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Effect of pyrolysis temperature on si release of alkali-enhanced si-rich biochar and plant response

Biochar 2021年第4期3卷 469-484页

作者： Meng Wang Negar D.Tafti Jim J.Wang Xudong Wang College of Chemical and Environment Science Shaanxi University of TechnologyHanzhongShaanxi 723001China School of Plant Environmental and Soil ScienceLouisiana State University104 Sturgis HallBaton RougeLA 70803USA College of Natural Resources and Environment Northwest A&F UniversityYanglingShaanxi 712100China

Recent studies have shown that silicon(si)dissolution from biochar may be influenced by the pyrolysis *** addition,the enhancement of biochar by treatment with alkali has been proposed to produce a si source that can be used for environmentally friendly plant disease *** this study,biochars from rice straw and rice husk pretreated with KOH,CaO and K_(2)CO_(3)and then pyrolyzed at 350,450 and 550°C were prepared to evaluate the effects of pyrolysis temperature on si release and plant uptake from alkali-enhanced si-rich *** si and dissolution si from the prepared biochars were assessed by different short-term chemical methods and long-term(30-day)release in dilute acid and neu-tral salt solutions,respectively,along with a rice potting experiment in *** both rice straw-and husk-derived alkali-enhanced biochars(RS-10KB and HS-10K2B,respectively),increasing the pyrolysis temperature from 350 to 550°C generally had the highest extractable si and increased si content extracted by 5-day sodium carbonate and ammonium nitrate(5dSCAN)designated for fertilizer si by 61-142%,whereas non-enhanced biochars had more extractable si at 350°*** alkali-enhanced biochars produced at 550°C pyrolysis temperature also released 82-172%and 27-79%more si than that of 350°C produced biochar in unbuffered weak acid and neutral salt solutions,respectively,over 30 *** addition,alkali-enhanced biochars,especially that derived from rice husk at 550°C facilitated 6-21%greater si uptake by rice and 44-101%higher rice grain yields than lower temperature biochars,non-enhanced biochars,or conventional si fertilizers(wollastonite and silicate calcium slag).Overall,this study demonstrated that 550°C is more efficient than lower pyrolysis temperature for preparing alkali-enhanced biochar to improve si release for plant growth.

关键词： silicon Biochar Extractable si si release Plant uptake

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Diatomite-incorporated hierarchical scaffolds for osteochondral regeneration

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Bioactive Materials 2024年第8期38卷 305-320页

作者： Cuijun Deng Chen Qin Zhenguang Li Laiya Lu Yifan Tong Jiaqi Yuan Feng Yin Yu Cheng Chengtie Wu Shanghai Key Laboratory of Anesthesiology and Brain Functional Modulation Clinical Research Center for Anesthesiology and Perioperative MedicineTranslational Research Institute of Brain and Brain-Like IntelligenceShanghai Fourth People’s HospitalSchool of MedicineTongji UniversityShanghai200434PR China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050PR China Department of Joint Surgery Shanghai East HospitalSchool of MedicineTongji University150 Jimo RoadShanghai200032PR China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200438PR China

Osteochondral regeneration involves the highly challenging and complex reconstruction of cartilage and subchondral ***(si)ions play a crucial role in bone *** research on si ions mainly focuses on bone repair,by using silicate bioceramics with complex ion ***,it is unclear whether the si ions have important effect on cartilage *** a scaffold that solely releases si ions to simultaneously promote subchondral bone repair and stimulate cartilage regeneration is critically ***(DE)is a natural diatomaceous sediment that can stably release si ions,known for its abundant availability,low cost,and environmental ***,a hierarchical osteochondral repair scaffold is uniquely designed by incorporating gradient DE into GelMA *** adding DE microparticles provides a specific si source for controlled si ions release,which not only promotes osteogenic differentiation of rBMSCs(rabbit bone marrow mesenchymal stem cells)but also enhances proliferation and maturation of ***,DE-incorporated hierarchical scaffolds significantly promoted the regeneration of cartilage and subchondral *** study suggests the significant role of si ions in promoting cartilage regeneration and solidifies their foundational role in enhancing bone ***,it offers an economic and eco-friendly strategy for developing high value-added osteochondral regenerative bioscaffolds from low-value ocean natural materials.

关键词： Diatomite si release Hierarchical scaffolds 3D printing Osteochondral regeneration

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