Abstract
More and more chromium (Cr) is being discharged into the environment, which is posing ecological risks to animals, plants and microorganisms, and endangering human health. Hexavalent Cr (VI) was more toxic than trivalent Cr (III), and the mobility of Cr (VI) in the water environment was higher than that of Cr (III). Therefore, various effective methods of reducing Cr (VI) were developed. In this research, the “biochar”, “chromium remediation”, were taken as keywords for patent retrieval. The retrieval time is from 1986 to 2019. A great number of patents about Cr (VI) remediation and biochar are collected and analysed applying big data. Based on the number and the legal status of patent applications, and the trend of patent applications, the research situation of biochar for Cr (VI) remediation in China is studied by S-curve law which is used to describe the technology life cycle theory in TRIZ theory. The results show that the technology of biochar for Cr remediation is still in its initial stage and full of potential.
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