ACS Omega
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2023
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IF 4.1
Lei Wang,Zeen Yv,Licheng Ma,Qi Zheng,Tong Wang,Xiaokui Che,Xinglan Cui,Hongxia Li,Shenyv Wei,Xinyue Shi
Calcium carbonate is a common natural mineral with a wide range of applications. In this study, hollow calcite microspheres were successfully synthesized by using calcium chloride and sodium carbonate as raw materials in an SDS–PEG system. The results suggested that the appropriate concentration of SDS is necessary during the spherical crystallization of calcium carbonate. It was found that the crystals started to aggregate under the effect of SDS, and aggregation was enhanced with an increase in SDS concentration, leading to the transformation from hollow to solid microspheres. However, high temperatures will lead to the transformation from calcite to aragonite, resulting in the collapse of the formed spherical structure. Infrared spectroscopy and conductivity analysis suggested that when the concentration of SDS reached 0.3 g/L in the PEG–SDS system, SDS and PEG formed a spherical supramolecular structure. This structure could act as a template, leading to the aggregation of calcite through electrostatic attraction and finally to the formation of a hollow spherical structure.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
WATER AIR AND SOIL POLLUTION
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2016
·Vol. 227
·期 12
·1-12
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IF 1.551
Zhang Zhan-hang,Zhang Jing-li,Liu Jian-ming,Xiong Zhen-hu,Chen Xu
Zeolitic imidazole frameworks (ZIFs), a new adsorbent with a high chemical and thermal stability and a high adsorption capacity, are used for adsorptive removal of azo dyes. The synthesized ZIF-67 was characterized with Fourier transform infrared spectroscopy (FTIR), thermogravimetric–differential thermal analysis (TG–DTA) and zeta potential instrument. The adsorption of some azo dyes on ZIF-67 in the single dye systems showed that the removal efficiencies are congo red > methyl orange > methyl red > methyl blue. The highest adsorption capacity of congo red and methyl orange were 3900 and 1340 mg/g, respectively. In a binary dye system the adsorption capacity of congo red decreased, while the removal efficiency of methyl orange increased in comparison with the single systems, indicating that a competitive adsorption of congo red and methyl orange over the ZIF-67 occurred. The experimental data indicate that the electrostatic attraction between ZIF-67 and congo red is the major driving force and the π – π stacking is also responsible for dye adsorption. After 5 cycles of ZIF-67 adsorption and desorption, the congo red removal efficiency maintained more than 95%.
The adsorption of Congo red and Methyl orange on the ZIF-67
研究领域:
环境科学
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材料科学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Jian Tang,Yue-Fei Zhang,Yun Liu,Yan Li,Hui Hu
Polyacrolein (PA) was prepared by photoinduced free radical polymerization for adsorption of congo red (CR). The structural and physicochemical properties of PA were characterized using BET, zeta potential measurements, SEM, FT-IR and XPS. The adsorption process of CR accorded with the pseudo -second-order kinetics, while the adsorption isotherm conformed to be the Langmuir model and the adsorption was proved to be the spontaneous and endothermic process (Δ G 0 < 0, Δ H 0 > 0). Electrostatic attraction, hydrogen bond and chemical reaction (formation of imine) were the critical driving forces of adsorption. The good removal efficiency obtained during the five executed cycles suggested a good reusability of PA. It was noteworthy that salts in CR solution could promote the adsorption capacity of PA, in which Ca (II) could obviously improve the adsorption capacity and shorten the time to reach adsorption equilibrium. These results have provided very useful information for removing CR and enhanced our understanding of the adsorption mechanism of PA on CR.
研究领域:
环境科学
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材料科学
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2014
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IF 2.063
Ran-ran Shan,Liang-guo Yan,Yan-ming Yang,Kun Yang,Shu-jun Yu,Hai-qin Yu,Bao-cun Zhu,Bin Du
The Mg–Al-CO 3 -LDH with Mg 2+ /Al 3+ molar ratio of 2 was prepared via coprecipitation method at constant pH of 9–10 and used to remove three red dyes by batch adsorption method. The results showed the Mg–Al-LDH were well crystallized and can adsorb the red dyes effectively. The optimal adsorbent dosage and contact time were 1.0 g and 60 min, respectively. Adsorbed amount hardly changed when pH < 10. The adsorption kinetics fit the pseudo-second order kinetic models well and isotherms correspond to Langmuir model strictly. All the relevant mechanisms were studied and manifested as anion exchange and also electrostatic attraction for CR.
研究领域:
环境科学
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材料科学
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高影响因子
RSC Advances
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2016
·Vol. 6
·期 11
·8797-8805
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IF 3.289
Xiaolong Yao,Shubo Deng,Rui Wu,Siqi Hong,Bin Wang,Jun Huang,Yujue Wang,Gang Yu
Highly efficient aminated wheat straw (WS) was successfully prepared by first oxidizing with nitric acid and then grafting tetraethylenepentamine (TEPA) onto WS surfaces, and the HNO3 oxidation process made more carboxyl and hydroxyl groups available for subsequent reactions. Due to the presence of lots of amine groups on the surfaces, the aminated WS exhibited positive zeta potentials at pH below 9.8 and had the sorption capacity of up to 454 mg g−1 for anionic Cr(VI) at pH 2.2 according to the Langmuir fitting, higher than other reported adsorbents. In spite of some coexisting pollutants in the electroplating wastewater, the aminated WS still exhibited high adsorption capacity and selectivity for Cr(VI). The spent adsorbent can be reused after regeneration and had relatively high Cr(VI) adsorption in five cycles. Electrostatic attraction was mainly responsible for Cr(VI) adsorption on the aminated WS. The adsorbed Cr(VI) anions were reduced to Cr(III) on the adsorbent surfaces, and the formed Cr(III) cations were released into the solution and adsorbed on the adsorbent via chelation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Jun Li,Jianwei Zhang,Yingzhe Du,Xiaoxia Liu,Ronghao Liu,Yanzhao Yang
Efficient gold extraction is of paramount importance, but how to improve the extraction efficiency and enhance the driving force of the extraction process is still to be explored. This study introduces an innovative approach using versatility ionic liquids (ILs) to overcome existing challenges. A tailored IL was synthesized and employed computational tools, including the Interaction Region Indicator, to predict its effectiveness in gold extraction. Quantum chemical calculations elucidated the interplay between hydrogen bonding capability and ion exchange properties of the ILs. Subsequent optimization of experimental conditions (0.1 mol/L HCl, 10.6 mg IL) yielded a remarkable 98.4 % extraction efficiency at 45 °C. Molecular dynamics simulations affirmed the IL's exceptional selectivity for Au(III) extraction, with analysis revealing that the extraction mechanism primarily hinged on electrostatic attraction and van der Waals interactions between ionic liquid cations and [AuCl 4 ] − . This mechanism aligns with the established anion exchange mechanism, validated through Ultraviolet–visible spectrometer (UV–Vis), Nuclear Magnetic Resonance spectrometer (NMR), and Liquid Chromatograph Mass Spectrometer (LC-MS) analyzes. To complete the extraction cycle, 1.0 mol/L K 2 C 2 O 4 was employed as a stripping agent for efficient Au(III) recovery from the loaded IL phase, facilitating repeated extraction cycles. This study underscores the sustainability of the IL-based Au(III) extraction process, maintaining consistently high extraction rates even after five cycles. In summary, this method does not use solvent, enabling environmentally friendly Au(III) extraction.
研究领域:
化学
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环境科学
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高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Yaxin Gu,Yi Fang,Huayi Cai,Shaobo Yang,Song Yan,Chaochao Cao,Chengchun Tang
Porous boron nitride material (p-BN), as a nanomaterial, is often used in pollutant removal (antibiotics and heavy metal ions in water, etc.), but its effectiveness for the removal of anionic pollutants has rarely been reported. Here, a cerium oxide modified p-BN (Ce/p-BN-X) was prepared and used for phosphate removal. It has a high specific surface area, a rich pore structure, abundant reactive groups such as amino groups, positively charged oxygen vacancies, and high stability, which enhanced the adsorption of phosphate. Moreover, the adsorption kinetics and isotherms analysis revealed that the adsorption capacity of Ce/p-BN-4 was 22.05 times higher than that of p-BN at an initial concentration of 20 mg L–1. The adsorption mechanism mainly includes ion exchange, inner-sphere complexation, and electrostatic attraction. In summary, this work provides a simple strategy to improve the adsorption of p-BN on phosphate, which greatly compensates for the deficiency of p-BN in anion adsorption and has great potential for application.
研究领域:
环境科学
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材料科学
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2015
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IF 2.587
Haijun Xu,Shenmei Sun,Jiangxiong Wei,Qijun Yu,Qiang Shao,Chun Lin
A novel monovinyl β-cyclodextrin monomer (MA-β-CD; MA = methacrylate) was employed to synthesize polycarboxylate superplasticizers modified with β-CD as pendant groups, and their dispersing performance was tested in the absence and presence of montmorillonite. Adsorption measurement and X-ray diffraciton analysis indicated that their interactions with Ca-montmorillonite originated from electrostatic attractions between carboxylate groups and the positive charge of Ca-montmorillonite particle. Compared with conventional polycarboxylate superplasticizers (PCEs) only with poly(ethylene oxide) (PEO) chains, polycarboxylate superplasticizers with β-CD as pendants displayed enhanced robustness toward clay. This was attributed to the steric hindrance instigated from β-CD groups with the structure of a hollow truncated cone by hindering the sorption of polycarboxylate polymers on the surfaces of Ca-montmorillonite.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Journal of Cleaner Production
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2023
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IF 11.1
Na Chai,Lihui Gao,Shulei Li,Yijun Cao,Zilong Ma,Lingni Li,Ming Hu
A superior persimmon peel-based imprinted material (Ga-IIP-PP-OP) was obtained by optimizing the preparation conditions such as cross-linking agent dosage, type of solvent, addition amount of template ions, polymerization temperature and polymerization time. The internal and external morphology and structure of Ga-IIP-PP-OP were examined by SEM, TEM and BET, and the adsorption mechanism of gallium ions on Ga-IIP-PP-OP was analyzed by FTIR, XPS and DFT calculation . The results showed that under the optimum conditions (methanol-water (3:7) as solvent, addition amount of template ions = 1.42 μmol, cross-linking agent dosage = 0.351 mg/g pp powder , polymerization temperature = 80 °C, polymerization time = 6 h), the adsorption capacity of Ga-IIP-PP-OP can reach 352.64 mg/g under pH = 3, which is significantly higher than other reported gallium adsorbents. Moreover, Ga-IIP-PP-OP with abundant porous structure and dense cross-linking network exhibited a strong affinity for Ga (III) even in binary systems with similar competitive ions. The remarkable adsorption capacity of Ga-IIP-PP-OP is attributed to electrostatic attraction of phenoxy negative ions to Ga (III) and chelation of phenolic hydroxyl and ester groups with Ga (III), with an ester group in the tannin structural unit and adjacent hydroxyl groups on another structural unit as the most stable adsorption site. These results revealed that the optimization of the synthesis conditions allowed the imprinted material to demonstrate greater potential for selective adsorption and efficient recovery of Ga (III).
研究领域:
环境科学
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材料科学
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2020
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IF 4.794
Meng-Ya Xu,Hong-Liu Jiang,Ze-Wu Xie,Zeng-Tian Li,Di Xu,Fu-An He
The nitrile groups in the tetrafluoroterephthalonitrile-crosslinked β-cyclodextrin (β-CD) were modified by (1) the reaction with the diethanolamine resulting in the hydroxyalkylaminoalkylamide groups or the hydroxyalkylaminoimide groups (2) the reduction of the borane-tetrahydrofuran complex resulting in the amide groups to form two novel β-CD based polymers (CDPs), namely the CDP-DEA and the CDP-NH 2 , correspondingly. Furthermore, the dye adsorption abilities of these two CDPs in the aqueous solution were investigated using the anionic dyes including the Congo red (CR) and the orange G (OG). For both the CDP-DEA and the CDP-NH 2 , the pseudo second-order model fitted well with their adsorption dynamics and their equilibrium adsorption process followed the Langmuir isotherm model. The maximum adsorption capacities of the CDP-DEA for CR at pH = 5 and OG at pH = 3 were 813 mg/g and 442 mg/g, respectively, while the corresponding values of the CDP-NH 2 were 40 mg/g and 446 mg/g, respectively. It was found that the electrostatic attraction played an important role in the anionic dye adsorption of the CDP-DEA and the CDP-NH 2 .
研究领域:
化学工程
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环境科学
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DOI
高影响因子
Reaction Chemistry & Engineering
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2024
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IF 3.4
Zhiwei Liu,Jingjing Wang,Qian Liu,Liying Wang,Zhenzhu Cao,Yongfeng Zhang
Excess fluoride in drinking water can cause poisoning. To solve this problem, a porous metal–organic framework (MOF) was fabricated via the solvothermal approach and employed for the removal of fluoride ions from water. ZrAl-MOF was fabricated by self-assembly of polyvalent Zr4+, Al3+metal ions and 4,4-biphenyldicarboxylic acid (BPDC). The developed metal-based ZrAl-MOF was used to remove fluoride ions from water and could remove fluoride ions to a maximum of 109.2 mg g−1 (308 K). ZrAl-MOF has a special core–shell structure with a layer of small balls stacked outside and cobweb-like structure inside. The properties of the bimetallic MOF can be adjusted by Zr4+, Al3+ metal ions and BPDC to meet the demand for maximum adsorption performance. Bimetallic MOFs commonly have a substantial specific surface area, capable of providing numerous active sites and being favorable for the adsorption reaction of substances. The electronic properties of different metals may lead to stronger electrostatic attraction and enhanced adsorption of fluoride ions. The factors affecting the adsorption effect, such as solution pH, ZrAl-MOF dosage, reaction time, initial fluoride concentration, temperature, and coexisting anions, were optimized. The fluorine adsorption capacity of ZrAl-MOF was less affected by the adsorbent under acidic conditions and by the presence of sulphate and nitrate ions in the water. In addition, the experimental data were fitted with various adsorption kinetic and isotherm models. It is shown that fluorine adsorption is feasible and spontaneous. The fluorine adsorption mechanism of ZrAl-MOF is mainly electrostatic attraction and ion exchange.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Sujie Shan,Tao Zhang,Wei Wang,Dongmei Liu,Wenxin Shi,Fuyi Cui
Recently, to mitigate eutrophication nuisance, the use of cerium(Ce)-based materials for effectively eliminating phosphate from waters and wastewaters has garnered increasing attention. However, insufficient sorption capacities as well as difficulty for spent sorbents separation still restrict their development and utilization. Herein, magnetic Ce 2 (CO 3 ) 3 ·xH 2 O/Fe 3 O 4 (M−HCC) sorbent was firstly synthesized via a facile co-precipitation method and employed for removing phosphate from aqueous solutions. It was showed that M−HCC displays a fast sorption kinetic, notable sorption capacity of 98.3 mg-P/g, wide pH applicable range (pH 3–9) and strong selectivity for phosphate in the co-existence of common anions (i.e. Cl − , NO 3 − , SO 4 2− , HCO 3 − and F − ) and cations (i.e. Ca 2+ and Mg 2+ ). Moreover, the uptake of phosphate by M−HCC was independent of the ionic strength of solution. The application of as-prepared sorbent in eutrophic water and wastewaters evidenced that, M−HCC performs very well in the real water bodies, and the phosphate level of outflow could be reduced from 0.55 mg-P/L to ≤ 0.03 mg-P/L at a low dosage of 0.1 g/L. As the spent M−HCC could be easily recovered from treated liquids and regenerated satisfactorily, M−HCC also exhibits a good reusability. Mechanistic investigation revealed that the formation of inner-sphere complexation via ligand exchange between phosphate and carbonate/surface hydroxyls of M−HCC as well as electrostatic attraction are answerable for the superior uptake of phosphate by M−HCC. Overall, M−HCC sorbent with the novel species of Ce 2 (CO 3 ) 3 ·xH 2 O as active site could be considered as a promising alternative for phosphate removal from waters or wastewaters.
研究领域:
环境科学
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水处理技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）