▎ 摘　　要

NOVELTY - Preparing adsorbent comprises (i) preparing graphene oxide by conventional modified Hummers method; (ii) dissolving N-isopropylacrylamide and methylene chloride(bis) in deionized water, adding 4-nitrophenol, dissolving by sonication, adding ammonium persulfate, stirring with graphene oxide under nitrogen and finally adding tetramethylethylenediamine and polymerizing at room temperature; (iii) washing the material with ammonia volume ratio of 1:1 until 4-nitrophenol is not detected in spectrophotometer; and (iv) washing material with deionized water until neutral, and drying at 30 degrees C. USE - The adsorbent is useful for recycling lead ions and 4-nitrophenol (claimed). ADVANTAGE - The method is simple, suitable for large-scale treatment of waste containing lead ions and 4-nitrophenol in water, and is economical.