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The zero-valent iron (ZVI) immobilized in an alginate microsphere was prepared by using sodium alginate as a support material. The characteristics of the Fe 0 /alginate microsphere was characterized by FT-IR, SEM, BET, and XPS. The SEM and BET analyses showed that the Fe 0 /alginate microsphere had a multilevel porous structure and could adsorb ARB. Combined with Fe 0 reduction and Fe 3+ /Fe 2+ catalytic oxidation, the mineralization of ARB could be effectively realized. The ARB in the solution was discolored rapidly by the reduction of Fe 0 /alginate microsphere and then oxidized efficiently by the subsequent Fenton reaction. The discoloration rate of ARB in the reduction stage was 96.8%, with an Fe 0 /alginate microsphere dosage of 0.24g·L -1 and pH of 2.96 after reaction time of 180 min. ARB was reduced to organics of lower molecular weight due to the degradation of azo groups by Fe 0 . In the subsequent Fenton oxidation stage, the mineralization degree of ARB increased to 64.7% after the addition of 10.75 mmol·L -1 H 2 O 2 . The influence of the Fe 0 /alginate microsphere dosage, pH, reusability of the Fe 0 /alginate microsphere, and the stability of iron ions in the alginate microsphere were investigated. Due to the coordination of Fe 3+ /Fe 2+ ions with -COO - -in the alginate, the iron ion in the solution was 3.9% of the total iron content in the microsphere. Iron ions could be well immobilized in calcium alginate microspheres, so the iron hydroxides were generated in lower amounts. The Fenton reaction can be conducted in a wide range of pH. The Fe 2+ /Fe 3+ immobilized in the alginate microsphere demonstrated good catalytic performance after it was reused four times. Therefore, the synergy of reduction and Fenton oxidation by the Fe 0 /alginate microsphere was a better strategy for dye degradation.

Objective: To evaluate the therapeutic effect of amniotic membrane transplantation(AMT) for ocular burn., Methods: Twenty patients with ocular burn(28 eyes) were treated with amniotic membrane transplantation. Of them, there were 6 cases of severe alkali burn(10 eyes), 8 cases of severe acid burn(10 eyes), and 6 cases of thermal burn(8 eyes)., Results: In 28 eyes, ocular inflammation was controlled after 3-7 days of surgery; no continued dissolution, perforation and iris atrophy were found. There were corneal transparency in 16 eyes, keratoleukoma in 4 eyes, and total corneal opacity in 8 eyes. All eyeballs were saved and had stable ocular surface. There was no allograft immune rejection and secondary infection., Conclusion: Amnitic membrane transplantation can relieve the inflammatory reaction, reduce the growth of blood vessel and restrain the proliferation of fibrous tissue. It is an effect surgical method for ocular burn in reconstruction of ocular surface and salvage of eyeball.