Polymers
·
2024
·Vol. 16
·期 23
·3347
·
IF 4.7
Chiara Botta,Corinna Maria Grottola,Davide Amato,Maria Rosaria Acocella
As an alternative to fossil-based polymers, polylactide acid (PLA) has stimulated a significant research effort in the past few years due to the demand for environmentally friendly products. Even though PLA is considered a sustainable or bio-based material, the long-term degradation in ambient conditions increases the volume of waste at end-of-life. To overcome this issue, PLA waste can be recycled to produce new manufactures; however, this approach does not always ensure the same mechanical properties as the original PLA. This study shows for the first time that adding biochar, a carbon material derived from biomass pyrolysis, enhances the processability and stability of composite recycled PLA. Composites are provided in 1, 2.5, and 5 wt% of the biochar filler, resulting in good processability, a higher modulus of up to 20%, and a higher stability to degradation in the presence of UV aging treatment with respect to the raw material. Additionally, DSC analysis shows a significant nucleation effect induced by the biochar that achieves 30% crystallinity from an essentially amorphous PLA.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Algal Research-Biomass Biofuels and Bioproducts
·
2024
·
IF 4.6
Shuo Shang,Wenlu Che,Yanpeng Li
Two types of biochar adsorbents, ZnCl₂-modified biochar (ZABC-5 and ZLBC) and H₃PO₄-modified biochar (HABC-5), were synthesized using algae powder and lake bloom algae. ZnCl 2 as activator can change the surface structure of algal biochar and increase the adsorption site. ZABC-5 exhibited superior adsorption efficiency, achieving a maximum removal rate of 98.68 % for Cr(VI), featuring a defined surface area of 34.58 m 2 ·g −1 . Furthermore, it demonstrated excellent regeneration performance, maintaining over 98 % removal rate for Cr(VI) after three cycles using HCl as the desorbing agent. The multifaceted adsorption mechanism of Cr(VI) removal by ZABC-5 encompassed pore filling, electrostatic interaction, redox reactions, surface complexation, and ion exchange. Response surface optimization determined the optimal adsorption conditions for ZLBC, yielding an actual removal rate of 76 ± 4 %. Life cycle assessment revealed that the production of 1kg ZLBC and its utilization significantly reduce environmental impact, and the global warming potential is 12.70 kg CO 2 -Eq, while remaining cost-effective. Overall, this work provides a precedent by using lake bloom algae to create biochar adsorbents, showcasing the effectiveness and sustainability of algal biochar for removing Cr(VI) from water bodies and aiding environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Junhao Huang,Zhangtao Li,Shengdao Shan,Malik Tahir Hayat,Jun Meng
The escalation of metal(loid) contamination in global water poses severe risks to ecological environment safety. Meeting the ‘pollution control with waste’ strategy, we utilized eco-friendly waste tea leaf extract and walnut shell to first fabricate a greenly synthesized nanoscale zero-valent iron impregnated walnut shell biochar (G-nZVI/WSB) for the simultaneous sequestration of cadmium (Cd), lead (Pb), and arsenic (As) from aqueous systems. Since the interactions among these metal(loid)s during adsorption on G-nZVI/WSB and their corresponding mechanisms remain unclear, we conducted a series of batch experiments coupled with characterization techniques. The optimal pyrolysis temperature and Fe/C ratio for G-nZVI/WSB were determined to be 650 °C and 20 %, respectively. Under optimal conditions (contact time = 24 h, pH = 6), G-nZVI/WSB exhibited theoretical maximum adsorption capacities for Cd(II), Pb(II), and As(III) of 52.96, 135.1, and 8.414 mg g −1 , respectively, which were significantly higher than those of WSB carrier. In single and combined systems, the monolayer and chemical adsorption of metal(loid)s were predominant, with their competitive affinity for active sites following the order of Pb(II) > Cd(II) > As(III). Characterization analyses using FTIR, SEM, XRD, and XPS confirmed the specific adsorption mechanisms of G-nZVI/WSB for these metal(loid)s, including cation-π interactions, coprecipitation, oxidation, and coordinated complexation. Notably, G-nZVI/WSB exhibited excellent adsorption stability over five cycles of adsorption-desorption, which achieved the efficient purification of multi-contaminated actual wastewaters to meet the standards for wastewater discharge or drinking water. These findings demonstrate the significant potential of G-nZVI/WSB as an eco-friendly and promising nanocomposite for treating metal(loid)-contaminated wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2020
·
IF 4.302
Junxiang Guo,Yuran Li,Jin Xiong,Tingyu Zhu
To clarify the effect of coking dust, sintering dust and fly ash on the activity of activated carbon for various industrial flue gas desulfurization and denitrification, the coupling mechanism of the mixed activated carbon and dust was investigated to provide theoretical reference for the stable operation. The results show that coking dust had 34% desulfurization efficiency and 10% denitrification efficiency; correspondingly, sintering dust and fly ash had no obvious desulfurization and denitrification activities. For the mixture of activated carbon and dust, the coking dust reduced the desulfurization and denitrification efficiencies by blocking the pores of activated carbon, and its inhibiting effect on activated carbon was larger than its own desulfurization and denitrification activity. The sintering dust also reduced the desulfurization efficiency on the activated carbon while enhancing the denitrification efficiency. Fly ash blocked the pores of activated carbon and reduced its reaction activity. The reaction activity of coking dust mainly came from the surface functional groups, similar to that of activated carbon. The reaction activity of sintering dust mainly came from the oxidative property of Fe 2 O 3 , which oxidized NO to NO 2 and promoted the fast selectively catalytic reduction (SCR) of NO to form N 2 . Sintering dust was activated by the joint action of activated carbon, and both had a coupling function. Sintering dust enhanced the adsorption and oxidation of NO, and activated carbon further promoted the reduction of NO x by NH 3 ; thus, the denitrification efficiency increased by 5%-7% on the activated carbon.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Dengfeng Wang,Zongqian Wang,Xianhong Zheng,Mingwei Tian
Activated carbon fiber (ACF) has broad application prospects in dyeing wastewater purification owing to its high specific surface area and hierarchical pore distribution. Natural fiber based ACFs is a group of emerging biomass adsorbent with attractive potential adsorbent properties. Herein, we develop a facile carbonization strategy to obtain a novel biomass ACF derived from the seed hair fibers of metaplexis japonica (MACFs), and the prepared MACFs possess hollow structure and the formation of graphite-like crystallites from MACFs is promoted by high temperature of carbonization. MACFs possess well-developed pore distribution, with a maximum specific surface area and total pore volume of 1882.003 m 2 /g and 1.613 cm 3 /g, respectively. MACFs exhibits the maximum adsorption capacity to be 943.372 mg/g for methylene blue (MB) fitting well with Langmuir model. Furthermore, MACFs can adsorb full solution of 90 mg/l by filtering only one time, proving its fast-adsorption performance. The high adsorption capacity and speed of MACFs are mainly attributed to three factors: high specific surface area and rich pores benefited from the full activation of hollow fibers, strong electrostatic attraction to MB provided by surface groups, and good contact with dye liquor. This work may shed light of the adsorption mechanism of biomass ACFs for the dyeing molecules and pave the way for the development of low-cost and highly efficient adsorbent.
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
Mingzhu Ren,Jing Wang,Zhengyang Wang,Sihan Sun,Jiakai Qiu,Yanchun Shi,Zhou-jun Wang,Yongbing Xie
Chlorobenzene is a typical toxic and persistent organic pollutant in wastewater and site polluted groundwater. In this study, powdered activated carbon (AC) was used for the adsorption of chlorobenzene from simulated wastewater, and it showed high adsorption capacity in a wide range of pH. Pseudo-second-order kinetic model and Langmuir isothermal adsorption model are suitable to describe the adsorption process . Furthermore, the adsorption mechanism is clarified by correlating the adsorption rate constants with the molecular descriptor by theory calculating. Chlorobenzene adsorption on AC was mainly controlled by π-π interaction and hydrophobicity , external mass transfer and intraparticle diffusion. Ozonation was adopted to regenerate the adsorption saturated AC and simultaneously avoid secondary solid waste. After three cycles of adsorption-ozonation, the adsorption capacity of AC even increased from 80 to 215 mg/g due to the increase of oxygen-containing functional groups on the AC surface. This mode can also be used for granular AC column adsorption, and ozonation partially restored the adsorption capacity. The work provides a better alternative way to deal with chlorobenzene polluted wastewater and groundwater.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Dian Lv
In this paper, air-dried lake sludge was pretreated by ball milling, and then pyrolysed at 600°C to prepare lake sludge-derived ball milling biochar, and Fe 3 O 4 was loaded on lake sludge-derived ball milling biochar by chemical precipitation. Scanning electron microscopy-energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and X-ray diffraction were used to investigate and characterize the adsorbents. The results demonstrated that ball mill pretreatment and Fe 3 O 4 -loaded can effectively increase the content of O-containing groups in the adsorbent. The batch adsorption experiments revealed that Cd(II) removal followed the pseudo-second- order kinetic model and the Langmuir model. Additionally, the Cd(II) maximum adsorption by biochar (BC), MBBC and Fe 3 O 4 @MBBC was 31.33, 47.36 and 92.42 mg/g, respectively. The Cd(II) removal mechanisms were complexation, ion exchange, co-precipitation and electrostatic interaction. The Cd(II) removal efficiency on Fe 3 O 4 @MBBC was maintained at 91.35% after 5 adsorption– desorption experiments, indicating that Fe 3 O 4 @MBBC had the ability to be better applied for the removal of Cd(II)-containing wastewater.
研究领域:
环境科学
·
材料科学
·
水处理技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Chenhui Yao,Yongqing Zhang,Meimei Du,Xiaodong Du,Shaobin Huang
Persistent organic pollutants (POPs) are widely distributed and have significant negative environmental impacts. Advanced oxidation processes (AOPs) based on sulfate radicals produced from persulfate (PS) have attracted considerable attention for the degradation of POPs, however, there are several disadvantages with these radical activation systems. This study examined the degradation of p -chloroaniline (PCA) by persulfate (PS) activated with activated carbon (AC). The effects of initial pH and dosage of AC were also investigated. Results showed that AC exhibits good catalytic activity toward PS. Increasing AC dosage significantly improved the PCA degradation rate but PCA removal was not obviously influenced by initial pH ranging from 3 to 9. PS activation in the PS/AC system was a non-radical process as demonstrated by (i) ethanol and tert -butyl alcohol having little effect on PCA removal and (ii) Electron Paramagnetic Resonance results showing no radicals signals in the PS/AC system. Results also demonstrated that TOC could be removed in PS oxidation and PCA dechlorination was rapid (in the initial 30 min). The three major intermediates identified during the PCA degradation in the non-radical oxidation process were N-(4-chloro-phenyl)-benzene-1,4-diamine, 4-chloro-phenyl-diazene and hydroquinone and two pathways of PCA degradation was proposed. This study proposes a new insights into the mechanism of PS activation by AC and an efficient method for POPs removal.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Chenyu Wang,Xiaolong Ling,Weibo Sun,Xiaohui Sun,Chao He
Sewage sludge (SS)-derived hydrochar by hydrothermal carbonization (HTC) have demonstrated its potential as an adsorbent. This study investigated the effect of HTC parameters and feedstock components on the adsorption performance of hydrochar, with the aim of enhancing its adsorption performance without modification, thereby expanding applications of waste-derived adsorbent under cost constraints. Water, ash and five model compounds were used to adjust the typical components of SS, then hydrochar was prepared under various HTC parameters. The adsorption quantity of the model pollutants (tetracycline and methylene blue) on hydrochar decreased with an increase in HTC temperature, and there was a minor decrease with prolonged reaction times. Changes in the HTC parameters did not affect the adsorption mechanism of the hydrochar. Notably, humus and lignin emerged as key components affecting the adsorption performance of hydrochars. Compared with the blank control, the adsorption capacities of tetracycline and methylene blue by hydrochar after the addition of 30 wt% humic acid increased by 16.1% and 101.0%, respectively. Moreover, the adsorption capacity of methylene blue increased by 58.5% after adding 30 wt% alkali lignin. The underlying mechanism was elucidated based on hydrochar characterization. Changes in HTC parameters affected the properties of hydrochar and its adsorption performance. The effect of component adjustment on the adsorption performance of hydrochar was attributed to abundance of oxygen-containing functional groups formed by the model compounds during hydrolysis. Component adjustment facilitated the binding of groups to the hydrochar, thereby offering more adsorption sites. This study provides a valuable reference for utilizing SS in the preparation of efficient and low-cost adsorbents.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2016
·
IF 2.078
Shungang Wan,Zulin Hua,Lei Sun,Xue Bai,Lu Liang
This investigation emphasized the optimum preparation conditions for the chemical modification of eucalyptus sawdust biochar as a potential biosorbent to promote the removal of nitroimidazoles from aqueous solutions. By ANOVA for central composite design of response surface methodology, we found the activation temperature and impregnation ratio of 85% H 3 PO 4 to sawdust as the significant factors for maximizing the adsorption capacity of metronidazole. Optimum activation temperature, impregnation ratio, and activation time were 500 °C, 0.62, and 90 min, respectively. The Brunauer–Emmett–Teller surface area and total pore volume increased from 32.80 m 2 g −1 to 882.04 m 2 g −1 and 0.01829 cm 3 g −1 to 0.4316 cm 3 g −1 after H 3 PO 4 activation, respectively. The removal efficiencies using biochar prepared at optimum conditions were 97.1% and 96.4% for metronidazole and dimetridazole at 20 mg L −1 concentration and 1.0 g L −1 biochar dosage within 2 h. The adsorption process was described well by pseudo-second-order model, and solute transfer was controlled by both boundary-layer and intraparticle diffusion. Thermodynamic study revealed that the adsorption process was spontaneous and exothermic. The Freundlich model presented better a fit for the adsorption equilibrium. The maximum adsorption capacities for metronidazole and dimetridazole were 167.5 and 200 mg g −1 , respectively.
研究领域:
环境科学
·
生物学
✓ 已验证
DOI
高影响因子
MATERIALS TECHNOLOGY
·
2014
·
IF 0.746
D. Zhang,B. Zhang,X. N. Tang,Y. P. He,G. C. Gao,P. Jiang
A new inorganic antibacterial material was synthesised by the sol–gel method using copper ion as antibacterial ion, holmium nitrate as additive and white carbon black as carrier. The structure and properties of the inorganic antibacterial material were characterised by inductively coupled plasma atomic emission spectroscopy, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) techniques, energy dispersive spectrum (EDS) analysis, X-ray diffraction (XRD) and antibacterial experiments (Escherichia coli as experimental bacteria). The result showed that the bacteriostasis rate of this new material was higher than that of the general Cu antibacterial white carbon black (without containing holmium); the bacteriostasis rate was over 90%. The form of the inorganic antibacterial material was investigated by XRD. The difference between the new inorganic antibacterial material and white carbon black was studied by FT-IR. Scanning electron microscopy and EDS were used to detect the holmium ion in the material.
研究领域:
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2023
·
IF 4.3
Wei Liu,Wei Zha,Hao Yin,Chunyan Yang,Ke Lu,Jianxin Chen
The objective of this work was to promote biobutanol production by integrating rare earth element stimulation, activated carbon adsorption and cell immobilization into acetone-butanol-ethanol fermentation. Among eight selected rate earth elements, the trace supplement of gadolinium (Gd(III)) into fermentation medium (1 × 10 −5 M) could significantly stimulate cell growth and biobutanol biosynthesis. Subsequently, activated carbon particles had been used to alleviate biobutanol toxic effect for bacterial cells. The adsorption of biobutanol on activated carbon particles was coincident with Pseudo-first-order dynamics and Freundlich isotherm models. In order to prevent the competitive adsorption between bacterial cells and biobutanol on activated carbon particles, bacterial cells bad been immobilized on the surface of volcanic stones. After cultivating for 5 h, activated carbon particles were introduced into fermentation broth for performing biobutanol isolation. Finally, the total biobutanol yield using the developed strategy was 15.26 ± 0.43 g/L, which was 73.20 ± 12.69% higher than that of common fermentation with free bacterial cells.
研究领域:
微生物学
·
生物工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）