6 results about "Chemical methodology" patented technology

The invention relates to the technical field of moss cleaning in sewage treatment, and discloses a method for cleaning moss in a sedimentation tank, which comprises the following steps: S1, pretreating moss, and converting the moss into a state convenient to remove by physical and chemical methods; s2, spraying treatment: spraying the moss with reclaimed water containing sodium hypochloride in a temperature range of 20-30 DEG C; s3, performing ultraviolet irradiation, namely performing ultraviolet irradiation on the obtained first moss; s4, inhibiting the growth of moss, namely performing post-treatment on the second moss to inhibit the growth of the second moss; s5, waste is cleaned, moss residues, cleaning agents and other waste generated in the cleaning process are cleaned in time, influences of the residues on water quality are avoided, and moss is prevented from growing again. Through a physical and chemical combined mode, loose moss in the sedimentation tank is effectively removed firstly, then a solution containing sodium hypochloride is used for spraying the moss, it is ensured that all moss patches are in uniform contact, and the ideal chemical cleaning effect is achieved.

The invention relates to the technical field of chemical methods, in particular to preparation of a Cu and Ni doped modified MIL-88A material and application of the Cu and Ni doped modified MIL-88A material in activating potassium hydrogen persulfate to degrade PFBS. The preparation method comprises the following steps: performing ultrasonic dispersion and dissolution on fumaric acid, CuCl2. 2H2O, FeCl3. 6H2O and Ni (NO3.) 2.6 H2O, mixing, reacting at specific temperature and rotating speed, and washing and drying to obtain a product; the application comprises the following steps: preparing PMS and PFBS solutions, adding the modified material, and reacting under specific conditions. The problems that existing MIL-88A catalytic active sites are limited, and Fe < 3 + > / Fe < 2 + > valence state circulation conversion is slow are solved.

The invention provides a preparation method of a pressure self-adaptive non-linear deformation rubber sealing element, and belongs to the technical field of physical and chemical methods.According to the method, nitrile rubber and EPDM are mixed according to a certain proportion, nano-silica filler and a pressure-sensitive deformation triggering agent are added, and a multi-stage mixing and vulcanization technology is adopted to construct a differentiated cross-linked network. By adopting the technologies of reducing treatment, circumferential prestress application, nonlinear deformation area distribution treatment and the like and combining double-layer mold compression molding and nitrogen protection vulcanization, the sealing element forms the gradient strain response characteristic. An elastic modulus distribution optimization function, a Pareto optimization method and a pre-trained sealing strain response prediction network model are innovatively introduced, calculation-driven sealing element design and preparation are achieved, and the problems that in the prior art, a rubber sealing element cannot achieve self-adaptive deformation under the variable pressure working condition, and the sealing performance is poor are solved. And the sealing performance is not stable.