Nghiên cứu sử dụng sodium hypochilorite để thu hồi poly(3-hydroxybutyrate) từ chủng vi khuẩn yangia sp. nđ199 / Nghiên cứu sử dụng sợi PVA và sợi Bazan trong sản xuất tấm phẳng xi măng sợi

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Tác giả: Văn Thược Đoàn, Thị Hồi Lưu, Quý An Nguyễn, Văn Huynh Nguyễn, Xuân Thắng Ninh, Hữu Phong Trần, Minh Đạt Trịnh

Ngôn ngữ: vie; Vie

Ký hiệu phân loại: 660 Chemical engineering and related technologies

Thông tin xuất bản: Khoa học và công nghệ, Vật liệu và Xây dựng 20152021

Mô tả vật lý: 706-714, 15-19

Bộ sưu tập: Metadata

ID: 486607

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Polyhydroxyalkanoate (PHA) is a biodegradable polymer synthesized intracellular by many microorganisms. After extraction from the cells, they possess the common features of non-toxic, biocompatible, biodegradable and recyclable. These features render them highly competitive with polypropylene or other petroleum-derived plastics, especially in medicine. The recovery of PHA from bacterial cells is the key step of PHA production process. Many methods have been used for PHA recovery
these include solvent extraction, enzymatic hydrolysis, and chemical digestion. In this study, the chemical digestion method was used for recovery of poly(3-hydroxybutyrate) (PHB) from Yangia sp. ND199. Among various chemical tested (NaOH, HCl, KOH, NaOCl and SDS), NaOCl was found as an efficient chemical for PHB recovery PHB from Yangia sp. ND199. The optimal recovery condition was a ratio of 1:1 (v/v, solution containing 100 g/l bacterial cells and solution containing 6 percent NaOCl), at 30oC for 1h. Under such conditions, a purity of 99 percent and a recovery yield of 94 percent were obtained. This purification method is simple and can be developed and used for pilot scale.Tấm xi măng-sợi được chế tạo từ các nguyên liệu chính là xi măng Poóclăng hỗn hợp, bột giấy, phụ gia khoáng hoạt tính meta caolanh và sợi PVA hoặc sợi bazan trên hệ thống thiết bị thí nghiệm tạo mẫu tấm phẳng xi măng-sợi theo mô hình công nghệ Hatschek. Kết quả nghiên cứu trong phòng thí nghiệm đã lựa chọn được cấp phối chế tạo tấm xi măng-sợi có cường độ chịu uốn là cao nhất đạt đến 12 MPa. Bằng phương pháp thử cường độ chịu uốn và phân tích cấu trúc hình thái học bề mặt đã chỉ ra sự khác biệt về biến dạng khi uốn và vùng chuyển tiếp giữa sợi và nền của composite xi măng-sợi PVA và composite xi măng-sợi bazan., Tóm tắt tiếng anh, Fiber-cement sheets are made from the main materials of blend portland cement, pulp-craft, highly activity puzzolanic additivemetakaolin, PVA fibers or basalt fibers on a laboratory equipment system for making the specimens. The equipment is modeled the Hatschek technology. The results of research in the laboratory have selected the ratio of PVA fibers, basalt fibers, metakaolin mineral additives, pulp-craft to receive the maximum bending strengths of the cement-fiber sheets at 12 MPa. The flexural strength and analyzing the surface morphology showed differences in flexural deformation, as well as the transition zone between the fibers and the matrix of cement-PVA fiber and cement-basalt fiber composites.

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