Method and reactor for separating and removing heavy metals from wastewater using sulfhydryl-modified nano-magnetized activated carbon

A method for separating and removing heavy metals from wastewater using a sulfhydryl-modified nano-magnetized activated carbon, comprising

• step 1, preparing a sulfhydryl-modified nano-magnetized activated carbon:
• adding an activated carbon into a mixed solution of FeCl2 and FeCl3 for a reduction reaction at a pH value of 10-11, and a temperature of 70-80° C. for 60 min, and then aging at ambient temperature for 24 h, to form Fe3O4 on the activated carbon, obtaining a nano-magnetized activated carbon, wherein a mass ratio of the activated carbon to Fe3O4 formed is 1:1, 1:2 or 1:3;
• subjecting the nano-magnetized activated carbon to a sulfhydryl modification, to obtain a sulfhydryl-modified nano-magnetized activated carbon;
• step 2, introducing wastewater:
• introducing heavy-metal-containing wastewater into a batch reactor via a water inlet pipe;
• step 3, stirring:
• turning a stirring device inside the batch reactor on for stirring;
• step 4, adding the sulfhydryl-modified nano-magnetized activated carbon obtained in step 1 into the batch reactor;
• step 5, performing an adsorption reaction while stirring in the batch reactor, to adsorb heavy metals in the wastewater by the sulfhydryl-modified nano-magnetized activated carbon;
• step 6, separating:
• after the adsorption reaction, precipitating the sulfhydryl-modified nano-magnetized activated carbon under a magnetic field generated by a magnetic separator, obtaining a precipitated sulfhydryl-modified nano-magnetized activated carbon and a supernate;
• step 7, opening a water outlet pipe after the separating, to discharge the supernate;
• and
• step 8, opening a sludge outlet at the bottom of the batch reactor, to discharge the precipitated sulfhydryl-modified nano-magnetized activated carbon, thereby completing a treatment cycle.