APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Hailan Ji,Ganwei Zhang,Lei Teng,Jiale Xing,Xinying Jia,Haiying Luo,Shusu Shen,Xiaoji Zhou,Dapeng Liu,Ian Wyman
An asymmetric membrane for direct contact membrane distillation (DCMD) was first prepared with the ability to concentrate strongly acidic and alkaline solutions. The membrane was fabricated by a simple coating and non-solvent phase separation process. The successful preparation of the aramid-coated polyvinylidene fluoride (PVDF) asymmetric membrane was demonstrated by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS) characterization. Furthermore, it was verified via contact angle measurements that this modified membrane had better acid and alkali resistance than the pristine PVDF membrane at an elevated temperature. During the DCMD process, the pH of the permeate side did not fluctuate significantly when solutions with different pH values were used as the feed solutions, thus also demonstrating the excellent separation efficiency of the modified PVDF membrane. Moreover, the modified PVDF membrane exhibited a higher concentration factor for acidic and alkaline solutions than the pristine membrane. Therefore, it is believed that the modified membrane has great potential for application in DCMD process with the concentration of acidic and alkaline solutions.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 45
·21285-21292
·
IF 3.591
Tianci Wang,Yu Song,Wanna Zhao,Chunmei Zhou,Yuguang Jin,Xiaoyue Wan,Yihu Dai,Yanhui Yang
The oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is one of the most attractive reactions to establish a sustainable chemical process based on biomass resources. In this work, a CNT-supported ruthenium–manganese oxide nano-catalyst (RuO2/MnO2/CNT) was employed for the electro-catalytic oxidation of HMF in base-free aqueous solution. The activity test showed that α-MnO2 can effectively promote the activity of RuO2 in the oxidation of HMF. In comparison with RuO2/CNT, RuO2/MnO2/CNT possessed a lower activation energy and more than twice the FDCA formation rate. Under the optimized reaction conditions, the RuO2/MnO2/CNT catalyst afforded a FDCA yield of 72.1% in a 0.1 M K2SO4 aqueous solution at a 0.9 V (vs. Ag/AgCl) applied potential. To our knowledge, this is the first demonstration of FDCA formation as the primary product with high yield in an initially neutral electrolyte. The product FDCA can be easily separated after cooling the reaction solution to room temperature.
研究领域:
催化
·
化学工程
·
可持续化学
·
生物质转化
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 84
·期 12
·3576-3585
·
IF 1.915
Shen Chong,Zhang Qian,Meng Qin
Ultrafiltration membranes can intercept oil particles smaller than 10 μm, but the membranes are easily contaminated by oil due to their hydrophobicity. To treat various oily wastewaters, we prepared a hydrophilic hollow fiber membrane (HFM) with anti-fouling property by grafting sulfobetaine methacrylate (SBMA) onto polysulfone (PSU). For six simulated wastewaters containing emulsified oil at 1,000 mg/L, the PSU-g-SBMA HFM was able to remove 98.5–99.7% of oil, higher than that of PSU HFM at 91.1–98.9%. The oil concentration in filtrate was less than 15 mg/L, which could meet the discharge standard of wastewater. The water flux of PSU-g-SBMA HFM can be completely recovered after being washed by rhamnolipid and alkali solution, while the same cleaning process could not recover the PSU HFM. As found, the contact angles of oil droplets on the PSU-g-SBMA membrane were larger than those on PSU membrane, which indicated the improved hydrophilicity by PSU-g-SBMA. For 48 h of filtration to soybean and diesel oil/water emulsion, the effect of PSU-g-SBMA HFM was stable and the flux could be completely recovered by cleaning. Therefore, we provided a new method for oily wastewater treatment, which can efficiently and energy-saving remove various oil substances in wastewater. PSU-g-SBMA hollow fiber membrane could well remove >98.5% of various oil form wastewaters. RHA + NaOH solution could completely recover the water flux of the oil-contaminated PSU-g-SBMA hollow fiber membrane. Oil contamination on membranes was partly determined by the contact angles of oil.
研究领域:
环境工程
·
膜技术
·
水处理
·
高分子科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xuezhen Feng,Chao Wang,Shibin Shang,He Liu,Xujuan Huang,Jianxin Jiang,Haibo Zhang
The development of stimulus-responsive materials with multifunctionality is important for achieving bionic artificial intelligence. However, stimulus-responsive cellulose hydrogels that simultaneously change their shape and fluorescent color under a single stimulus are difficult to fabricate. Here smart, multicolor fluorescent cellulose hydrogels were prepared from cellulose, levofloxacin, epichlorohydrin, and lanthanide ions (Eu 3+ or Tb 3+ ). The hydrogels were incorporated with pan paper into synergetic color-changing and shape-morphing actuators (Eu-CLF and Tb-CLF actuators). Besides fluorescing with the metal ligands, levofloxacin possesses antibacterial activity. The fluorescence color of Eu-CLF hydrogel in Tb 3+ solution changed from red to yellow, whereas that of Tb-CLF hydrogel in Eu 3+ solution changed from green to red. Both the Eu-CLF and Tb-CLF hydrogels fluoresced blue and green in alkali and acid solution, respectively. The actuator thus achieves synergetic color-changing and shape-morphing under a single external stimulus (acidic/alkaline switching). Such an activator shaped like a bionic flower and an intelligent octopus-type soft robot with camouflaging ability were then prepared. This study provides an elegant strategy for developing advanced multi-responsive multicolor tunable behaviors for bionic soft robots, biosensors , and camouflaged robots.
研究领域:
材料科学
·
仿生学
·
人工智能
·
机器人技术
·
生物传感器
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2016
·
IF 3.997
Shenshen Ouyang,Tao Wang,Xueying Jia,Yun Chen,Juming Yao,Sheng Wang
A durable and renewable superhydrophobic and superoleophilic poly(m-phenyleneisophthalamide)/silicon dioxide (PMIA/SiO2) membrane was prepared for oil/water separation in harsh conditions, the membrane have a self-indicating capacity when it is to become inoperable. Its nanoroot-shaped micro-nanostructure was achieved by covering each individual electrospun PMIA/SiO2 nanofiber with a dense silicone nanofilament layer to form a superhydrophobic surface, the water contact angle was more than 150°and the sliding angle was less than 1°. The porous nanofiber network served as a substrate to ensure the high absorption capacity of oils and oil/water separation efficiency, and increase the roughness for hydrophobicity . Its superhydrophobicity, high separation efficiency, and excellent stability and durability in oil/water separations under various extreme conditions, such as high temperature, acid/alkali solutions, and seawater for long periods can be preserved. This behavior is attributed to the robust micro-nanostructure, superior corrosion resistance , and excellent mechanical properties . Congo red in the PMIA substrate acts as a color indicator to indicate superhydrophobic surface failure, and the disabled material can be recovered absolutely by in-situ regrowth of silicone nanofilaments. This material is expected to become a highly effective renewable and sustainable material for oil-spill cleanup and recycle.
研究领域:
材料科学
·
环境工程
·
化学
·
可持续性
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Junze Zhang,Tiandi Chen,Meng Zhu,Jian Lu,Xinlong Liu,Weiwei Sun,Mei Yi So,Bingang Xu
Fiber-based photochromic wearables have attracted growing attention in sustainable photo-patterning information displays, information security encryption, and optical data recording/storage. Molybdenum trioxide (MoO 3 ) is one of the key photochromic materials that possesses good photochromic performance, nevertheless, it faces considerable challenges in preparing photochromic textiles with stable, scalable, and long color-retention properties. In this work, a new kind of fiber-based photochromic wearables is designed and developed by combining cotton fabric with a MoO 3 -based self-adhesive polymer network and long chain silyl group. The prepared photochromic wearable has exhibited excellent fatigue resistance and favorable reversibility (> 40 cycles), rapid light response (reach color saturation with a UV dose of 60 kJ m −2 ), outstanding color retention capability (> 90 days), and desirable biocompatibility (cell viability > 100%). In addition, the prepared photochromic textiles could maintain a fast light response and excellent color retention even after experiencing repeated washing (20 cycles). Moreover, the photo-patterning photochromic wearables are verified by resisting the deterioration of acid solution, alkali solution, and sweat (pH 2.0–9.0) as well as keeping clear patterns under sunlight irradiation. As a demonstration of the application, fiber-based photochromic wearables are made and employed for the sustainable applications of rewritable photo-patterning and information security encryption.
研究领域:
材料科学
·
纺织工程
·
光电技术
·
信息安全
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 20
·14223-14233
·
IF 3.906
Yang Wang,Lijuan Liu,Pan Chen,Lina Zhang,Ang Lu
The physical dissolution of cellulose in aqueous solutions of tetramethyl ammonium hydroxide, triethylmethyl ammonium hydroxide, tetraethyl ammonium hydroxide, benzyltrimethyl ammonium hydroxide, benzyltriethyl ammonium hydroxide, NaOH and LiOH via freezing–thawing was investigated. Increasing the hydrophobicity of the cation greatly improved its dissolution capacity, leading to significant enhancement of cellulose solubility and stability against chain aggregation and gelation. The hydrophobic cations accumulated at the cellulose interface and decreased the surface tension, favouring dispersion of the disintegrated cellulose due to its amphiphilicity; this was consistent with molecular dynamics simulations. On the other hand, the solubility of cellulose followed the Hofmeister series, and cations with greater kosmotropicity originating from their greater hydrophobicity exhibited stronger dissolution power; this observed interaction pattern may be useful for further exploration and designation of novel solvents of cellulose. These aqueous quaternary ammonium hydroxides can be readily recycled and reused, which presents great potential in the green chemistry field.
研究领域:
材料科学
·
化学工程
·
绿色化学
·
物理化学
✓ 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）