Hiroyuki Hoshina

Removal of boron by boron-selective adsorbent prepared using radiation induced grafting technique

Abstract Boron-selective adsorbent was synthesized by grafting the glycidyl methacrylate onto polyethylene (PE) non-woven fiber using electron beam ionizing radiation. Subsequently, the grafted PE with 180% degree of grafting was chemically modified using n-methyl-d-glucamine (NMDG). The density of NMDG of the synthesized adsorbent was 2.2 mmol/g. Batch mode adsorption’s test showed that pH ranging from 4 to 8 had highest adsorption capacity and the adsorption capacity of the grafted adsorbent was 14.5 mg-B/g-adsorbent. Column mode adsorption test showed a marginal reduction of total breakthrough capacity from 13.8 to 12.7 mg-B/g-adsorbent, for feeding speed of space velocity (SV) 15 and SV 400, respectively. This indicated that the synthesized adsorbent had exhibited high performances of boron adsorption and desorption process. High performances of the prepared adsorbent could contribute from few factors such as fine size of the adsorbent, large surface area, and homogeneous pore size. Desorption of boro...

A Novel Avenue to Gold Nanostructured Microtubes Using Functionalized Fiber as the Ligand, the Reductant, and the Template

Gold nanostructured microtubes (AuNMTs) are prepared using a tertiary amine group-functionalized polyethylene (PE)-coated polypropylene (PP) nonwoven fabric as a ligand, a reductant, and a template, which takes advantage of the different radiation effects of PE and PP. The Au(III) ions are absorbed and reduced only in the PE layer to form the aggregation of gold nanoparticles; thus, AuNMTs are obtained after the calcination.

Removal of Fluorine and Boron From Groundwater Using Radiation-Induced Graft Polymerization Adsorbent at Mizunami Underground Research Laboratory

High fluorine and boron contents in groundwater are commonly reduced using coagulation and ion-exchange treatments. As an alternative, we tested the efficiency of fluorine and boron removal from groundwater using radiation-induced graft polymerization adsorbent. The durability of the adsorbent was also determined by varying groundwater flow-through rates and repetitive use of the adsorbent. The results indicated that it was possible for the adsorbent to remove more than 95% of boron and fluorine from the groundwater, and that the performance of the adsorbent for boron removal was better than commonly used ion-exchange resin. The adsorbent used several times was able to remove boron, indicating that the adsorbent can be used for efficient boron removal.Copyright