INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Qianqian Tang,Hao Wu,Mingsong Zhou,Dongjie Yang
Presently, most studies on modified lignin focused on the adsorption to heavy metal cations, but rarely to Ca 2+ in hard water . Therefore, this work prepared a new gel-type lignin-based cationic adsorption resin (E-LSAF) through the crosslinking and curing of alkali lignin grafted by sodium sulfite sulfonated acetone to remove Ca 2+ in water. Under the determined optimum synthesis conditions, E-LSAF with a highest sulfonic group content of 1.99 mmol/g was obtained. Structural and physicochemical measuring results showed E-LSAF was a gel-type resin, owning strong hydrophilicity , high mechanical strength, excellent thermal stability and acid-alkaline resistance. Adsorption results indicated the adsorption of E-LSAF to Ca 2+ was well-fitted by Langmuir model, and the maximum adsorption capacity reached 45.8 mg/g. Pseudo-second-order model can describe this adsorption process well, suggesting it a chemisorption process. Dynamic column adsorption results showed E-LSAF could transform hard water into soft or even very soft water. The regeneration efficiency still maintained 80 % after 5 cycles. The adsorption mechanism was attributed to electrostatic attraction, ion exchange and complexation. This work provided a high-performance lignin-based cationic adsorption material with high adsorption capacity to Ca 2+ and excellent acid-alkaline resistance, which filled the research gap of using modified sulfonated lignin to remove Ca 2+ from water.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Tong Sun,Ziran Zhu,Zelin Qiu,Wushang Yang,Yani Jiang,Qianwei Su,Liheng Zhu,Zihao Zhao,Xiaojun Huang,Yunyun Xue,Jiacheng Qian,Baoku Zhu
To obtain positively charged layer and achieve high divalent cation rejection, a novel nanofiltration (NF) membrane was successfully fabricated by utilizing polyethyleneimine (PEI), newly fabricated polyacrolein (PA) and amine silane coupling agent γ-aminopropyl triethoxysilane (APTES). The PA was synthesized via radical polymerization to avoid the migration and volatilization of small molecule in the typical coating process, making NF membranes even with great stability. On the one hand, the PEI crosslinked with PA through Schiff base reaction; on the other hand, the in-situ hydrolysis self-polycondensation of APTES generated loose networks with Si–O–Si bonds which provided the permeation channel for water and accordingly boosted the water permeance. The water permeance of the optimal PEI/PA/APTES membrane could reach 16.9 L m −2 h −1 ·bar −1 and the Mg 2+ and Ca 2+ rejections were 98.8 % and 97.3 %, respectively, better than those of commercial NF membranes, breaking up the “trade off” effect. This study prepared a high-performance PEI/PA/APTES hybrid NF membrane oriented for hard water softening in tap water and brackish water via the non-interfacial macromolecule crosslinking coating method.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
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2019
·Vol. 23
·期 1
·109-118
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IF 1.672
Dan Fei,Guang-Wei Zhou,Zhou-Qiang Yu,Hong-Ze Gang,Jin-Feng Liu,Shi-Zhong Yang,Ru-Qiang Ye,Bo-Zhong Mu
Developing eco-friendly, nonirritant, low-toxic, and high-efficient surface active ingredients for detergents is an ongoing challenge in the detergent field. Surfactin is one of the representative lipopeptides produced by microorganisms. In this article, we report the surfactin isolated from cell-free broth of Bacillus subtilis HSO121 and purified by reversed-phase high-performance liquid chromatography for detergent formulations. The biodegradability, acute dermal irritation, acute oral toxicity (LD 50 and LC 50 ), surface activity, washing efficiency, and compatibility with hard water of the purified biosurfactant surfactin have been studied to explore the feasibility for applications of the surfactin in detergents. Acute oral toxicity tests (LD 50 > 5000 mg kg −1 , LC 50 > 1000 mg kg −1 ) and skin irritation tests (PII = 0) indicate that the surfactin is a low-toxic and nonirritant ingredient for detergent formulation. Moreover, the surfactin shows excellent surface and interfacial properties of emulsification and wettability, high compatibility, and stability in a wide range of temperatures, pH, and hard water and acceptable properties in biodegradability and foaming ability, which suggests that the biosurfactant surfactin is a promising ingredient for detergent formations in our daily life and for industrial applications.
研究领域:
微生物学
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环境科学
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化学工程
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DOI
高影响因子
DESALINATION
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2023
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IF 9.9
Jiazhou He,Tsai-Hsuan Chen,Kui Yang,Liang Luo,Chia-Hung Hou,Jinxing Ma
Brackish water desalination has become a major opportunity to fulfill the rising clean water needs globally. Capacitive deionization (CDI) is an attractive electrochemical separation technology to treat water salinity , and the innovative discharge operation, termed stop-flow (SF) discharge, has demonstrated high efficiency to minimize the brine volume. This work systematically compared the desalination performance of CDI when single-pass and SF discharge operation modes were respectively used. Results showed that while the SF discharge operation could achieve remarkably higher water recovery (>80 %), this inevitably resulted in the deterioration of CDI performance when the feed contained higher concentrations (5 mM) of Ca 2+ and SO 4 2− . Compared to the electrodes, the spacer and the desalination chamber could be more vulnerable to scaling in brackish water desalination. With the formation of glauberite and gypsum in SF discharge operation, the carbon materials from the electrodes constantly existed on the scaled spacer, which contributed to the blocking of the flow path and a significant increase in pressure loss. This study provides insight into the scaling mechanism for SF discharge in multi-cycle operation, which is crucial for the design of CDI materials and optimization of operating protocols for brackish water desalination.
研究领域:
环境科学
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水资源工程
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化学工程
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2025
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IF 5.2
Wei Wang,Mingan Zhou,Zhiqiao Wu,Hualin Lin,Bin Dai,Yuan Xue,Sheng Han
To cope with the problems of environmental pollution and resource waste of traditional mineral oil-based cutting fluids, this study optimized the performance of vegetable oil-based cutting fluids under hard water environment (hardness 450 mg L −1 , pH = 9) by response surface methodology (RSM), using soybean oil as the base oil and combining with Span 20 and Tween 80 composite surfactants. The experimental design used hydrophilic-lipophilic balance (HLB) value, surfactant concentration and soybean oil content as variables, as well as emulsion stability (particle size) and friction performance (wear scar diameter, WSD) as response values to construct a prediction model and verify its reliability. The results showed that the optimized cutting fluid formulation (HLB = 11.79, surfactant concentration 0.50 wt%, soybean oil content 10.06 wt%) exhibited excellent emulsion stability (particle size 573.8 nm, microscopically observed average particle size 2.48 μm) and friction performance (WSD = 0.506 mm) in the validation experiments. The emulsion has a lower coefficient of friction (25.7 % lower torque) and higher thermal conductivity than commercial cutting fluids. Microscopic characterization (DSC, rheological analysis) showed that its low-temperature fluidity and wettability were significantly better than that of pure water, and the contact angle was smaller. This research provided the theoretical and technological basis for the development of environmentally friendly and efficient hard water applicable cutting fluids to support the sustainable development goal of green manufacturing.
研究领域:
材料科学
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机械工程
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绿色制造
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表面化学
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润滑技术
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环境友好材料
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Quangang Cheng,Zihao Zhao,Ziran Zhu,Shaoqi Zhang,Liujian Wang,Chuyao Wang,Zheng Cao,Leyi Pan,Liping Zhu,Baoku Zhu
A fabrication strategy for positively charged nanofiltration (NF) membranes is proposed based on the blending system of amphiphilic copolymer poly(acrylonitrile-co-dimethylaminoethyl methacrylate) (AN-DMAEMA) and homopolymer poly(dimethylaminoethyl methacrylate) (PDMAEMA). The membrane is first cast by non-solvent induced phase separation (NIPS), followed by a 5 min annealing-crosslinking post-treatment to synergistically tailor its charge density and pore structure. This system enables the synergistic regulation of positive charge density and pore size of the separation membrane by tuning the blending ratio of PDMAEMA. Experimental results show that the optimized NADBPD-20 % membrane possesses a mean pore size (μp) of 0.84 nm and an isoelectric point (IEP) of 9.07, exhibiting a water flux of 9.56 L/(m 2 h bar) at 0.4 MPa, with rejection rates of 94.2 % and 95.1 % for MgCl 2 and CaCl 2 , respectively. At pH = 5, the rejection rates for poly(hexamethylene biguanide) hydrochloride (PHMB), chlorhexidine (CHX), and hexamidine diisethionate (HDI) reach 99.3 %, 98.4 %, and 93.0 %, respectively. The membrane shows excellent static antifouling performance against Bovine Serum Albumin (BSA) solution, with a flux recovery rate of 89.5 % after dynamic filtration fouling with BSA. Simulated wastewater treatment experiments validate its capability for simultaneous hard water softening and cationic disinfectants removal. Additionally, it maintains continuous filtration stability for 36 h during the filtration of a mixed solution of MgCl 2 and CHX. This study provides a feasible solution for the efficient removal of Ca 2+ /Mg 2+ and cationic pollutants in water bodies.
研究领域:
膜科学
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高分子化学
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水处理
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分离技术
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环境工程
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DOI
高影响因子
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