http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A Mannich base biosorbent derived from alkaline lignin for lead removal from aqueous solution
Yuanyuan Ge,Quanpeng Song,Zhili Li 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
A Mannich base biosorbent (AML) was prepared by grafting alkaline lignin (AL) with methylamine and formaldehyde. The effects of dosages, reaction time, pH and temperature of reaction on the nitrogen content of AML were investigated. A maximum nitrogen content of the Mannich base could reach to 8.32%. It was characterized by scanning electron microscopy (SEM), element analysis, and gel permeation chromatography (GPC). Kinetic adsorption suggested AML possessed fast adsorption for Pb2+ and followed a second-order model. Adsorption equilibrium results indicated AML had a maximum uptake of 60.5 mg/g for Pb2+ which was 4.2-fold higher than AL. The AML has good potential for cleanup of wastewater.
Study on Strain Energy Transfer and Efficiency in Spatial Micro-forming of Metal
Zhaojie Chen,Jin Xie,Quanpeng He,Dongsheng Ge,Kuo Lu,Chaolun Feng 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.11 No.2
In spatial micro-fabrication on metallic surface, the mechanical machining consumes material shear deformation energy, while the laser machining energy is greatly converted into material melting heat energy. In production, the micron-scale material-removal machining requires the CNC system to long-time tool path interpolation for high energy-consumption. According to dynamics and kinematics of metallic plastic deformation, a strain energy transfer is proposed to deform micro-topographic shapes by differentiated surface stress. The objective is to realize the precision forming of spatial microstructure surface through the strain energy conversion and conservation. First, the energy transfer and strain variations were modelled in relation to die curvature radius, workpiece thickness, initial microstructure angle and depth. Then, the strain energy consumption was investigated in relation to material properties, die movement, and micro dimensions. Finally, it was applied to industrial cold-pressing. It is shown that the strain energy of a single microstructure formation transfers from centre to outer part. The spatial microstructure forming may change from diversified strain stage to uniform strain state with the highest energy efficiency at a critical strain energy, while the surface roughness remains unchanged. Under the strain energy transfer, the microstructure shape changes with increasing energy consumption to a critical value. The metal compressive strength, die curvature radius and workpiece thickness promotes energy consumption, while descending velocity promotes processing efficiency. By controlling the energy conversion, the spatial microstructure sizes may be fabricated with an error of about 1.0% and the energy consumption of about 10 mm3/J. In industrial production, it contributes high energy efficiency without coolant pollutant in contrast to mechanical machining and laser machining. As a result, the strain energy conversion and conservation may be regarded as an evaluation for an eco-friendly micro-fabrication.
Yuanyuan Ge,Zhili Li,Yan Kong,Quanpeng Song,Kunqi Wang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Bi-functionalized lignin with amino and sulfonic groups (ASL) was synthesized via Mannich reaction andsulfomethylation. It was systematically characterized by FT-IR, element analysis, surface charge and XPS. Effects of initial pH, contact time and initial metal ion concentration on the adsorption of Cu(II) and Pb(II)onto ALS were studied. Results indicated that the biosorbent showed excellent performance for metalseven from low pH solutions. The adsorption kinetics and isotherms could be described well with Pseudosecond-order and D–R model, respectively. Further investigation of the metal-loaded ASL by FT-IR andXPS elucidated the amino and sulfonic groups reacted with metals in different way.