Desalination and Water Treatment
·
2024
·
IF 1
Wei-fang Chen,Weipeng Lu,Sijia Zhang,Xiaobing Xie,Fei-fei He,Zai Chen
Starting with sucrose and ferrous chloride, nanoparticles of iron encapsulated in carbon structure were synthesized using a carbothermal method. The effects of carbothermal temperature, treatment time, Fe:sucrose mass ratio on the properties of the nanoscale zero-valent iron supported activated carbon were investigated. Temperatures ranged from 500°C to 1,100°C and treatment time used was 0.5, 1 and 3 h. Mass ratios of Fe and sucrose were 1:2, 1:4 and 1:8, respectively. Materials thus obtained were mostly powdered. X-ray diffraction patterns indicate that zero-valent iron was successfully produced from reduction of iron oxides. Iron was incorporated into the carbon structure. Hexachlorobenzene was employed as the target substance to test the material’s application. The optimum synthesis condition which resulted in a more than 95% HCB removal was carbothermal temperature of 700°C, treatment time of 1 h and mass ratio of Fe:sucrose of 1:4.
研究领域:
环境化学
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材料科学
·
环境污染治理
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纳米材料
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环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 45
·51348
·
IF 3.125
Junming Chen,Jinxuan He,Longquan Liu,Yongzhu He,Xiaobin Huang
Polymeric ablative materials (PAMs) are widely used in spacecraft currently for thermal insulation. However, it is challenging to find a single filler that can improve both ablative and mechanical properties of PAMs. In this study, a new type of hybrid cross-linked polyphosphazene microspheres (PHC) is added to ethylene propylene diene monomer (EPDM) composites as a filler for the first time and its influence on the ablation, mechanical, and thermal properties of EPDM is investigated. The results show that the addition of 3 phr PHC increases the ablation performance by about 10% and enhances the mechanical properties by 20% approximately. In addition, the ablation mechanism is studied in accordance with SEM, FTIR, and Raman spectroscopy. On the one hand, PHC has the effect of catalyzing carbonization, thus increasing the rate of residual carbon; on the other hand, PHC changes the morphology of the char layer, forming a cross-linked structure containing P─O─Si bonds on the surface. The findings regarding catalyzing carbonization and the special char layer structure could guide the design of ablative materials.
研究领域:
高分子材料
·
航天热防护
·
复合材料科学
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材料化学
·
热力学
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 85
·期 11
·3259-3270
·
IF 2.43
Deng Peiyuan,Wang Guangzhou,Li Changkan,Dou Shentang,Yuan Wei
Nanoscale zero-valent iron-supported biochar pellets (nZVI)-(BP) were synthesized via liquid-phase reduction and applied to estrogen removal, including estrone (E1), 17 β -estradiol (E2), and estriol (E3). The performance of nZVI-BP, with respect to its characterization, removal kinetics, and isotherms, was investigated. The results showed that the adsorption equilibrium was reached within 10 min of exposure. The adsorption capacity of estrogen decreased with increasing solute pH and nZVI-BP dosage. The adsorptivity increased with increasing initial estrogen concentration. The estrogen behavior followed a pseudo-second-order kinetic model. The adsorption data of different initial estrogen concentrations fitted to Freundlich adsorption isotherms. In addition, a preliminary discussion of the adsorption mechanism of nZVI-BP for estrogens was provided. BP-supported nZVI was prepared to apply for removing estrogens. The proper reaction conditions were recommended for estrogen removal. The mechanisms of estrogen removal by BP-supported nZVI were probed.
研究领域:
环境科学
·
材料科学
·
污染控制
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Ying Li,Zhiquan Yang,Hongguo Zhang,Xiaowen Tong,Jinna Feng
An increasing amount of sewage sludge is produced by wastewater treatment plants worldwide. Therefore, the disposal of sewage sludge is one of the vital environmental issues currently. In the present work, we developed an alternative strategy of converting sewage sludge into porous activated carbon (SAC), and then synthesized a magnetically separable MnFe 2 O 4 -SAC heterogeneous catalyst through an environmentally friendly method. Several characterization techniques such as XRD, FTIR, SEM and XPS indicated the evidence of MnFe 2 O 4 nanoparticles successfully sticking to surface of porous SAC. The MnFe 2 O 4 -SAC composites exhibited stable and excellent catalytic activity in activating persulfate (PS) for the degradation of Orange G (OG) throughout the wide pH range of 3–9, and could be recycled by a magnet without any loss. The activation energy was calculated to be 14.94 kJ mol −1 , indicating that the OG degradation in MnFe 2 O 4 -SAC/PS process required moderate activation energy. The results of heavy metals leaching experiments revealed an excellent stability of the MnFe 2 O 4 -SAC catalyst. Possible reaction mechanism in MnFe 2 O 4 -SAC/PS system was also discussed in detail.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Zhixuan Fan,Tao Feng,Si Wu,Shuai Wang,Yi Tan,Qinghong Yu,Ranran Huang,Xinyue Zhang
The fast and efficient removal of organic pollutants (e.g., phenolics) remains one of the focus problems in environment pollution. Thus, a chitin-derived biochar with nitrogen doping (N-BC) was successfully prepared at a lower calcination temperature of 600 °C, which is environmentally friendly and energy saving. The N-BC was analyzed by SEM , FTIR , BET, XRD, XPS and Raman spectroscopy to confirm that the doping of nitrogen element provided sufficient defect sites to promote the activation of persulfate (PDS). Quenching experiments and EPR results revealed the presence of •OH and •O 2 − contributed to phenol degradation in N-BC 600/PDS system. In addition, the linear sweep voltammogram experiments also demonstrated the existence of electron transfer pathway. The electrons were donated from phenol and shifted to PDS through N-BC. The graphitic N and carbon defects in N-BC served as the active sites of the reaction and involved absorption and transfer of electrons as the key character. Moreover, the removal rates of phenol and TOC reached 98.8% and 58.2% within 2 h, indicating that N-BC effectively activated the persulfate to degrade phenol. This study provides the theoretical support and potential applications for the activation of persulfate by nitrogen-doped biochar to degrade other phenolic compounds .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jun Zhang,Longwei Li,Jili Zheng,Penglin Yang,Xuehong Wu,Chuanxiao Cheng,Jun Li,Yongjia Tian,Fan Wang
A coupling system combining Fenton process with dual rotating disk photocatalytic fuel cell (PFC) was developed to improve methyl orange (MO) removal and simultaneous electricity production, in which the (NH 4 ) 3 PO 4 modified bamboo charcoal (BC) was acted as cathode catalyst. Due to the existence of the N and P containing functional groups on the BC catalyst and the rotating electrode, the hybrid system could efficiently reduce oxygen to generate some hydroxyl radical and related species for MO removal. Therefore, Fenton-PFC-BC with rotation system showed a superior MO removal efficiency of 85%, 2.4 times higher than that in the traditional Fenton-PFC-Pt with aeration system. The radicals inhibition assays and hydrogen peroxide quantitative studies revealed that HO , h + and O 2 − were primarily responsible for MO degradation. Furthermore, the MO removal performance for Fenton-PFC-BC with rotation system was investigated at different parameters (such as rotating speed, BC loading, pH and ferrous ion concentration) to obtain optimal operation conditions. Results of energy analysis and reusability experiment showed that the proposed Fenton-PFC-BC with rotation system provided a cost-effective and stable method for the organic degradation and energy recovery.
研究领域:
环境科学
·
化学工程
·
能源技术
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Huilan Lian,Ping Xiang,Yinghao Xue,Yuzhu Jiang,Mengying Li,Jingyu Mo
The significant removal efficiency of microcystis aeruginosa was presented using Pt/Ti anode and activated carbon fiber/nickel foam (ACF/Ni) cathode by addition of Fe 2+ slightly in a wide range of initial pH (3–9). Results showed that about 93% of the Microcystis aeruginosa cells were removed within 15 min for Pt/Ti-ACF/Ni–Fe 2+ system. Dosage of Fe 2+ , current density, and initial pH had remarkable effects on the removal efficiency of microcystis aeruginosa. The mechanism of algae removal in the Pt/Ti-ACF/Ni–Fe 2+ electrochemical system was revealed by the comparison between Pt/Ti-ACF/Ni–Fe 2+ process and classical Fenton process, the analysis on Microcystis aeruginosa and ACF/Ni by SEM, the specific surface area and pore size analysis of ACF, and the determination of UV 254 , OD 620 and microcystin-LR (MC-LR). Results showed that the main mechanism of this system was the electro-Fenton process, which was accompanied by electro-adsorption, electro-floatation, and electro-coagulation process. And the cooperation mechanism on the electrochemical removal system was further speculated. With the breakdown of algal cells during the electrolysis, the MC-LR and other substances released from the cells were effectively degraded. Besides, the new cathode exhibited favorable and stable reusability . This study built up a high-efficiency algae removal system, which broke through the limits of narrow working pH range and large consumption of exogenous chemicals in electro-Fenton process.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Tianran Wang,Peitao Dong,Chushu Zhu,Pengxing Sha,Weiye Gao,Yulie Wu,Xuezhong Wu
Owing to the high mortality and infection rates of the Bacillus anthracis infection, commonly known as anthrax, the ability to detecting anthrax protective antigens (PA) is important in several domains, including food safety and bioterrorism. An ultrasensitive PA detection that employs a biosensor using a competitive method based on surface-enhanced Raman scattering (SERS) was developed herein. Au nanorod arrays (AuNRAs), conjugated with the PA-aptamer were prepared as substrates, whereas Au nanoparticles (AuNPs) were modified with 1,2-bis (4-pyridyl) ethylene (BPE) and PA as SERS tags. During detection, free PA and SERS tags bound competitively with active sites on the surface of AuNRAs. The Raman spectra of BPE were used to evaluate the limit of detection (LOD) for PA. Three enhanced Raman modes in this biosensor, namely AuNP self-enhancement, plasmonic resonance between single AuNP and AuNRAs, and nanogaps between two AuNP agglomerates and AuNRAs, were evaluated using the finite-difference time-domain (FDTD) method. Among AuNPs, AuNRAs and PA/BPE/AuNP/PA-apt/AuNRAs complex, the highest Raman signal of the Raman molecule BPE for the PA/BPE/AuNP/PA-apt/AuNRAs complex proved the existence of these three modes. Owing to the increased number of hotspots in biosensors, the ultra-sensitive detection of PA was achieved with an LOD of 1 pg/mL PA.
研究领域:
生物传感
·
食品安全
·
生物恐怖主义检测
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Bingxiang Liu,Tong Chen,Bing Wang,Shaoqi Zhou,Zihang Zhang,Yucheng Li,Xiaoxue Pan,Ning Wang
The sesame straw-derived biochar was successfully prepared via alkaline hydrogen peroxide (AHP) pretreatment in this study. Systematic experimental characterizations, 15 relevant batch and column adsorption models, combined with density functional theory (DFT) calculation were used to investigate the performances and micro-mechanisms of Cd 2+ adsorption onto biochar. We found AHP-pretreatment could greatly improve the adsorption performance of biochar for Cd 2+ . The maximum Cd 2+ adsorption capacity of AHP-pretreated biochar (87.13 mg g −1 ) was much larger than that of unpretreated biochar. Cd 2+ adsorption was mainly dominated by the chemisorption of the homogeneous surface monolayer. The hydroxyl and carboxyl groups on the surface of biochar provided preferential adsorption sites, and liquid film diffusion and intra-particle diffusion were two dominant rate-controlling steps. Our results showed that ion exchange, co-precipitation, surface complexation, and Cd 2+ -π interaction were the dominant adsorption mechanisms. Especially, DFT calculations well-identified that lone-pair electrons during complexation and π electrons during coordination were provided by oxygen-containing functional groups and aromatic rings, respectively. The experimental breakthrough curves fitted better with the theoretical value of the BJP model, compared to Thomas, Yoon-Nelson, and EXY models. Overall, our study provides a promising method for Cd 2+ removal from wastewater and resource utilization of agricultural wastes.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Shanshan Feng,Xun Cao,Wei Zheng,Xiuli Yue,Xiaoda Li,Shouzhu Li,Xinying Wang,Sheng Feng
The pollution of cesium ions (Cs + ) in radioactive wastewater has attracted an increasing attention, it is important to develop new materials for highly efficient removal of Cs + . In this study, Prussian blue/biomass activated carbon composites (PB/AC) were prepared by an cost-effective and facile strategy through controllable growth of Prussian blue nanoparticles (PB NPs) on the surface of soybean pods as a precursor of carbon matrix, and its physicochemical properties and Cs + removal performance compared with that of PB NPs grown on the surface of commercial activated carbon (PB/CAC). The results exhibited that PB NPs were uniformly dispersed on the surface of porous biochar. It was worth noting that PB NPs grafting towards porous biochar could avoid PB NPs aggregation, and thus enhanced the adsorption capacity of porous biochar to Cs + . The maximum adsorption amount of PB/AC reached up to 207.20 mg/g. In comparison with the PB/CAC, the adsorption amounts of PB/AC were elevated by 53.10 mg/g. Meanwhile, PB/AC also demonstrated significant high activity in a broad pH range from 4.0 to 10.0. Moreover, they still have high selectivity toward Cs + in the presence of competing ions like K + , Na + , Ca 2+ and Mg 2+ . In addition, the kinetic adsorption experiment showed that PB/AC reached adsorption equilibrium within 30 min. After three cycles of regeneration, PB/AC could maintain 99.01% of the original adsorption capacity. Besides, the MTT test and hematoxylin and eosin (H&E) staining showed that PB NPs had good biosafety , and the cell survival rate of HUVECs was still higher than 83.23 ± 6.41% after exposure for 24 h culture with high concentration of PB NPs (0.50 mg/mL). In brief, the low-cost and highly efficient PB/AC showed great removal efficiencies to Cs + in radioactive water.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Tian Yue,Yong Sun,Quanguo Zhang,Danping Jiang,Zhiping Zhang,Huan Zhang,Yameng Li,Yang Zhang,Tian Zhang
In this study, titanium dioxide/activated carbon fiber (TiO 2 /ACF) was synthesized by liquid-phase deposition method and the effect of TiO 2 /ACF on the performance of photo-fermentation biohydrogen production (PFHP) from corn stover under visible light catalysis was discussed. Results show the maximum cumulative hydrogen yield (CHY) obtained under the optimal conditions was 74.0 ± 1.3 mL/g TS with TiO 2 /ACF addition of 100 mg/L, which was twice that without TiO 2 /ACF addition (36.9 ± 1.0 mL/g TS). Initial pH value had the most significant effect on CHY. The addition of TiO 2 /ACF promoted the metabolic pathway of nitrogenase to reduce H + produced by consuming acetic acid and butyric acid to hydrogen, and also shortened the photo-fermentation period. By scanning electron microscopy and X-ray diffraction analysis, the morphology and phase structure of TiO 2 /ACF after PFHP did not change significantly. This study laid the foundation for the reuse of TiO 2 and its practical application in PFHP.
研究领域:
环境科学
·
生物能工程
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Linjie Li,Jiale Zhao,Xiaodan Zhao,Zuoming Zhou,Guohua Jing
Efficient and economical activator for enhancing peracetic acid (PAA) to generate reactive species is greatly critical for elevating the removal efficiency of the recalcitrant organic compounds in the water and wastewater treatment. Corn straw-derived biochar (CBC) is prepared by pyrolysis method with ample oxygen-containing functional group and defective structures working as an efficient electron transfer medium, which can promote PAA activation for the tetracycline (TC) degradation. In the CBC/PAA system, the TC degradation rate can reach 97.7 % within 30 min of reaction. The high performance of the CBC/PAA system is mainly attributed to the combined process of the free radical and the non-free radical pathway. According to the electrochemical experiments and density functional theory (DFT) calculation, carbonyl functional group (C=O) plays a crucial role for PAA activation. The electron-rich group C=O can not only transfer electrons from carbon networks and TC to PAA, but also provide electrons to directly activate PAA due to the presence of lone pair electrons. Moreover, the TC degradation pathways guided by radical and non-radical mechanisms are elucidated, and the toxicity changes of intermediate products are evaluated. In this study, a low-cost and efficient process combining PAA and biochar based on electron transfer mechanisms is proposed, guaranteeing the rapid TC degradation.
研究领域:
环境科学
·
水处理技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）