Frontiers in Bioengineering and Biotechnology
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2023
·
IF 5.7
Wang Lin,Cheng Wen-Chieh,Xue Zhong-Fei,Rahman Md Mizanur,Xie Yi-Xin,Hu Wenle
Inappropriate irrigation could trigger migration of heavy metals into surrounding environments, causing their accumulation and a serious threat to human central nervous system. Traditional site remediation technologies are criticized because they are time-consuming and featured with high risk of secondary pollution. In the past few years, the microbial-induced carbonate precipitation (MICP) is considered as an alternative to traditional technologies due to its easy maneuverability. The enzyme-induced carbonate precipitate (EICP) has attracted attention because bacterial cultivation is not required prior to catalyzing urea hydrolysis. This study compared the performance of lead (Pb) and copper (Cu) remediation using MICP and EICP respectively. The effect of the degree of urea hydrolysis, mass and species of carbonate precipitation, and chemical and thermodynamic properties of carbonates on the remediation efficiency was investigated. Results indicated that ammonium ion (NH4+) concentration reduced with the increase in lead ion (Pb2+) or copper ion (Cu2+) concentration, and for a given Pb2+ or Cu2+ concentration, it was much higher under MICP than EICP. Further, the remediation efficiency against Cu2+ is approximately zero, which is way below that against Pb2+ (approximately 100%). The Cu2+ toxicity denatured and even inactivated the urease, reducing the degree of urea hydrolysis and the remediation efficiency. Moreover, the reduction in the remediation efficiency against Pb2+ and Cu2+ appeared to be due to the precipitations of cotunnite and atacamite respectively. Their chemical and thermodynamic properties were not as good as calcite, cerussite, phosgenite, and malachite. The findings shed light on the underlying mechanism affecting the remediation efficiency against Pb2+ and Cu2+.
研究领域:
环境科学
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2021
·Vol. 27
·期 11
·4829-4838
·
IF 2.817
Han Wei,Zhang Yingchun,Liu Rugeng,Sun Yang,Li Mei
In order to recover salt and minimize waste volume, a sequential precipitation method was proposed to remove rare earth (RE = La, Sm, Nd, Dy), Cs, Sr, and Ba from spent electrolyte in the form of phosphate and carbonate precipitation, respectively. The thermodynamic calculation confirmed the feasibility of the process. The precipitation results indicated that RE 3+ and Cs + could be converted to insoluble phosphates using Na 3 PO 4 , whereas Sr 2+ and Ba 2+ to insoluble carbonates by adding K 2 CO 3 . Meanwhile, the phosphate precipitation process was monitored online by square wave voltammetry, and the results showed that with the addition of Na 3 PO 4 , the peak current densities corresponding to the reduction of RE 3+ decreased gradually. The molten salt containing La 3+ , Sm 3+ , Nd 3+ , Dy 3+ , Cs + , Sr 2+ , and Ba 2+ was used to simulate the waste electrolyte for sequential precipitation; the removal rates of RE, Sr, and Ba were found to be over 95.00%, except for Cs 79.17%. Graphical abstract In order to recover the molten salt, the sequential precipitation method was proposed to remove rare earth (RE = La, Sm, Nd, Dy), Cs, Sr, and Ba from spent electrolyte. RE and Cs were separated using Na 3 PO 4 and Sr and Ba using K 2 CO 3 . The removal rates estimated by ICP-OES were found to be over 95.00%, except for Cs.
研究领域:
环境工程
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化学工程
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分析化学
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废物管理
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2016
·
IF 2.29
Yue Yang,Boyi Xie,Ruixiang Wang,Shengming Xu,Jianlong Wang,Zhenghe Xu
The utilization of high-phosphorus tungsten ores has attracted extensive attention with the mining and utilization of rich tungsten ores. To extract and separate tungsten from acidic high-phosphorus solution effectively, a novel process was developed. Firstly, tungsten was extracted directly in acid medium by solvent extraction . 99.8% tungsten in acidic high-phosphorus solution was extracted with Aliquat 336 in kerosene by one extraction stage under the conditions of O:A = 1, pH = 2, 25 °C, t = 10 min, 5% v/v 2-Octanol and 10% v/v Aliquat 336. And then, tungsten and phosphorus were preliminary separated through stripping process. Over 95% tungsten were recovered after five stripping stages under the optimum stripping conditions of 2.5 M ammonium bicarbonate , 8 min stripping time, O:A = 1:1, pH = 9, and 60 °C, but only about 1.2% phosphorus was recovered from feed liquor. Finally, a small amount of phosphorus left in strip liquor was deeply removed by magnesium salt precipitation method on the optimum conditions of pH = 10.0, 25 °C, reaction time 1 h and Mg/P molar ratio of 1:2 and the ammonium tungstate solution meeting the requirements of producing high-quality ATP can be obtained successfully. Compared to traditional phosphorus removal route, the process in this paper can help extract tungsten directly in acidic medium and decrease the quantity of phosphorus through extraction-stripping process, significantly reducing the consumption of alkali and magnesium salt and improving the separation efficiency of tungsten from acidic high-phosphorus solution.
研究领域:
冶金化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2023
·Vol. 15
·期 8
·1525
·
IF 3.4
Rui Ding,Ziyu Wang,Xiangyu Zhao,Peng Cao,Xin Chen,Wenjing Chen
Coastal erosion is increasing worldwide due to the increasing frequency of extreme natural phenomena and excessive human exploitation. In this study, a small model experiment was conducted to investigate the solidification effects of three enzyme sources—soybean urease, freshwaterBacillus pasteurella, and seawater domesticatedBacillus pasteurella—on coastal sediments and their impacts in a seawater environment. The solidifying effect of different enzyme sources was determined by measuring the mechanical properties and corrosion resistance of the cured specimen model. The influence of solidified seawater in a seawater environment was obtained by measuring the changes in the pH value, calcium ion concentration, and ammonia nitrogen content of solidified seawater. The results show that different enzyme sources have a certain strengthening effect on coastal sediments. The mechanical properties of coastal sediments can be enhanced by increasing the amount of enzyme solution or level of solidification and can effectively resist simulated flow erosion. Comparing the reinforcement effects of different enzyme sources, it can be seen. It was observed thatBacillus pasteurellaacclimated in seawater had better reinforcement effects thanBacillus pasteurellafresh water, andBacillus pasteurellafresh water had better reinforcement effects than soybean urease. In the seawater measurement tests, the solidification of coastal sediments using different enzyme sources led to a decrease in the seawater pH value, and the acidification of seawater dissolved the generated calcium carbonate, increased the concentration of calcium ions in seawater, and produced ammonia nitrogen as a byproduct in the seawater. It was observed that, compared with the other two enzyme source solutions, the seawater-domesticatedBacillus pasteurellacan better adapt to the high-salt environment of seawater, microbial metabolism is not inhibited, urea decomposition ability is improved, and calcium carbonate production is higher, which can effectively improve the engineering characteristics of coastal sediments and play a positive role in coastal protection and development.
研究领域:
海洋生物学
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环境科学
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土木工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Ruixing Wang,Siyuan Bian,Bao Zhang,Lengfeng Yan,Linjun Feng,Jing Bai
Microbial-induced carbonate precipitation (MICP) has garnered increasing attention in the realm of building materials. Among them, urease microorganisms have been extensively investigated due to their favorable attributes, including facile reaction control, heightened mineralization efficiency, and straightforward microorganism cultivation. Nevertheless, the presence of ammonia byproducts throughout the reaction process significantly restricted its extensive utilization. This work employed the application of microbial-induced carbonate precipitation (MICP) technology to modify the surface of cement-based materials in a solution environment. Simultaneously, the generation of struvite (MgNH 4 PO 4 •6H 2 O) was induced to eliminate ammonia byproducts and improve the cementitious ability of the film layer. The potential synergistic impact between calcium carbonate (CaCO 3 ) and struvite was observed, resulting in the production of a composite film with enhanced performance. Furthermore, the elimination efficacy of ammonia byproducts was found to exceed 90% after a treatment duration of 96 h.
研究领域:
土木工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Jun Cheng,Yannan Li,Leiqing Hu,Jianzhong Liu,Junhu Zhou,Kefa Cen
A phase-change solvent for CO2 absorption was prepared by mixing N-methyl-1,3-diaminopropane (MAPA) and N,N-dimethylformamide (DMF). In this MAPA/DMF solvent, MAPA-carbamate precipitate was formed after CO2 absorption to facilitate reducing energy consumption of amine regeneration. The CO2 uptake of MAPA/DMF solvent (14.8 mg/g solvent) was increased by 22% compared with that of MAPA/water solvent (12.1 mg/g solvent). For MAPA/DMF solvent, time was reduced by 22% to reach the CO2 absorption equilibrium. The maximum CO2 uptake rate of MAPA/DMF solvent was 30% higher than that of MAPA/water solvent because DMF displayed higher CO2 solubility and lower MAPA-carbamate solubility than water. Differential scanning calorimetry and thermogravimetry experiments revealed that MAPA(H+)2 and MAPA(CO2–)2 compositions in MAPA-carbamate precipitate first decomposed (peak temperature = 59.9 °C). Subsequently, the MAPACO2 compositions in precipitate also decomposed (peak temperature = 124.2 °C).
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
GEOMICROBIOLOGY JOURNAL
·
2020
·
IF 1.989
Zijun Zhao,Chunli Zhao,Hoaithuong Do,Mingtang Li,Di Wu,Yuanhui Chen,Feng Zhang
Carbonate mineralization based on urea hydrolysis by bacteria has a significant implication in the remediation of heavy metals polluted environment, but a huge quantity of ammonium released due to the addition of urea may lead to non-point source pollution. In this study, a lead-resistant strain ZN5, identified as Brevibacillus laterosporus, which could induce different carbonate precipitations of Pb (II) through ammonification and nitrate assimilation processes without the addition of urea, was isolated. The maximum of pH values of bacterial fermentation suspensions were 9.07 and 9.22 during ammonification and nitrate assimilation processes, respectively. The minimum inhibitory concentrations of Pb (II) to strain ZN5 in two processes were 150 and 100 mg/L, respectively. Strain ZN5 could rapidly remove 94% and 70% of Pb (II) at an initial concentration of 15 mM through two processes, respectively. Furthermore, the induced carbonate precipitates of Pb (II) in ammonification and nitrate assimilation processes were dense spherical crystal of Pb3(CO3)2(OH)2 and loose irregular crystal of PbCO3, respectively, based on XRD and SEM-EDS. Besides, these two biominerals were relatively stable in dilute acid solution, especially the biomineral formed during nitrate assimilation process. These results showed that strain ZN5 had promising application in remediation of Pb-contaminated environment.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Zhong-Fei Xue,Wen-Chieh Cheng,Lin Wang,Wenle Hu
Heavy metal contamination has caused serious threats to surrounding fragile environments and human health. While the novel microbial-induced carbonate precipitation (MICP) technology in the recent years has been proven effective in improving material mechanical and durability properties, the mechanisms remedying heavy metal contamination still remain unclear. In this study, the potential of applying the MICP technology to the lead remediation under the effects of urease activity and calcium source was explored. The values of OD 600 corresponding to the ureolytic bacterial activity , electrical conductivity (EC), urease activity (UA) and pH were applied to monitor the degree of urea hydrolysis. Further, the carbonate precipitations that possess different speciations and cannot be distinguished through test tube experiments were reproduced using the Visual MINTEQ software package towards verifying the validity of the proposed simulations, and revealing the mechanisms affecting the lead remediation efficiency. The findings summarised in this work give deep insights into lead-contaminated site remediation engineering.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Miao Liu,Xu Chen,Lixiong Cai,Hanbin Luo
To further apply microbially induced carbonate precipitation (MICP) in the environmental civil engineering, this study explored how the widely present humic substances (HS), typically humic acid (HA) and fulvic acid (FA), tailor the strength and microstructures of the MICP-based bio-cement. The presence of HA was found to reduce the yield of bio-precipitates, lower the strength of the resulting cemented sandstone by 27 %, and reduce the particle sizes and surface smoothness of the precipitates. By further examining the biomineralization in the solution system, a similar inhibitory effect on MICP was confirmed and found to be 50 % more substantial when tailored by FA (which possesses more densely distributed functional groups) than HA. Furthermore, HS was found to reduce the crystal sizes by chelating with calcium ions and serving as nucleation sites, and prolonged the existence of the unstable bacteriogenic vaterite by serving as a crystal stabilizer.
研究领域:
环境工程
·
微生物学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 35
·17998-18006
·
IF 11.301
Yinglun Sun,Yue Wang,Lingyang Liu,Bao Liu,Qingnuan Zhang,Dandan Wu,Hongzhang Zhang,Xingbin Yan
Although water-in-salt (WIS) electrolytes have significantly extended the voltage window of aqueous batteries and supercapacitors, the inevitable precipitation of highly concentrated salts at low temperatures leads to performance degradation and even failure of devices. The introduction of an organic co-solvent can effectively overcome this crucial drawback; however, the underlying mechanism remains unclear. Herein, we demonstrate the study of acetonitrile (ACN) suppressing salt precipitation mechanism in NaClO4-based WIS electrolytes through combining theoretical simulation and experimental analyses. ACN molecules strongly coordinate with Na+ ions to change the solvation structure of the cation–anion from aggregates to contact ion pairs and/or solvent separated ion pairs, weakening the interaction between anions and cations, thereby suppressing the precipitation of NaClO4. Furthermore, using the hybrid electrolyte, a built carbon-based supercapacitor achieves a voltage window of 2.3 V. Impressively, it also retains 86.5% of the room-temperature capacitance and exhibits excellent rate capability and temperature resistance at an ultra-low temperature of −50 °C. This work provides guidance for non-inert co-solvents suppressing salt precipitation, which helps to obtain desired electrolytes for reliable low-temperature supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Jove-Journal of Visualized Experiments
·
2017
·
IF 1.232
Junlian Wang,Meiying Xie,Xinyu Liu,Shengming Xu
We present the synthesis of (2,3-dimethylbutyl)(2,4,4'-trimethylpentyl)phosphinic acid as an example to demonstrate a method for the synthesis of high purity nonsymmetric dialkylphosphinic acid extractants. Low toxic sodium hypophosphite was chosen as the phosphorus source to react with olefin A (2,3-dimethyl-1-butene) to generate a monoalkylphosphinic acid intermediate. Amantadine was adopted to remove the dialkylphosphinic acid byproduct, as only the monoalkylphosphinic acid can react with amantadine to form an amantadine∙mono-alkylphosphinic acid salt, while the dialkylphosphinic acid cannot react with amantadine due to its large steric hindrance. The purified monoalkylphosphinic acid was then reacted with olefin B (diisobutylene) to yield nonsymmetric dialkylphosphinic acid (NSDAPA). The unreacted monoalkylphosphinic acid can be easily removed by a simple base-acid post-treatment and other organic impurities can be separated out through the precipitation of the cobalt salt. The structure of the (2,3-dimethylbutyl)(2,4,4'-trimethylpentyl)phosphinic acid was confirmed by 31P NMR, 1H NMR, ESI-MS, and FT-IR. The purity was determined by a potentiometric titration method, and the results indicate that the purity can exceed 96%.
研究领域:
有机化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Li Jieyang,Zhang Huanlei,Luo Changhao,Cheng Dongbo,Xu Wanping,Lin Meng
Electrochemical conversion of CO 2 into fuels represents an important pathway for addressing the challenges of climate change and energy storage. However, large-scale applications remain hindered by the instability and inefficiency of CO 2 reduction systems, particularly under highly alkaline electrolytes and high current densities. One primary obstacle is the cathodic salt precipitation, which hinders mass transfer and blocks active sites limiting the lifespan of these systems. Here, we present a non-isothermal strategy that leverages a thermal gradient across the membrane electrode assembly to enhance electrochemical performance and suppress salt precipitation. By maintaining a cooler cathode and warmer anode, we exploit the Soret effect to drive cations away from the cathode, mitigating salting-out while boosting anodic activity and cathodic CO 2 solubility. The non-isothermal case has demonstrated over 200 h of stable operation at 100 mA cm −2 under highly alkaline conditions, outperforming conventional isothermal systems. Techno-economic analysis reveals reductions in CO 2 -to-CO production costs, supporting the scalability of this strategy. These findings enable the practical deployment of stable, high-efficiency CO 2 electrolysis systems.
研究领域:
能源科学
·
环境科学
·
材料科学
✓ 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）