Provided is an arm-wheel type vehicle including: a main body; an arm that is rotatably installed to the main body; a wheel connected to the arm; a first buffer device that is installed on the main body; and a second buffer device that is installed on the arm. The stopping member is preferably adjustable, allowing the positive clearance to be adjusted. Various embodiments of the present invention comprise sorbent fiber compositions, apparatus comprising a plurality of sorbent fibers, and methods of using the same for the capture of at least one component from a medium, for example CO2 from flue gas.