Li Longxin, Sun Fei, Gao Jihui, Wang Lijie, Pi Xinxin, Zhao Guangbo
School of Energy Science and Engineering, Harbin Institute of Technology Harbin 150001 Heilongjiang China
RSC Adv. 2018 Apr 18;8(26):14488-14499. doi: 10.1039/c8ra02127a. eCollection 2018 Apr 17.
Aiming to overcome the limitations of the narrow pore size distributions of traditional activated carbon materials and to achieve wide adaptabilities towards large molecules adsorption, we herein demonstrate a new type of activated carbon with a broadened pore size distribution for high-rate and high-capacity aqueous dye molecule (Rhodamine B) adsorption. The preparation of CP-AC is achieved by a facile and one-step mineral-assisted chem-physical activation strategy from Chinese large-reserve Zhundong coal with ZnCl and CO as the activation agents. The method yields the activated carbon (CP-AC) that has a pore-size broadened hierarchical pore configuration with a high surface area and a large pore volume, favorably enabling a high-capacity Rhodamine B adsorption up to 881 mg g, which is among the highest levels of the reported activated carbons. A sonication-assisted adsorption test further demonstrates the high-rate adsorption capability of CP-AC with Rhodamine B adsorption capacity up to 842 mg g within 30 min (96% of the saturation capacity) while microporous activated carbon obtained by solely ZnCl activation could just achieve a capacity of 374 mg g within 30 min. In virtue of the low-cost resource materials and washing-free craft, this work offers a simple and green preparation strategy towards high-performance coal based activated carbons, holding great potentials for the industrial production and applications.
为了克服传统活性炭材料孔径分布狭窄的局限性，并实现对大分子吸附的广泛适应性，我们在此展示了一种新型活性炭，其具有拓宽的孔径分布，用于高速率和高容量的水性染料分子（罗丹明B）吸附。CP-AC的制备是通过一种简便的一步法矿物辅助化学物理活化策略，以中国储量丰富的准东煤为原料，以ZnCl和CO作为活化剂。该方法制备的活性炭（CP-AC）具有孔径拓宽的分级孔结构，具有高比表面积和大孔体积，有利于实现高达881 mg/g的高容量罗丹明B吸附，这是已报道的活性炭中最高水平之一。超声辅助吸附试验进一步证明了CP-AC的高速率吸附能力，在30分钟内对罗丹明B的吸附容量高达842 mg/g（饱和容量的96%），而仅通过ZnCl活化获得的微孔活性炭在30分钟内只能达到374 mg/g的容量。凭借低成本的原料和无需洗涤的工艺，这项工作为高性能煤基活性炭提供了一种简单且绿色的制备策略，在工业生产和应用方面具有巨大潜力。
