Polymers
·
2022
·Vol. 14
·期 17
·3573
·
IF 4.967
Ruidan Liu,Xiaoyan Liu,Heng Yang,Handuo Jie,Tianyu Li,Kai Lyu,Surendra P. Shah
The lamellar structure of graphene oxide and the filling effect of nano-cerium oxide particles together provide a good barrier and stability to coating. In this paper, cerium oxide-graphene oxide (4:1) nanocomposite was prepared by the hydrothermal synthesis method. The effect of cerium oxide–graphene oxide (4:1) nanocomposite on the anticorrosion properties of epoxy coating in simulated acid rain solution was studied by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), Mott–Schottky curve, Tafel curve, and micromorphological characterization, in order to compare it with pure epoxy coating, graphene oxide epoxy coating, and cerium oxide epoxy coating. The obtained results showed that cerium oxide–graphene oxide (4:1) epoxy coating’s protection efficiency was as high as 98.62%. These results indicated that cerium oxide–graphene oxide modified anticorrosive coating had an excellent application prospect in an acid rain environment. Meanwhile, owing to the poor protection ability of epoxy resin and unstably hydrolysis product of CeO2to the acidic medium, the resistance of CeO2–GO (4:1)/EP coating to acidic corrosive medium was relatively poorer than that of neutral and saline-alkali corrosive medium.Keywords:CeO2;nanocomposite;electrochemistry;EIS;acid rain
研究领域:
材料科学
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环境科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2020
·
IF 6.793
Zhiyan Huang,Lu Jiang,Pingxiao Wu,Zhi Dang,Nengwu Zhu,Zehua Liu,Hanjin Luo
For further understanding leaching characteristics of heavy metals in tailings and better immobilization on heavy metals against acid rain, batch experiments were conducted. The leaching results of Cu(II), Zn(II), Cd(II) and Mn(II) can be well fit by second-order kinetics equation , and Pb(II) can be well fit by two-constant equation. The leaching intensity of heavy metals in tailings was ranged as: Mn(II)> Cu(II)> Cd(II)> Zn(II)> Pb(II). Triethylenetetramine functioned montmorillonite (TETA-Mt) was successfully synthesized and can obtain simultaneous immobilization effect compared with Mt and TETA, and immobilization rates on Cu(II), Cd(II), Mn(II) and Zn(II) can reach above 90%, the immobilization rate on Pb(II) can reach more than 75%. The mechanisms for efficient immobilization of heavy metals on TETA-Mt included buffering and adsorption abilities. The mechanism for TETA-Mt adsorption of heavy metals included physical absorption, chelation and chemical sedimentation. The results showed that TETA-Mt can be applied to effective immobilization of heavy metals in tailings and efficient remediation of acid mine drainage (AMD) in acid rain area.
研究领域:
环境科学
·
土壤修复
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Ping Zhang,Zhuoheng Tu,Zhihao Yan,Xiaomin Zhang,Xingbang Hu,Youting Wu
SO 2 is a major atmospheric pollutant leading to acid rain and smog. As a new generation of green solvents, deep eutectic solvents (DESs) have been widely investigated for gas capture. Nevertheless, studies on DES-based membranes for SO 2 separation are yet minimal. Herein, we devised polymer/DES blended membranes comprising 1-butyl-3-methyl-imidazolium bromide ([Bmim]Br)/diethylene glycol (DEG) DES and poly (vinylidene fluoride) (PVDF), and these membranes were firstly used for selective separation of SO 2 from N 2 and CO 2 . The permeability of SO 2 reaches up to 17480 Barrer (0.20 bar, 40 ºC) in PVDF/DES blended membrane containing 50 wt% of [Bmim]Br/DEG (2:1), with ultrahigh SO 2 /N 2 and SO 2 /CO 2 selectivity of 3690 and 211 obtained, respectively, far exceeding those in the state-of-the-art membranes reported in literature. The highly-reversible multi-site interaction between SO 2 and [Bmim]Br/DEG DES was revealed by spectroscopic analysis . Furthermore, the PVDF/DES blended membrane was also able to efficiently and stably separate SO 2 /CO 2 /N 2 (2.5/15/82.5%) mixed gas for at least 100 h. This work demonstrates for the first time that [Bmim]Br-based DESs are very efficient media for membrane separation of SO 2 . The easy preparation, low cost and high performance enable polymer/DES blended membranes to be promising candidates for flue gas desulfurization .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACTA PHYSIOLOGIAE PLANTARUM
·
2021
·Vol. 43
·期 12
·1-11
·
IF 2.354
Shu Xiao,Zhang KeRong,Zhang QuanFa,Wang WeiBo
Acid rain remains a global environmental issue that can indirectly impact plant root growth and health by mediating soil acidification. The impact of acid rain on the roots of Jatropha curcas L., however, has not been thoroughly evaluated to date in soils with a range of buffering capacities. We, therefore, explored the ability of J. curcas roots to tolerate acid rain in a range of soil types by exposing samples to simulated acid rain (SAR) (pH2.5, pH3.5, pH4.5, pH5.6) and then examining the impact of such exposure on root morphology, relative growth rate (RGR root ), nutrient absorption, enzymatic activity, and microbial biomass. Yellow–brown soil (YBS) and purple soil (PS) were found to be better able to buffer SAR-mediated acidification, thereby providing superior benefits to J. curcas root growth as compared to red soil (RS) and yellow soil (YS) under these experimental conditions. SAR (pH 4.5) significantly enhanced Ca, K, and Mg absorption by J. curcas roots, thereby improving their growth characteristics, whereas SAR (pH 2.5) impaired K and Mg absorption and thus suppressed root growth. K and Mg absorption characteristics were regulated by changes in plasma membrane H + -ATPase activity under these different SAR treatment conditions. Morphological and growth (RGR root ) adaptations of J. curcas roots to SAR treatment were associated with superoxide dismutase activity levels therein. SAR (pH 4.5) was sufficient to bolster the rhizosphere microbial activity of J. curcas seedlings, and correlation analyses revealed that root growth was regulated by rhizosphere microbial biomass P content under SAR treatment conditions.
研究领域:
植物学
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 57
·86651-86664
·
IF 5.19
Li Caidan,Wang Jing,Jiang Yue,Bai Yilin,Cheng Liu
Pollution of municipal sewage sludge with heavy metals (HMs) inevitably causes secondary contamination, threatening ecosystems and human health. Dissolved organic matters (DOM) would serve as HMs carriers or ligands, directly influencing the transport and distribution. So it is of essential importance to simultaneously evaluate the release characteristics of HMs and DOM from MSS. In this paper, we investigated leaching characteristics of HMs (Cd, Cr, Cu, Zn, Ni, and Mn) and DOM from raw sewage sludge (RSS) and lime-conditioned sewage sludge (LCSS) under simulated rain with different acidities (pH 6.5 and 2.9) via column leaching experiments. The results showed the release of HMs could be divided into two distinct stages, a rapid decreasing changes in the early stage and a slow and steady change in the later stages with a slight increase in the middle of time. At the early stage, DOM was dominated by protein-like components (tryptophan-like, tyrosine-like). As time passed, protein-like components decreased while humic-like components (fulvic acid and humic acid) increased gradually. Protein-like components showed significant positive correlations with HMs, while humic acid-like components showed strong negative correlations with them. Moreover, the leaching efficiencies of Cd, Zn and Mn at pH 2.9 was about 1.5 times higher than that at 6.5, and the fluorescence intensity of humic-like components at pH 2.9 was higher than that at pH 6.5, suggesting that acid rain accelerated the release of HMs and the humification of DOM. Compared with the RSS, the DOM of LCSS showed noticeable differences, especially an obvious increase of the fulvic acid component. And the leaching efficiencies of Cd, Cr, Cu, Ni, and Mn in LCSS were much lower than that in RSS, indicating lime treatment retarded the release of HMs. Thus, our findings will be a guide to the treatment of HMs contaminants in MSS.
研究领域:
环境科学
·
环境工程
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土壤污染
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水体生态毒理学
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固废处理
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Zhendong Liu,Longguan Zhu,Bingjian Zhang
The surface weathering of open-air limestone caused by long-term acid-rain erosion and thermal stress is an urgent issue to solve. In this study, seven concentrations of diammonium phosphate and aluminum chloride hexahydrate (fixed molar ratio of 1000:1) were used to generate aluminum phosphate protective materials in situ with high lattice matching with calcite for surface consolidation. The compatibility test, mechanical property evaluation, and protective mechanism of the material were elucidated by color change, porosity, permeability, surface hardness, infinite compressive strength, Fourier-transform infrared spectroscopy, and scanning electron microscopy–energy-dispersive X-ray spectroscopy. It was found that aluminum phosphate had good aesthetic compatibility and water–vapor exchange balance with the matrix and surrounding environment. Meanwhile, the surface coating grown by crystal accumulation could play a role in filling pores and agglomerated particles, thereby improving the hardness (83.5 HD), infinite compressive strength (4.05 MPa), and acid-rain erosion resistance of the limestone weathering layer. Aluminum phosphate can play a vital role in the treatment and prevention of limestone surface-weathering diseases and has high research value and broad application prospects.
研究领域:
材料科学
·
文物保护
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 6
·2721-2744
·
IF 3.134
Song Ruiming,Li Zhimei,Li Wanli,An Ya,Li Mei,Qin Haoli,Liu Chengshuai
Clay adsorbents are considered an inexpensive and readily available solution for removing heavy metals, including cadmium, from the environment to reduce pollution. In this study, thiol-modified bentonite (SH-Bent) was prepared by grafting cysteamine hydrochloride onto natural bentonite (Bent). The effects of pH, equilibrium contact time, and temperature on the adsorption–desorption behavior of Cd 2+ were studied, and adsorption isotherm models were applied to examine the adsorption behavior of SH-bent. SH-Bent demonstrated better performance and stability for Cd 2+ adsorption than Bent. SH-Bent exhibited an enhanced adsorption capacity for Cd 2+ at equilibrium of 49.3 mg/g at pH 6, 120 min, and 303 K, which was 42-fold higher than that of Bent under the same conditions. An investigation of the desorption behavior of Cd 2+ adsorbed on Bent and SH-Bent in simulated acid rain revealed that SH-Bent has high stability, with a desorption rate of 5.73% at pH 4.5, 60 min, and 303 K, which was much lower than that demonstrated by Bent under the same conditions (45.68%). The Langmuir equation was the best-fitted adsorption isotherm model, closely followed by the Freundlich, Tempkin, and Dubinin–Radushkevich models. A significant difference in diffusion was observed between the two types of clay according to the intraparticle diffusion model. The adsorption–desorption processes of SH-Bent and Bent fit the pseudo-second-order model best among the five kinetic models examined. The information provided in this study can be used to apply thiol-modified clay for wastewater treatment or for the removal of cadmium from soil. Graphical abstract
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guifang Wang,Guangchuan Liang,Huizhen Xiao,Jun Qiu,Haiyan Liu,Shaojian Ma,Sridhar Komarneni
The conventional environmental remediation materials, which are applied for the long-term treatment of mine tailings are easy to fail when affected by acid rain. Therefore, dynamic column simulation experiments were conducted to compare the immobilization persistence of As, Mn, Pb and Zn by the addition of triethylenetetramine modified montmorillonite (TTA-Mt) and calcium-based montmorillonite (Ca-Mt) in sulfide tailings during a simulated 5-year study of acid rain leaching. The structural and morphological characteristics of TTA-Mt were analyzed with FTIR, XRD, SEM, TEM and EDS. Results showed that the additions of TTA-Mt could persistently immobilize the heavy metal ions while Ca-Mt additions had little effect. After long-term simulated leaching for 5 years, TTA-Mt still had superior environmental stability for Zn and As with the immobilization rates of 96% and 86%, and the leaching amounts of Mn and Pb were less than 4.23 and 0.66 mg/kg, respectively. Morphology and chemical fraction analyses confirmed that the immobilization was mainly due to the formation of relatively stable phases by complexation and precipitation. Results presented here demonstrated the significant potential of TTA-Mt for long-term immobilization of heavy metals in tailings against acid rain and thus could provide guidance for remediation of tailings.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 8
·1-16
·
IF 3.8
Deng Wenchao,Wang Guanghui,Wang Bing,Deng Nansheng
The contamination of soil with cadmium (Cd) poses a significant risk to both food safety and human health. It is crucial to urgently identify an effective technology for remediating Cd-contaminated soil. In the present study, a novel sulfur modified biochar supported ferrous sulfide (FeS@SBC) composite was fabricated by calcination and hydrothermal method. Indoor culture, column leaching, and pot experiments were employed to examine the immobilization effect of FeS@SBC on Cd in contaminated soil. The outcomes illustrated a significant immobilization effect on the Cd-contaminated soil with the application of FeS@SBC. After incubating the soil with the stabilizer for 28 d, the Cd that was previously highly mobile underwent a transformation into an immobilized state. In the experiment on leaching using simulated acid rain, the treatment with FeS@SBC showed a noteworthy decrease in the cumulative loss and leaching efficiency of Cd when compared to the control experiment. It achieved reductions of 70.9% and 71.6%, respectively. The adsorption and immobilization mechanisms resulted from co-precipitation, ion exchange and surface complexation. In the outdoor pot experiment, after 28 d of growth, the water spinach in contaminated soil treated with FeS@SBC has a better growth compared to the control group, with a biomass increase of 134.95%. Additionally, the values of BCF and TF of Cd decreased by 62.25% and 40.39%, respectively, and the available concentration of Cd in the soil decreased by 23.87%. The FeS@SBC composite shows promise as an effective stabilizer for remediating Cd-contaminated soil.
研究领域:
环境科学
·
土壤修复
·
重金属污染治理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Beini Gong,Pingxiao Wu,Zhujian Huang,Yuanyuan Li,Shanshan Yang,Zhi Dang,Bo Ruan,Chunxi Kang
The potential application of triethylenetetramine intercalated montmorillonite (TETA-Mt) in mine tailings treatment and AMD (acid mine drainage) remediation was investigated with batch experiments. The structural and morphological characteristics of TETA-Mt were analyzed with XRD, FTIR, DTG-TG and SEM. The inhibition efficiencies of TETA-Mt against heavy metal release from mine tailings when exposed to acid rain leaching was examined and compared with that of triethylenetetramine (TETA) and Mt. Results showed that the overall inhibition by TETA-Mt surpassed that by TETA or Mt for various heavy metal ions over an acid rain pH range of 3–5.6 and a temperature range of 25–40 °C. When mine tailings were exposed to acid rain of pH 4.8 (the average rain pH of the mining site where the mine tailings were from), TETA-Mt achieved an inhibition efficiency of over 90% for Cu 2+ , Zn 2+ , Cd 2+ and Mn 2+ release, and 70% for Pb 2+ at 25 °C. It was shown that TETA-Mt has a strong buffering capacity. Moreover, TETA-Mt was able to adsorb heavy metal ions and the adsorption process was fast, suggesting that coordination was mainly responsible. These results showed the potential of TETA-Mt in AMD mitigation, especially in acid rain affected mining area.
研究领域:
环境地球化学
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环境污染与修复
·
矿物材料学
·
环境工程
·
土壤化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Ningning Bai,Qing Li,Hongzhou Dong,Cui Tan,Peng Cai,Lan Xu
Self-recovering superhydrophobic coatings (SHCs) have drawn much attention in recent years because of their unique self-recovering properties and potential industrial applications. In this study, self-recovering SHCs based on recovery of structural damage have been successfully fabricated by spraying the mixture of polymethylmethacrylate/zinc stearate/stearic acid. The SHCs display a static contact angle (CA) of 158°, a sliding angle (SA) of 1° and exhibit a rough structure as shown in the SEM images. By acid rain (pH ≈ 3.5) scouring, the coatings maintain CA of 134° and high adhesion due to the broken morphology. Interestingly, the coatings restored superhydrophobicity after immersion in water for several minutes. Furthermore, the SHCs exhibit good long-term stability, water-durability and UV-durability, adapting to out-door environment. Above all, the coatings are environmental, low cost and can be quickly coated on various large-scale substrates, which will widen their practical applications.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Yanghong Liu,Yunzhen Chang,Ying Zhang,Yanping Li,Wenjing Hou,Sheng Zhu,Kan Hang,Gaoyi Han
The conservation of sandstone cultural relics has gained increasing attention due to their scarcity, historical and cultural value. However, they exhibit a vulnerability that must endure degradation caused by prolonged outdoor exposure, particularly the hazards caused by water infiltration. Herein, we have designed and developed a hydrophobic composite coating for safeguarding outdoor-exposed sandstone relics. The coating has integrated the silica nanoparticles modified by perfluorodecyl triethoxysilane (FAS-17) with fluorinated resin and polymethyl methacrylate (PMMA) to achieve waterproofing for outdoor-exposed sandstone. The protective effect of the coating has been systematically evaluated through water contact angle (WCA) measurements under various environmental tolerances such as acid rain resistance, mechanical bearing capacity, and adaptability for wide temperature range adaptability (-20 ℃ and 80 ℃). The tested results demonstrate that the coating on sandstone shows superhydrophobic ability and stability. For example, the coating exhibits exceptional hydrophobicity (WCA > 150°) and self-cleaning properties after various accelerated aging cycles such as under acidic rain, mechanical peeling, sand impact, high and low temperature environments. Importantly, the coating on sandstone can preserve the inherent permeability of sandstone substrates while providing robust interfacial adhesion. These outcomes highlight the potential of the FAS-SiO 2 based composite coating as a durable and compatible coating for mitigating outdoor environment-induced deterioration in sandstone cultural heritage conservation.
研究领域:
文化遗产保护
·
材料科学
·
表面工程
·
环境科学
·
纳米技术
✓ 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）