Novel magnetic microcomposites consisting of graphene oxide and iron oxide was synthesized to immobilize metabolically versatile Paracoccus sp. MKU1 and Leucobacter sp. AA7 and tested for the simultaneous adsorption and enhanced biological detoxification of hexavalent chromium (Cr(VI)) from tannery wastewater. This study reports highest chromium adsorption of 272.6 mg/g and 179.3 mg/g with complete reduction of Cr(VI) to Cr(III) by the microcomposites of AA7 and MKU1 from wastewater in a bioreactor (10 L) at large-scale for first time in ex situ. Furthermore, both the microcomposites displayed an enhanced detoxification of tannery wastewater by reducing various physicochemical conditions such as ammonia, nitrate, TDS, fluoride, CaCO_3, Ca, Mg, NO₃ and SO₂ under the permissible limits. Use of electromagnetic device for magnetic microcomposites recovery from bioreactor yielded a maximum of 88% and 80.6% recovery for AA7 and MKU1, respectively. The rate of chromium recuperation achieved following desorption from the microcomposites of AA7 and MKU1 was 90.71% and 93.97%, respectively. Thus, the multifarious benefits including adsorption, metabolic detoxification, recovery, and recuperation by single functional microcomposites seems to be an intriguing and profitable approach for practicing in real-time operations to effectively remove heavy metals from the contaminated wastewater for environmental protection.

合成了由氧化石墨烯和氧化铁组成的新型磁性微复合材料，以固定代谢多功能副球菌。MKU1 和Leucobacter sp。AA7 并测试了制革废水中六价铬 (Cr(VI)) 的同时吸附和增强的生物解毒作用。这项研究报告了 272.6 mg/g 和 179.3 mg/g 的最高铬吸附量，其中 AA7 和 MKU1 的微复合材料在生物反应器 (10 L) 中的废水中完全还原为 Cr(III)第一次异地。此外，这两种微复合材料通过降低各种物理化学条件（如氨、硝酸盐、TDS、氟化物、CaCO _3、Ca、Mg、NO ₃和 SO ₂在允许范围内。使用电磁装置从生物反应器中回收磁性微复合材料，AA7 和 MKU1 的最高回收率分别为 88% 和 80.6%。从 AA7 和 MKU1 的微复合材料中解吸后，铬的回收率分别为 90.71% 和 93.97%。因此，单功能微复合材料的吸附、代谢解毒、回收和恢复等多种益处似乎是一种有趣且有利可图的方法，可用于实时操作以有效去除污染废水中的重金属以保护环境。