Materials Research Express
·
2019
·Vol. 6
·期 4
·045509
·
IF 1.449
Haifeng Gao,Jianfang Wang,Ren Zhang,Lifang Wu,Cheng-an Tao,Guojun Deng
Aqueous Li-ion capacitors (ALICs) have been extensively studied in recent years due to their safety, environmental friendliness and low availability. In this paper, we constructed an ALIC using carbon-coated lithium iron phosphate (LFP) as the positive electrode, activated reduced graphene oxide as the negative electrode and studied its electrochemical performance in 1 M Li2SO4 electrolyte. Here, coating of LFP particles is carried out by dopamine polymerization to form a uniform carbon layer on the surface of the particles, which increases the conductivity and cycle performance of LFP. The optimal ALIC can achieve 82.8 F g−1 (based on the total mass of the positive and negative materials) at a current density of 0.2 A g−1, and shows good cycling stability. The specific capacitance can still retain 73% of the initial value after 1000 charge and discharge cycles. The specific energy density can reach 11.5 Wh kg−1 at a power density of 100 W kg−1.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jieru Yan,Xiaoxue Zuo,Shengjiong Yang,Rongzhi Chen,Tianming Cai,Dahu Ding
Combined pollution caused by organic pollutants and heavy metals pose a significant challenge to the adsorption process . In this study, iron-modified biochar (Fe-BC) was prepared by using ferrate (K 2 FeO 4 ) and wheat stalk as the precursors for the adsorption of copper (Cu 2+ ) and sulfadiazine (SDZ), especially under combined pollution scenarios. Iron modification not only enlarged the surface area but also loaded iron oxide nanoparticles on biochar surface. Accordingly, Fe-BC exhibited better adsorption capability of Cu 2+ and SDZ than the pristine biochar (BC). The corresponding maximum adsorption capacities of Fe-BC 700 were 46.85 mg g −1 and 45.43 mg g −1 towards Cu 2+ and SDZ, respectively. Interestingly, the adsorption was elevated in binary-pollutants system, suggesting a synergistic effect, which was probably attributed to the mutual bridging effects and complexation between Cu 2+ and SDZ. The loaded iron oxide particles could serve as a physical barrier to separate the adsorptions of Cu 2+ and SDZ and thus inhibited the competitive adsorption. Meanwhile, theoretical calculation demonstrated that sulfonamide group was the most probable binding site. Columns packed with Fe-BC 700 showed better performances for Cu 2+ and SDZ removal in binary system (635.73 BV for Cu 2+ and 4846.26 BV for SDZ) than in single systems (571.60 BV for Cu 2+ and 3572.06 BV for SDZ), which was consistent with batch adsorption experiments. These results demonstrated the potential application of Fe-BC 700 for simultaneous adsorption of Cu 2+ and SDZ and provided a cost-effective way for the remediation of organic and inorganic pollutants.
研究领域:
环境科学
·
污染治理
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 9
·2449-2456
·
IF 2.137
Changjiang Zhu,Mingshan He,Jianguang Cui,Qilong Tai,Lei Song,Yuan Hu
In this work, a novel hyperbranched and phosphorus-containing triazine derivative (HPCFA) is synthesized. HPCFA is used as charring-foaming agent and combined with ammonium polyphosphate (APP) as intumescent flame retardant to flame retard polypropylene (PP). PP/HPCFA/APP composite can achieve limited oxygen index value of 31% and pass UL 94V-0 rating by addition of 20 wt% HPCFA/APP (1/2, w/w). Besides, HPCFA is compared with another hyperbranched charring-foaming agent (HCFA). HPCFA and HCFA have similar chemical structure, and their only difference is that HPCFA has phosphorus-containing unit in the main chain compared with HCFA. HPCFA/APP system exhibits superior flame retardancy compared with HCFA/APP system. Char residue analysis demonstrates that HPCFA/APP system can form denser and more compact char layer in comparison with that of HCFA/APP system.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2013
·
IF 4.75
Dong-Zhi Chen,Jun-Yi Fang,Qian Shao,Jie-Xu Ye,Du-Juan Ouyang,Jian-Meng Chen
A novel entrapment matrix, calcium alginate (CA) coupled with activated carbon fiber (ACF), was prepared to immobilize Pseudomonas oleovorans DT4 for degrading tetrahydrofuran (THF). The addition of 1.5% ACF increased the adsorption capacity of the immobilized bead, thus resulting in an enhanced average removal rate of 30.3 mg/(L h). The synergism between adsorption and biodegradation was observed in the hybrid CA–ACF beads instead of in the system comprising CA beads and freely suspended ACF. The effective diffusion coefficient of the CA–ACF bead was not significantly affected by bead size, but the bead’s value of 1.14 × 10 −6 cm 2 /s (for the bead diameter of 0.4 cm) was larger than that of the CA bead by almost one order of magnitude based on the intraparticle diffusion–reaction kinetics analysis. Continuous treatment of the THF-containing wastewater was succeeded by CA–ACF immobilized cells in a packed-bed reactor for 54 d with a >90% removal efficiency.
研究领域:
环境生物学
·
微生物学
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Heyu Li,Zhe Sun,Shaochen Shang,Yan Cao
The development of cost-effective and reactive oxygen carriers and the fast and complete conversion of solid fuels are two critical issues in the solid fuel chemical looping technology. Red mud, a solid waste from the alumina industry, was found to be an economic oxygen carrier candidate simultaneously realizing the use of solid wastes and the CO 2 abatement after comparing with other two different iron-based materials (pure Fe 2 O 3 and hematite). This study validated red mud as an excellent oxygen carrier to achieve the almost complete conversion of char in solid fuels (SFs) (99.4%) and meanwhile the hydrogen production with high-purity (97% H 2 purity) and higher H 2 yield (around 500 mL/g), in the optimized pyrolysis procedure of solid fuels with proper gasification agent and rationalized reaction temperatures (1000 °C) and residence time (10mins). Characterizations of red mud using SEM-EDS and XRD revealed that the unique microscopic crystalline structures of both Fe 2 O 3 and Ca 2 Al 2 SiO 7 particles nested on Na 4 Al 2 Si 2 O 9 molten substrate, implying that the existence of Na-containing component of the red mud OC likely accounts for its higher reactivity and stability in multiple redox cycles.
研究领域:
能源科学
·
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 16
·3875
·
IF 4.2
Bojiao Yan,Xueqi Li,Xiaoyan Wang,Ping Yang,Hai Lu,Xiaoyu Zhang
Tetracycline (TC) contamination in water is one of the key issues in global environmental protection, and traditional water treatment methods are difficult to remove antibiotic pollutants.Therefore, efficient and environmentally friendly treatment technologies are urgently needed. In this study, activated persulfate (PS) using a biochar-loaded nano zero-valent iron (BC-nZVI) advanced oxidation system was used to investigate the degradation effect, influencing factors, and mechanism of TC. BC-nZVI was prepared using the liquid-phase reduction method, and its structure and properties were analyzed by various characterization means. The results showed that nZVI was uniformly distributed on the surface or in the pores of BC, forming a stable complex. Degradation experiments showed that the BC-nZVI/PS system could degrade TC up to 99.57% under optimal conditions. The experiments under different conditions revealed that the iron-carbon ratio, dosing amount, PS concentration, and pH value all affected the degradation efficiency. Free radical burst and electron paramagnetic resonance (EPR) experiments confirmed the dominant roles of hydroxyl and sulfate radicals in the degradation process, and LC–MS experiments revealed the multi-step reaction process of TC degradation. This study provides a scientific basis for the efficient treatment of TC pollution in water.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 7
·075303
·
IF 1.449
Weiwei Zhang,Hongjuan Wu,Weihua Meng,Mengjiao Zhang,Weiya Xie,Gang Bian,Hongqiang Qu
The flammability, poor mechanical properties, and high smoke production of poly(vinyl chloride) (PVC) have limited its practical applications in industry. In this work, activated carbon/phosphomolybdate 1-butyl-3-methylimidazolium (AC/PIL4) and activated carbon/phosphomolybdate 1-hexadecy-3-methylimidazolium (AC/PIL16) were prepared by direct precipitation and used to improve the flame retardancy and mechanical properties of PVC. Owing to their special structures and compositions, AC/PIL4 and AC/PIL16 triggered PVC crosslinking to form a dense char residue during thermal degradation, prevented smoke generation, and reduced heat transfer to protect the matrix. AC/PIL4-PVC exhibited the lowest peak heat release rate (179.0 kW m−2) and peak smoke production rate (0.091 m2 s−1), which are 45.7% and 75.2% lower, respectively, than those of pure PVC. Further, AC/PIL4-PVC and in particular AC/PIL16-PVC (which has long organic chains) can improve the mechanical properties of PVC. The impact strengths of AC/PIL4-PVC (10.76 kJ m−2) and AC/PIL16-PVC (12.25 kJ m−2) were 34.5% and 53.1% higher, respectively, than that of pure PVC (8.00 kJ m−2).
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 4
·892
·
IF 3.426
Rossella Arrigo,Mattia Bartoli,Giulio Malucelli
Biocomposites based on poly(lactic acid) (PLA) and biochar (BC) particles derived from spent ground coffee were prepared using two different processing routes, namely melt mixing and solvent casting. The formulated biocomposites were characterized through rheological, thermal, and mechanical analyses, aiming at evaluating the effects of the filler content and of the processing method on their final properties. The rheological characterization demonstrated the effectiveness of both exploited strategies in achieving a good level of filler dispersion within the matrix, notwithstanding the occurrence of a remarkable decrease of the PLA molar mass during the processing at high temperature. Nevertheless, significant alterations of the PLA rheological behavior were observed in the composites obtained by melt mixing. Differential scanning calorimetry (DSC) measurements indicated a remarkable influence of the processing method on the thermal behavior of biocomposites. More specifically, melt mixing caused the appearance of two melting peaks, though the structure of the materials remained almost amorphous; conversely, a significant increase of the crystalline phase content was observed for solvent cast biocomposites containing low amounts of filler that acted as nucleating agents. Finally, thermogravimetric analyses suggested a catalytic effect of BC particles on the degradation of PLA; its biocomposites showed decreased thermal stability as compared with the neat PLA matrix.Keywords:poly(lactic acid);biochar;melt mixing;solvent casting;rheological behavior;thermal properties
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Ningyuan Zhu,Chunquan Li,Lingjun Bu,Cilai Tang,Sichu Wang,Pengfei Duan,Lunguang Yao,Jun Tang,Dionysios D. Dionysiou,Yonghong Wu
An innovative advanced oxidation process was successfully developed to photocatalytic-degradation of estrone through the synergistic effect of biochar and Bi/Bi 2 O 3 in bismuth-containing photocatalytic biochar (BiPB). The highest reaction rate constant ( k obs ) of estrone degradation by BiPB was 0.045 min −1 under the conditions of initial concentration of estrone =10.4 μmol L −1 , [BiPB] =1 g L −1 , pH = 7.0. The k obs was almost tenfold and more than 20 times than that of biochar without bismuth impregnation and pristine Bi/Bi 2 O 3 , respectively. The best photocatalytic performance of BiPB composites for the degradation of estrone was primarily attributed to generation of OH radicals. Impregnation of bismuth helped control the concentration of persistent free radicals (PFRs) and develop a hierarchical porous structure of biochar. The presence of biochar facilitated pre-concentration estrone on BiPB and improved the separation and transfer efficiency of charge carriers. The synergistic effect between biochar and Bi/Bi 2 O 3 contributed to the generation of OH radicals for estrone degradation under neutral pH conditions. The transformation pathway of estrone was also proposed based on the measured transformation products in the presence of BiPB. The high efficiency of BiPB composites indicated that this easily-obtained material was promising for estrone-wastewater treatment applications as a low-cost composite photocatalyst.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Nanoelectronics and Optoelectronics
·
2020
·Vol. 15
·期 2
·219-225
·
IF 0.771
Wang Zhe,Li Wenyao,Zhang Kenan,Jiang Haishun,Ji Tao,Li Jiaojiao,Liu Jingjing,Han Weihua
The global abuse of antibiotics has led to many environment problems such as water pollution and drug-resistant bacteria. In this study, pure natural loofah was used as raw material to form powdered loofah activated carbon (LAC) after high temperature carbonization annealing, and sodium
alginate (SA) with gel ability was combined to prepare loofah activated carbon sodium alginate (LAC-SA) hydrogel sphere by external emulsification method. This work showed that the adsorption mechanisms of LAC-SA microspheres for the three antibiotics of ofloxacin (OFO), tetracycline (TC)
and norfloxacin (NFO) were in line by the psedosecond-order and the formula of Langmuir. The ofloxacin (OFO) antibiotic solution was used as a sample for cyclic adsorption experiment for 10 times and the cumulative adsorption amount exceeded 700 mg g–1.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Chemistry
·
2022
·
IF 3.241
Anxiang Huang,Wenlian Bai,Shoulu Yang,Zhongwei Wang,Nengying Wu,Yanxiong Zhang,Ning Ji,Dan Li
The purpose of this study was to fabricate a low-cost and eco-friendly adsorbent using bamboo biochar (BB), a kind of charcoal composed of high Brunauer–Emmett–Teller surface area and variety of functional groups, and chitosan as substrates for remediation of Cd(II) in Cd(II) contaminated water and characterized the functional group characteristics, surface morphology, and Cd(II) adsorption effect using the Fourier transform infrared (FT-IR), scanning electron microscope (SEM), and energy-dispersive X-ray spectrometer (EDS). Results showed that chitosan-modified bamboo biochar (CBB) provided more active adsorption sites (such as –NH2, –COOH, –OH, and C=O) on the surface to enhance the Cd(II) removal efficiency in Cd(II) contaminated wastewater. Meanwhile, the optimal pH, contact time, and dose of CBB on the Cd(II) removal efficiency are 7, 120 min, and 600 mg, respectively. In addition, the adsorption isotherm results revealed that the possible adsorption mechanisms might include surface adsorption, electrostatic adsorption, and ion exchanges. Furthermore, the maximum adsorption capacity (Qm) values predicted from the Langmuir model were 37.74 and 93.46 mg/g for BB and CBB, respectively, also indicating a potential application of CBB in practical wastewater. Desorption and regeneration of CBB were attained simultaneously and the results showed that even after five cycles of adsorption-elution, the adsorption and desorption of CBB exhibited a slight decline and still reached at 71.70% and 65.92%. Results from this study would provide a reference to functionalized CBB for Cd(II) adsorption in contaminated water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 17
·17373-17382
·
IF 2.914
Liu Xuewei,Gao Minling,Qiu Weiwen,Khan Zulqarnain Haider,Liu Nengbin,Lin Lina,Song Zhengguo
In this study, a novel Fe–Mn–Ce oxide-modified biochar composite (FMCBC) was synthesized via pyrolysis to enhance the adsorption capacity of biochar (BC). Scanning electron microscopy-energy-dispersive X-ray spectroscopy confirmed that Fe, Mn, and Ce were successfully loaded onto the surface of the BC. A series of adsorption experiments showed that the FMCBC exhibited improved adsorption of As(III) in an aqueous environment. The adsorption process was well expressed by the pseudo-second-order kinetic model. The adsorption capacity of FMCBC reached 8.74 mg L −1 , which was 3.27 times greater than that of BC. The pH of the solution significantly influenced the adsorption of As(III), where the amount of As(III) adsorbed by FMCBC was maximized at pH 3. A high phosphate concentration inhibited adsorption, whereas nitrate and sulfate ions promoted As(III) adsorption and increased the FMCBC adsorption capacity. Similarly, with increasing humic acid concentration, the adsorption capacity of FMCBC for As(III) decreased; however, a low concentration of humic acid promoted adsorption. X-ray photoelectron spectroscopy analysis revealed that the adsorption of As(III) by FMCBC occurred through redox and surface complexation reactions. Therefore, FMCBC has excellent potential for purifying arsenic-contaminated water.
研究领域:
环境科学
·
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）