NiO-Modified Coconut Shell Based Activated Carbon Pretreated with KOH for the High-Efficiency Adsorption of NO at Ambient Temperature,Industrial & Engineering Chemistry Research

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NiO-Modified Coconut Shell Based Activated Carbon Pretreated with KOH for the High-Efficiency Adsorption of NO at Ambient Temperature
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-12-03 , DOI: 10.1021/acs.iecr.8b03209
Fengyu Gao _{1,

2} , Xiaolong Tang _{1,

2} , Honghong Yi _{1,

2} , Bowen Zhang ₁ , Shunzheng Zhao _{1,

2} , Jiangen Wang ₁ , Tian Gu ₁ , Yuhe Wang ₁

Affiliation

In this study, coconutshell-, coal-, and wood-based activated carbon were selected as the adsorbents for NO adsorption. KOH and transition metal oxides (CuO, FeO_x, and NiO) were further adopted to improve the NO removal efficiency and adsorption capacity at ambient temperature. The results showed that CSAC-KOH₍₃₎-NiO₍₁₀₎ adsorbents (coconut shell based activated carbon modified by 3% KOH and then 10% NiO) achieved the highest removal efficiency of NO (above 95.6%) and adsorption capacity (5.26 mg/g) within 60 min. XPS and NO-TPD results indicated that the increase of −C–O and OH–/O_x^– species might be the reasons for good removal efficiency of NO over CSAC-KOH, while the increase of OH-/O_x^– and lattice oxygen (O^2– in Ni–O) species is the reason for the CSAC-KOH-NiO sample. The medium sites of the active adsorbed oxygen (O_x^–) species and strong sites of lattice oxygen are the major adsorption sites on the surface of CSAC-KOH-NiO. The possible NO adsorption process were proposed that the main nitrite species (−NO₂) might be generated by lattice oxygen (O^2–) in Ni–O sites with the stimulation effects of active oxygen (O_x^– or/and [O]), while NO^– and – NO₃ species were generated from −C—C, −C═C, and −C═O sites.

中文翻译：

KOH预处理的NiO改性椰子壳基活性炭在环境温度下高效吸附NO

在这项研究中，以椰子壳，煤炭和木材为基础的活性炭被选作NO吸附的吸附剂。进一步采用KOH和过渡金属氧化物（CuO，FeO _x和NiO）来提高环境温度下的NO去除效率和吸附能力。结果表明，CSAC-KOH _（3） -NiO _（10）吸附剂（用3％KOH然后10％NiO改性的椰子壳基活性炭）实现了最高的NO去除效率（高于95.6％）和吸附能力（5.26）毫克/克）在60分钟内。XPS和NO-TPD结果表明，增加-C-O和OH- / O _X^-物种可能是NO的CSAC-KOH的去除效果良好的理由，而OH- / O的增加_X^-CSAC-KOH-NiO样品的原因是晶格中的氧（Ni-O中的O ^2–）。活性吸附的氧的介质站点（O _X^-）物种和晶格氧的强位点是CSAC-KOH氧化镍的表面上的主要吸附位点。提出了可能的NO吸附过程，即主要的亚硝酸盐物种（-NO ₂）可能是由Ni-O位点的晶格氧（O ^2–）产生，并具有活性氧（O _x^–或/和[O]的刺激作用）。），而^– C–C，–C═C和–C═O位产生了NO ^–和– NO ₃物种。

更新日期：2018-12-03

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