•Helianthus tuberosus L. leaf was used as a new source of chlorogenic acid (3-CQA).•Macroporous resins were used for enrichment and purification of 3-CQA.•Adsorption isotherms and kinetics were systematically investigated.•Efficient method for the separation of 3-CQA on ADS-21 resin was developed.•Good separation and high recovery was achieved after one run treatment with ADS-21.In the present study, a simple and efficient method for the preparative separation of 3-CQA from the extract of Helianthus tuberosus leaves with macroporous resins was studied. ADS-21 showed much higher adsorption capacity and better adsorption/desorption properties for 3-CQA among the tested resins. The adsorption of 3-CQA on ADS-21 resin at 25 °C was fitted best to the Langmuir isotherm model and pseudo-second-order kinetic model. Dynamic adsorption/desorption experiments were carried out in a glass column packed with ADS-21 to optimise the separation process of 3-CQA from H. tuberosus leaves extract. After one treatment with ADS-21, the content of 3-CQA in the product was increased 5.42-fold, from 12.0% to 65.2%, with a recovery yield of 89.4%. The results demonstrated that the method was suitable for large-scale separation and manufacture of 3-CQA from H. tuberosus leaves.

A combination technique for remediation of DDT and its metabolites (DDTr) contaminated soil based on successive steps of solvent extraction, followed by catalytic hydrodechlorination (HDC) was studied. Firstly, solvent extraction was applied to extract DDTr contaminated soil at ambient temperature and pressure. According to GC-MS analysis, the extracts from DDTr contaminated soil are mainly composed of p,p′-DDT, o,p′DDT, p,p′-DDE, o,p′-DDE, p,p′-DDD, and DCBP. Subsequently, catalytic HDH over a Pd/C catalyst was introduced to treat the extract from DDTr contaminated soil, and the HDC process of DDTr was surveyed by monitoring the GC-MS analysis. These results demonstrate that the combined technique of solvent extraction and catalytic HDC can effectively remediate DDTr contaminated soil and reduce its toxicity.

The catalytic hydrogenation reactivity of aromatic nitro compounds over RANEY® Ni was substantially improved when a moderate amount of metal fluoride (NaF, KF, MgF2, and CaF2) was added into the reaction system.