In this paper, the feasibility of preparing activated carbon from corncob furfural residue with ZnCl2 by microwave irradiation was studied. The effect of the ratio by weight of ZnCl2 to corncob furfural residue, ZnCl2 solution soaking time, microwave irradiation time and the pH value of ZnCl2 solution on the quality of activated carbon was investigated. On the condition that the microwave power is 800 W and ZnCl2 solution mass concentration is 50%, the best technological parameter on preparing activated carbon with ZnCl2 by microwave irradiation is obtained: at the ratio of 3.5:1 by weight of ZnCl2 to corncob furfural residue, microwave irradiation time is 20 min, ZnCl2 solution soaking time is 12 h, the pH value of ZnCl2 solution is 2, the activated carbon yield reached 33.1% and the decolorizing capacity for methylene blue is 202.5 mg/g, the product is used in treating Cr6+ solution(pH value 4.0, concentration 50 mg/L), its adsorption capacity of Cr6+ is 7.583 mg/g.

Cellulose crystalline and FTIR spectra ofArtocarpus heterophyllusLam wood and its main chemical compositions were analyzed.The result showed that the FTIR spectra of original wood samples fromArtocarpus heterophyllusLam wood present the same basic structure of all wood samples, the FTIR spectra of extracted wood samples were compared with the original wood sample, some of their absorption peaks of the band shifted to long or short wave, the wood and the solvent had little chemical reaction in the extracting process. FTIR spectra crystalline index of nitric acid-ethanol cellulose fromArtocarpus heterophyllusLam wood is NO′KI10.984, O′KI21.59, X-ray diffraction crystalline index of nitric acid-ethanol cellulose fromArtocarpus heterophyllusLam wood is 0.794.

The chemical compositions of Manihot esculenta crantz(M. utilissima Pohl)stalks were investigated, the contents of phenolic hydroxyl group and UV spectra of lignin were determined by ultraviolet-visible spectrophotometer. The result showed that the chemical compositions of Manihot esculenta crantz(M. utilissima Pohl)stalks were as follows: ashes 4.97%, cold water extraction 12.04%, hot water extraction 12.57%, 1% sodium hydroxide solution extraction 34.16%, benzene-alcohol solution extraction 4.20%, nitric acid-alcohol cellulose 35.86%, holo-cellulose 72.62%, pentosan 19.20%, acid-soluble lignin 2.51%, acid-insoluble lignin 26.10%, organic solvent-soluble lignin 1.07%, pectin content is 0.02%; it can be used as a non-wood renewable source of natural products.Phenolic hydroxyl content of organic solvent-soluble lignin and acid-insoluble lignin are 1.245 mmol·g-1 and 0.261mmol·g-1 respectively; the maximum absorption wavelength of organic solvent-soluble lignin and acid-soluble lignin in the UV region is near to 205 nm and 280 nm, but shifts to long wavelength or short wavelength with the nature of the different solvents.

The chemical compositions of Artocarpus heterophyllus Lam wood were investigated and content of trace elements in wood were determined. The result showed that the chemical compositions of Artocarpus heterophyllus Lam wood are as following: ashes 15.5 g•kg-1, cold water extraction 35.2 g•kg-1, hot water extraction 55.1 g•kg-1, 1%NaOH extraction 157.7 g•kg-1, benzene-alcohol extraction 79.2 g•kg-1, sodium nitrate-alcohol cellulose 467.6 g•kg-1, holo-cellulose 709.8 g•kg-1, pentosan 212.6 g•kg-1,Acid-soluble lignin 44.9 g•kg-1, Acid insoluble lignin 237.4 g•kg-1, Organic solvent soluble lignin 248.3g•kg-1, Phenolic hydroxyl content of organic solvent soluble lignin 0.25 mmol•g-1; the content of 12 trace elements in Artocarpus heterophyllus Lam wood are: Fe 959μg.g-1, Mn 9.37μg.g-1, Cu 5.60μg.g-1, Zn 17.1μg.g-1, Ca 2.26 mg.g -1, Mg 433μg.g-1, Na 28.1μg.g-1, K 1.05 mg.g-1, Al 46.2 μg.g-1, Pb 0.603 μg.g-1, Cd and Ni were not detected.