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Tausif Ahmad,Chandan Guria,Ajay Mandal 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
Pluronic F127 (PF127-) and PF127/bentonite-blended PVC ultrafiltration membranes are prepared in saltcoagulation baths involving NaCl, KCl, NH4Cl, MgCl2 and CaCl2. Saturated KCl-coagulation bath deliverssuper-hydrophilic membrane with improved surface-porosity (10.64 %), pore density (49.26 mm 2),roughness (51.12 nm) and hydrophilicity (contact angle <10 ), which endows remarkable enhancementof pure waterflux at 100 kPa (i.e., 1610.0 Lm 2 h-1) and antifouling performance (flux recovery ratio: 75.8%). Membrane performance is further improved by maximizing permeateflux and oil rejectionsimultaneously for actual oilfield produced water treatment using PVC-, PF127- and bentonite-loading,feed pH and feed temperature as decision variables and Pareto-optimal solution is obtained.
Rajak Dilip Kumar,Guria Chandan,Gope Laldeep,Jibran Jahir Ahamad 한국자원공학회 2023 Geosystem engineering Vol.26 No.5
The rising demands for critical metals and the environmental impact of solid waste disposal have increased interest in recycling of spent lithium-ion batteries (LiBs). This study was focused on hydrometallurgical recycling of LCMO type cathode batteries for the recovery of critical metals (lithium, cobalt, and manganese). The process involves sulfuric acid leaching in the presence of a reducing agent (H2O2) followed by the precipitation recovery of critical metals. The influential parameters like pulp density, H2SO4 concentration, H2O2 addition, agitation time, and temperature were optimized, yielding >98% leaching in 2.0 M H2SO4 with 4 vol.% of H2O2 at a moderate temperature of 50°C. Reaction kinetics revealed that the leaching was governed by the mixedcontrol process. Furthermore, the separation and recovery of metals from leach liquor was conducted by simple precipitation techniques, where KMnO4, C2H2O4, and Na2CO3 were used as precipitating reagents to recover MnO2, CoC2O4, and Li2CO3, respectively.