In this study, the effect of manganese sulfate (MnSO 4 ) on desulfurization capacity was investigated through carrying out consecutive desulfurization−regeneration cycles of MnO 2 -blended activated coke (Mn/AC). It was observed that MnSO 4 was produced on the surface of Mn/AC during the desulfurization process, and the amount of MnSO 4 accumulated on Mn/AC first increased significantly and then became relatively stable. In addition, the desulfurization results of MnSO 4 -impregnated Mn/AC indicate that Mn 2+ from MnSO 4 could form new liquid-phase catalysis, which existed with the solid-phase catalysis (blended MnO 2 ) simultaneously in the desulfurization system. However, an excessive amount of MnSO 4 over the surface of activated coke can block the access of SO 2 to the pore network, hampering the activity of the solid-phase catalyst and, consequently, resulting in a decrease of desulfurization capacity.

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In this work, an effective adsorbent for removing phosphate from aqueous solution was developed from modifying industrial waste--lithium silica fume (LSF). The characterization of LSF before and after modification was investigated using an N2 adsorption-desorption technique (Brunauer-Emmett-Teller, BET), scanning electron microscopy (SEM) and X-ray diffraction (XRD). Studies were conducted to investigate the effect of adsorbent dose, initial solution pH, contact time, phosphate concentration, and temperature on phosphate removal using this novel adsorbent. The specific surface area for modified LSF (LLSF) is 24.4024 m(2)/g, improved 69.8% compared with unmodified LSF. XRD result suggests that the lanthanum phosphate complex was formed on the surface of LLSF. The maximum phosphate adsorption capacity was 24.096 mg P/g for LLSF, and phosphate removal was favored in the pH range of 3-8. The kinetic data fitted pseudo-second-order kinetic equation, intra-particle diffusion was not the only rate controlling step. The adsorption isotherm results illustrated that the Langmuir model provided the best fit for the equilibrium data. The change in free energy (△G(0)), enthalpy (△H(0)) and entropy (△S(0)) revealed that the adsorption of phosphate on LLSF was spontaneous and endothermic. It was concluded that by modifying with lanthanum, LSF can be turned to be a highly efficient adsorbent in phosphate removal.

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