用碱改性生物炭从水溶液中去除铵

Q3 Chemical Engineering Chemical Speciation and Bioavailability Pub Date : 2016-02-05 DOI:10.1080/09542299.2016.1142833

Zhigang Liu, Yingwen Xue, Fei Gao, Xiaoru Cheng, Kai Yang

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引用次数: 37

摘要

摘要农用废渣转化生物炭可有效去除水中铵。本工作通过碱改性进一步提高了生物炭对铵盐的吸附能力。以农用废渣为原料，经NaOH溶液预处理，低温(300℃)慢热解制备了3种改性生物炭。改性后的生物炭在各种条件下均能有效去除水中的铵离子，吸附动力学较快(10 h内达到平衡)，吸附量极高(100 ~ 200 mg/g)。三种改性生物炭的Langmuir最大吸附容量均在313.9 ~ 518.9 mg/g之间，高于其他铵类吸附剂。虽然改性生物炭对铵的吸附受pH和温度的影响，但在所有测试条件下，铵的吸附都很高。本研究结果表明，碱改性生物炭可以作为一种替代吸附剂用于去除废水中的铵。

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Removal of ammonium from aqueous solutions using alkali-modified biochars

Abstract Biochars converted from agricultural residuals can effectively remove ammonium from water. This work further improved the sorption ability of biochars to aqueous ammonium through alkali modification. Three modified biochars were prepared from agricultural residuals pre-treated with NaOH solution through low-temperature (300 °C) slow pyrolysis. The modified biochars effectively removed ammonium ions from water under various conditions with relatively fast adsorption kinetics (reached equilibrium within 10 h) and extremely high adsorption capacity (>200 mg/g). The Langmuir maximum capacity of the three modified biochars were between 313.9 and 518.9 mg/g, higher than many other ammonium adsorbents. Although the sorption of ammonium onto the modified biochar was affected by pH and temperature, it was high under all of the tested conditions. Findings from this work indicated that alkali-modified biochars can be used as an alternative adsorbent for the removal of ammonium from wastewater.

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来源期刊

Chemical Speciation and Bioavailability 环境科学-毒理学

CiteScore

1.62

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： Chemical Speciation & Bioavailability ( CS&B) is a scholarly, peer-reviewed forum for insights on the chemical aspects of occurrence, distribution, transport, transformation, transfer, fate, and effects of substances in the environment and biota, and their impacts on the uptake of the substances by living organisms. Substances of interests include both beneficial and toxic ones, especially nutrients, heavy metals, persistent organic pollutants, and emerging contaminants, such as engineered nanomaterials, as well as pharmaceuticals and personal-care products as pollutants. It is the aim of this Journal to develop an international community of experienced colleagues to promote the research, discussion, review, and spread of information on chemical speciation and bioavailability, which is a topic of interest to researchers in many disciplines, including environmental, chemical, biological, food, medical, toxicology, and health sciences. Key themes in the scope of the Journal include, but are not limited to, the following “6Ms”: Methods for speciation analysis and the evaluation of bioavailability, especially the development, validation, and application of novel methods and techniques. Media that sustain the processes of release, distribution, transformation, and transfer of chemical speciation; of particular interest are emerging contaminants, such as engineered nanomaterials, pharmaceuticals, and personal-care products. Mobility of substance species in environment and biota, either spatially or temporally. Matters that influence the chemical speciation and bioavailability, mainly environmentally relevant conditions. Mechanisms that govern the transport, transformation, transfer, and fate of chemical speciation in the environment, and the biouptake of substances. Models for the simulation of chemical speciation and bioavailability, and for the prediction of toxicity. Chemical Speciation & Bioavailability is a fully open access journal. This means all submitted articles will, if accepted, be available for anyone to read, anywhere, at any time. immediately on publication. There are no charges for submission to this journal.