Water treatment technology for controlling bromate generation on basis of graphene-based material adsorption/catalytic oxidation cascade coupling

[0025] Specific embodiment one: the preparation method of graphene-based material in this embodiment (1) The preparation method of rGO is: (1) accurately weigh 0.1g graphite oxide, utilize agate mortar to grind for 20min; (2) place the above-mentioned powder Put it in a covered porcelain crucible, place it evenly, and place it in a muffle furnace under the half-covered state. Set the calcination temperature to 350°C, the calcination time to 60min, and the heating rate to 5°C / min. This gives black fluffy graphene oxide. (2) S-rGO can be prepared by the following process: (1) Ultrasonic dispersion of 0.1 g of graphite oxide into 70 mL of aqueous solution, ultrasonic dispersion for 30 min. (2) Add 0.22 g of mercaptoacetic acid into it and mix and stir for 30 min; (3) Transfer the obtained solution into a 100 mL reactor, the reaction temperature is 160° C., and the reaction time is 16 h.

[0026] When the concentration of bromide ions in the source water is lower than 21 μg / L,

[0028] Embodiment 2: For the specific preparation method of the graphene-based material in this embodiment, please refer to Embodiment 1.

[0029] When the concentration of bromide ions in the source water is between 21-61 μg / L, the feedwater treatment process that can efficiently reduce bromate generation is coagulation→sedimentation→filtration→rGO ozone catalytic oxidation→S-rGO adsorption of bromate → Chlorine disinfection → water out of the clear water pool. This process is realized through the following steps: (1) process required O 3 The concentration is 2.0mg / L; (2) the dosage of rGO catalyst required by the process is 0.25g / L; (3) the dosage of bromide ion adsorbent S-rGO required by the technology is 0.25g / L; (4) The dosage of bromate adsorbent S-rGO is 0.25g / L; (5) The contact time is 30min; (6) The pH of the reaction system is 6.01.

[0030] The rGO prepared in this process can reduce the amount of bromate by 26.5 μg / L while catalytically degrading organi

[0031] Embodiment 3: For the specific preparation method of the graphene-based material in this embodiment, please refer to Embodiment 1.

[0032] When the concentration of bromide ions in the source water is between 61-82 μg / L, the feedwater treatment process that can efficiently reduce bromate generation is coagulation→sedimentation→filtration→S-rGO adsorption of bromide ions in source water→rGO ozone catalysis Oxidation → S-rGO adsorption of bromate → chlorine disinfection → clear water pool effluent. This process is realized through the following steps: (1) process required O 3 The concentration is 2.0mg / L; (2) the dosage of rGO catalyst required by the process is 0.25g / L; (3) the dosage of bromide ion adsorbent S-rGO required by the technology is 0.25g / L; (4) The dosage of bromate adsorbent S-rGO is 0.25g / L; (5) The contact time is 30min; (6) The pH of the reaction system is 6.01.

[0033] The rGO prepared in this process can reduce the amount of bromate by 26.5