Shang Yanan, Xu Xing, Qi Shuto, Zhao Yanxia, Ren Zhongfei, Gao Baoyu
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
J Colloid Interface Sci. 2017 Jun 15;496:118-129. doi: 10.1016/j.jcis.2017.02.019. Epub 2017 Feb 12.
Phosphate capture from aqueous was conducted using hydrous zirconium oxide (HZO) embedded in quaternary-ammonium Chinese reed (CR-N-HZO), and the characteristics of adsorbent was determined. HZO was dispersed as nanoparticles or nano-clusters on the external or inside the networking pores of CR-N-HZO. The surface of CR-N-HZO was heterogeneous with multiple adsorption sites, HZO nanocomposite and N(CHCH)Cl, which both contributed to the adsorption process. The phosphate uptake by CR-N-HZO was optimal at pH 3.0 and phosphate uptake by HZO nanocomposite was greatly inhibited at alkaline pH. Kinetics studies suggested that both the intra-particle mass-transfer and external resistances were likely to be the rate controlling steps. The Q (maximum adsorption capacity) of phosphate uptake by CR-N-HZO and CR-N (30°C) calculated based on Langmuir model was about 59.2mg(P)/g(CR-N-HZO) and 30.4mg(P)/g(CR-N). A high usage efficiency of Zr in CR-N-HZO was observed with calculated molar ratio of P/Zr to be 3.07.
采用嵌入季铵化芦苇（CR-N-HZO）中的水合氧化锆（HZO）从水溶液中捕获磷酸盐，并对吸附剂的特性进行了测定。HZO以纳米颗粒或纳米团簇的形式分散在CR-N-HZO网络孔的外部或内部。CR-N-HZO的表面具有多个吸附位点，呈非均相，HZO纳米复合材料和N(CHCH)Cl均对吸附过程有贡献。CR-N-HZO对磷酸盐的吸附在pH 3.0时最佳，而HZO纳米复合材料在碱性pH下对磷酸盐的吸附受到极大抑制。动力学研究表明，颗粒内传质和外部阻力都可能是速率控制步骤。根据朗缪尔模型计算，CR-N-HZO和CR-N（30°C）对磷酸盐的吸附Q（最大吸附容量）分别约为59.2mg(P)/g(CR-N-HZO)和30.4mg(P)/g(CR-N)。观察到CR-N-HZO中Zr的利用率较高，计算得到的P/Zr摩尔比为3.07。
