Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266200, China.
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266200, China.
J Environ Sci (China). 2020 May;91:189-198. doi: 10.1016/j.jes.2020.02.005. Epub 2020 Feb 14.
This study aimed to fabricate new and effective material for the efficiency of phosphate adsorption. Two types of adsorbent materials, the zirconium hydroxides embedded in pomegranate peel (Zr/Peel) and zirconium-lanthanum hydroxides embedded in pomegranate peel (Zr-La/Peel) were developed. Scanning electronic microscopy (SEM), x-ray photoelectron spectroscopy (XPS) and x-ray diffraction (XRD) were evaluated to give insight into the physicochemical properties of these adsorbents. Zr-La/Peel exceeded the adsorption efficiency of Zr/Peel adsorbents in batch adsorption experiments at the same pH level. The peel as a host can strive to have a strong "shielding effect" to increase the steadiness of the entrenched Zr and La elements. La and Zr are hydroxide metals that emit many hydrogen ions during the hydrolysis reaction, which contribute to protonation and electrostatic attraction. The highest adsorption capacity of La-Zr/Peel for phosphate was calculated to be 40.21 mg/g, and pseudo second-order equation is very well fitted for kinetic adsorption. Phosphate adsorption efficiency was reduced by an increase of pH. With the background of coexisting Cl, little effect on adsorption efficiency was observed, while adsorption capacities were reduced by almost 20-30% with the coexistence of [Formula: see text] , [Formula: see text] and humic acid (HA).
本研究旨在制备新型高效的磷酸盐吸附材料。开发了两种吸附剂材料：石榴皮负载的氧化锆（Zr/Peel）和石榴皮负载的锆镧氧化物（Zr-La/Peel）。通过扫描电子显微镜（SEM）、X 射线光电子能谱（XPS）和 X 射线衍射（XRD）对这些吸附剂的物理化学性质进行了评估。在相同 pH 值的批式吸附实验中，Zr-La/Peel 的吸附效率超过了 Zr/Peel 吸附剂。果皮作为主体可以努力具有强的“屏蔽效应”，以增加固着的 Zr 和 La 元素的稳定性。La 和 Zr 是在水解反应过程中释放出许多氢离子的氢氧化物金属，这有助于质子化和静电吸引。La-Zr/Peel 对磷酸盐的最大吸附容量计算为 40.21mg/g，准二级方程非常适合动力学吸附。吸附效率随 pH 值的升高而降低。在共存 Cl 的背景下，对吸附效率的影响很小，而共存[Formula: see text]、[Formula: see text]和腐殖酸（HA）时，吸附容量降低了近 20-30%。
