WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 1
·1-20
·
IF 3.8
Liu Bangwei,Zhou Yan,Zhang Yiwei,Chen Dandan,Liu Wenhui,Lu Ping,Su Xiaoyu,Xia Tian
A zero-valent iron-loaded corn straw char (ZVI-CSC) was synthesized in this study for the remediation of As(V) and Cd(II) contamination. The impact of ZVI-CSC on the adsorption performance of As(V) and Cd(II) in solution, as well as their migration properties in soil, was investigated through adsorption kinetics and soil column leaching experiments, respectively. The results showed that the adsorption capacity of As(V) by ZVI-CSC was significantly improved to 14.42 g·kg −1 at pH = 3, compared with unmodified corn straw char (CSC). However, the adsorption capacity of Cd(II) was not improved. In the leaching experiments, the addition of ZVI-CSC to As(V)-contaminated soil resulted in a significant reduction of cumulative As(V) release rate from 32.26 to 3.11%, compared with corn straw char (CSC). Moreover, the role of ZVI in As(V)/Cd(II) remediation was analyzed. nZVI forms ≡Fe-OH and ≡Fe-OOH due to oxidation, which can form monodentate and bidentate complexes with As(V) via ligand exchange, thus promoting As immobilization. Furthermore, to further improve the adsorption performance of Cd(II), the electrostatic potential (ESP) of biochars with different surface functional groups (C = O, C–O–C, –OH, and –COOH) and their bond dissociation enthalpy (BDE) with As(V) and Cd(II) were calculated based on density functional theory (DFT). The results showed that –OH was the most effective for As(V) adsorption, and C–O–C was the most effective for Cd(II) adsorption. C = O and –COOH can be used to the simultaneous adsorption of As(V) and Cd(II). Therefore, the surface functional groups of ZVI-CSC can be selectively modified to improve its adsorption performance of As(V) and Cd(II). Graphical
研究领域:
环境科学
·
材料科学
·
化学工程
·
土壤修复
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 2
·629-639
·
IF 1.5
Wei Xiaolong,Wang Xingyu,Bian Wenjie,Li Xiaojie,Tian Yunting,Liu Longcheng
A simple approach for preparing high-efficiency and cost-effective adsorbent to extract uranium in nuclear wastewater is essential for safeguarding the environment. This study introduces an easy procedure to synthesize phosphate-rich biochar (PS) from sawdust by treating it with phosphoric acid before carbonization (700 °C). The sample was characterized by SEM, FT-IR, BET and XPS, indicating that the PS700 exhibited a high concentration of phosphorous groups, high specific surface area and developed mesoporous structure. Subsequently, the effects of pH (optimal at pH 7), adsorption kinetics (fitted by quasi-second-order), and sorption isotherms (modeled by Langmuir) were investigated. The best uranium (VI) adsorption performance of PS700 is 808 mg g −1 at 40 °C and pH 7. In addition, PS700 shows remarkable selectivity and recyclability for uranium (VI). The sorption mechanism can be attributed to the uranium (VI) binding with phosphate groups on the surface of sorbent, which significantly improve its ability for uranium (VI) adsorption. This study displays a great application prospect of PS700 as innovative adsorbent for the efficient extraction of uranium (VI) from nuclear wastewater.
研究领域:
环境科学
·
核工程
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Industrial Chemistry & Materials
·
2024
·
IF 0
Yihan Zhang,Yiliyasi Baikeli,Zehong Gao,Xamxikamar Mamat,Longyi Chen
Overuse of acetaminophen (APAP) has become a severe societal burden in recent years. The rapid and reliable detection of urinal APAP concentration can offer certain guidance for better management of APAP usage. This study explored the electrochemical sensing application of a novel electrocatalyst prepared from the biomass of Elaeagnus Angustifolia gum. The biomass was first activated by ferric chloride to form a porous biomass carbon material (FBC). Then synthesized cobalt oxide cracked nanoplate by alkali precipitation and calcination approach were hybridized onto the biomass carbon via facile sonication process. The electrocatalyst of CoO-FBC was characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), element mapping, transmission electron microscopy (TEM) and high resolution TEM, X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), thermo gravimetric analysis (TGA), Raman spectroscopy, and nitrogen adsorption/desorption analysis. CoO-FBC modified glassy carbon electrode (CoO-FBC/GCE) was characterized by various electrochemical methods including cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV). CoO-FBC/GCE sensor was used to measure APAP in pH 7.0, 0.1 M phosphate buffered saline (PBS) with two linear sensing range from 1 μM to 10 μM and 10 μM to 100 μM, sensitivity of 25.89 μA μM-1 cm-2 and 10.04 μA μM-1 cm-2, and limit of detection of 0.46 μM. The unavoidable inteference in measuring APAP is the inherent uric acid in urine. Uric acid and APAP exhibited adjacent and sometimes unseparable voltametric peak. This CoO-FBC/GCE sensor is capable to distinguish APAP from uric acid and to measure APAP in human urine sample with good recovery. This CoO-FBC/GCE sensor has promising application in clinical diagnosis and environmental detection.
研究领域:
分析化学
·
生物医学工程
·
环境科学
·
临床诊断
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DOI
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Kun Zhang,Yu Ge,Shaolang He,Fei Ge,Qianru Huang,Zhong Huang,Xinyue Wang,Yangping Wen,Binqiang Wang
Kudzu vine biochar (KVB) modified flexible carbon electrode (FCE) for the portable wireless intelligent sensing of clenbuterol (CLB) in bovine serum using cheap miniaturized analyzer composed of both smartphone and electrochemical mini-workstation was developed. Kudzu vine derived from abundant biomass residues of important traditional Chinese medicinal vine plants was selected for the preparation of KVB produced by pyrolyzing fine powders of kudzu vine at high temperature under oxygen-limited conditions. The morphology of KVB was characterized by scanning electron microscopy. FCE as flexible substrate electrode was prepared by the laser direct writing technique. The KVB modified FCE displayed excellent electrocatalytic response towards CLB in wide liner ranges from 0.95 to 14.31 μM with a low limit of detection of 0.75 μM. Practical application with satisfactory results will provide new opportunity for the comprehensive utilization of biomass residues of traditional Chinese medicinal plants as low-cost biochar for advanced electrode materials in portable wireless intelligent sensing platform based on cheap miniaturized analyzer composed of both smartphone and electrochemical miniworkstation for harmful residues in the quality safety of agro-products and food.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jipeng Sun,Wei Zhu,Jun Cao,Jun Zhong,Biao Mu,Xin Wang,Naixi Lin
In the context of low-carbon development, it is important to promote resource utilization of kitchen waste, which has the dual properties of pollution and resources. In this study, we explored a method to enhance biochar yield and tetracycline adsorption performance using subcritical dimethyl ether (DME) dewatering and lipid-extraction pretreatment . The mechanism of the effect of lipids and moisture on pyrolysis was investigated by comparing the differences among solid residue biochar, kitchen waste biochar, and dry kitchen waste biochar. Meanwhile, the adsorption performance and mechanism of solid residue biochar on tetracycline was clarified. It was found that lipids did not participate in the generation of biochar, but their decomposition products adhered to the biochar surface. Through DME pretreatment, 95.12% of lipids and 61.34% of moisture could be removed from kitchen waste, the biochar yield was increased by at least 22.77%, and the specific surface area and pore capacity were enhanced. The adsorption performance of tetracycline on solid residue biochar reached 79.11 mg•g −1 , and the potential adsorption mechanisms included π-π interaction, hydrogen bonding and pore filling.
研究领域:
环境科学
·
废物管理
·
化学工程
·
可持续发展
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Ling Gan,Yifan Wu,Haiou Song,Shupeng Zhang,Chang Lu,Shuang Yang,Zheng Wang,Bicun Jiang,Changming Wang,Aimin Li
Two double-layer composite electrodes were fabricated by coating anion exchange resin (A520E) and carboxyl-functionalized multi-walled carbon nanotubes (MWCNTs-COOH) onto activated carbon electrodes. Subsequently, an asymmetric capacitive deionization reactor was assembled to evaluate performance of the selective electro-adsorption of nitrate in 2 mM chloride and 1 mM nitrate solutions. In the experiment, the total amount of anions adsorbed in reactor reached 48.80 mmol/m 2 , with nitrate accounting for 54.07% in particular. It was confirmed that A520E/AC/GP electrode enhanced nitrate selectivity, and MWCNTs-COOH/AC/GP electrode increased the adsorption capacity. An investigation of desorption of anions showed nitrate was electrostatically adsorbed on electrode and then ion exchanged on the resin layer. When the applied voltage increased from 1.0 to 1.6 V, the total amounts of adsorbed anions increased, while the molar fraction of nitrate decreased. Desalination tests performed using different binary solutions of anions, revealed that the order of desalination capacities for anions is NO 3 − > SO 4 2− > F − ≈ Cl − . A highly linear relationship between the amounts of total adsorbed ions and desorbed chloride ions on resin electrode indicated the same effect of changing solution conditions (i.e., concentration of ions) on adsorption by ion exchange and the electric field.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 47
·37780-37788
·
IF 3.84
Yuanyuan Xu,Jinming Sun,Hou Chen,Liangjiu Bai
Bis(acetylacetonato) iron(II) (Fe(acac)2) was first selected to mediate the reversible-deactivation radical polymerization (RDRP) of acrylonitrile (AN) with predictable molecular weights, relatively narrow molecular weight distributions and high end-fidelity. The reversible termination (RT) mechanism accounted well for the reaction phenomena. The spinning performance of polyacrylonitrile (PAN) was investigated and the average diameter of the spinning fibers was approximately 300 nm. Activated carbon fibers (ACFs) were prepared via sodium hydroxide (NaOH) direct activation. The maximum specific surface area of the ACF was as high as 1165 m2 g−1. The pore volume of the ACF reached 0.14 cm3 g−1. Most is the contribution of the small mesopores (2–5 nm). The unique microstructures enabled the ACFs to have good compatibility with potassium hydroxide (KOH) as electrolyte. The highest capacitance reached 167 F g−1 at room temperature. The electrode showed well stabilized capacitance after 500 cycles and high energy/power density values due to the formation of small mesopores.
研究领域:
材料科学
·
电化学
·
高分子化学
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DOI
高影响因子
FIRE AND MATERIALS
·
2021
·Vol. 46
·期 1
·107-116
·
IF 2.407
Santosh Khanal,Yunhua Lu,Dandan Jin,Shiai Xu
Summary In this study, two layered double hydroxides (LDHs), ZnAl-LDH, and MgAl-LDH, were combined with intumescent flame retardant (IFR) consisting of ammonium polyphosphate and tris (2-hydroxyethyl) isocyanurate to prepare flame retardant high density polyethylene composites. The thermal and flame retardant properties of these composites were investigated by thermogravimetric analysis, limiting oxygen index measurement, and cone calorimetry, while the morphology and chemical structure of the char residue were analyzed by scanning electron microscopy, Fourier transfer infrared spectroscopy, and laser Raman spectroscopy. The results showed that the peak heat release rate (PHRR) of both HD/IFR/Zn-LDH and HD/IFR/Mg-LDH composites was 52.0% and 12.0% lower than that of HD and HD/IFR, respectively, suggesting that there was no difference in the reduction of PHRR between the two LDHs. The use of LDHs resulted in the formation of compact char residue with a high graphitic degree, but no significant increase in tensile strength.
研究领域:
材料科学
·
燃烧学
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Jian Li,Liguo Jiao,Zhiyu Li,Beibei Yan,Guanyi Chen,Sarwaich Ahmed
Tar is one of the biggest obstacles for commercial application of biomass gasification. Microwave catalytic cracking shows potential for not only removal but also conversion of tar. However, the coke formation under microwave has not been investigated. In the present work, a microwave applicable catalyst, Ni-Ce@SiC, was prepared. The effects of temperature and inlet tar concentration on toluene and phenol conversions were investigated under both microwave and conventional heating conditions, and the influences on coking rate were also focused. Results showed that increasing temperature and reducing inlet tar concentration improved tar conversion. Inlet tar concentration and cracking of phenol typically caused more coke deposition. Based on the characterizations of the spent catalysts, the microwave could eliminate the coke deposition and alter the coke types. The mechanism of microwave on the coke suppression was revealed. This study provids an in-depth understanding of the coke formation during the microwave process, and also builds foundation for the design and operation of catalytic process.
研究领域:
能源科学
·
化学工程
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Zhiqiang Guo,Rui Chen,Rongrong Yang,Fanjun Yang,Jun Chen,Yuan Li,Ru Zhou,Jinzhang Xu
Novel amino-modified rice bran biochar/MgFeAlO 4 (RB@MgFeAlO 4 -NH 2 ) magnetic composites were synthesized via a simple one-step solvothermal approach and applied for removing toxic Ni(II) from wastewater. The elimination process and sorption performance of Ni(II) on RB@MgFeAlO 4 -NH 2 were analyzed by combining batch experiments and spectral techniques. The sorption isotherms and kinetic data indicated that Ni(II) sorption on RB@MgFeAlO 4 -NH 2 was monolayer and rapid. The experimental results confirmed that the obtained RB@MgFeAlO 4 -NH 2 magnetic composite had high sorption capacity for Ni(II). The maximum sorption capacity of Ni(II) on RB@MgFeAlO 4 -NH 2 was 201.62 mg g −1 . The researches based on the sorption mechanism showed that the ion exchange mechanism accounted for 76.51% of Ni(II) sorption. In addition, the amino, carboxyl and hydroxyl functional groups were also involved in the complexation with Ni(II). In view of its multiple advantages of environmental friendliness, low cost, easy magnetic separation and high sorption capacity, RB@MgFeAlO 4 -NH 2 will be an excellent adsorbent for low-cost and efficient elimination of Ni(II) from aqueous solutions.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 6
·6123-6132
·
IF 2.914
Liang Zixuan,Tu Qianqian,Su Xiaoxuan,Yang Xiangyu,Chen Junyu,Chen Yi,Li Hong,Liu Caihong,He Qiang
Granular activated carbon (GAC) has been proved to accelerate the formation of aerobic granules during wastewater treatment. However, there has never been a study on the extracellular polymeric substances (EPS) or structural stability of the GAC aerobic granules. Thus, this study evaluated the impact of GAC on these characteristics. With GAC addition, granules matured 12 days earlier than those of the control group. Scanning electron microscopy showed the surface of aerobic granules enhanced by GAC to be denser and smoother than the surface of control granules, which could be the first line of defense against external selection pressure. After granules matured, there was no difference in contamination removal between the two types of granules. The protein content in EPS of GAC aerobic granules was higher than that of the control group; however, there was no difference in the polysaccharide content. EPS fluorescence in situ staining demonstrated that inside the aerobic granules, a high concentration of protein encapsulated the GAC. In addition, integrity coefficients indicated that GAC significantly improved the ability of aerobic granules to resist hydraulic shear. The result of hydrolase treatment proved that the outer layer structure of the GAC aerobic granules was maintained by β-polysaccharide, and the inner layer structure was maintained by protein. The ability of GAC-enhanced aerobic granules to resist single hydrolase was stronger than that of the control group.
研究领域:
环境工程
·
微生物学
·
水处理技术
·
生物膜
·
环境生物技术
✓ 已验证
DOI
高影响因子
Carbon Letters
·
2020
·Vol. 30
·期 6
·657-665
·
IF 1.992
Li Jiajia,Hu Jiajun,Wang Kai,Xia Hongyan
Effective processing and use of coal slime is of great significance to protect the environment and save resources. Different coal slimes (untreated with 43 wt% ash content, crushed and flotation treated with 10 wt% ash content, and pre-carbonized) were activated with KOH to prepare porous activated carbon. The results show the activated carbon prepared from coal slime with 10 wt% ash had high specific surface area (3037 m 2 /g) and pore volume (1.66 cm 3 /g), which was ascribed to the suitable contents of minerals as template and oxygen-containing functional groups. Electrochemical measurements exhibited the best specific capacitance of 220 F/g at 0.1 A/g and the cycle stability of over 100% capacitance retention after 1000 cycles at 5 A/g in 6 M KOH solution. Due to the high specific surface area, superior electrochemical performance, and facile and low cost, developing highly porous activated carbon for supercapacitors is one alternative way for effective use of coal slime waste.
研究领域:
材料科学
·
环境工程
·
能源存储
·
碳材料
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）