ACS Nano
·
2022
·
IF 18.027
Jianjian Zhao,Aiyou Hao,Pengyao Xing
Intramolecular folding is a strategy to construct aryl chiral compounds with applications in chiroptical materials and asymmetrical catalysts. However, beyond polarity the role of solvent in controlling the folded chirality is ambiguous. Here, we report a simple folding protocol to build chiral benzimidazole skeleton with propeller chirality, which could be adaptive to chloroform (CHCl3) with high selectivity. Benzimidazole conjugated with diamino acid arms underwent folding driven by hydrogen bonds, exhibiting propeller chirality of which handedness could be tuned by the absolute chirality of amino acids. Reversible unfolding/folding behavior was realized by heating/cooling process, giving rise to the thermomediated chiroptical switch. Among up to 32 common solvents, chloroform exclusively inverted the propeller chirality. The geometry and hydrogen bonding sites of chloroform allow rearrangement of diamino acid arms into an opposite packing propensity. The chloroform behaves as an invasive linker between diamino acid arms to replace the pristine hydrogen bonds. This work reports the fabrication of chiral aryl compounds by simple folding, which shows the adaptiveness to the chloroform. It demonstrates that not only polarity but also the active participation of solvent could change the chirality and optical activities of small folded molecules.
研究领域:
有机化学
·
材料科学
·
分子生物学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Li Gong,Jingting Chen,Yao Hu,Kai He,Eric J. Bylaska,Paul G. Tratnyek,Feng He
Chloroform (CF) is a widely used chemical reagent and disinfectant and a probable human carcinogen. The extensive literature on halocarbon reduction with zerovalent iron (ZVI) shows that transformation of CF is slow, even with nano, bimetallic, sulfidated, and other modified forms of ZVI. In this study, an alternative method of ZVI modification─involving simultaneous sulfidation and nitridation through mechanochemical ball milling─was developed and shown to give improved degradation of CF (i.e., higher degradation rate and inhibited H2 evolution reaction). The composite material (denoted as S–N(C)–ZVI) gave synergistic effects of nitridation and sulfidation on CF degradation. A complete chemical reaction network (CRN) analysis of CF degradation suggests that O-nucleophile-mediated transformation pathways may be the main route for the formation of the terminal nonchlorinated products (formate, CO, and glycolic polymers) that have been used to explain the undetected products needed for mass balance. Material characterizations of the ZVI recovered after batch experiments showed that sulfidation and nitridation promoted the formation of Fe3O4 on the S–N(C)–ZVI particles, and the effect of aging on CF degradation rates was minor for S–N(C)–ZVI. The synergistic benefits of sulfidation and nitridation on CF degradation were also observed in experiments performed with groundwater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Chemistry Letters
·
2020
·Vol. 18
·期 4
·1441-1446
·
IF 5.922
Zhao Xudong,Chen Zhiguo,Che Mingda,Qiu Sha,Huang Renliang,Qi Wei,He Zhimin,Su Rongxin
Pollution of waters by chlorinated organic pollutants is difficult to clean using actual remediation methods because these pollutants are highly stable. For instance, chloroform (CHCl 3 ) is poorly reactive with common oxidants such as iron-activated persulfate, ozone and Fenton’s reagents. Therefore, there is a need to develop new oxidants. Here, we designed a new dechlorination system, in which tannic acid and NaOH work synergistically to activate persulfate. We tested the effect of temperature and concentrations of persulfate, NaOH and tannic acid, on chloroform removal from water. Free radical-quenching experiments were performed to identify active species. Results show that chloroform removal increased from 42.5 to 97.6 wt.% after the addition of 300 mg/L tannic acid in 0.4 M NaOH. Superoxide radicals (O
·− 2
) was primarily responsible for the degradation of chloroform in the persulfate/NaOH/tannic acid system, in which tannic acid reacts with persulfate to produce hydroperoxide. Hydroperoxide then reduces persulfate to generate sulfate radicals (SO 4 ·− ), and produces O
·− 2
. NaOH-activated persulfate produces hydroxyl radicals (HO · ), which can oxidize chloroform. This dechlorination system showed excellent degradation efficiency for recalcitrant halogenated compounds, making it a very promising candidate for practical applications.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2019
·Vol. 220
·期 9
·1800577
·
IF 2.622
Donghai Duan,Huijian Ye,Zhenggang Luo,Bo Han,Yafei Chen,Xiehong Cao,Wenxian Liu,Mingqiang Zhong,Lixin Xu
Efficient production of high-quality, functionalized graphene is highly desirable for large-scale applications of graphene. Herein, a route for producing high-quality, polystyrene (PS)-functionalized graphene is demonstrated via graphite exfoliation in chloroform with a heterobifunctional hyperbranched polyethylene, HBPE@Py@PS, as stabilizer. The HBPE@Py@PS, possessing a pyrene-functionalized hyperbranched polyethylene backbone and multiple PS side chains, is synthesized by combining chain walking polymerization and atom transfer radical polymerization techniques. It is confirmed that the HBPE@Py@PS can effectively promote graphite exfoliation in chloroform under sonication to render stable dispersions of high-quality graphene, with an exfoliation efficiency high as 15% and a monolayer proportion, 61%. Meanwhile, it can irreversibly adsorb on the exfoliated graphene surface based on the π–π stacking interactions, concurrently rendering PS-functionalized graphene that is fluorescent and highly dispersible in chloroform, with a film conductivity reaching 1100 S m −1 . The as-produced graphene may find its applications as nanofiller for various PS-based graphene nanocomposites.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xue Zhao,Fulin Zhang,Hao Chen,Ruiqing Sheng,Glib V. Baryshnikov,Hans Ågren,Xiaohai Zhou,Haibo Zhang
Chloroform, a superstar widely applied as solvent, extractant, refrigerating fluid and adhesive, faces storage risks and environmental pressures. Herein, a brand-new strategy for storing and enriching chloroform is designed. It is shown that stable boron organic polymers BOPs-S3 with excellent hydrophobicity can be facilely prepared by combining Na 2 [B 12 H 12 ] and amphiphilic HBPB-14 molecules. The unique molecular structure of such as prepared polymers endows strong affinity with chloroform. BOPs-S3 possesses an ultra-high adsorption capacity of 46.9 g·g −1 toward liquid chloroform, with a resulting gel that maintains a low volatilization rate. In addition, a stainless mesh coating with BOPs-S3 is shown to excellently remove chloroform vapor, likewise BOPs-S3 is shown efficient for removal of chloroform traces in water, with a residual amount lower than the allowable concentration in drinking water defined by the World Health Organization. This work provides a novel approach to store chloroform in transportation or other unstable conditions with unprecedented ramifications.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Xiaoyu Wang,Jiale Wang,Lijun Ji,Bin Wu,Kui Chen,Yanyang Wu
Wastewater containing DMF (N,N-dimethylformamide) and salt is generated in production of many chemicals and medicines. The composition of phase equilibrium should be known primarily for the recovery of DMF from salt-containing wastewater by solvent extraction. In this study, liquid–liquid equilibrium (LLE) and solubility data of water + DMF + chloroform in the presence of NaCl with various concentrations of 0, 2.5, 5.0, 7.5, 10.0, and 13.3 wt % and Na2SO4 with concentrations of 1.5 and 2.5 wt % were determined at T = 298.2 K and atmospheric pressure. Besides, the salt effect on the LLE data was investigated. Compared with the salt-free system, the salt led to an enhancement in the maximum DMF distribution coefficient by 13.4–102.6% for 2.5–13.3 wt % NaCl and 16.2–31.7% for 1.5–2.5 wt % Na2SO4, respectively. Since the distribution coefficient of water increased concurrently, the separation factor barely changed and the two-phase region expanded outward slightly. At the same salt mass fraction, the order of salting-out effect strength on extraction was Na2SO4 > NaCl, which was in good agreement with the Hofmeister series. The reliability of the experimental values was verified through the Eisen–Joffe equation. The NRTL thermodynamic model was applied to correlate the experimental data with a root-mean-square deviation less than 0.0062. The coherent consistency of the model parameters for the salt-free system was checked by topological analysis based on the Gibbs tangent plane test.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Ain Shams Engineering Journal
·
2022
·
IF 4.79
Muhammad Zaheer,Haris Naeem Abbasi
Supercapacitors are getting a lot of attention as high-performance energy storage devices that can find applications in multiple fields including high-power military devices and wearable or portable electronics. For a better supercapacitor device electrode plays a vital role and graphene is being widely studied as an efficient material for electrodes due to its large specific surface area of 2630 m 2 /g. However, the disordered alignment and the severe aggregation hinder the maximum utilization of its surface area. In this work nickel nitrate and chloroform treatments were used to improve the deposition of graphene on the current collector and to improve the substrate surface quality, respectively. In addition, the stacking technique is used to improve the overall energy storage capability of the device. The electrophoretic deposition (EPD) coating method was used to deposit graphene on the current collector. The important optimization was also performed in a KOH-based 3-electrode system and the chloroform treated and graphene-coated electrode showed an improved capacitance of 151 F/g at scan rate 0.01 V/sec as compared to the 126 F/g of the untreated sample. The graphene-coated electrode showed good cyclic stability with capacitance fading of ∼4.4 × 10 −6 %/cycle and a higher operating voltage up to 6 V has been achieved by utilizing the stacking method.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Environmental Chemistry Letters
·
2021
·Vol. 19
·期 4
·3511-3515
·
IF 9.027
Si Huimin,Che Mingda,Chen Zhiguo,Qiu Sha,Cui Mei,Huang Renliang,Qi Wei,He Zhimin,Su Rongxin
Chloroform is an harmful chlorinated hydrocarbon which is hardly degraded using actual dechlorination methods. Alternatively, carboxymethyl cellulose/zero-valent iron appears promising to degrade chlorinated hydrocarbons in water, yet actually carboxymethyl cellulose cannot inhibit the oxidation and sedimentation of iron ions under alkaline condition. Here, polyethylene glycol, a green and low-cost non-ionic polymer, was used as a stabilizer to synthesize polyethylene glycol-stabilized Fe/Ni nanoparticles (PEG-Fe/Ni) for removing chloroform from water in a wide range of pH, from 3 to 11. PEG-Fe/Ni was prepared by a stepwise liquid-phase chemical reduction, then added into groundwater to remove chloroform. Results show that polyethylene glycol can both reduce the particle size from 106.9 to 79.6 nm and prevent the oxidation and sedimentation of iron ions under alkaline condition. The removal efficiency of chloroform increased from 86.3 to 100% at pH 6 in the presence of polyethylene glycol, and slightly decreased to 95.4% at pH 11. The calculated rate constant ( k ) indicates that chloroform removal follows pseudo-first-order kinetics. Furthermore, the PEG-Fe/Ni also removed chloroform from real groundwater at pH 8 with an efficiency of 90.1% in 4 h, which is higher than that for Fe/Ni nanoparticles, of 41.7%.
研究领域:
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Qingyi Wei,Chaoying Pan,Tengfei Wang,Hongbin Pu,Da-Wen Sun
High-performance plasmonic substrates have recently attracted much research attention. Herein, a three-dimensional gold nanoparticles (AuNPs) spherical liquid array (SLA) with high “hot spots” and tunable nanometer gap by optimizing the proportion of AuNPs colloids over chloroform was synthesized based on a water–oil interfacial self-assembly strategy. The substrate demonstrated excellent surface-enhanced Raman scattering (SERS) performance using tetrathiafulvalene and rhodamine 6G (R6G) as probe molecules. With a simple extraction and soaking pretreatment process, the SLA exhibited high sensitivity for analysing triazophos on apple peels, with a limit of detection (LOD) of 0.005 µg/mL and recovery ranging from 96 to 110 %. Particularly, the chloroform produced an inherent characteristic peak at 665 cm −1 , which was used as the internal standard to correct SERS signal fluctuation, leading to an improvement of the corresponding coefficient R 2 from 0.97 to 0.99, thus improving the reproducibility. Therefore the SLA substrate possesses the potential for quantitative analysis of food contaminants.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano-Micro Letters
·
2024
·Vol. 17
·期 1
·1-18
·
IF 31.6
Liu Junchen,Liu Ji,Li Zhipeng,Zhao Liupeng,Wang Tianshuang,Yan Xu,Liu Fangmeng,Li Xiaomin,Li Qin,Sun Peng,Lu Geyu,Zhao Dongyuan
Chloroform and other volatile organic pollutants have garnered widespread attention from the public and researchers, because of their potential harm to the respiratory system, nervous system, skin, and eyes. However, research on chloroform vapor sensing is still in its early stages, primarily due to the lack of specific recognition motif. Here we report a mesoporous photonic crystal sensor incorporating carbon dots-based nanoreceptor (HMSS@CDs-PCs) for enhanced chloroform sensing. The colloidal PC packed with hollow mesoporous silica spheres provides an interconnected ordered macro-meso-hierarchical porous structure, ideal for rapid gas sensing utilizing the photonic bandgap shift as the readout signal. The as-synthesized CDs with pyridinic-N-oxide functional groups adsorbed in the hollow mesoporous silica spheres are found to not only serve as the chloroform adsorption sites, but also a molecular glue that prevents crack formation in the colloidal PC. The sensitivity of HMSS@CDs-PCs sensor is 0.79 nm ppm −1 and an impressively low limit of detection is 3.22 ppm, which are the best reported values in fast-response chloroform vapor sensor without multi-signal assistance. The positive response time is 7.5 s and the negative response time 9 s. Furthermore, relatively stable sensing can be maintained within a relative humidity of 20%–85%RH and temperature of 25–55 °C. This study demonstrates that HMSS@CDs-PCs sensors have practical application potential in indoor and outdoor chloroform vapor detection.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Wenju Liu,Zehua Bao,Yanmin Shen,Yajun Guo
In this work, ternary phase diagrams of telmisartan-saccharin (TEL-SAC) cocrystal in methanol, ethanol, and quasi-ternary sections of the quaternary system TEL-SAC–chloroform–methanol were determined at 298.15 and 308.15 K. The results show that the stable region of cocrystal is greatly biased towards SAC in methanol and ethanol; this is due to the large solubility difference between TEL and SAC. In the mixed solvent of chloroform and methanol, the cocrystal stable region appears at the center of the whole phase diagram when the mass fraction of chloroform is 80%, which indicated that the solubility difference between TEL and SAC in the mixed solvent was relatively small. Moreover, the solubility behavior of TEL-SAC cocrystal was studied and the results showed that the solution complexation model in methanol and ethanol was 1:1 + 1:2, and the complexation model in chloroform and binary mixtures of chloroform/methanol was 1:1.
研究领域:
药学
·
物理化学
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2015
·
IF 3.352
Jingying Pan,Jie Fu,Shuguang Deng,Xiuyang Lu
A study on extraction of 15 kinds of possible lignin degradation products from aqueous solutions was performed by evaluating the distribution coefficients of five different organic-H 2 O systems under different conditions. The experimental results show that the extraction of lignin degradation products from aqueous solutions achieved equilibrium within 30 min; the concentration of the extracted materials and the amount of extractant had a negligible effect on the distribution coefficients. Among the five kinds of extractants investigated in this work, n-butanol was the best solvent for extracting the lignin degradation products, and chloroform had a good selectivity for the extraction of aldehyde. The temperature greatly influenced the distribution coefficients because the distribution coefficients decreased considerably with the extraction temperature. These results provide insights for the degradation of the lignin in a two-phase system.
研究领域:
化学工程
·
生物化学
✓ 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）