Cyclopentanethiol CAS 1679-07-8

CN202110291866.2 reports a preparation method of silver telluride quantum dots with high brightness and narrow half-maximum width. By regulating the activity of the silver precursor generated by the reaction of silver thiol and phosphine, and using the tellurium precursor synthesized in the air, silver telluride quantum dots with excellent performance were prepared. The technical solutions adopted by the present invention include:

1) Under an inert atmosphere, add the silver source and thiol to the solvent, raise the temperature to the first temperature, add the organic phosphine, and obtain solution A;

2) Preparation of tellurium precursor: Mix tellurium powder and organic phosphine and heat in air to obtain solution B;

3) Under an inert atmosphere, heat solution A to the second temperature, hot-inject freshly prepared solution B into solution A, rapidly cool to the third temperature, react for 1 to 40 minutes, cool to room temperature, and obtain telluride after purification. Silver quantum dots.

The activity of the silver precursor can be controlled by adjusting the type and amount of thiol and organic phosphine in step 1). The preferred molar feed ratio of thiol, organic phosphine and silver source is 7:1:1.

The size of the quantum dots during nucleation is adjusted by adjusting the molar ratio of the silver source in step 1) to the tellurium precursor in step 3), thereby controlling the emission wavelength.

The mercaptan in step 1) can be selected from at least but not limited to alkyl mercaptan having 8 to 18 carbon atoms, cyclohexane mercaptan and cyclopentyl mercaptan.

CN201811352989.7 provides a method for preparing modified activated carbon for recovering Au(S2O3)23- in solution, that is, using a cyclic thiol solution as an activated carbon modifier, and preparing a cyclic thiol modified activated carbon by an impregnation method. ; Specifically includes the following steps:

(1) Wash with deionized water to remove the ash from the activated carbon, filter and dry;

(2) Place the activated carbon in a ring thiol solution with a concentration of 0.1g/L ~ 20g/L, soak it at room temperature for 0.5 h ~ 48 h, filter and dry to prepare modified activated carbon.

Preferably, the ring-containing thiol of the present invention is a thiol containing at least one thiol group in the molecular structure and a ring structure.

Further, the ring-containing thiols of the present invention are 2-mercaptobenzoxazole and its derivatives, 2-mercaptobenzimidazole and its derivatives, 2-mercaptothiazoline and its derivatives, dimercaptothiadiazole One or a mixture of one or more of its derivatives, thiocyanate, and cyclopentanethiol.

The beneficial effects of the present invention are:

(1) The present invention improves the adsorption capacity of activated carbon for Au(S2O3)23- by loading cyclic thiol on the surface of activated carbon, and can effectively adsorb gold in the thiosulfate gold leaching solution. No use is required during the entire modification process. Any toxic substances containing cyanide (CN-) or heavy metals; it overcomes the cyanide contamination of the current activated carbon-loaded copper cyanide ion (Cu(CN)42-) adsorption and recovery of Au(S2O3)23- and the presence of Prussian blue. The modification process is complex and it is difficult to continuously adsorb and other shortcomings.

(2) The preparation process of the modified activated carbon of the present invention is simple, the modification cost is low, and the recovery rate of gold is high; the prepared activated carbon has multiple adsorption capabilities; and the solvent and ring thiol can be fully recovered, multiple times Recycling, no toxic waste emissions, environmentally friendly.

(3) The modified activated carbon can adapt to a wide pH range of the adsorption solution, and the activated carbon has good adsorption effect in the range of pH ≥ 6; the prepared activated carbon can be continuously adsorbed to meet the requirements of industrial production.