A novel magnetic porous sorbent obtained from agricultural waste rice husk was successfully synthesized through a simple carbon-thermal method. The sorbent was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, vibrating sample magnetometer, N2 sorption analysis, and X-ray photoelectron spectroscopy. The removal efficiency of the sorbent for Cr(VI) was also investigated. Chromium adsorption was fitted by the pseudo-second-order and Langmuir models. The maximum chromium adsorption capacity, Brunauer-Emmett-Teller surface area, and average Barrett-Joyner-Halenda pore size of the magnetic sorbent were 157.7mg·g-1, 134.1m2·g-1, and 4.99 nm, respectively. The saturated magnetization of the novel adsorbent was 77.8 emu·g.1, indicating that the material can facilitate separation and recovery from aqueous systems. The removal mechanisms of Cr(VI) were also discussed. The result illustrates that rice husk-derived magnetic carbonaceous materials are a potential adsorbent for Cr(VI) pollution treatment and provide a suitable method for the effective conversion of biomass waste, which may solve the problem of waste disposal and widen the applications of the materials.
Zhu XD, Liu YC, Zhou C, Luo G, Zhang SC, Chen JM, Carbon, 77, 627, 2014
Zhang LH, Sun Q, Liu DH, Lu AH, J. Mater. Chem. A, 1, 9477, 2013
Gu HB, Ding DW, Sameer P, Guo J, Yerra N, Huang YD, Luo ZP, Ho TC, Haldolaarachchige N, Young DP, Khasanov A, Guo ZH, Wei SY, ECS Solid State Letters, 2(12), M65, 2013
Zhu XD, Liu YC, Luo G, Qian F, Zhang SC, Chen JM, Environ. Sci. Technol., 48, 5840, 2014
Qiu B, Gu HB, Yan XR, Guo J, Wang YR, Sun DZ, Wang Q, Khan M, Zhang X, Weeks BL, Young DP, Guo ZH, Wei SY, J. Mater. Chem. A, 2, 17454, 2014