Nanomaterials refer to materials whose dimensions reach the nanometer scale in a certain dimension, two-dimensional or three-dimensional direction. It can be divided into zero-dimensional materials, one-dimensional materials, two-dimensional materials, three-dimensional materials. When a conventional material reaches the nanometer scale, its properties will be very different from usual. When the nanomaterial is a single atomic thickness, it is a two-dimensional material, representative of which is the first published graphene in 2004. In recent years, transition metal two-dimensional materials have also received great attention from scientists, such as tungsten disulfide, molybdenum disulfide or tungsten diselide, which have great potential for the next generation of electronic products.

To avoid resource wasting and environmental pollution, we need to emphasize the recovery of waste liquor from tungsten disulfide. It contains a certain amount of recyclable tungsten oxide and sodium sulfate.

Waste gases from tungsten disulfide are toxic hydrogen sulfide and some other gases. Among them, hydrogen sulfide poses a serious threat to the human health and environment. Therefore, we have to recycle the waste gases from tungsten disulfide.

The waste residue of tungsten disulfide usually contains a large amount of versatile tungsten oxide. So we must attach importance to the recovery of waste residue from tungsten disulfide to avoid resource wasting.