CANADIAN GEOTECHNICAL JOURNAL
·
2024
·
IF 3
Xingxing He,Yong Wan,Yijun Chen,Xun Tan,Shiquan Wang,Xiaoli Liu,Qiang Xue
Soil organic matter (SOM) has always been one of the critical factors affecting the solidification of dredged soil. This study proposes a solidification/oxidization synergistic method for treating high organic dredged soil (DS). Three solid oxidants, i.e., sodium persulfate (PS), sodium percarbonate (PC), and potassium ferrate (PF), were added to DS in cooperation with cement, respectively. The results show that all three oxidants showed a good degradation effect on SOM and had the optimal dosage, which increased gradually with cement content (Ac) when used with cement. Under the optimal dosage of oxidant and Ac = 15%, PS and PC can improve the unconfined compression strength (UCS) of cemented DS (CDS) at 60 days of curing to nearly 4 times compared with that without oxidant, while PF can only increase the 60d-UCS to 1.5 times. In addition, the influence mechanism of different oxidants on the UCS of CDS was analyzed based on microscopic tests, proving that the three oxidants can not only degrade the SOM in CDS but also participate in the hydration reaction of cement. It is feasible to use proper amounts of PC and PS in combination with cement to solidify high organic soil.
研究领域:
环境工程
·
土木工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Xinyu Zhang,Wenyuan Zhu,Jiaqi Guo,Junlong Song,Huining Xiao
The degree of substitution (DS) of cellulose derivative is significantly associated with its properties. In this paper, a series of quaternary cellulose (QC) samples with different DS (ranging from 0.16 to 0.51) were synthesized with assistance of microwave and their relationship with strength improvement of fiber networks was investigated systematically. QCs were characterized by elemental analysis, FT-IR, 1 H NMR, and TGA , etc. The results showed that the cationic quaternary ammonium salt group was successfully grafted onto the backbones of cellulose chains and the thermal stability was associated inversely with the DS of QCs. However, the results of strength test for the fiber networks from secondary fiber of old corrugated containers showed that the tensile and burst strength was enhanced by addition of QCs, and their performance was positively correlated their DS. The best result achieved in this investigation was in the case of QC with DS of 0.51, with increments of tensile and burst strength 6.17% and 11.68%, respectively, at a dosage of 1.0 wt% based on oven-dry pulp. This investigation highlights the importance of DS of QC to its application in strength improvement for fiber networks.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Songzhi Li,Yang Guo,Hong Jiang,Huan Zhang,Jiayu Li,Yanli Chen,Jie Li,Xiangzhao Mao,Minxiao Wang
Arylsulfatase catalyzes the cleavage of sulfate ester bonds and plays a role in agar desulfation, thereby enhancing agar gel strength and quality. While studying the desulfurization pathway in Pseudoalteromonassp. SR43-6, a sequence encoding a potential arylsulfatase─Pseudoalteromonas Ars (Ps-Ars)─was found. The enzyme, with p-nitrophenyl sulfate as a substrate, exhibited optimal activity at 35 °C and pH 8.0. Its relative activity (206 U/mg) exceeded that of the recently identified arylsulfatases. Four hundred units of the enzyme removed 86.4% of sulfate groups from Gelidium amansii agar in 4 h, whereas 800 U of the enzyme removed 71.3% of sulfate groups from Gracilaria lemaneiformis agar in 8 h. After enzymatic treatment, G. amansii agar gel strength was enhanced by 32%, and a similar improvement was observed in G. lemaneiformis agar gel strength. Enzymatic agar desulfurization offers mild, quality-retaining, and environmentally friendly advantages, augmenting industrial application prospects.
研究领域:
生物化学
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海洋微生物学
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食品科学
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DOI
PubMed
高影响因子
Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 4
·790-808
·
IF 6.707
Nie Guanglin,Li Yehua,Sheng Pengfei,Zuo Fei,Wu Haolin,Liu Leiren,Deng Xin,Bao Yiwang,Wu Shanghua
In this study, the chemical precipitation coating (CP) process was creatively integrated with DLP-stereolithography based 3D printing for refining and homogenizing the microstructure of 3D printed Al 2 O 3 ceramic. Based on this novel approach, Al 2 O 3 powder was coated with a homogeneous layer of amorphous Y 2 O 3 , with the coated Al 2 O 3 powder found to make the microstructure of 3D printed Al 2 O 3 ceramic more uniform and refined, as compared with the conventional mechanical mixing (MM) of Al 2 O 3 and Y 2 O 3 powders. The grain size of Al 2 O 3 in Sample CP is 64.44% and 51.43% lower than those in the monolithic Al 2 O 3 ceramic and Sample MM, respectively. Sample CP has the highest flexural strength of 455.37±32.17 MPa, which is 14.85% and 25.45% higher than those of Samples MM and AL, respectively; also Sample CP has the highest Weibull modulus of 16.88 among the three kinds of samples. Moreover, the fine grained Sample CP has a close thermal conductivity to the coarse grained Sample MM because of the changes in morphology of Y 3 Al 5 O 12 phase from semi-connected (Sample MM) to isolated (Sample CP). Finally, specially designed fin-type Al 2 O 3 ceramic heat sinks were successfully fabricated via the novel integrated process, which has been proven to be an effective method for fabricating complex-shaped Al 2 O 3 ceramic components with enhanced flexural strength and reliability.
研究领域:
材料科学
·
陶瓷工程
·
增材制造
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）