Rimsha Khalid, Isham Areej, Faiza Ashraf, Saqlain Raza, Isham Areej Abid, Tayyab Ahsan, Tan Bien
{"title":"用于从核废水中高效去除铀离子的聚磷苯基超交联聚合物","authors":"Rimsha Khalid, Isham Areej, Faiza Ashraf, Saqlain Raza, Isham Areej Abid, Tayyab Ahsan, Tan Bien","doi":"10.1039/d4ew00614c","DOIUrl":null,"url":null,"abstract":"This study focuses on the removal of uranium ions from nuclear wastewater by fabricating an inorganic-organic hybrid cyclic and linear polyphosphazenes based polymer. Synthesized HCP-A and HCP-B had BET surface areas of 497.06 m2/g and 410.75 m2/g, respectively, while pore size distribution (PSD) was under 1 to 20 nm. Maximum removal efficiency of uranium by HCP-A and HCP-B for lab prepared sample was found 97.6 % and 95.2 % respectively at pH 6, contact period of 80 minutes, an adsorbent weight of 0.6 g, and temperature of 25 °C, while for lab prepared nuclear wastewater sample it was 83.9 % and 79.8 %, respectively. Lone pair-cation interactions, metal ligand complexation, hydrogen bonding, cation-pi interactions and electrostatic interactions are responsible for adsorption. The point of zero charge (PZC) of both HCPs is at pH 4.6. The optimal uranium uptake capacities of HCP-A and HCP-B were found to be 714.28 mg/g and 555.56 mg/g, respectively. Freundlich model is the best match for uranium adsorption by both HCPs, with R2 values of 0.9775 and 0.9931, respectively. The adsorption kinetics study exhibits that it fits a pseudo 2nd order kinetic model with R2 values of 0.9446 for HCP-A and 0.9882 for HCP-B. The uranium uptake process was found to be spontaneous and exothermic in nature. For HCP-A and HCP-B, Gibbs free energy (ΔG) was found -1.516 kJ ¬mol−1 and -0.27 kJ -mol−1, enthalpy change (ΔH) −41.59 kJ ¬mol−1 and −40.65 kJ ¬mol−1, and entropy change (ΔS) –0.134 kJ ¬mol−1 ¬K−1 and −0.136 kJ ¬mol−1 ¬K−1, respectively. The reusability of HCPs with minor decrease (2 % and 1 %) in their adsorption capability suggests that they can be used in industrial level applications.","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":null,"pages":null},"PeriodicalIF":3.5000,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Polyphosphazene-based hyper crosslinked polymer for efficient uranium ion removal from nuclear wastewater\",\"authors\":\"Rimsha Khalid, Isham Areej, Faiza Ashraf, Saqlain Raza, Isham Areej Abid, Tayyab Ahsan, Tan Bien\",\"doi\":\"10.1039/d4ew00614c\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This study focuses on the removal of uranium ions from nuclear wastewater by fabricating an inorganic-organic hybrid cyclic and linear polyphosphazenes based polymer. Synthesized HCP-A and HCP-B had BET surface areas of 497.06 m2/g and 410.75 m2/g, respectively, while pore size distribution (PSD) was under 1 to 20 nm. Maximum removal efficiency of uranium by HCP-A and HCP-B for lab prepared sample was found 97.6 % and 95.2 % respectively at pH 6, contact period of 80 minutes, an adsorbent weight of 0.6 g, and temperature of 25 °C, while for lab prepared nuclear wastewater sample it was 83.9 % and 79.8 %, respectively. Lone pair-cation interactions, metal ligand complexation, hydrogen bonding, cation-pi interactions and electrostatic interactions are responsible for adsorption. The point of zero charge (PZC) of both HCPs is at pH 4.6. The optimal uranium uptake capacities of HCP-A and HCP-B were found to be 714.28 mg/g and 555.56 mg/g, respectively. Freundlich model is the best match for uranium adsorption by both HCPs, with R2 values of 0.9775 and 0.9931, respectively. The adsorption kinetics study exhibits that it fits a pseudo 2nd order kinetic model with R2 values of 0.9446 for HCP-A and 0.9882 for HCP-B. The uranium uptake process was found to be spontaneous and exothermic in nature. For HCP-A and HCP-B, Gibbs free energy (ΔG) was found -1.516 kJ ¬mol−1 and -0.27 kJ -mol−1, enthalpy change (ΔH) −41.59 kJ ¬mol−1 and −40.65 kJ ¬mol−1, and entropy change (ΔS) –0.134 kJ ¬mol−1 ¬K−1 and −0.136 kJ ¬mol−1 ¬K−1, respectively. The reusability of HCPs with minor decrease (2 % and 1 %) in their adsorption capability suggests that they can be used in industrial level applications.\",\"PeriodicalId\":75,\"journal\":{\"name\":\"Environmental Science: Water Research & Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.5000,\"publicationDate\":\"2024-09-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Environmental Science: Water Research & Technology\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://doi.org/10.1039/d4ew00614c\",\"RegionNum\":4,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, ENVIRONMENTAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Science: Water Research & Technology","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1039/d4ew00614c","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
Polyphosphazene-based hyper crosslinked polymer for efficient uranium ion removal from nuclear wastewater
This study focuses on the removal of uranium ions from nuclear wastewater by fabricating an inorganic-organic hybrid cyclic and linear polyphosphazenes based polymer. Synthesized HCP-A and HCP-B had BET surface areas of 497.06 m2/g and 410.75 m2/g, respectively, while pore size distribution (PSD) was under 1 to 20 nm. Maximum removal efficiency of uranium by HCP-A and HCP-B for lab prepared sample was found 97.6 % and 95.2 % respectively at pH 6, contact period of 80 minutes, an adsorbent weight of 0.6 g, and temperature of 25 °C, while for lab prepared nuclear wastewater sample it was 83.9 % and 79.8 %, respectively. Lone pair-cation interactions, metal ligand complexation, hydrogen bonding, cation-pi interactions and electrostatic interactions are responsible for adsorption. The point of zero charge (PZC) of both HCPs is at pH 4.6. The optimal uranium uptake capacities of HCP-A and HCP-B were found to be 714.28 mg/g and 555.56 mg/g, respectively. Freundlich model is the best match for uranium adsorption by both HCPs, with R2 values of 0.9775 and 0.9931, respectively. The adsorption kinetics study exhibits that it fits a pseudo 2nd order kinetic model with R2 values of 0.9446 for HCP-A and 0.9882 for HCP-B. The uranium uptake process was found to be spontaneous and exothermic in nature. For HCP-A and HCP-B, Gibbs free energy (ΔG) was found -1.516 kJ ¬mol−1 and -0.27 kJ -mol−1, enthalpy change (ΔH) −41.59 kJ ¬mol−1 and −40.65 kJ ¬mol−1, and entropy change (ΔS) –0.134 kJ ¬mol−1 ¬K−1 and −0.136 kJ ¬mol−1 ¬K−1, respectively. The reusability of HCPs with minor decrease (2 % and 1 %) in their adsorption capability suggests that they can be used in industrial level applications.
期刊介绍:
Environmental Science: Water Research & Technology seeks to showcase high quality research about fundamental science, innovative technologies, and management practices that promote sustainable water.