Effect of pH on hexavalent chromium removal driven by henna (Lawsonia inermis) fermentation

Huang, Jingang; Shi, Benyun; Han, Wei; Qiu, Shanshan; Li, Huanxuan; Hou, Pingzhi; Wu, Weihong; Tang, Junhong

doi:10.1016/j.bej.2020.107919

Cited by 5 publications

(1 citation statement)

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“…Henna plant (Lawsonia inermis) biomass (HPB) has been reported to be a natural source of lawsone (an effective RM), with lawsone comprising up to 1.8% of the plant's dry weight (Almeida et al 2012). Previous studies indicated that natural HPB, including stem, leaf, flower, and seed, could serve as both an electron donor and RM source to improve the bio-reduction of azo dyes and Cr(VI) in batch and continuous bioreactors, all showing positive effects of HPB on pollutants removal (Huang et al 2014(Huang et al , 2015(Huang et al , 2016a(Huang et al 2021Tang et al 2016;Rau et al 2002). Moreover, HPB could be co-fermented with waste sludge in municipal wastewater treatment plants and enhance the production of VFAs (Huang et al 2016b).…”

Section: Natural and Bio-resourced Redox Mediatormentioning

confidence: 99%

Environmental applications of immobilized and bio-resourced redox mediators: A Review

Guo

Huang

2022

BioRes

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Redox mediators (RMs), also known as electron shuttles, have been widely reported to promote both biotic and abiotic reductions of oxidized pollutants in water, soil, biogeochemical cycles, and wastewater treatment systems. However, the continuous addition of dissolved RMs is unaffordable and the potential environmental risks remain unknown because most applied RMs are synthetic chemicals. Immobilization technology enables RMs to be attached on non-dissolved supports, avoiding wash-out from the treatment systems. This realizes the reuse of RMs in scaled-up engineering applications and the in-situ remediation. Moreover, renewable natural biomass and their derivatives, such as biochar, have also aroused increased interest because they provide an economical and feasible way to solve the shortcomings of applying soluble RMs. This review presents different RM immobilization methods, which include entrapment, adsorption, and surface modification, as well as the use of bio-resourced RMs. The immobilization procedures and reaction mechanisms of the immobilized RMs and bio-resourced RMs in environmental applications are critically compared and summarized.

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