Applied Sciences-Basel
·
2022
·Vol. 12
·期 23
·12500
·
IF 2.838
Xiaoyan Wang,Lu Chen,Changfu Li,Yongchao Xiao,Yuchen Gao,Yaochun Liu,Yuanhua Lin,Junping Ding
Featured ApplicationThis work may provide potential applications in indoor air purification for the removal of volatile organic compounds.AbstractActivated carbon (AC) is one of the most used air purification materials with excellent adsorption capacity for volatile organic compounds (VOCs). In this work, Bi2O2CO3(BOC) nanomaterials, as a photocatalysis component, are grown on the surface of the AC to construct BOC/AC composites. The as-synthesized composites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and N2adsorption/desorption measurements. The results demonstrate that flower-like BOC can be grown in situ on the surface of AC. The photocatalytic properties for the removal of gaseous toluene (50.0 ppm) in air over the BOC/AC composites were investigated under simulated sunlight illumination. The results show that the BOC/AC photocatalyst can effectively degrade toluene to CO2and H2O, with more than 90% degradation in 3 h. The excellent photocatalytic performance of the BOC/AC composite catalyst can be ascribed to the synergistic effect of the adsorption ability of AC and photocatalytic activity of both BOC nanosheets and AC. This work may provide useful guidance for indoor air purification, particularly for harmful trace gases such as VOCs.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Hao Qian,Yi-Li Lin,Bin Xu,Li-Ping Wang,Ze-Chen Gao,Nai-Yun Gao
The adsorption of three haloforms (CHCl 3 , CHBr 3 and CHI 3 ) was studied using five different granular activated carbons (GACs), including acid washing carbon, coconut-shell carbon, briquetting carbon, coal and fibred carbon. The adsorption isotherms were fitted well using Freundlich model, and adsorption kinetics were fitted well using pseudo-second-order model. CHI 3 was adsorbed most efficiently, followed by CHBr 3 and CHCl 3 . Fibred carbon was the most efficient adsorbent for the studied haloforms. The adsorption capability of each GAC was calculated using the pseudo- second-order model which was then correlated to adsorbent properties. Generally, the surface area of GAC did not highly correlate to the amount of haloform adsorption. Highly positive correlations with methylene blue and iodine number were observed for CHBr 3 and CHI 3 adsorption capacity, but not for CHCl 3 . Micropores were correlated with CHCl 3 adsorption capacity. Moreover, three models, including intraparticle diffusion, Byod kinetic and diffusion-chemisorption were used to illustrate the mechanisms of haloform adsorption mechanism. Film diffusion was determined to be the rate-limiting process and haloforms were adsorbed via chemical adsorption. The results of adsorption rate and capacity are crucial for practical application of haloform removal via GAC process.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 98
·95656-95662
·
IF 3.289
Peipei Sun,Kaitao Zhang,Shibin Shang,Jie Song,Dan Wang
Hydrothermal carbonization (HTC) is an effective and sustainable way to covert biomass into functional carbonaceous materials. Effects of condition parameters on the morphology and particle size distributions were evaluated. However, the absence of porosity of HTC materials limits their wide applications. Activation of HTC materials could solve this problem. Traditional activation methods, which use strong base or acid as activating agent, could lead to pollutions. Here, we prepared microporous activated carbon spheres from ethyl cellulose under static air atmosphere. The resultant activated carbon spheres were characterized by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), FT-IR spectrometer, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and nitrogen adsorption. Results reveal that the obtained carbon spheres show smooth surface, good dispersion and abundant surface functional groups. In addition, the spherical carbon exhibits high adsorption abilities for different kinds of dyes, which is important for environment protection.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2022
·Vol. 76
·期 4
·2029-2039
·
IF 2.146
Tan Siwei,Ruan Xiaoying,Shao Ji,Shan Xiaoyue,Ye Haipeng,Shi Yanpeng
Self-produced peanut shell AC (activated carbon) and Al(OH) 3 (aluminum hydroxide) were successfully synthesized by ultrasound with CTAB (cetyltrimethyl ammonium bromide), and both new nanocomposite AC@Al(OH) 3 @CTAB were evaluated as adsorbents for absorption of BPA (Bisphenol A) and utilized for the determination of BPA in urine by high-performance liquid chromatography coupled with fluorescence detector. Then the AC and AC@Al(OH) 3 @CTAB nanocomposites were examined by X-ray diffraction spectra, infrared spectrum, scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy techniques and differential pulse voltammetry analysis. The extraction elements such as adsorption pH, time, dose, desorption solvent, elution method were also discussed. Under the optimized extraction condition, the recovery of BPA in urine sample can achieve to 99.5% when using AC@Al(OH) 3 @CTAB as the SPE (solid-phase extraction) absorbents. For the methodological analysis, the linearity was detected in the range of 0.2–50 ng mL −1 ( R 2 =0.999 3), and the limit of detection can be 0.05 ng mL −1 . Within-day and between-day relative standard deviations were less than 3.7 and 5.2%, respectively. The synthesized new nanocomposite (AC@Al(OH) 3 @CTAB) showed excellent absorptive capacity, and the proposed SPE-HPLC-FLD methodology was proved to be efficient, sensitive and operable when using AC@Al(OH) 3 @CTAB as absorbents for BPA detection in complicated biological samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Wei Su,Ping Liu,Changqing Cai,Hongzhi Ma,Bo Jiang,Yi Xing,Yunyi Liang,Liping Cai,Changlei Xia,Quyet Van Le,Christian Sonne,Su Shiung Lam
The dispersion of hyperaccumulators used in the phytoremediation process has caused environmental concerns because of their heavy metal (HM) richness. It is important to reduce the environmental risks and prevent the HM to reenter the ecological cycle and thereby the human food web. In this work, supercritical water gasification (SCWG) technology was used to convert Sedum plumbizincicola into hydrogen (H 2 ) gas and to immobilize HMs into biochar. The H 2 production correlated with temperature ranging from 380 to 440 ℃ with the highest H 2 yield of 2.74 mol/kg at 440 ℃. The free-radical reaction and steam reforming reaction at high temperatures were likely to be the mechanism behind the H 2 production. The analyses of bio-oil by the Gas Chromatography-Mass Spectrometer (GC–MS) and Nuclear magnetic resonance spectroscopy (NMR) illustrated that the aromatic compounds, oxygenated compounds, and phenols were degraded into H 2 -rich gases. The increase of temperature enhanced the HM immobilization efficiency (>99.2 % immobilization), which was probably due to the quickly formed biochar that helped adsorb HMs. Then those HMs were chemically converted into stable forms through complexation with inorganic components on biochar, e.g., silicates, SiO 2 , and Al 2 O 3 . Consequently, the SCWG process was demonstrated as a promising approach for dispersing hyperaccumulators by immobilizing the hazardous HMs into biochar and simultaneously producing value-added H 2 -rich gases.
研究领域:
环境科学
·
能源技术
·
植物学
✓ 已验证
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2014
·
IF 5.039
Cuiping Chen,Wenjun Zhou,Daohui Lin
N-nitrosodimethylamine (NDMA) is an emerging carcinogenic disinfection by-product in water environment. Biochars utilized as sorbents for the removal of NDMA from aqueous solution, and the sorption characteristics and mechanism were investigate. Biochars were prepared from bamboo, rice straw and wood sawdust at 300–700 °C. The pseudo-second-order model provided the best fit for the sorption kinetics of NDMA onto biochar and the sorption isotherms were described best with the Slips model. Biochar produced at 500 °C removed NDMA from aqueous solution relatively efficiently, and the bamboo char demonstrated the best sorption potential among the three types of biochars. Solution chemistry such as pH and metal ions did not show obvious effect on NDMA removal. Three sorption mechanisms are suggested for NDMA sorption onto biochars, H-bond attraction between N O and the O-containing moieties, hydrophobic force between CH 3 and the ordered graphitic structure, and partition process of NDMA into the non-carbonization part of biochar.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Mi Yan,Hongcai Su,Zhihao Zhou,Dwi Hantoko,Jianyong Liu,Jingyi Wang,Runpei Wang,Ekkachai Kanchanatip
The effluent of food waste (FWE) is generated during food waste treatment process. It contains high organic matter content and is difficult to be efficiently treated. In this study, the sample was collected from a 200 t/d food waste treatment center in Hangzhou, China. Subcritical and supercritical water gasification were employed to decompose and convert FWE into energy. The effects of reaction temperature (300–500 °C), residence time (20–70 min) and activated carbon loading (0.5–3.5 wt%) on syngas production and the remaining pollutants in liquid residue were investigated. It was found that higher reaction temperature and longer residence time favored gasification and pollutant decomposition, resulting in higher H 2 production and gasification efficiencies. It is noteworthy that the NH 3 -N was difficult to be converted and removed under current experimental conditions. The addition of activated carbon was found to increase the gasification efficiency. The highest total gas yield, H 2 yield, carbon conversion efficiency, gasification efficiency, total organic carbon removal efficiency and chemical oxygen demand removal efficiency were obtained from gasification at 500 °C for 70 min with 3.5 wt% activated carbon.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 4
·1956-1965
·
IF 3.119
Weiqi Xie,Shiwen Huang,Donglin Tang,Shumei Liu,Jianqing Zhao
A furfural-based DOPO-containing flame retardant, 6,6′-(((methylenebis(4,1-phenylene))bis(azanediyl))bis(furan-2-ylmethylene))bis(dibenzo[c,e][1,2]oxaphosphinine 6-oxide) (MBF-DOPO), was synthesized and utilized as a co-curing agent of 4,4′-diaminodiphenyl methane (DDM) for fire-safe epoxy thermosets. For the cured epoxy resin containing 4.0% MBF-DOPO, the limiting oxygen index (LOI) reached 32.9% (with the V-0 rating in UL-94 test), and the peak heat release rate and total smoke production values were respectively decreased by 29.3% and 33.6%, compared to pure epoxy resin. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) results confirmed that the furfural-based flame retardant MBF-DOPO promoted the charring formation of the epoxy matrix, which effectively isolated the gas and heat transfer during combustion and thus enhanced the fire-safety performance of the epoxy thermosets. This work provides an effective route for synthesizing a furfural-based flame retardant, which possesses great potential for application in fire-safe epoxy thermosets.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 30
·14427-14438
·
IF 3.925
Xinchen Chen,Yun Wang,Jianqi Lv,Zihao Feng,Yuting Liu,Hongtao Xia,Yang Li,Changfu Wang,Kai Zeng,Yan Liu,Dingzhong Yuan
Exploitation of bamboo-derived biochar offers a lucrative opportunity for using moso bamboo due to its short growth cycle, large quantity and universality. Novel MnO2 modified bamboo-derived biochar composites (MnO2@BBC) were successfully fabricated via a facile one-pot solvothermal reaction, and uranium(VI) adsorption experiments of MnO2@BBC were systematically performed under different pH values, adsorbent dosages, contact times, initial uranium(VI) concentrations and temperatures. Characterization analysis via Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photo electron spectroscopy (XPS) techniques and batch experiments demonstrated that MnO2 decoration could promote uranium(VI) adsorption by MnO2@BBC because of the increasing BET surface area (from 10.56 m2 g−1 to 63.50 m2 g−1) and more abundant oxygen-containing functional groups on the surface. The adsorption processes of uranium(VI) by MnO2@BBC were pH-dependent, endothermic (ΔH = 38.08 kJ mol−1 for MnO2@BBC-1) and spontaneous (ΔG < 0) in nature, and fitted to pseudo-second-order and Langmuir models. The maximum adsorption capacity of uranium(VI) by MnO2@BBC-1 was 97.40 mg g−1. As the primary mechanism of U(VI) adsorption by MnO2@BBC, inner-sphere surface complexation of U(VI) with the Mn–O in MnO2 or with the C–O and CO on the biochar surface was considered. Low-cost feedstock, simple preparation route and competitive adsorption capacity further highlighted the feasibility of MnO2@BBC for treating uranium-containing wastewater in practical application.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2022
·Vol. 45
·期 22
·4099-4106
·
IF 3.614
Suling Zhang,Ziluo Hua,Weixuan Yao,Ting Lü,Dong Zhang,Hongting Zhao
In this study, magnetic pomelo peel-derived biochar composite was fabricated and applied as a low-cost adsorbent for the simultaneous extraction of morphine-like opioids named morphine, codeine, and 6-monoacetylmorphine from wastewaters, prior to their determination via liquid chromatography-mass spectrometry. A total of four biochar products were synthesized under different pyrolytic temperatures of 400, 500, 600, and 700°C, respectively, and the 400°C biochar was found to have the greatest extraction ability, with enrichment factors of 34, 58, and 61 for the three drugs. The primary adsorption mechanism includes π-π interaction and H-bonding. Parameters affecting the extraction of opioids were optimized. Under optimum conditions (such as pH = 7; adsorbent amount = 15 mg; sample volume = 20 ml; eluent solvent, 200 µl of methanol), the method was proved to be linear in the range of 0.05–10.0 µg/L, with coefficients of determination greater than 0.99, and the limits of detection were 0.006–0.010 µg/L. In-batch and inter-batch precisions were 1.8%–6.5% and 4.8%–10.6%, respectively. The method was successfully applied to the determination of the target opioids in the samples of influent and effluent wastewater. The developed method by using magnetic pomelo peel-derived biochar could potentially be applied for the effective estimation of illicit drug consumption.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Martin Pivokonsky,Ivana Kopecka,Lenka Cermakova,Katerina Fialova,Katerina Novotna,Tomas Cajthaml,Rita K. Henderson,Lenka Pivokonska
The increasing occurrence of algal and cyanobacterial blooms and the related formation of algal organic matter (AOM) is a worldwide issue that endangers the quality of freshwater sources and affects water treatment processes. The associated problems involve the production of toxins or taste and odor compounds, increasing coagulant demand, inhibition of removal of other polluting compounds, and in many cases, AOM acts as a precursor of disinfection by-products. Previous research has shown that for sufficient AOM removal, the conventional drinking water treatment based on coagulation/flocculation must be often accompanied by additional polishing technologies such as adsorption onto activated carbon (AC). This state-of-the-art review is intended to serve as a summary of the most current research on the adsorption of AOM onto AC concerning drinking water treatment. It summarizes emerging trends in this field with an emphasis on the type of AOM compounds removed and on the adsorption mechanisms and influencing factors involved. Additionally, also the principles of competitive adsorption of AOM and other organic pollutants are elaborated. Further, this paper also synthesizes previous knowledge on combining AC adsorption with other treatment techniques for enhanced AOM removal in order to provide a practical resource for researchers, water treatment plant operators and engineers. Finally, research gaps regarding the AOM adsorption onto AC are identified, including, e.g., adsorption of AOM residuals recalcitrant to coagulation/flocculation, suitability of pre-oxidation of AOM prior to the AC adsorption, relationships between the solution properties and AOM adsorption behaviour, or AOM as a cause of competitive adsorption. Also, focus should be laid on continuous flow column experiments using water with multi-component composition, because these would greatly contribute to transferring the theoretical knowledge to practice.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Gao Wenran,Wang Ke,Wu Yishuang,Zhu Xun,Wu Yinlong,Zhang Shoujun,Li Bin,Huang Yong,Zhang Shu,Zhang Hong
Doping of heteroatoms into carbon materials is a popular method to modify their physicochemical structures and has been widely used in the fields of energy conversion and storage. This study aims to investigate the effect of doping atmosphere on the catalytic performance of nitrogen and sulfur co-doped biochar supported Ru in the production of phenolic monomers from lignin hydrogenolysis. The results showed that the catalyst prepared under CO2 atmosphere (Ru@CNS-CO2) was able to produce phenolic monomers from corncob lignin with a yield up to 36.41 wt%, which was significantly higher than that from the run over N2-prepared catalyst (Ru@CNS-N2). The characterization of the catalysts demonstrated that the CNS-CO2 support had a larger specific surface area, richer C=S and C-S groups, and higher oxygen content than CNS-N2, resulting in finer Ru particles and more Ru0 content on the CNS-CO2 support. The Ru@CNS-CO2 catalyst exhibited high activity in hydrogenation and fragmentation of β-O-4 linkages.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）