Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan.
School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea.
Environ Geochem Health. 2018 Oct;40(5):2119-2129. doi: 10.1007/s10653-018-0087-y. Epub 2018 Mar 13.
To develop a novel granular adsorbent to remove arsenic and antimony from water, calcined Mg/Al-layered double-hydroxide (CLDH)-incorporated polyethersulfone (PES) granular adsorbents (PES-LDH) were prepared using a core-shell method having 25% PES in an N,N-dimethylformamide solution. The PES-LDH displayed a spherical hollow shape having a rough surface and the average particle size of 1-2 mm. On the PES-LDH surface, nanosized CLDH (100-150 nm) was successfully immobilized by consolidation between PES and CLDH. The adsorption of Sb(V) by PES-LDH was found to be more favorable than for As(V), with the maximum adsorption capacity of As(V) and Sb(V) being 7.44 and 22.8 mg/g, respectively. The regeneration results indicated that a 0.5 M NaOH and 5 M NaCl mixed solution achieved an 80% regeneration efficiency in As(V) adsorption and desorption. However, the regeneration efficiency of Sb(V) gradually decreased due to its strong binding affinity, even though the PES-LDH showed much higher Sb(V) adsorption efficiency than As(V). This study suggested that PES-LDH could be a promising granular adsorbent for the remediation of As(V) and Sb(V) contained in wastewater.
为了开发一种从水中去除砷和锑的新型颗粒状吸附剂，采用核壳法，在 N，N-二甲基甲酰胺溶液中加入 25%的聚醚砜（PES），制备了负载镁/铝层状双氢氧化物（CLDH）的聚醚砜（PES-LDH）颗粒状吸附剂。PES-LDH 呈球形空心状，表面粗糙，平均粒径为 1-2mm。在 PES-LDH 表面，纳米级 CLDH（100-150nm）通过 PES 和 CLDH 之间的固结成功固定在 PES-LDH 上。结果表明，PES-LDH 对 Sb(V)的吸附比 As(V)更有利，As(V)和 Sb(V)的最大吸附容量分别为 7.44 和 22.8mg/g。再生结果表明，0.5M NaOH 和 5M NaCl 混合溶液在 As(V)吸附和解吸中实现了 80%的再生效率。然而，由于 Sb(V)的强结合亲和力，其再生效率逐渐降低，尽管 PES-LDH 对 Sb(V)的吸附效率比 As(V)高得多。本研究表明，PES-LDH 可能是一种很有前途的用于处理废水中 As(V)和 Sb(V)的颗粒状吸附剂。
