ANION ABSORBENT CARRYING RARE EARTH-CONTAINING HYDROXIDE AND MANUFACTURING METHOD THEREFOR

• Main Authors: SAITO KYOICHI, HAYAKAWA RINA, SUGO TAKANOBU, SUZUKI KOICHI, FUJIWARA KUNIO
• Format: Patent
• Language: English; Japanese
• Published: 11.10.2018
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; DECONTAMINATION ARRANGEMENTS THEREFOR; METALLURGY; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PHYSICS; PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULARRADIATION OR PARTICLE BOMBARDMENT; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To overcome a fact that an application method is limited to a packed column method because a shape is granular even though one manufactured by solidifying rare earth-containing hydroxide or one carrying an active charcoal are known as anions such as antimony or iodine in a liquid, and there is no anion absorbent having sufficient absorption volume and large absorption rate even though milling included cerium oxide into a polymer fiber is proposed.SOLUTION: By carrying rare earth-containing hydroxide onto a fiber by introducing a cation exchange group to a graft side chain of an organic polymer fiber substrate, absorbing a rare earth ion and then making in contact with an alkali solution, a large amount of rare earth-containing hydroxide can be carried on a fiber peripheral part and an anion absorbent having large absorption volume and absorption rate can be manufactured. By using advantage of molding processability of the fiber, application methods in a circulation method or an impregnation method can be used.SELECTED DRAWING: Figure 1 【課題】 液体中のアンチモンやヨウ素などの陰イオンは希土類元素の含水酸化物を固形化したものや活性炭等に担持したものが知られていたが、形状が粒状であるため、使用方法が充填塔方式に限られていた。また、含水酸化セリウムを高分子繊維に練りこむことも提案されているが、十分な吸着容量及び吸着速度が大きい陰イオン吸着材がなかった。【解決手段】 有機高分子繊維基材のグラフト側鎖にカチオン交換基を導入し、希土類元素イオンを吸着させた後、アルカリ水溶液に接触させ、希土類元素の含水酸化物を繊維上に担持することによって、多量の希土類含水酸化物を繊維周縁部に担持でき、大きな吸着容量と吸着速度を兼ね備えた陰イオン吸着材を製造することが可能となった。また、繊維の成型加工性の良さを生かし、流通方式や浸漬方式での使用方法が可能となった。【選択図】図１