrial and municipal wastewater. Their oxidative conversion to phosphate is promising for the in-depth removal and recovery of phosphorus. However, the treatment by conventional advanced oxidation processes (AOPs) usually demonstrates no precedence toward phosphonates, suffering from severe interference from co-existing substances and the overuse of costly oxidants. Herein we develop a copper-directed protocol for highly selective oxidation of phosphonates driven by simulated solar irradiation. Exploiting copper nanostructures decorated bismuth vanadate, hydroxyethylidene diphosphonic acid (HEDP), a representative phosphonate, converted to phosphate at > 93 % yield in two hours. Distinguished from Fe/UV or copper-free light-driven oxidation that is susceptible to common anions/organic matters, the protocol developed here offered excellent anti-interference performance, and was applicable for oxidative removal of HEDP in actual water matrices, maintaining 70–80 % yield of phosphate. Copper-promoted oxidation was also demonstrated for PBTC (2-phosphonobutane-1,2,4-tricarboxylic acid), EDTMP (ethylenediamine tetra (methylene phosphonic acid)) and DTPMP (diethylenetriamine penta (methylene phosphonic acid)). Other than free radical mediated process, the copper enhanced phosphonate-catalyst interaction enables directional interfacial hole transfer to phosphonates, triggering their conversion to phosphate. The revealed selective oxidation pathway is envisioned to guide new protocol design for advanced treatment of phosphorus-containing wastewater.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Yiwen Wang,Shuanglin Gui,Qinliang Jiang,Pei Han,Hong Wang,Jianping Deng,Tao Chen,Jianxin Li
As the rare earth industry develops and energy efficiency improves, high-salinity rare earth smelting wastewater poses a significant environmental concern. This study applied integrated ultrafiltration (UF) - nanofiltration (NF) membrane technology to treat high-salt rare earth smelting wastewater (Ca 2 ⁺: 10.75 g/L, COD: 3.5 g/L, turbidity: 1.36 NTU) for salt removal and recovery. The effects of UF pretreatment were explored, and the operating parameters for NF were optimized, with the performance of various commercial NF membranes being evaluated. Membrane fouling conditions were also investigated to determine appropriate cleaning methods. The experimental results demonstrate that the UF-NF integrated process is effective in actual wastewater treatment. The calcium ion content in the permeate was reduced from 10.75 g/L in the feed solution to 0.96 g/L, achieving a removal rate of 91.1 %, which meets reuse water standards. Trace amounts of organic molecules in the water, such as 2-Ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507), were also effectively removed. The removal rates for COD and TOC were notably high at 97.7 % and 98.3 %, respectively. Acid washing, alkaline washing, and water washing were employed to clean the membranes, all of which achieved flux recovery rates exceeding 95.0 %. In summary, the integrated UF-NF process demonstrated outstanding performance in salt recovery/separation of different valence salts from rare earth smelting wastewater. Its excellent operational stability and high flux recovery rates highlight its strong industrial applicability. The exceptional treatment efficacy it displays provides a feasible technological pathway for resource recovery and water recycling in practical applications.
研究领域:
环境工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Mingzhi Lv,Yaoxing Liu,Jie Jiang,Rui Lian,Hun Xue,Riyao Chen,Rui Ding,Jianxi Liu
With the development of industrial civilization, large amounts of wastewater containing boron and zinc are being produced. Such wastewater poses a great threat to human health if discharged without treatment. In this study, an integrated technology of electrodialytic metathesis (EDM) and a hydrothermal process was utilized to recover boron and zinc from wastewater in the form of zinc borate (Zn 2 B 6 O 11 ·3H 2 O). Experimental results showed that electrolyte concentration , current density , and initial boron and zinc concentration clearly affected the recovery ratios for B 4 O 7 2− and Zn 2+ and their corresponding specific energy consumption and current efficiencies . Under the optimal experimental conditions (an electrolyte concentration of 1.0 mol/L in the recycling compartment in the experimental setup, a current density of 15 mA/cm 2 , initial ZnSO 4 and Na 2 B 4 O 7 concentrations of 0.1 mol/L, and a flow rate of 20 mL/min), the recovery ratio, specific energy consumption, and current efficiency were 85.6 %, 6.5 kW·h/mol, and 12.3 %, respectively, for recovering B 4 O 7 2− and 80.6 %, 1.7 kW·h/mol, and 45.7 %, respectively, for recovering Zn 2+ . When one recovery compartment was employed, the current efficiencies for recovering B 4 O 7 2− and Zn 2+ were 12.3 % and 45.7 %, respectively, and these values were 11.4 % and 43.8 %, respectively, when two recovery compartment were used. After B 4 O 7 2− and Zn 2+ concentrated by EDM were treated via a hydrothermal process, a white precipitate was produced. The results of X-ray diffraction, Fourier transform infrared spectroscopy , and thermogravimetric analyses showed that this precipitate exhibited physicochemical properties similar to those of commercial Zn 2 B 6 O 11 ·3H 2 O. Thus, the integrated technology can be regarded as an effective method for recovering boron and zinc from wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Long Zhou,Na Li,Xiaoying Jin,Gary Owens,Zuliang Chen
A n Fe@ZIF-8 composite, which combined the tailorable porosity of ZIF-8 with the versatile functionality of Fe nanoparticles ( n Fe), was synthesized for Pb(II) removal. Batch adsorption experiments showed that more than 95.3% of Pb(II) was removed from aqueous solution at an initial concentration of 50 mg L −1 when using n Fe@ZIF-8 within 60 min at pH value of 5. The mechanism of Pb(II) removal was studied via characterization of changes the morphology, size and composition of in n Fe@ZIF-8 before and after exposure the solutions containing Pb(II). Specifically, Fourier transform infrared (FTIR) and X-ray powder diffraction (XRD) indicated that n Fe@ZIF-8 was successfully synthesized and also remained stable after Pb(II) removal. Transmission Electron Microscope (TEM) and Scanning electron microscopy-X-ray energy dispersive spectrometer (SEM-EDS) both confirmed that Pb(II) was partially adhered onto the surface of n Fe@ZIF-8, where X-ray photoelectron spectroscopy (XPS) specifically revealed the existence of Pb(0) on the surface. This indicated that Pb(II) was initially adsorbed onto the surface of n Fe@ZIF-8 and subsequently reduced to Pb(0). Moreover, Pb(II) removal fit well to kinetics of absorption and reduction. Finally, in practice, n Fe@ZIF-8 could remove 96.3% of Pb(II) from an electroplating wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2024
·
IF 1.5
Gao Kai,Shi Yunfeng,An Kexin,Tan Jun,Zhang Yanna,Dong Jiajie,Yu Weiyue,Lin Haipeng
A hydrothermal method which can convert free cesium ions into stable pollucite at low temperatures was established in this work, avoiding any evaporation pollution during the disposal of cesium containing waste. Meanwhile, rapid synthesis under hydrothermal conditions was achieved using seed guidance, which shorten the growth time of pollucite crystals to 8 h, and making the treatment and disposal of cesium containing wastewater faster. Standard leaching test results show that the leaching rate of Cs was very low (< 3.5 × 10 −7 g·m 2 ·d), it still has good thermal stability at a temperature of 1300 °C, when the cesium content in pollucite reaches 20%.
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 Environmental Chemical Engineering
·
2025
·
IF 7.2
Guowei Chen,Minghui Qiu,Wei Ke,Xianfu Chen,Yiqun Fan
Membrane technology is an efficient approach for separation of polyvinyl alcohol (PVA)-starch desizing wastewater. However, fouling caused by complex components remains a challenge in industrial-scale applications, leading to reduced flux and frequent chemical cleaning. Here, we utilize PVA components in wastewater to form a self-forming dynamic membrane (SFDM) on substrate surface during filtration, thereby improving the anti-fouling properties of the ceramic membrane as well as its retention performance for small molecule starches generated through decomposition in a high temperature and strong alkali system. We investigated the effects of pore sizes in porous ceramic on starch separation performance and dynamic membrane formation in the simulation system of PVA-starch. In an industrial desizing wastewater treatment system, we verify the stability and reproducibility of SFDM technology. The results demonstrate that ceramic membranes with a pore size of 20 nm are conducive to forming complete SFDMs, resulting in an increase in starch retention from 75.6 % to 99.9 %, while maintaining flux at 59 L·m −2 ·h −1 . The removal rates of COD, TOC and turbidity are 76.2 %, 68.3 % and 99.9 %. SFDMs can form quickly and reduce irreversible fouling on ceramic membranes. The use of ceramic-supported PVA SFDM provides valuable insights for applying ultrafiltration technology to complex wastewater.
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
MINERALS ENGINEERING
·
2024
·
IF 4.9
Guihong Han,Aohua Li,Yizhuang Wang,Hu Sun,Yanfang Huang,Bingbing Liu
The mining of strategic U-Mo deposits invariably leads to the generation of wastewater with significant risks of radioactive and heavy metal pollution. This study explores a novel process for the simultaneous precipitation-adsorption of U and Mo from mine drainage, with subsequent solidification of the radioactive Fe(OH) 3 sediments using tailings. The results demonstrate that, under specific conditions, such as 33.6 mg/L Fe 3+ and pH 6.0–7.0, more than 97 % of U and Mo can be efficiently co-removed, and the treated water exhibits a gross α radioactivity of less than 0.2 Bq/L. The U-bearing Fe(OH) 3 sediments are transformed into general solid wastes, exhibiting low α radioactivity of less than 1.0 Bq/kg for 238 U, 232 Th or 226 Ra, after being blended with tailings in a mass ratio of 1:50. The reaction, adsorption and solidification mechanisms are further elucidated. The U and Mo are primarily precipitated and adsorbed in the forms of UO 2 (OH) 2 and Fe 2 (MoO 4 ) 3 respectively. The U-bearing Fe(OH) 3 particles are firmly encapsulated by negatively charged particles of phlogopite, quartz, and orthoclase, and agglomerate into large particles within the solidification product, thereby reducing U dissolution in simulated acid rain. Ultimately, a sustainable treatment flowsheet is established for the management of U-Mo ore mine drainage and tailings.
研究领域:
环境科学
·
放射化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Yu Liu,Ruiqi Fu,Yue Sun,Xiaoxin Zhou,Shams Ali Baig,Xinhua Xu
In this study, EDTA-functionalized Fe 3 O 4 (Fe 3 O 4 @SiO 2 -EDTA) was prepared by silanization reaction between N-(trimethoxysilylpropyl) ethylenediamine triacetic acid (EDTA-silane) and hydroxyl groups for Pb(II) and Cu(II) removal from aqueous solutions. Fe 3 O 4 @SiO 2 -EDTA composites were characterized using SEM, TEM, EDX, FTIR, XPS, TGA and saturated magnetization techniques. Maximum Pb(II) adsorption capacity was found to be 114.94 mg g −1 with SiO 2 /EDTA molar ratio of 2.5:1. The adsorption rate was significantly fast and the equilibrium was reached within 10 min. The optimum pH was recorded to be 5.0. The maximum adsorption capacity of the studied heavy metal ions calculated by Langmuir model followed the order: Cu(II) (0.58 mmol g −1 ) > Pb(II) (0.55 mmol g −1 ) ≈ Ni(II) (0.55 mmol g −1 ) > Cd(II) (0.45 mmol g −1 ). Moreover, Pb(II) and Cu(II) adsorption capacities were not significantly affected by co-existing cations and NOM. These results suggested that this adsorbent can be considered as a promising adsorbent to remove Pb(II) and Cu(II) from wastewaters.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）