INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Afroza Akter Liza,Shihao Wang,Yanchen Zhu,Hao Wu,Lukuan Guo,Yungeng Qi,Fengshan Zhang,Junlong Song,Hao Ren,Jiaqi Guo
This study aimed to explore the synergistic mechanism of lignin chromophore modifications via UV treatment and to analyze the effects of mechanical treatments on LCNF properties for future uses. The procedure involved two steps: first, lignin's chromophore modification via UV illumination, and then the ball milling process was proceeded for 1 h, followed by high-intensity ultrasonic for 15–135 min. Characterization included preserved lignin content percentage, FTIR, UV–vis NMR, and color analysis for UV-modified samples, and to access the influence of mechanical treatment on LCNF samples further yield, zeta potential analysis, XRD, thermogravimetric analysis, atomic force microscopy, and scanning electron microscopy were performed. LCNFs S-120 demonstrated a zeta potential of −21.7 mV, indicating enhanced stability compared to the S-135 sample (−10.95 mV). The S-120 sample also showed the highest yield (74.02 %) and TGA at 391 °C. In XRD analysis, the S-120 sample demonstrated the highest CrI 64.3 %, than the S-15 sample (48.2 %). Preserved lignin in the LCNFs led to a slight reduction in crystallinity across all samples but improved thermal stability for all the prepared LCNFs samples. The UV and ultrasonication improved the homogeneity and durability of the LCNF samples, enabling a process that may be used to industries.
研究领域:
材料科学
·
林业工程
✓ 已验证
DOI
PubMed
高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Tian-Yang Zhang,Bin Xu,Shijie Yao,Yaru Hu,Kuangfei Lin,Hui Ye,Changzheng Cui
Pre-chlorination and UV disinfection are two common processes in drinking water treatment plants. Sulfamethoxazole (SMX), an antibiotic widely detected in source water, was selected as a precursor to study the conversion of chlorine/nitrogen species and DBP formation in pre-chlorination/post-UV process. The combined chlorine (mainly organic chloramines) produced in pre-chlorination of SMX can self-degrade and release free chlorine back again as pre-chlorination time goes on. With free chlorine dose increasing, the self-degradation rate of combined chlorine increased obviously. But the combined chlorine stopped self-degrading and remained stable around 1 mg-Cl 2 /L after adding 0.30 mM chlorine for 30 min. Post-UV treatment after pre-chlorination can enhance the degradation and achieve a complete removal of combined chlorine (including organic chloramines). Deamination occurred during pre-chlorination/post-UV process and deamination amount (-NH 2 ) per SMX concentration was 0.19 M/M. Radicals in this process had no obvious influence on chlorine/nitrogen species conversion. Direct chlorination of SMX had the lowest DBP formation potentials while the application of pre-chlorination and UV enhanced them. Compared with UV treatment only, dichloroacetonitrile formation potential of SMX reduced by 1.58 × 10 −3 mol/mol-SMX (17.37 μg/l) after pre-chlorination/post-UV treatment. During pre-chlorination/post-UV/final-chlorination treatment of SMX, Br − and natural organic matter can enhance DBP formation and toxicity-weighted values. Acid conditions showed a very high DBP risk, while alkaline conditions could cut this risk obviously, especially for the toxicity-weighted values of these DBPs.
研究领域:
环境科学
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水处理工程
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Zhiheng Zhang,Yaxiong Ji,Hao Lu,Tao Shen,Tianen Chen,Yuanhao Wang
Hydrogen isotope separation is essential in industrial and scientific applications. Traditional methods such as rectification and electrolysis are energy intensive and complex. In recent years, graphene oxide membranes (GOMs) have received widespread attention as a new type of membrane separation material. However, recent reports indicate that it has a lower permeability flux, which reduces its practicality. In this study, an innovative method for hydrogen isotope separation was proposed, utilizing hot vapor-air gap membrane distillation (HV-AGMD) with UV-treated GOMs. By adjusting the competitive relationship between the free diffusion of H 2 O/D 2 O and the adsorption-desorption mechanism, the osmotic flux is increased by about 10 times to 9.36 L·m −2 ·h −1 . This study also optimized the pH, concentration and GO dosage of the dispersion for preparing GOMs. These findings provide valuable insights for achieving cost-effective separation of hydrogen isotopes in water.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
npj Flexible Electronics
·
2018
·Vol. 2
·期 1
·1-7
·
IF 0
Bai Xiaopeng,Lin Sen,Wang Haolun,Zong Yi,Wang Haiyang,Huang Ziyun,Li Donglai,Wang Chang,Wu Hui
Ultrathin, patterned, conducting metallic fibers have been extensively studied as building blocks in flexible electronics. However, their scalable processing and attainment of patterns at room temperature is challenging. In this paper, we report on the patterning of ultra-long silver submicron fibers as woven mesh through the process of continuous draw spinning in the presence of ultraviolet (UV) treatment. The silver fibers can be directly intertwined on flexible substrates, such as polyethylene terephthalate (PET) and polyimide (PI). The as obtained silver submicron fiber mesh present excellent photoelectric properties ( T = 90%, R = 9 Ω sq −1 ) and outstanding flexibility and can be easily transferred on other surfaces. To demonstrate its application, flexible electrochromic smart window and infrared stealth film have been prepared.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）