Kim Sok, Park Yun Hwan, Choi Yoon-E
Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Korea.
OJeong Resilience Institute, Korea University, Seoul 02841, Korea.
Polymers (Basel). 2022 Apr 19;14(9):1645. doi: 10.3390/polym14091645.
The eutrophication of freshwater environments caused by an excess inflow of phosphorus has become a serious environmental issue because it is a crucial factor for the occurrence of harmful algal blooms (HABs) in essential water resources. The adsorptive removal of phosphorus from discharged phosphorus containing effluents has been recognized as one of the most promising solutions in the prevention of eutrophication. In the present study, a polyvinyl chloride (PVC)-polyethyleneimine (PEI) composite fiber (PEI-PVC) was suggested as a stable and recoverable adsorbent for the removal of phosphorus from aqueous phases. The newly introduced amine groups of the PEI-PVC were confirmed by a comparison between the FT-IR and XPS results of the PVC and PEI-PVC. The phosphorus sorption on the PEI-PVC was pH dependent. At the optimum pH for phosphorus adsorption (pH 5), the maximum adsorption capacity of the PEI-PVC fiber was estimated to be 11.2 times higher (19.66 ± 0.82 mg/g) than that of conventional activated carbon (1.75 ± 0.4 mg/g) using the Langmuir isotherm model. The phosphorus adsorption equilibrium of the PEI-PVC was reached within 30 min at pH 5. From the phosphorus-loaded PEI-PVC, 97.4% of the adsorbed amount of phosphorus on the PEI-PVC could be recovered by employing a desorption process using 1M HCl solution without sorbent destruction. The regenerated PEI-PVC through the desorption process maintained a phosphorus sorption capacity almost equal to that of the first use. In addition, consistently with the PVC fiber, the PEI-PVC fiber did not elute any toxic chlorines into the solution during light irradiation. Based on these results, the PEI-PVC fiber can be suggested as a feasible and stable adsorbent for phosphorus removal.
磷的过量流入导致淡水环境富营养化，这已成为一个严重的环境问题，因为它是重要水资源中有害藻华（HABs）发生的关键因素。从含磷废水中吸附去除磷已被认为是预防富营养化最有前景的解决方案之一。在本研究中，提出了一种聚氯乙烯（PVC）-聚乙烯亚胺（PEI）复合纤维（PEI-PVC）作为从水相中去除磷的稳定且可回收的吸附剂。通过比较PVC和PEI-PVC的傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）结果，证实了PEI-PVC中新引入的胺基。PEI-PVC对磷的吸附取决于pH值。在磷吸附的最佳pH值（pH 5）下，使用朗缪尔等温线模型估计，PEI-PVC纤维的最大吸附容量（19.66±0.82 mg/g）比传统活性炭（1.75±0.4 mg/g）高11.2倍。在pH 5时，PEI-PVC的磷吸附平衡在30分钟内达到。从负载磷的PEI-PVC中，通过使用1M HCl溶液进行解吸过程，可回收PEI-PVC上吸附的磷量的97.4%，且不会破坏吸附剂。通过解吸过程再生的PEI-PVC保持的磷吸附容量几乎与首次使用时相同。此外，与PVC纤维一致，PEI-PVC纤维在光照期间不会向溶液中洗脱任何有毒氯。基于这些结果，PEI-PVC纤维可被认为是一种可行且稳定的除磷吸附剂。
