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The Best Robot Vacuum Cleaner For Sale Many robot vacuums come with clever features like self-emptying, cliff sensor (to prevent getting stuck on the stairs), virtual barriers, timer delays and cliff sensors. They can be made smaller to fit under furniture, or fit into small spaces like studios or home offices. Advanced models can map out your home and design cleaning schedules. Some models have digital zones that prevent the ru

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Cd and Zn contamination in water occurs frequently that threatens water supply, human health, and food production. MnFeB, a novel absorbent biochar modified using KMnO4 and hematite, was prepared and used for the treatment of Cd2+ and Zn2+solutions. MnFeB exhibits a rough surface structure, large specific surface area, higher total pore volume, massive functional groups, and abundant iron oxide, all of which contribute to higher Cd2+ and Zn2+ adsorption capacity. In single metal systems, maximum Cd2+ and Zn2+ adsorption capacities of M