CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Zhili Li,Junyi Chen,Yuanyuan Ge
Water contamination is one of the most serious problems afflicting people throughout the world, innovation of nanomaterials with eco-friendliness is important for a greener environment. Here, an eco-friendly nanocomposite based on lignin grafted carbon nanotubes (L-CNTs) is reported as a new type of adsorbent for water remediation. By integrating the tridimensional structure, oxygen-containing functional groups and eco-friendliness of lignin with the high surface area and mechanical stability of CNTs, the as-prepared nanocomposite not only possesses a good water-dispersibility and eco-friendliness, but also exhibits an excellent adsorption capability for lead ion and oil droplet. It shows a high distribution coefficient for lead ion ( K d = 3.6 × 10 5 mL/g) that is comparable to some benchmark materials, including mesoporous carbon and metal-organic frameworks. The large surface area and tridimensional structure also endows L-CNTs with a high removal efficiency for oil droplet from water. Moreover, the cost of the nanocomposite has been minimized by incorporation of the low cost lignin. These results demonstrate the as-obtained nanocomposite with a natural polymer layer has advanced adsorption capability, low-in cost and eco-friendliness, and accordingly is an ideal candidate for water cleanup.
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
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Yuliang Tu,Dongye Zhao,Yanyan Gong,Zhiliang Li,Hong Deng,Xueming Liu
Soil contamination by heavy metals and metalloids has been a major environmental challenge. While various remediation technologies have been reported, field data on the remediation effectiveness have been limited. We tested a new remediation technology for on-site immobilization of As(III) and Pb(II) in a contaminated soil at an abandoned chemical plant site. A novel ternary amending agent consisting of Fe 2 O 3 , MnO 2 , and Mg(OH) 2 (molar ratio = 1.0:5.5:5.5) was used to amend the soil on-site . Field monitoring data indicated that the amendment severed as a pH buffer and a long-term sequester for both As and Pb in the soil. At a dosage of 3 wt%, the acid-leachable As and Pb were lowered from 0.042–0.077 mg/L and 0.013–0.022 mg/L to 0.0062–0.0093 mg/L and 0.0030–0.0080 mg/L, respectively, after one day of the amendment, and to 0.0020–0.0050 mg/L and 0.0020–0.0054 mg/L after 240 days of aging. As(III) was oxidized to As(V) and subsequently immobilized via complexation and precipitation, whereas Pb(II) was sequestered via electrostatic attraction and chemical precipitation . The treatment cost was estimated at $31.5/m 3 . The results indicate that complex contaminants in soil can be effectively immobilized using combined amending agents that can interact with the target chemicals and induce synergistic immobilization reactions.
研究领域:
环境科学
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土壤修复
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
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IF 6.551
Jinfeng Tang,Minhua Su,Lezhang Wei,Yongjun Wei,Jiawei Liang,Yingkui Liu,Yue Luo
Municipal solid waste incineration (MSWI) fly ash generally contains substantial toxic elements which can be easily released into the environment, giving rise to serious environmental contaminations. In order to dispose of these harmful fly ashes safely and feasibly, an advanced and reliable strategy is needed. This work presented an integrated method designed for recycling of valuable copper (Cu) and zinc (Zn) through hydrochloric acid leaching and sequential extraction (using LIX 860N-I and Cyanex 572 for Cu and Zn as extractants, respectively) and clean-up of cadmium (Cd) and lead (Pb) in consequential waste effluent by adsorption with a versatile material – bundle-like hydroxyapatite (B-HAP). The method was applied in the pilot scale tests with recovery yields of 95% and 61% for Cu and Zn, respectively. Additionally, satisfied removal efficiencies of Cd and Pb (over 95% for both) were realized, reaching the acceptable emission level for Cd and Pb in China. A scenario based on the latest MSW data in 2018 in Guangzhou was assessed through the integrated pilot experiment. The evaluation demonstrates a reduction of a $ 20.8 million cost; over 48.2 k GJ of energy consumption and 5800 tons of CO 2 emission can be reduced in 2018, comparing to that landfilled in hazardous waste sites, which reveals great benefits. The valuable metal recovery in combination with decontamination of toxic elements/substances as a complete and combined process gives a promising fly ash treatment strategy in future.
研究领域:
环境科学
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冶金工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jiajun Ma,Donghai Zhang,Fei Ying,Xiongjie Li,Ling Li,Shun Guo,Yu Huan,Ji Zhang,Jing Wang,Shan-Tao Zhang
Dielectric capacitors have attracted growing attention because of their important applications in advanced high power and/or pulsed power electronic devices. Nevertheless, the synergistic enhancement of recoverable energy storage density (Wrec > 10 J/cm3) and efficiency (η > 80%) is still a great challenge for lead-free dielectric bulk ceramics. Herein, by introducing complex perovskite compound (Bi0.9Na0.1)(Fe0.8Ti0.2)O3 with a smaller tolerance factor into an NaNbO3 matrix (NN-BNFT), we have achieved and explored stable relaxor antiferroelectric ceramics with enhanced relaxor behavior. Of particular importance is the composition of 0.88NN-0.12BNFT, which exhibits a large electric breakdown strength Eb of 87.3 kV/mm, an ultrahigh Wrec of 12.7 J/cm3, and a high efficiency η of 82.5%, as well as excellent thermal reliability and an ultrafast discharge speed, resulting from the dense microstructure, the moderate dielectric constant, the reduced grain size, the dielectric loss, and the sample thickness. The outstanding energy storage properties of NN-BNFT display great promise in advanced dielectric capacitors for energy storage applications.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 11
·6282
·
IF 6.208
Weikai Ding,Yousef Sultan,Shumei Li,Wenjun Wen,Bangjun Zhang,Yiyi Feng,Junguo Ma,Xiaoyu Li
Previous studies have indicated that the harmful heavy metal lead (Pb) contamination in aquatic systems has caused intelligence development disorders and nervous system function abnormalities in juveniles due to the increased permeability of the blood–brain barrier. Ionic liquids (ILs) are considered “green” organic solvents that can replace traditional organic solvents. Studies have found the presence of ILs in soil and water due to chemical applications or unintentional leakage. Therefore, what would happen if Pb interacted with ILs in a body of water? Could ILs enable Pb to more easily cross the blood–brain barrier? Therefore, we examined the combined exposure of Pb and ILs in common carp at low concentration (18.3 mg L−1of Pb(CH3COO)2•3 H2O and 11 mg L−1of the IL 1-methyl-3-octylimidazolium chloride, 5% of their LC50) for 28 days in the present study. The result of a neurobehavioral assay showed that chronic exposure of lead at lower concentrations significantly altered fish movement and neurobehaviors, indicating that lead exposure caused neurotoxicity in the carp. Increases in the neurotransmitter dopamine levels and injuries in the fish brain accounted for neurobehavioral abnormalities induced by lead exposure. Moreover, we also found that lead could easily cross the blood–brain barrier and caused significant bioaccumulation in the brain. Particularly, our study indicated that the ionic liquid could not synergistically promote blood–brain barrier permeability and hence failed to increase the absorption of lead in the fish brain, suggesting that the combined exposure of lead and ILs was not a synergistic effect but antagonism to the neurotoxicity. The results of this study suggested that ILs could recede the Pb induced neurotoxicity in fish.Keywords:Cyprinus carpio;Pb;ionic liquid;combined exposure;neurotoxicity
研究领域:
水生毒理学
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环境科学
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神经科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2022
·
IF 8.91
Jiequan Liu,Ruyi Zhou,Junxia Yu,Li Guo,Xiaodi Li,Chunqiao Xiao,Haobo Hou,Ruan Chi,Guoqing Feng
Potentially toxic elements including lead (Pb), manganese (Mn), and copper (Cu) released from copper tailings would cause severe long-term environmental risks and potential threats to human health. To prevent these negative effects caused by the release of the metals, a novel magnetic carboxyl groups modified bagasse with high adsorption affinity and strong magnetism was synthesized through an in-situ precipitation method and used to simultaneously remove Pb, Mn, and Cu from the eluate of copper tailings. Results showed that release of Pb, Mn, and Cu from the copper tailings was pH, time, and particle size dependent, and maximum concentrations of them released in the eluate was 1.7, 1.9, and 4.1 mg L −1 under weak acid conditions. Batch adsorption experiment showed that the as-synthesized magnetic modified bagasse could selectively absorb Pb, Mn, and Cu from a complex solution with adsorption capacity of 137.3, 13.1, and 90.0 mg g −1 , respectively. X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy-mapping (EDS-mapping) demonstrated that Pb, Mn, and Cu interacted with the magnetic modified biosorbent mainly through coordination and ion exchange. Column experiments showed that higher than 99.5% of the released Pb, Mn, and Cu could be simultaneously removed by the magnetic modified bagasse, and the maximum concentrations of them released in the eluate of the copper tailings were all decreased to lower than 0.01 mg L −1 , which reached the discharge standards. After recycled by a magnet, the magnetic modified bagasse could be collected easily and used repeatedly. Because of the high efficiency and easy recovery, the used method had great practical application value in removal of potentially toxic elements released from metallic tailings.
研究领域:
环境科学
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生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 23
·8259
·
IF 4.927
Ping Gao,Suwen Cheng,Jiaxin Liu,Junjie Li,Yanyan Guo,Zhengtao Deng,Tianshi Qin,Aifei Wang
Lead-free all-inorganic halide materials with different Mn2+-based crystal structures (Cs3MnBr5and CsMnBr3) were obtained using a convenient synthetic method. Cs3MnBr5had a bright green emission (522 nm), with a unique single-exponential lifetime (τavg= 236 µs) and a high photoluminescence quantum yield (82 ± 5%). A red emission was observed in the case of the CsMnBr3structure with a two-exponential fluorescence decay curve, and the lifetime was 1.418 µs (93%) and 18.328 µs (7%), respectively. By a judicious tuning of the synthetic conditions, a mixed phase of Cs3MnBr5/CsMnBr3was also produced that emitted white light, covering almost the entire visible spectrum. White-light-emitting diodes (WLEDs) with color coordinates (0.4269, 0.4955), a color temperature of (3773 K), and a color rendering index (68) were then fabricated using the as-prepared powder of mixed phases of Cs3MnBr5/CsMnBr3with a commercial UV LED chip (365 nm).Keywords:perovskite;Cs3MnBr5;manganese halide;phosphor;white LEDs
研究领域:
材料科学
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光学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 7
·9032-9043
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IF 2.478
Liu Yunyi,Pan Yongqi,Bai Xudong,Wang Jinchuan,He Caiwang,Xu Zunping,Chen Yi
A conventional ceramic preparation method was used to fabricate the newly designed ternary (K,Na)NbO 3 -based lead-free ceramics, which have the general formula of (0.97- x )K 0.40 Na 0.60 Nb 0.95 Sb 0.05 O 3 –0.03Bi 0.5 K 0.5 HfO 3 – x SrZrO 3 . An X-ray diffraction analysis, together with dielectric-temperature measurements, was performed for determining their phase structures. The crystal structure was found to transition from a rhombohedral-orthogonal phase coexistence to a three-phase coexistence of rhombohedral-orthogonal-tetragonal phases with the increase in SrZrO 3 concentration, and then to a rhombohedral-tetragonal phase coexistence, and finally to a single rhombohedral phase. Near the three-phase coexistence zone, the ceramics exhibit an obviously enhanced electrical activity, with an electromechanical coupling coefficient k p = 0.364 and a piezoelectric constant d 33 = 280 pC/N. Through a microstructure analysis, a slightly excessive amount of SrZrO 3 was found to result in an inhibition for the grain growth of the studied ceramics. These results show that incorporating SrZrO 3 into ternary (K,Na)NbO 3 -based ceramics is still an effective means of constructing phase boundaries and improving the electromechanical properties.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
Exposure and Health
·
2021
·Vol. 14
·期 2
·253-262
·
IF 11.422
Ren Guofeng,Ma Liangji,Ding Ping,Jin Jing,Yang Xiandan,Ju Zhao,Huang Ruixue
Heavy metals in industrial areas threaten local resident health through multiple routes, in particular the contaminated food. Traditional glutinous rice wine (GRW) is a popular drink in China. However, the toxic metal pollution status of GRW remains unclear. In this study, we aimed to compare intake level and the effects of GRW on health risk among residents between industrial area and commercial area in the central of China. The results indicated the mean concentrations of lead (Pb), cadmium (Cd) and arsenic (As) of all GRW samples in industrial area were 0.78, 0.13 and 0.09 mg/L which had exceeded both of Chinese glutinous rice wine detection standard (DB46/T 120-2008) and National standard of Food safety (GB2762-2017), whereas the lead (Pb), cadmium (Cd) and arsenic (As)concentrations were normal in the commercial area. Health risk assessment showed industrial area had a higher risk of non-cancer health diseases via intake of lead (Pb), Cd and As in the order: Cd > lead (Pb) > As. The total hazard index (HI) in industrial area was 4.580 whereas in commercial area the HI was 0.491, respectively. Further, in the industrial area, the cancer risk (CR) of lead (Pb) was 9.523 × 10 –6 and Cd was 6.53 × 10 –2 , whereas in commercial area, the CR of lead (Pb) was 1.286 × 10 –6 and Cd was 2.60 × 10 –3 . The principal components analysis (PCA) and cluster analysis further identified high concentration of lead (Pb), Cd and As in the industrial area is due to industrial-related activities. Our findings emphasize the importance of following consumer advice with respect to GRW and urgent action should be taken to reduce the detrimental health effects to the industrial residents.
研究领域:
环境科学
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公共卫生
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2023
·Vol. 13
·期 2
·250
·
IF 2.9
Hui Ge,Zhigang Pan,Feng Xie,Diankun Lu,Wei Wang,Shulin Wu
The jarosite residue is a harmful byproduct of the zinc hydrometallurgical process and has been classified as hazardous waste due to its high content of heavy metals and poor stability. In this work, the recovery of valuable metals by synergistic disposal of jarosite residue with cement kiln has been investigated. A series of investigations were undertaken to assess the effect of amount of jarosite residue, roasting time, and the addition of CaCl2on phase transformation and migration of valuable elements in the cement clinker. When 25% of jarosite residue was added to the raw cement materials and roasted at 1400 °C for 30 min, the silicate content in the cement clinker reached 54.4%. In the presence of CaCl2as the mineralizer, the volatilization rates of Pb and Zn were 93% and 75%, respectively. The results indicated that jarosite residue can be used as the cement additive and valuable metals of Pb and Zn can be recovered simultaneously during the roasting process.Keywords:jarosite residue;cement;Pb and Zn;synergistic roasting
研究领域:
环境科学
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冶金工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Boyu Du,Yumeng Wang,Qian Zheng,Xing Wang,Xiaohong Chen,Jinghui Zhou,Guihua Yang,Run-Cang Sun
The development of eco-friendliness and cost-effectiveness featured lignin-based adsorbents is of great interest for the removal of organic dyes and heavy metal ions. In this work, lignin was modified by 5-sulfosalicylic acid using epichlorohydrin and formaldehyde as across-linking agents. Then the prepared lignin product (C-SAL) was applied as an adsorbent for the malachite green (MG) and Pb 2+ ions, and the adsorption performances were investigated in detail via a series of experiments. The isotherm and kinetic models indicated that the chem-adsorption for both MG and Pb 2+ ions occurred in monolayer, and the thermodynamic models displayed that all processes were endothermic and spontaneous. Based on the calculation, the maximum adsorption capacities (Q max ) of C-SAL could achieve 203.45 and 115.67 mg/g for MG and Pb 2+ ions, respectively, which are superior to many other biomass-based adsorbents. Besides, 94.52 % and 88.27 % of initial adsorption capacities could be retained after eight cycles for MG and Pb 2+ ions, respectively. Additionally, the adsorption mechanism was also comprehensively investigated by the structural change characterizations, MESP analysis and DFT calculations. The results showed that the adsorption for MG molecules took place through electrostatic, hydrogen bonding and π-π interactions, while that for Pb 2+ ions was attributed to the synergistic effect of complexation, hydrogen bonding and electrostatic interactions. In summary, C-SAL has the advantages of satisfied adsorption capacity and good recyclability, which can provide a low-cost and high-efficiency way for adsorptions of pollutants in practical applications.
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
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chunlong Zhao,Lu Peng,Zongsheng Li,Bo Chen,Tao Zhou,Youcai Zhao
During the high-temperature treatment process of municipal solid waste incineration (MSWI) fly ash (FA), heavy metals and chlorine are severely volatilized, leading to serious secondary pollution. Therefore, developing low-temperature solidification technology for heavy metals in FA is of great significance. This article proposes a process for silica-assisted low-temperature sintering to solidify Pb in FA. The effects of roasting temperature (100–800 °C), roasting time (30–180 min) and curing agent dosage (0–12.5 wt%) on the leaching toxicity and immobilization rate of Pb were investigated. The optimum conditions for Pb solidification were calcination temperature of 600 °C, roasting time of 180 min and silica proportion of 10 wt%. The Pb leaching concentration, Pb immobilization rate and comprehensive strength of cured FA were 0.086 mg/L, 99% and 1.65 MPa, respectively, which satisfied the requirements of hazardous waste landfill (GB 18598–2019). The solidification mechanism indicates that most of the Pb 2+ reacts with SiO 2 to form a stable mineral phase PbSiO 3 , which is the main reason for the reduction of Pb leachability. In addition, at high temperatures, the added silicon as well as the Al 2 O 3 in the FA reacted with CaO to form aluminosilicate skeletons, which can also solidify a small portion of the Pb 2+ into the crystal lattice . As the roasting temperature increases, the chemical speciation of Pb gradually changes to the oxidizable and residual states. When the temperature is higher than 700 °C, a large amount of CaO reacts with silica to form CaSiO 3 , which hinders the reaction between PbO and SiO 2 and reduces the solidification rate of Pb. Finally, the feasibility and economy of the process were analyzed. The findings can provide theoretical guidance for the development of low-temperature detoxification process of FA.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）