Parametric investigation and RSM optimization of DBD plasma methods (direct & indirect) for H₂S conversion in the air.

As stated earlier, to better investigate the effect of the indirect method on H 2 S conversion, a range of discharge power in which the amount of ozone production has an increasing trend (1-5w) was considered for the discharge power variable in the second design. 3.1.3 Effect of process parameters in H 2 S conversion As summarized in Table 4 , in the comparison of two direct and indirect methods for H 2 S conversion, A, B, C, D, E, AB, AD, AE, CE, DE, A 2 , B 2 , C 2 , ABC, ABE, ACE, BCE, A 2 B , A 2 E , AB 2 , B 2 E , D 2 E , and ABCE are identified as significant terms, while AC, BC, BD, BE, CD, and ACD play a weak role in the process, confirmed by the P -value ( Table S3 ).

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