CHEMOSPHERE
·
2015
·
IF 3.34
Hongyu Dong,Baoyu Gao,Qinyan Yue,Yan Wang,Qian Li
Impact of pH on coagulation–ultrafiltration (C–UF) process was investigated with respect to coagulation efficiency, floc characteristics and membrane fouling in this study. Ferric chloride (FeCl 3 ) and polyferric chloride with basicity of 1.0 and 2.2 (denoted as PFC 10 and PFC 22 ) were used as coagulants and Fe (III) species in them was measured by a timed complexation spectroscopy method. Floc properties under four pH conditions were evaluated using a laser diffraction particle sizing device. Ultrafiltration experiments were conducted by a dead-end batch unit. The results showed that organic matter removal efficiency was higher under acidic conditions than under other pH conditions and turbidity removal efficiency was higher under alkaline condition. At same pH, FeCl 3 containing higher monomeric and polymeric species (Fe a and Fe b ) had better organic matter removal and higher turbidity removal efficiency was obtained by coagulants with larger percentage of polymer or colloidal species (Fe c ). Flocs formed under acidic ranges were larger, weaker and looser. At pH 4.0, 7.0 and 9.0, flocs by FeCl 3 were larger and weaker than these by PFC 10 , followed by PFC 22 . In case of FeCl 3 and PFC 10 , acidic pH conditions were helpful to reduce membrane fouling. For PFC 22 , permeate fluxes were less sensitive to pH variations.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Lei Zhang,Mengyang Hu,Yujun Zhang,Jian Hou,Meizhi Zhang,Chang Gao,Wenming Fu,Hongsen Hui,Quan Liu,Huiying Ding,Zuhui Qin,Hongchang Pei,Hideto Matsuyama
To balance the permeability-selectivity trade-off effect of the polyamide nanofiltration membrane, interfacial polymerization regulation strategy is widely used to optimize the physicochemical structure of the polyamide film. In the present work, the compound additives of phytic acid and ferric chloride were added into the aqueous phase to regulate the interfacial polymerization process. On the one hand, a lot of piperazine monomers will be adsorbed around the phytic acid molecules due to the electrostatic interaction between phosphoric acid groups and amino groups. Meanwhile, the phytic acid molecules and ferric ions can form a complex in the piperazine solution, which results in a low diffusion rate of the other piperazine monomers without adsorbed on the phytic acid and ferric chloride complex due to steric hindrance. The synergistic effect of electrostatic interaction and steric hindrance leads to the optimized nanofiltration membrane with a thinner and looser polyamide structure. The best-performing nanofiltration membrane exhibits an approximately four-fold water permeance (28.4 L m −2 h −1 bar −1 ) compared with the controlled M0 nanofiltration membrane (6.5 L m −2 h −1 bar −1 ) without obviously sacrificing the Na 2 SO 4 rejection (96.9 %). This simple interfacial polymerization regulation strategy provides a novel insight for the preparation of high-performance NF membrane.
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
POLYMER
·
2019
·
IF 3.771
Xiaolong Li,Shang Gong,Le Yang,Feng Zhang,Lijin Xie,Zhu Luo,Xiaosong Xia,Jun Wang
A kind of poly(lactic acid) (PLA) material with rapid degradation capacity was prepared with ferric chloride (FeCl 3 ), it's degradation rate was more than 10 times higher than that of pure PLA. FeCl 3 forms stable chemical bonds with C and O, which weakens the ester bond and leads to rapid degradation of PLA immensely. The degradation process of modified PLA is greatly accelerated because the presence of Fe 3+ facilitates the first step of the degradation process. The thermal stability of the modified materials decreased greatly, and the PLA changed from a higher crystalline polymer to an almost non-crystalline polymer with increasing FeCl 3 content, which enhanced the degradation rate due to the reduced intermolecular force . In terms of the degradation performance, the modified materials containing 2.95 phr FeCl 3 possessed the best comprehensive performance.
研究领域:
材料科学
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 12
·2822
·
IF 4.2
Jian Xiao,Tingting Liu,Qiulu Chu,Chaoguang Yu,Yunlong Yin,Lei Xuan,Shufang Wu
Carboxymethyl cellulose (CMC) and polylactic acid (PLA) are recognized for their environmental friendliness. By merging them into a composite film, packaging solutions can be designed with good performance. Nonetheless, the inherent interface disparity between CMC and PLA poses a challenge, and there may be layer separation issues. This study introduces a straightforward approach to mitigate this challenge by incorporating tannin acid and ferric chloride in the fabrication of the CMC−PLA. The interlayer compatibility was improved by the in situ formation of a cohesive interface. The resulting CMC/TA−PLA/Fe multilayer film, devoid of any layer separation, exhibits exceptional mechanical strength, with a tensile strength exceeding 70 MPa, a high contact angle of 105°, and superior thermal stability. Furthermore, the CMC/TA−PLA/Fe film demonstrates remarkable efficacy in blocking ultraviolet light, effectively minimizing the discoloration of various wood surfaces exposed to UV aging.
研究领域:
材料科学
·
环境科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
CLEAN-Soil Air Water
·
2018
·Vol. 46
·期 12
·1800351
·
IF 1.338
Xueqian Wang,Langlang Wang,Zhentao Bian,Ping Ning,Ping Wang,Fei Wang,Yixing Ma
Removal efficiency of elemental mercury (Hg 0 ) over activated carbon (AC) modified with ferric chloride (FeCl 3 ) is investigated at low temperatures. The effects of impregnation concentration, reaction temperature, oxygen content, relative humidity, and hydrogen sulfide (H 2 S) on Hg 0 removal efficiency are investigated. The results indicate that the removal ability of Hg 0 can be significantly improved by the introduction of FeCl 3 . Furthermore, the FeCl 3 -modified AC exhibit the best removal efficiency toward Hg 0 when the concentration of FeCl 3 is 0.15 mol L −1 and reaction temperature is 50 °C. In addition, H 2 S shows a positive effect on Hg 0 removal, while H 2 O(g) can inhibit the removal of Hg 0 due to competitive adsorption. Fe 2 O 3 and C Cl are generated on FeCl 3 -modified AC (with FeCl 3 impregnation concentration of 0.15 mol L −1 ) catalyst and contribute to Hg 0 removal. Moreover, Hg exists mainly in the form of mercuric chloride (HgCl 2 ) and mercuric oxide (HgO) on the surface of the samples. Finally, the removal of Hg 0 is achieved through the following two pathways: by the reaction of Hg 0 with C Cl and reaction of Hg 0 with Fe 2 O 3 .
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2022
·
IF 4.119
Jingjing Sun,Shangqing Chen,Junfeng Wang,Yi Nie
The reduce of the silicon concentration to low level (<5 mg·L −1 ) from the reverse osmosis brine wastewater is challenging and desirable for the maintain the membrane life and performance, as well as the wastewater treatment costs. This work focuses on the removal of silicon from the reverse osmosis brine wastewater by adding FeCl 3 into the plant wastewater for simultaneous Fe(OH) 3 formation and silicon adsorption. The effects of pH, FeCl 3 dosing concentration, reaction time, and temperature on the silicon removal ratio were investigated. It was demonstrated that the silicon removal ratio could reach up to 94% and its residual concentration was 3.2 mg·L −1 , which met the require of water quality in the reverse osmosis system. These results showed that Fe(OH) 3 could effectively be formed by adding FeCl 3 and realize the efficient silicon removal from the reverse osmosis brine wastewater, even when chloride ion (Cl - ), sulfate anion ( S O 4 2 - ) and nitrate ion ( N O 3 - ) were present. Moreover, the adsorption thermodynamics, kinetics and isotherms during the process of the adsorption of silicon from the wastewater by Fe(OH) 3 were studied. The calculated adsorption capacity of silicon could reach 612.74 mg·g −1 , which was much larger than those of reported adsorbents. These results showed that the silicon removal process was spontaneously exothermic and mainly controlled by the physical adsorption and the monomolecular layer adsorption. This simple and cost-effective method could be used for the silicon removal from different kinds of Si-containing wastewater.
研究领域:
环境科学
·
废水处理
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yajun Hou,Shanshan Wang,Baojuan Deng,Yun Ma,Xing Long,Chengrong Qin,Chen Liang,Caoxing Huang,Shuangquan Yao
As an environmentally friendly lignocellulosic biomass separation technology, hydrothermal pretreatment (HP) has a strong application prospect. However, the low separation efficiency is a main factor limiting its application. In this study, the poplar components were separated using HP with ferric chloride and pH buffer (HFB). The optimal conditions were ferric chloride concentration of 0.10 M, reaction temperature of 150 °C, reaction time of 15 min and pH 1.9. The separation of hemicellulose was increased 34.03 % to 77.02 %. The pH buffering resulted in the highest cellulose and lignin retention yields compared to ferric chloride pretreatment (FC). The high efficiency separation of hemicellulose via HFB pretreatment inhibited the degradation of xylose . The hydrolysate was effectively reused for five times. The fiber crystallinity index reached 60.05 %, and the highest C/O ratio was obtained. The results provide theoretical support for improving the efficiency of HP and promoting its application.
研究领域:
生物质能
·
林业工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiang Ke,Shuxian Tang,Zhiyun Dong,Kai Ren,Peng Yu,Xinyuan Xu,Jiaojiao Yang,Jun Luo,Jianshu Li
Development of supramolecular adhesion systems from small molecules is a promising strategy to construct adhesives integrating synthetic simplification and sophisticated properties. Here, we report a facile and green one-pot strategy for fabricating a solvent-free and dynamic supramolecular adhesive via co-heating three readily available feedstocks, a natural small biological molecule (α-lipoic acid), a natural plant polyphenol (tannic acid), and ferric chloride. The adhesive is injectable and self-healing, which can work instantly and repeatedly on various materials (e.g., polytetrafluoroethylene (PTFE)) in diverse conditions (dry, underwater, pH < 7, various ionic environments, and even in vacuum) at room temperature, showing promising applicability in complex environments. The self-strengthening of the supramolecular network with time further improves the adhesion strength of the adhesive for the glass (from about 22 kPa to exceeded 300 kPa after 28 d). More importantly, the adhesive exhibits great potentials to be applied in biomedical fields with wet environments. This ready-to-use and high-performance supramolecular adhesive, constructed by natural small molecules via an extremely facile preparation method, represents a promising universal strategy for both dry and wet adhesion.
研究领域:
材料科学
·
生物学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2014
·
IF 3.96
Shenglei Sun,Zhonglian Yang,Xin Huang,Fan Bu,Defang Ma,Hongyu Dong,Baoyu Gao,Qinyan Yue,Yan Wang,Qian Li
Polyferric chloride (PFC) and epichlorohydrin–dimethylamine (DAM–ECH) with different PFC (as Fe 3 + )/DAM–ECH mass ratios (MR) and dose methods were used in the treatment of humic acid–kaolin (HA–kaolin) simulated water under different pH conditions. Coagulation performance, floc characteristics and membrane fouling of PFC/DAM–ECH in coagulation–ultrafiltration (C–UF) process were investigated in this study. Results showed that the optimum coagulation performance was achieved when PFC dose was 15 mg/L with PFC/DAM–ECH MR of 2:1 under pH 6.0. Opposite adding sequence (DAM–ECH/PFC) would reduce UV 254 (ultraviolet adsorption at 254 nm) and DOC (dissolved organic carbon) removal efficiency. Addition of DAM–ECH on the basis of PFC produced larger and stronger flocs with better regrowth ability. Proper dosage of DAM–ECH under certain coagulation condition could achieve the best coagulation performance and keep the UF membrane operating under a preferable status. Results of this study would be beneficial for application of composite coagulant PFC–DAM–ECH and DAM–ECH as coagulant aid in water treatment processes.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
高影响因子
LIQUID CRYSTALS
·
2024
·
IF 2.4
Luan Cui,Jiwei Wang,Guiyang Yan,Fan Liu,Keyi Wang,Yi Diao,Mingda Li,Fanbao Meng
Novel magnetic ionic polymers based on polyvinyl chloride ([PVCs][FeCl4]) with liquid-crystalline (LC) ordering were synthetised and characterised. The [PVCs][FeCl4] containing magnetic tetrachloroferrate ions were prepared with PVC, pyridyl LC monomers and FeCl3. Various devices and instruments were used to characterise the chemical structure, thermal behaviour, magnetic properties, and LC properties. The synthetised [PVCs][FeCl4] showed smectic LC phase and presented excellent thermal stability. Several magnetorheological (MR) fluids were prepared using [PVCs][FeCl4] as particles and silicone oil as carrier fluid. MR Effects and settlement stability were investigated. Under the condition of external magnetic field, the MR fluids showed Bingham flow characteristics, and the MR effect was enhanced with increasing FeCl4− content in the systems. Under the condition of magnetic field intensity of 80 kA/m and shear rate of 2.5 s−1, the magnetorheological efficiency of [PVCs][FeCl4] based MR fluids with particle concentration of 20% can reach up to 14.7. The excellent MR effect of [PVCs][FeCl4] was due to the strong coupling between the magnetic moment of the FeCl4− anion and the orientation of cationic LC primitive under the action of an applied magnetic field. Furthermore, the good settling stability of the MR fluids was due to the introduction of organic mesogens, PVC main-chains and the ionic components for the [PVCs][FeCl4] particles.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Ya Gao,Tong Yue,Wei Sun,Dongdong He,Chenglong Lu,Xinzhuang Fu
Acid recovering and iron recycling from pickling waste acid are the desired goal of the steel mills for current ecological requirements and economic benefit. This study proposed a novel method to treatment the pickling waste acid using extraction separation of ferric chloride and hydrochloric acid , following by the spray pyrolysis of ferric chloride stripping liquor. Comparing the Ruthner method, the significant technical advantages of this method is the lower treatment load and operating costs for the spray pyrolysis process, attributing to the reuse of most hydrochloric acid without iron powder neutralizing. Different extractants (TBP, CYC, IA, OA, and PA) are compared to extract ferric ion from high-concentration hydrochloric acid solution and the optimum conditions are researched. Spectroscopic analysis is performed to characterize iron state in extractants. For the stripped solution, spray pyrolysis is employed to produce high-purity Fe 2 O 3 fine particles, meanwhile hydrochloric acid is recovered for following pickling procedure. The results showed that the effect of CYC under lower O/A ratio was better than that of TBP, and the opposite occurred at higher ratios. Three-stage extraction efficiency can reach over 80% at O/A = 2:1. The final O/A ratio of 1:1 was chosen for the stripping of iron-loaded extractants. Raman and UV–visible found that it was [FeCl 4 ] - anion that existed in Fe-loaded TBP and CYC. Spray pyrolysis at 1000 °C can obtain fine pure Fe 2 O 3 and hydrochloric acid. Eventually, a feasible technological process was put forward to recycle all chemicals and achieve zero emission of water and solid waste in the whole process.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2021
·Vol. 9
·期 4
·652
·
IF 2.847
Huanong Cheng,Na Li,Rui Zhang,Ning Wang,Yuanyuan Yang,Yun Teng,Wenting Jia,Shiqing Zheng
The solubility of hydrogen sulfide in different mole ratios of ferric chloride and 1-butyl-3-methylimidazolium chloride ionic liquid (rFeCl3/[bmim]Cl,r= 0.6, 0.8, 1.0, 1.2, 1.4) at temperatures of 303.15 to 348.15 K and pressures of 100 to 1000 kPa was determined. The total solubility increased with the increase of pressure and the decrease of temperature. The solubility data were fitted using the reaction equilibrium thermodynamic model (RETM). The mean relative error between the predicted value and the measured value was less than 4%. Henry’s coefficient and the equilibrium constant of chemical reaction at each temperature were calculated. Henry’s coefficient first decreased and then increased with the increase of mole ratio, and increased with the increase of temperature. The equilibrium constant of the chemical reaction followed the same law as Henry’s coefficient. The chemical solubility was related to both Henry’s coefficient and the chemical equilibrium constant. H2S had the highest chemical solubility in FeCl3/[bmim]Cl at a mole ratio of 0.6 and a temperature of 333.15 K. The chemical solubility increased with the increase of pressure.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）