Corrigendum to “Effect of light irradiation on heavy metal adsorption onto microplastics” [Chemosphere 285(2021)/131457] (Chemosphere (2021) 285, (S0045653521019299), (10.1016/j.chemosphere.2021.131457))

The authors regret the errors, which are in Fig. 8 and 9, and table 1. The typographical error in Fig. 8 is rectified. The errors in Fig. 9 and table 1 are associated with the incorrect estimation of the adoption capacities of Pb on PP pellets. Based on the error, the evaluation of rate constants in adsorption is misled. The misled paragraphs by the calculating error are in the sections of the abstract, 3.5 (the Adsorption experiments), and the conclusion. To stop misleading by these errors, the relative sections are replaced by the following information: 1. In the abstract: “Due to the changes of functional groups after the exposure to the Xenon lamp for 28 days, the adsorption capacities of the PP pellets were up to 274.4 mg⋅kg−1, 1.7 to 2.5 times higher than that of the raw PP pellets depending on the solution pHs. The adsorption behavior can be described by a pseudo-second-order model with rate constants of adsorption of 0.00212–0.01404 kg⋅mg−1⋅h−1.” This statement should be to be revised by the following sentence: Due to the changes of functional groups after the exposure to the Xenon lamp for 28 days, the adsorption capacities of the PP pellets were up to 26.47 mg⋅kg−1, 1.4 to 2.3 times higher than that of the raw PP pellets depending on the solution pHs. The adsorption behavior can be described by a pseudo-second-order model with rate constants of adsorption of 0.0216–0.0465 kg⋅mg−1⋅h−1. 2. In the section 3.5.1: “The highest adsorption capacities occurred at pH = 8, and those of the virgin PP pellets and the aged PP pellets were 160.1 and 274.4 mg⋅kg−1, respectively. The lowest adsorption capacities occurred at pH = 6 and they were approximately 75.50 (the virgin pellets) and 174.1 mg⋅kg−1 (the aged pellets).” This statement should be to be revised by the following sentence: The highest adsorption capacities occurred at pH = 8, and those of the virgin PP pellets and the aged PP pellets were 20.67 and 33.52 mg⋅kg–1, respectively. The lowest adsorption capacities occurred at pH = 6 and they were approximately 9.698 (the virgin pellets) and 20.78 mg⋅kg−1 (the aged pellets). 3. In the section 3.5.1: “The lowest adsorption capacities of Pb on the PP pellets are still larger than the guideline values of FAO/WHO for Pb in fish and the ERL of NOAA in sediment, which imply an increased human health risk of ingesting fish contaminated with PP pellets (NOAA, 1999; FAO/WHO, 1995). The lowest adysorption capacities of Pb on the PP pellets are still larger than the guideline values of FAO/WHO for Pb in fish and the ERL of NOAA in sediment, which imply an increased human health risk of ingesting fish contaminated with PP pellets (NOAA, 1999; FAO/WHO, 1995). For a solution pH of 8, the adsorbed Pb concentration onto the aged pellets is higher than the ERM of NOAA in the sediment, implying that more than 50% of creatures may suffer from the Pb on aged PP pellets (NOAA, 1999).” This statement should be to be revised by the following sentence: The lowest adsorption capacity of Pb on the PP pellets is larger than the guideline values of FAO/WHO for Pb in fish (0.3 mg/kg) but smaller than the ERL of NOAA (46.7 mg/kg) in sediment, which implies an increased human health risk of ingesting fish contaminated with PP pellets (NOAA, 1999; FAO/WHO, 1995). 4. In the section 3.5.2: “Due to the change of surface characteristics of the PP pellets with the UV exposure, the adsorption capacities of the aged pellets were 2.3, 2.5, and 1.7 times higher, when compared to those of the virgin pellets, at pH = 6, 7, and 8, respectively.” This statement should be to be revised by the following sentence: Due to the change of surface characteristics of the PP pellets with the UV exposure, the adsorption capacities of the aged pellets were 2.2, 2.3, and 1.4 times higher, when compared to those of the virgin pellets, at pH = 6, 7, and 8, respectively. 5. In the section 3.5.3: “The rate constant of the virgin PP pellets at pH = 6 (0.01404 kg⋅mg−1⋅h−1) is larger than that at pH = 8 (0.00212 kg⋅mg−1⋅h−1).” This statement should be to be revised by the following sentence: The rate constant of the virgin PP pellets at pH = 6 (0.1078 kg⋅mg−1⋅h−1) is larger than that at pH = 8 (0.01862 kg⋅mg−1⋅h−1). 6. In the conclusion: “(c) The highest Pb adsorption capacity onto the aged PP pellets increased with pH and reached 274.4 mg⋅kg−1 at pH = 8.” This statement should be to be revised by the following sentence: The highest Pb adsorption capacity onto the aged PP pellets increased with pH and reached 33.52 mg⋅kg−1 at pH = 8. The authors would like to apologise for any inconvenience caused. [Formula presented] Fig. 8. Effects of pH on distributions of different Pb species.[Formula presented] Fig. 9. Effects of contact time on the adsorption process and the qt value (a) pH = 6, (b) pH = 7, and (c) pH = 8. Solids and dashed lines represent the fits to the pseudo-first-order equation and the pseudo-second-order equation, respectively. The outlier was shown as hollow circles. Table 1. The fitting results of the first-order and the second-order kinetics models. [Table presented]