Polymers
·
2019
·Vol. 11
·期 3
·546
·
IF 3.164
Yanbin Wang,Huang Yu,Yongchao Li,Teng Wang,Tao Xu,Jinxing Chen,Zicheng Fan,Yufeng Wang,Biaobing Wang
Highly conductive thin films with suitable mechanical performances play a significant role in modern electronic industry. Herein, a series of ternary conductive polymer composites were fabricated by incorporating carbon black (CB) into binary conductive polymer composites of poly(amide-imide) (PAI) and polyaniline (PANI) to enhance their mechanical and conductive properties simultaneously. By varying the composition of PAI/PANI/CB ternary films, the conductivity enhanced by two orders of magnitude compared with the sum of PAI/PANI and PAI/CB binary conductive polymer composites, and a high conductivity of 1160 S m−1was achieved. The improved conductivity is mainly because much more continuous conductive networks were constructed in the ternary conductive polymer composites. With the help of the unusual morphology, the tensile strength was also enhanced by more than 80% from 21 to 38 MPa. The origin for the improved morphology was discussed for further improvement.Keywords:conductive polymer composite;ternary blend;poly(amide-imide);polyaniline;carbon black
研究领域:
材料科学
·
电子工程
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ganning Zeng,Hanzhang You,Mingming Du,Yan Zhang,Yimei Ding,Chengda Xu,Bo Liu,Bing Chen,Xiangliang Pan
Remediating and controlling PAHs (Polyaromatic Hydrocarbons) contamination in the environment is essential all over the world. Nano-TiO 2 immobilized on large surface area adsorbent is a kind of emerging endeavor to enhance the photo-catalysis performance. In this paper, activated carbon samples (ACs) were synthesized by using a kind of subtropical macroalgae, i.e., Sargassum Horneri ( S.H. ) as raw material. ACs activated by FeCl 3 , ZnCl 2 , a composite activators mixture of FeCl 3 and ZnCl 2 (CA) were selected to immobilize nano-TiO 2 in aquatic environment, and naphthalene degradation performance of these materials was systematically assessed. The results showed that ACs could provide more activated space for naphthalene photocatalytic reaction, in which Zn 2+ helped to hold relative high specific surface area, Fe 3+ helped to extend the valid light responsive wavelength, and CA could take advantage of both metal ions, with the largest whole volume and surface functional groups. The highest naphthalene degradation efficiency of TiO 2 /AC-CA under simulated sunlight could arrive to 77.5%, while those of TiO 2 /AC-FeCl 3 and TiO 2 /AC-ZnCl 2 were 65.0%, 54.5%, respectively. Meanwhile, the pH-resistance and reusing capability of TiO 2 /AC-CA are better than those of other TiO 2 /ACs. The results helped to clarify the synergistic mechanism of AC and TiO 2 in photo-catalysis, especially the metal ions’ role in combining the two materials, and showed the industrial potential of S.H. in PAHs contamination.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2022
·
IF 8.91
Jianping Deng,Bing Li,Weizhao Yin,Huaitian Bu,Bo Yang,Ping Li,Xiangyu Zheng,Jinhua Wu
In this study, nano-sized silver oxides were loaded on activated carbon (nAg 2 O/AC) through a facile impregnation-calcination method for enhanced bacterial inactivation from drinking water , in which Escherichia coli ( E. coli ) was used as target bacteria. XRD and SEM characterization confirmed that nano-sized Ag 2 O particles (50–200 nm) were successfully prepared and uniformly distributed on the surfaces and pores of AC. Due to the structural reducing groups of AC, surface-bound Ag(I) was partially converted to Ag in the nAg 2 O matrix and the resulted Ag could sterilize E. coli directly. More importantly, surface-bound Ag could catalyze O 2 and H 2 O to generate reactive oxygen species (ROS) for oxidation sterilization, thus significantly enhanced the inactivation efficiency from 0.8 log 10 CFU/mL (nAg 2 O control) and 0.2 log 10 CFU/mL (AC control) to 6.0 log 10 CFU/mL in the nAg 2 O/AC system. The inactivation process was highly pH-dependent, and neutral pH was favorable for sterilization. A sterilization efficiency of 5.2 log 10 CFU/mL could still be achieved after 5 running cycles, indicating stable sterilization performance of nAg 2 O/AC. In addition, the nAg 2 O/AC also exhibited excellent renewability since a sterilization efficiency of 5.8 log 10 CFU/mL was obtained after nAg 2 O being stripped and reloaded on the AC. These results demonstrated that nAg 2 O-modified AC is an efficient material for sterilization in water treatment .
研究领域:
环境科学
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微生物学
·
材料科学
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Chengjiu Wang,Jixu Qiao,Jiandan Yuan,Zhentao Tang,Tianzhe Chu,Ruifeng Lin,Hongting Wen,Chuan Zheng,Hulan Chen,Haijiao Xie,Cheng Peng,Yuzhu Tan
In this study, the sorption properties of Cr(VI), As(III), and Pb(II) on chitosan-modified magnetic biochar (CMBC) derived from residues of Ligusticum chuanxiong Hort. were investigated. CMBC was found to be a valuable material for removing three heavy metals from water simultaneously. Kinetic analysis suggested Cr(VI), As(III), and Pb(II) were chemisorbed onto CMBC, while isotherm data conformed well to Langmuir model, the maximum adsorption capacity of CMBC was found to be 65.74 mg/g for Cr(VI), 49.32 mg/g for As(III), and 69.45 mg/g for Pb(II). Experiments, characterization, and density functional theory (DFT) calculations were employed to explore the mechanisms. Furthermore, CMBC demonstrated excellent removal rates of over 95% for Cr(VI), 99% for As(III) and Pb(II) from contaminated water bodies. This work shows that CMBC holds significant potential for wastewater treatment of heavy metals and provides an effective solution for the utilization of Chinese herb residues in environmental remediation.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
TEXTILE RESEARCH JOURNAL
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2025
·
IF 1.9
Yuanyu Ge,Tianye Chen,Yongsong Huang,Zhiying Li,Chao Zhang,Ziyin Li
Activated carbon fibers (ACFs) demonstrate exceptional performance across a range of applications, including environmental remediation and energy storage. However, significant challenges, such as high production costs and low yield, hinder their widespread adoption. In light of the substantial global generation and inefficient recycling of textile waste, this study aimed to enhance resource valorization and promote environmental sustainability through the conversion of waste textiles into activated carbon fibers (W-ACFs). The research successfully synthesized W-ACFs, which exhibit physical and chemical properties comparable to those of commercial activated carbon fibers (C-ACFs). When applied to the adsorption removal of lead ions in water, W-ACFs showed similar lead ion adsorption efficiency to C-ACFs at low concentrations. Although the adsorption capacity of W-ACFs reached approximately 70% (adsorption capacity of nearly 62 mg g−1) of that of C-ACFs at high initial concentrations, it nonetheless exhibited significant application potential. The production efficiency and adsorption performance of W-ACFs were further enhanced by optimizing key preparation parameters, including pre-oxidation temperature, carbonization activation temperature, and the dosage of chemical activating agents. This research not only provides an effective adsorbent material for water treatment but also introduces a novel approach to waste recycling and environmental remediation, thereby achieving the dual objectives of economic efficiency and environmental protection.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Frontiers in Energy
·
2024
·
IF 3.1
Zhang Chen,Zhang Duoyong,Zhang Xinqi,Tian Yongqiang,Wang Liwei
Mesoporous biochar (MC) derived from biomass is synthesized using a dual-salt template method involving ZnCl 2 and KCl, followed by impregnation with polyethyleneimine (PEI) of varying average molecular weights under vacuum conditions to construct a core-membrane structure for enhancing carbon capture performance. The resulting MC exhibits a highly intricate network of micropores and abundant mesopores, along with defects in graphitic structures, effectively facilitating robust PEI loading. Among the PEI-modified samples, PEI-600@MC demonstrates the highest CO 2 sorption capacity, achieving approximately 3.35 mmol/g at 0.1 MPa and 70 °C, with an amine efficiency of 0.32 mmol CO 2 /mmol N. The introduction of amine functional groups in PEI significantly enhances the sorption capacity compared to bare MC. Additionally, PEI with lower average molecular weights exhibits a superior sorption performance at low pressures but shows a reduced thermal stability compared to higher molecular weight counterparts. The area of sorption hysteresis loops gradually decreases with increasing temperature and average molecular weight of PEI. The equilibrium sorption isotherms are accurately modeled by the Langmuir equation, revealing a maximum sorption capacity of approximately 3.53 mmol/g at 70 °C and saturation pressure. This work highlights the potential of dual-salts templated biomass-derived MC, modified with PEI, as an effective, widely available, and cost-efficient material for CO 2 capture.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Wangsheng Yu,Lei Zhang,He Xu,Hui Wang,Xu Peng,Shengji Wu,Wei Yang,Jie Zhou
Recently, transition metal oxide-supported activated carbon (MO x /AC) has been extensively investigated for Hg 0 removal, due to its high Hg 0 adsorption capacity and reproducibility. Non-thermal plasma (NTP) was applied for the preparation of transition metal oxide-supported AC in this work. The obtained adsorbents were investigated for the removal of Hg 0 . The adsorbents were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), temperature-programmed reduction of H 2 (H 2 -TPR), and so on. The results indicated that the plasma treatment process instead of heat treatment could effectively promote the dispersion of active site and catalytic oxidation property of adsorbent. Consequently, the CeO 2 /AC-P and Co 3 O 4 /AC-P adsorbents prepared by plasma treatment exhibited higher Hg 0 removal efficiency than the CeO 2 /AC and Co 3 O 4 /AC adsorbents prepared by conventional heat treatment. The Hg 0 removal efficiency of the adsorbent could be recovered by the temperature-programmed desorption (TPD) process at a relatively mild regeneration temperature, while retaining high stability even at higher temperatures. The present work showed that plasma treatment could serve as an efficient method of preparing catalyst.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2020
·
IF 4.032
Quan Wu,Jia Guo,Bin Fei,Xinjian Li,Jun Sun,Xiaoyu Gu,Hongfei Li,Sheng Zhang
A novel polyhydroxy triazine-based charring agent, N-tris(hydroxymethyl)-amino triazine-piperazine copolymer (TTPC), was synthesized from piperazine, cyanuric chloride and tris(hydroxymethyl) aminomethane. The chemical structure of TTPC was characterized by Fourier transform infrared spectroscopy and 13 C solid-state nuclear magnetic resonance. TTPC, ammonium polyphosphate (APP) and zinc borate (ZB) were then introduced into polypropylene (PP) by melt compounding to improve the fire performance of the composites. The test results showed that the presence of 21% APP-TTPC-ZB with mass ratio of 16:4:1 could significantly reduce the peak heat release rate from 1547 to 230 kW/m 2 , increase the limiting oxygen index value from 18.0 to 29.6% and upgrade the UL-94 rating from no rating to V-0, accompanied by the elimination of melt dripping. The thermal stability and charring behaviors of the composite samples were investigated by thermogravimetric analysis . The results showed that TTPC was a highly efficient charring agent, and ZB could act as synergist in the intumescent system. Based on the comprehensive study of fire performance, char morphology and mechanical properties, it can be concluded that TTPC is a superior charring agent, especially compared with the generally used pentaerythritol.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Environmental Pollutants and Bioavailability
·
2019
·
IF 0
Yuehui Tan,Xianqiang Yin,Caiyun Wang,Huimin Sun,Aisheng Ma,Guilong Zhang,Nong Wang
The Cd(II) adsorption of kiwi biochar functionalized with Mg-Fe (3:1) layered double hydroxides (LDH) was studied. And the biochar was got via liquid-phase deposition, by incorporating Mg-Fe layered double hydroxide (Mg-Fe LDH) particles into kiwi biochar (KB/LDH). The batch of sorption experiments were studied, including adsorption kinetics and isotherm and the effects of pH, ion strength (IS) and co-existing ions. The KB/LDH composite showed a strong sorption ability to Cd(II) in aqueous solutions with the adsorption capacity of 25.6 mg g−1, compared with pristine biochar of 1.78 mg g−1. The adsorption of Cd(II) on KB/LDH composite increased with the decreasing of IS, decreased first and then grew larger with the increase of pH and was observed irrespective of the co-existence of K+, Cl− and NO3−. To sum up, the KB/LDH can be potentially used as an alternative adsorbent to amend the water and soil contaminated by Cd(II).
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
CHEMOSPHERE
·
2023
·
IF 8.8
Qingyi Zeng,Liu Yang,Qingyan Zhang,Tao Cai,Yumei Wang,Yuhan Cao,Junwen Lv,Zhu Xiong,Suqing Wu,Rena Oh
The utilization of bio-wastes, such as shaddock peels, is of great significance for sustainable development. Combined with the potential of peroxymonosulfate (PMS) based advanced oxidation process (AOP) in wastewater treatment , a highly efficient functional catalyst, derived from shaddock peels biochar (SPC) and embedded with CoO@Co nanoparticles , i.e. Co-SPC-x(y), was prepared using a facile impregnation-calcination method and used for refractory organics degradation with PMS. The decoration amount of Co and annealing temperature were optimized, and the effects of various reaction factors were investigated. The results indicated that the optimized sample of Co-SPC-10 (900) consisted of multilayer biochar with curly edges and highly dispersed CoO@Co nanoparticles in the range of 20–200 nm, which is in cubic metallic Co and CoO. Moreover, it also possessed a specific surface area of 248.6 m 2 /g, and exhibited excellent PMS activation ability with ∼100% chlortetracycline hydrochloride (CTC) removal ratio within only 12 min of operation. The Co-SPC-10 (900)/PMS system showed relatively high tolerance for HPO 4 2− , NO 3 − and SO 4 2− , while the Cl − and HA had considerable effects on it. Mechanism exploration results revealed that both radical and non-radical pathways existed in the Co-SPC-10 (900)/PMS system, in which the multilayered biochar functioned as an electron transfer carrier to facilitate the continuous cycle of Co 2+ /Co 3+ in the CoO@Co nanoparticles by reacting with the absorbed CTC and PMS, resulting in the production of •OH, SO 4 •− , O 2 •− and 1 O 2 . Additionally, the Co-SPC-10 (900) also showed good stability and catalytic oxidation performance for various refractory organics.
研究领域:
环境科学
·
材料科学
·
污水处理
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Zhenyu Chen,Lu Zhan,Zhenming Xu
Bromine removal is significant in the recycling of waste printed circuit boards (WPCBs). This study found that the critical factors limiting the debromination efficiency of conventional pyrolysis are the formation of coke impeding mass transfer and conversion of bromine into less volatile species, such as coking-Br and copper bromide. According to frontier molecular orbital analysis and thermodynamic equilibrium analysis, C–O bonds of resin are sites prone to electrophilic reactions and copper bromide in residue may undergo hydrolysis; therefore, introducing H2O during pyrolysis was a feasible method for thorough debromination. Through pyrolysis in a water vapor atmosphere, the diffusion limitation of debromination was overcome, and resin was converted into light components; thereby, rapid and deep removal of bromine was achieved. The result indicated that 99.7% of bromine was removed, and the residue could be used as a clean secondary resource. According to life-cycle assessment, pyrolysis of WPCBs in water vapor could be expected to reduce 77 Kt of CO2 emission and increase financial benefits by 60 million dollars, annually.
研究领域:
环境科学
·
化学工程
·
材料科学
·
可持续性
✓ 已验证
DOI
PubMed
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 4
·674
·
IF 3.06
Haodong Tang,Bin Xu,Meng Xiang,Xinxin Chen,Yao Wang,Zongjian Liu
Nitrogen-doped activated carbon (N-AC) obtained through the thermal treatment of a mixture of HNO3-pretreated activated carbon (AC) and urea under N2atmosphere at 600 °C was used as the carrier of Pd catalyst for both liquid-phase hydrodechlorination of 2,4-dichlorophenol (2,4-DCP) and gas-phase hydrodechlorination of chloropentafluoroethane (R-115). The effects of nitrogen doping on the dispersion and stability of Pd, atomic ratio of Pd/Pd2+on the surface of the catalyzer, the catalyst’s hydrodechlorination activity, as well as the stability of N species in two different reaction systems were investigated. Our results suggest that, despite no improvement in the dispersion of Pd, nitrogen doping may significantly raise the atomic ratio of Pd/Pd2+on the catalyst surface, with a value of 1.2 on Pd/AC but 2.2 on Pd/N-AC. Three types of N species, namely graphitic, pyridinic, and pyrrolic nitrogen, were observed on the surface of Pd/N-AC, and graphitic nitrogen was stable in both liquid-phase hydrodechlorination of 2,4-DCP and gas-phase hydrodechlorination of R-115, with pyridinic and pyrrolic nitrogen being unstable during gas-phase hydrodechlorination of R-115. As a result, the average size of Pd nanocrystals on Pd/N-AC was almost kept unchanged after liquid-phase hydrodechlorination of 2,4-DCP, whereas crystal growth of Pd was clearly observed on Pd/N-AC after gas-phase hydrodechlorination of R-115. The activity test revealed that Pd/N-AC exhibited a much better performance than Pd/AC in liquid-phase hydrodechlorination of 2,4-DCP, probably due to the enhanced stability of Pd exposed to the environment resulting from nitrogen doping as suggested by the higher atomic ratio of Pd/Pd2+on the catalyst surface. In the gas-phase hydrodechlorination of R-115, however, a more rapid deactivation phenomenon occurred on Pd/N-AC than on Pd/AC despite a higher activity initially observed on Pd/N-AC, hinting that the stability of pyridinic and pyrrolic nitrogen plays an important role in the determination of catalytic performance of Pd/N-AC.Keywords:activated carbon;hydrodechlorination;nitrogen doping;Pd
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）