REACTIVE & FUNCTIONAL POLYMERS
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2024
·
IF 4.5
Yi Sun,Guqing Xiao,Zijun Liu,Dan Wu,Li Xia
There are inorganic salts in glyphosate production liquor and natural water bodies coexisting with glyphosate. It is imperative to develop a salt-tolerant adsorbent for glyphosate in water. Industrial D113 resin undergone two-step transformation to optimize the preparation of D113 in-situ loaded with Fe 3+ (D113-Fe 3+ ) as salt-resistance glyphosate adsorbent. The loading amount of Fe 3+ on D113-Fe 3+ is 3.5 mmol/g. The adsorption mechanism revealed that Fe 3+ in D113-Fe 3+ formed Fe-O-P bond with the phosphonate group of glyphosate. At 293 K, the maximum complex ratio of the adsorbed glyphosate to Fe 3+ in D113-Fe 3+ was 2.4:1. At 293 K, the remarkable saturated glyphosate adsorption capacity of D113-Fe 3+ reached 1420.2 mg/g. In pK 2 state of glyphosate, D113-Fe 3+ featured its maximum adsorption capacity at the zero charge point 2.43 of D113-Fe 3+ and 293 K. In glyphosate solution coexisting 0–16 % NaCl, D113-Fe 3+ exhibited stable glyphosate adsorption capacity and salt-resistance compared with D201, D301 and 330 resin. The endothermic and spontaneous adsorption of glyphosate on D113-Fe 3+ can fit Freundlich model and pseudo-second-order model. 2 mol/L NH 3 ·H 2 O, 2 mol/L FeCl 3 and 2 mol/L H 2 SO 4 could all regenerate D113-Fe 3+ . The characteristics of salt-resistance and the remarkable saturated adsorption capacity made D113-Fe 3+ comparable to all reported glyphosate adsorbents.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Jiubing Zhang,Hongye Wu,Zhili Li
Traditional homogeneous Fenton systems face limitations, including a narrow pH range, potential secondary pollution, and poor repeatability. In this study, these bottlenecks in tetracycline wastewater treatment were addressed with using carbonized porous polyethyleneimine-grafted lignin microspheres (PLMs) supported Fe-loading catalysts (PLMs/Fe-C). An optimized PLMs/Fe-C catalyst under specific conditions (carbonization temperature: 350 °C, PLMs: Fe = 1:1, and alkali lignin: PEI = 1:4) was developed, which proved to be an efficient Fenton-like catalyst for tetracycline (TC) degradation. TC degradation results showed that the PLMs/Fe-C + H 2 O 2 system achieved a high removal efficiency of 100 % within 150 min (50 mL TC with an initial concentration of 50 mg/L, 0.015 g catalyst, 0.5 mL H 2 O 2 ), demonstrating its applicability over a wide pH range (3−10) and the capability to remove multiple pollutants (2,4-D, BPA, Lev, etc.). This efficiency was attributed to the stronger electron-donating ability and mass transfer properties derived from the porous structure and functional groups. Arrhenius fitting analysis revealed a lower activation energy (E = 52.98 kJ/mol) for the PLMs/Fe-C, indicating a more accessible reaction. Additionally, the removal efficiency marginally decreased from 100 % to 98.32 % after five cycles, demonstrating excellent reusability. Mechanistic investigations indicated that the PLMs/Fe-C can activate H 2 O 2 to produce reactive oxygen species •OH, 1 O 2 , effectively degrading TC.
研究领域:
环境科学
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催化材料
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废水处理
✓ 已验证
DOI
PubMed
高影响因子
MOLECULES
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2019
·Vol. 25
·期 1
·168
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IF 3.06
Chuang Zhang,Haichao Li,Chen Li,Zhengqiang Li
Methods to remove dye pollutants with natural enzyme, like horseradish peroxidase (HRP), are still limited due to high costs and low stability levels. The development of such a method with similar enzymatic activity is important and could be helpful in wastewater disposal. A metal organic framework material, Fe-loaded MOF-545 (Fe), was synthesized in our study as a new way to remove dyes due to its peroxidase-like activity. The structural characterizations of Fe-loaded MOF-545(Fe) was investigated using scanning electron microscopy (SEM), UV-Vis absorption spectra, and X-ray diffraction (XRD). The peroxidase-like (POD-like) activity of Fe-loaded MOF-545(Fe) was investigated under different pH and temperature conditions. Because of the Fe added into the MOF-545 structure, the absorption of Fe-loaded MOF-545(Fe) for acid (anionic) dyes (methyl orange (MO)) was better than for basic (cationic) dyes (methylene blue (MB)). The Fe-loaded MOF-545(Fe) could give a significant color fading for MO and MB over a short time (about two hours) with peroxidase-like activity. The remarkable capacity of Fe-loaded MOF-545(Fe) to remove the MO or MB is due to not only physical adsorption, but also degradation of the MO and MB with POD-like activity. Therefore, Fe-loaded MOF-545(Fe) has significant potential regarding dye removal from wastewater.Keywords:Fe-loaded MOF-545(Fe);peroxidase-like activity;dye absorption;dye degradation;wastewater
研究领域:
材料科学
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环境科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Kewang Zheng,Ling Xiao
Fe loading 3D micro-meso-porous carbon sphere (Fe@3C-2N) was derived from natural cellulose of sawdust and melamine through sodium alginate and ferric chloride cross-linking followed by carbonization processes, which served as peroxymonosulfate (PMS) activators for enrofloxacin (ENR) degradation. The cellulose was produced by the delignification of sawdust with sodium chlorite. The delignification of sawdust and the addition of melamine increased the porosity and electron transport capacity of Fe@3C-2N. When the dosages of Fe@3C-2N and PMS were 0.60 g L −1 and 0.20 g L −1 respectively, the degradation rate of ENR (20 mg L −1 ) reached 92.17 % within 80 min, suggesting the satisfactory activation performance of PMS. The good structural stability of Fe@3C-2N makes it suitable for use as packing in continuous flow reactors for wastewater treatment. Quenching experiments and electron paramagnetic resonance (EPR) suggested that SO 4 •− and 1 O 2 were the dominant reactive oxygen species (ROSs) in Fe@3C-2N/PMS system. X-ray photoelectron spectroscopy (XPS) revealed that Fe 3 C, pyrrolic N and graphitic N were the potential active sites.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Huali Zeng,Shaoyan Wang,Xiao Zhao,Baojie Liu,Zhiwei Zhang,Chengrong Qin,Chen Liang,Caoxing Huang,Shuangquan Yao
In particular, efficient oxidative demulsification is an effective method for oil–water separation. However, the inactivation of free radicals owing to the rapid release of transition metals is the main factor that reduces the effectiveness. In this study, a hydrophobic and lipophilic CP/SiO 2 @Fe 2+ composite aerogel was prepared using carboxymethyl cellulose as substrate, polyvinyl alcohol as reinforcement, and SiO 2 nanoparticles as hydrophobic modifier. The resulting aerogel had a water contact angle of 139°, oil absorption yield of 99.9 %, higher specific surface area 132.13 m 2 ·g −1 , low density of 0.021 g·cm −3 , and high porosity of 98.60 %. Fe 2+ was slowly released from the composite aerogel after efficient Fe 2+ loading of 65.77 mg·g −1 . The drug exhibited a low release rate of 87.72 % after 9 h, which was higher than that of the composite aerogel. This promoted the efficient presence of SO 4 − · activated from persulfate oxidation in the catalytic oxidative demulsification system over a long period. The green and efficient separation of oily-water was achieved by the synergistic effect of the adsorption of the hydrophobic and lipophilic composite aerogel and targeted and efficient oxidative demulsification. These results demonstrate the advantages of high separation efficiency, durability, stability of the CP/SiO 2 @Fe 2+ composite aerogel for oil–water separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）