Methods for preparing fly ash-based layered double hydroxides modified by molybdenum sulfide intercalation

A method for preparing fly ash-based layered double hydroxides modified by molybdenum sulfide intercalation, comprising:

• S1, washing fly ash from municipal solid waste incineration 1 to 2 times by adding the fly ash into a sodium hydroxide solution, wherein a liquid-to-solid ratio of the sodium hydroxide solution to the fly ash is (10-12) mL:1 g;
• and taking solids after filtration to obtain washed fly ash solids;
• S2, mixing the washed fly ash solids, deionized water, a hydrochloric acid solution, and aluminum chloride, wherein a mass ratio of the washed fly ash solids to the aluminum chloride is (5-20):1, and the deionized water is added according to a liquid-to-solid ratio of (10-14) mL:1 g;
• adjusting a pH to 11-13 by using sodium hydroxide, fully stirring to obtain a mixture, transferring the mixture into a ball mill jar for temperature-controlled ball milling, and performing centrifugation, water washing, and drying on a solid-liquid mixture obtained after the ball milling to obtain the fly ash-based layered double hydroxide;
• S3, adding ammonium tetrathiomolybdate into the fly ash-based layered double hydroxide obtained in S2, wherein a mass ratio of the fly ash-based layered double hydroxide to the ammonium tetrathiomolybdate is (1.1-1.5):1, adding the deionized water, and performing the temperature-controlled ball milling to obtain a mixed solution;
• and
• S4, performing centrifugation, filtration, washing, and drying on the mixed solution obtained in S3 to obtain a molybdenum sulfide intercalation-modified fly ash-based layered double hydroxide;
• wherein
• in S2, a rotational speed of the ball mill jar is 700-900 rpm, a ball-to-material ratio is (4-7):1, a ball-milling time is 4-6 h, and a ball-milling temperature is controlled at 100-120° C.;
• and
• in S3, conditions for the temperature-controlled ball milling include a ball-to-material ratio of (8-10):1, a ball-milling time of 6-8 h, a rotation speed of 400-500 rpm, and a ball-milling temperature controlled at 80-100° C.