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- 저자 : Renmin Gong (검색결과 3 건)
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Soybean hull functionalized by phosphoric acid for sorption of copper from aqueous solution
Renmin Gong,Lingling Liu,Min Feng,Jiajing Zhao,Xingyan Liu,Shoujun Ni 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.2
One kind of potentially biodegradable cationic sorbent, which bears hydroxyl groups of phosphoric acid as its functional groups, with high sorption capacity of copper was prepared by thermochemically esterifying phosphoric acid (PA) onto soybean hull. Sorption of Cu(Ⅱ) from aqueous solution onto modified soybean hull (MSH) was investigated in a batch system. The sorption experiments were performed under various conditions such as different initial pH, copper concentration, MSH dosage, and contact time. The maximum copper sorption was obtained when initial solution pH≥3.5. The isothermal data of copper sorption fitted the Langmuir model and the sorption process could be described by the pseudo-first-order kinetic model. The maximum sorption capacity (Qm) of MSH for Cu(Ⅱ) was 31.55 mg/g. For 100 mg/l of Cu(Ⅱ) solution, a sorption ratio above 91% could be achieved by 5.0 g/l of MSH. The equilibrium of Cu(Ⅱ) sorption was reached within 50 min. The foreign cation and chelator in Cu(Ⅱ) solution caused decline of Cu(Ⅱ) sorption.
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Loofah sponge activated by periodate oxidation as a carrier for covalent immobilization of lipase
Renmin Gong,Jian Zhang,Jun Zhu,Jianting Wang,Qiumei Lai,Bo Jiang 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.8
Cellulose in loofah sponge was first oxidized by sodium periodate at positions 2 and 3 of anhydroglucose unit to introduce aldehyde groups, which were able to react with amino groups of lipase to form Schiff’s base, and result in loofah sponge immobilized lipase. The result of periodate oxidation was confirmed by determination of aldehyde group content and analysis of Fourier transform infrared spectra. The optimal pH for both free and immobilized lipases was approximately 7.5. The maximum activity of immobilized lipase was observed at 40 oC, while the free lipase exhibited maximum activity at 37 oC. The immobilized lipase presented improved thermal stability, storage stability, and reusability.
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Fenghong Huang,Renmin Gong,Na Li,Shoujun Ni,Pingzhen Guo 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.5
An ion exchanger with carboxyl groups as active sites was prepared by activating sawdust with epichlorohydrin,followed by coupling the epoxy-activated sawdust with aspartic acid. The optimal sorption condition, sorption capacity, kinetics and thermodynamics of basic dyes on sawdust ion exchanger (SIE) from aqueous solution were investigated in a batch system. Two basic dyes, methylene blue (MB) and crystal violet (CV), were selected as sorbates. The optimal pH value of MB and CV solutions for favorable sorption was pH 4 and above. The removal ratios of MB and CV on SIE increased with increasing sorbent dose but decreased with increasing dye concentration. The isothermal data of MB and CV sorbed on SIE correlated basically with the Langmuir model. The maximum sorption capacity (Qm) of SIE for MB and CV was 222.22 and 232.56 mg/g, respectively. The sorption equilibriums of MB and CV on SIE were reached at about 9 h, and the sorption processes could be described by the pseudo-second-order kinetic model. The thermodynamic study indicated that the sorptions of MB and CV on SIE were spontaneous and endothermic at the predetermined temperatures. High temperatures were favorable for the sorption processes.
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