Abstract: A Phyllobacterium myrsinacearum strain N1N2-2 for efficient degradation of diphenylarsinic acid (DPAA) and use thereof are provided, relating to the technical field of microorganisms. The Phyllobacterium myrsinacearum strain N1N2-2 shows high tolerance and degradation efficiency to the DPAA, provides a microbial strain resource for the remediation and treatment of DPAA-contaminated soil and water environments, and has broad application prospects.

Abstract: A Phyllobacterium myrsinacearum strain N1N2-2 for efficient degradation of diphenylarsinic acid (DPAA) and use thereof are provided, relating to the technical field of microorganisms. The Phyllobacterium myrsinacearum strain N1N2-2 shows high tolerance and degradation efficiency to the DPAA, provides a microbial strain resource for the remediation and treatment of DPAA-contaminated soil and water environments, and has broad application prospects.

Abstract: Provided is a preparation system with rotary valves for magnetic particles for heavy metal contamination reduction and remediation of contaminated farmland soil. A raw material modifying tank and a mixed liquid pre-stirring tank are respectively in communication with a mixed liquid preparation tank. The mixed liquid preparation tank, a mixed liquid degassing tank and a dropping device are serially connected in sequence. A magnetic particle solidification device is arranged below the dropping device. Rotary valve cavities, and a piston mounting seat with piston cavities are arranged inside a dropping seat body of the dropping device. The rotary valves are rotatably arranged in the rotary valve cavities. Material sucking pipes and material passing pipes axially perpendicular to the material sucking pipes are arranged inside each of the rotary valves. A dropping plate with feeding pipes and dropping holes are arranged below the rotary valve cavities.

Abstract: Provided are a mercapto group-loaded layered double hydroxide (LDH)-based magnetic composite particle, and a preparation method and use thereof. The method includes: dissolving a water-soluble divalent magnesium salt and a water-soluble trivalent aluminum salt in water to obtain a mixed salt solution; pumping ammonia water into the mixed salt solution, and performing reaction I under stirring, subjecting an obtained product to centrifugation, and washing product obtained with deionized water; mixing the product with water, ethanol, and a coupling agent KH-580 to obtain a mixture, subjecting the mixture to reaction II while stirring to obtain mercapto group-loaded LDH; mixing the mercapto group-loaded LDH with ferroferric oxide and sodium alginate, adding deionized water thereto, and stirring to obtain a homogeneous mixed solution; adding the homogeneous mixed solution into a calcium chloride solution dropwise to form a magnetic bead; and leaving the magnetic bead to harden, and then washing and drying.