Removal of Hg ⁰ from simulated flue gas over silver-loaded rice husk gasification char

Abstract

Mercury released into the atmosphere from coal combustion is harmful to humans and the environment. Rice husk gasification char (RHGC) is an industrial waste of biomass gasification power generation, which is silver-loaded to develop a novel and efficient sorbent for mercury removal from simulated flue gas. The experiment was carried out in a fixed-bed experimental system. The Hg0 adsorption performance of RHGC was improved significantly after loading silver. Hg0 adsorption capacity and mercury inlet concentration were found to be nonlinear. The adsorption capacity of RHGC decreased with the increase of reaction temperature. SO2 inhibited mercury removal, NO and HCl promoted mercury removal; the Hg0 adsorption capacity in the simulated flue gas was higher than that in pure N2. The silver-loaded rice husk gasification char (SRHGC) could be recycled about five times without significantly losing its removal efficiency. The SRHGC will not only reduce the cost of mercury removal but also save energy and reduce environmental pollution. At the same time, it provides a new way for the resource utilization of RHGC.

Green and Facile Synthesis of Porous SiO2@C Adsorbents from Rice Husk: Preparation, Characterization, and Their Application in Removal of Reactive Red 120 in Aqueous Solution

“…Here, the peak intensity of RH8-3 was the highest, demonstrating the high content of carbon, which agreed with EDX data. The peak at 63.92° considering crystalline SiO 2 could be found in RH8-1, RH8-2, and RH8-3 . However, it was not available in the XRD pattern of RH9-1, possibly due to its existence in an amorphous state or disappearance at high temperature.…”

“…For Si 2p ( Figure 5 c), peaks at 100.4 and 103.54 eV could be ascribed to Si–C and SiO 2 bonds, respectively, 49 whereas the peaks at 280.1, 284.09, 286.2, and 288.67 eV are attributed to C–Si, C–C, C–O, and C=O bonds, respectively ( Figure 5 d). 50 , 51 Finally, peaks at 531.87, 532.10, 533.3, and 537.1 eV are assigned to the bonds of C=O, SiO 2 , C–O, and satellite, respectively ( Figure 5 e). However, the data for Si 2p were too noisy to determine the existence of oxidized Si of RH8-3, which might be explained due to the low elemental percentage of Si within RH8-3 as exhibited in EDX data.…”

“…The peak at 63.92°c onsidering crystalline SiO 2 could be found in RH8-1, RH8-2, and RH8-3. 33 However, it was not available in the XRD pattern of RH9-1, possibly due to its existence in an amorphous state 34 or disappearance at high temperature. Figure 4b presents the N 2 adsorption−desorption isotherms of the four obtained materials.…”

A silicon particle-based courier promotes melatonin-mediated seed tolerance to nickel toxicity in rice

“…Amongst them, nanobiotechnology acts as a promising tool to effectively ameliorate stress adaption. 27,28,65 More and more NPs have been reported to commercially improve plant development and resistance under abiotic stress through direct applications or hydroponic application, like silver NPs, 66,67 iron NPs, 68 zinc oxide NPs, 69 copper NPs 70 and titanium oxide NPs. 29 Even more, silicon-based nanoparticles also work well in seedling growth 40 and seed germination.…”

Nanoparticles: Synthesis, Morphophysiological Effects, and Proteomic Responses of Crop Plants

“…The direct application of silver NPs reduced seedling biomass of wheat [83], zucchini [81], mung bean [83], and cabbage [84]; while it regulated the seedling growth in maize [84] and Vigna radiata [83]. The hydroponic applications of silver NPs enhanced root elongation in rice [85]; while it reduced in zucchini [81]. Changes in the morphological characteristics of treated plants depend on the types of NPs used.…”